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Old 05-01-2003, 05:42 PM   #1
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LT1 Wiring for dummies

Can a moderator please put a STICKY on this and lock it, people are sending me a ton of emails on this and I don't have time to reply to all so I figured this will be a greater help to people:

This will work for the 92-95 LT1s

If you wire the following correctly your car will start on the first attempt.



F-BODY LT1 ENGINE WIRING HARNESS.

VATS 16 pin PASSKEY II
|------------------------|
A8| [] [] [] [] [] [] [] []| A1
B8| [] [] [] [] [] [] [] []| B1
|------------------------|

Slot Wire Color Description
A1 Orn Power feed from ECM BAT fuse #4
A2 Pnk Power feed from ECM IGN fuse #5
A3 DK BLU Fuel enable signal
A4 YEL/BLK Starter enable relay control
A5 GRY "Security" indicator lamp control
B5 BLK/WHT Ground
B7 PPL/WHT Ignition key resistor return
B8 WHT/BLK Ignition key resistor feed

| | Top White 10 pin
|K|J|H|G|F|
|A|B|C|D|E|

K is DK GRN and is the coolant temperature feed to instrument cluster.
J is DK GRN/WHT and is fuel pump replay control
H is empty.
G is DK GRN/WHT and is vehicle speed signal.
F is GRY and is fuel pump motor feed.
A is RED and is Alternator feed to instrument cluster.
B is TAN and is oil pressure feed to instrument cluster.
C is BRN and is oil level feed to instrument cluster.
D is empty.
E is empty or if you have a manuel tranny it is the clutch anticipate signal and is GRY.

| | Top Blue 10 pin
|K|J|H|G|F|
|A|B|C|D|E|

K is TAN/BLK and is (Automatic) torque converter clutch control.
J is ORN/BLK and is (Automatic) park/neutral feed from transmission position switch.
NOTE: If this vehicle is manuel the wire would be LT GRN and would be (manuel) backup lamp feed.
H is LT BLU/BLK and is (Automatic) TCC switched power feed.
NOTE: If this vehicle is manuel the would be be BRN and be (manuel) power from turn B/U fuse # 2 to backup switch and would be brown.
G is PNK and power feed from ECM IGN fuse # 5
F is DK GRN/WHT and is A/C request signal
E is DK BLU and is theft deterrent - fuel enable feed.
D is WHT and is techometer signal to instrument cluster.
C is WHT/BLK and is diagnostic request signal.
B is service engine soon indicator feed.
A is empty.

Black Connector 4 pin
|A|B|C|D|
A is PPL and is ignition (crank starter) (connected to starter relay)
B is BLK/WHT Ground
C is ORN Power feed from ECM BAT fuse #4
D is Empty

C100. It's connected to the underhood fuse block.
|A|B|C|D|E|
|K|J|H|G|F|
| |
A is PNK and is power feed from injector fuse 9
B is DK GRN/WHT and is A/C compressor relay control
C is DK GRN and is A/C compressor clutch solenoid feed
D is TAN and is serial data signal.
E is BRN and is Air Pump Replay Control.(connected to AIR-PUMP solenoid relay)-->(RELAY CONNECTED TO BATTERY)
F is BRN and is power feed from FANS/SOLs Fuse 6
G is PNK and is power feed from ignition fuse 11
H is DK BLU and is secondary coolant fan relay control
J is DK and is primary fan replay control.
K is PNK and is power feed from injector fuse 10.


thx for you emails I'm happy that people are refered to me for answer, I just don't have enough time on my hands.
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Last edited by mat89RS; 05-01-2003 at 05:50 PM.
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Old 05-01-2003, 09:23 PM   #2
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Just thought I'd add this for Impala/Caprice LT1 under dash connectors.

Six wire connector
Cavity Color Use
A Red Goes to splice, then; IGN switch, Theft
deterrent relay, fuses-27,28,29,30,33,34
35
B Red Goes to splice, then, AC blower relay,
Circuit breaker-1,3,4 fuses 36,37,38,39,40
C Red Goes to splice, then, Headlight switch,
fuse 31
D ?
E Yellow Goes from starter solenoid to Theft
deterrent relay
F ?

Ten wire connector
Cavity Color
A Tan Goes to oil pressure gauge
B Dk Grn/Wh Goes to AC control (request AC)
C Brn From alternator to "check gauges" light
D Pink Change oil light
E Blk/Wh Low windshield fluid light
F Brn/Wh Low oil level light
G Wh ABS light
H ?
J Yel/Blk Low coolant light
K Dk Grn Goes to splice, then, IGN switch (bulb
test), temp gauge

37 wire connector
Cavity Color
A 1 Wh Goes to brake light switch (tells EBCM,
Electronic Brake Control Module, brakes
applied)
A2 Not used
A3 Dk Grn Goes to power antenna relay B
A4 Bare Called a "drain return" wraps rear wheel
speed sensor wires that go to Red 5
cavity connector
A5 Wh Goes to Red 5 cavity connector
A6 Not used
B1 Dk Blu Theft deterrent Module A3 "fuel enable
signal"
B2 Ppl Goes to Cruise control "release switch" D
B3 Yel For Police front flashing lamps
B4 Dk Grn/Wh Vehicle speed signal from PCM, goes to
splice, then, D8 of 56 cavity connector to
speedometer & C2 cavity 16 Radio;A5 of
Turn signal alert alarm in Convenience
Center, thru grommet to K of Cruise
Control Module.
B5 Wh Goes to Red 5 cavity connector
B6 Tan Goes to DLC (Data Link Connector) 9
C1 Pink Goes to splice, then IGN switch, fuses-
11,12,13,14,15
C2 Gray Goes thru grommet to fuel pump C
C3 Ppl Goes to wiper switch "HI" E
C4 Gray Goes to wiper switch "Wash" C
D1 Not used Buick Only
D2 Not used Buick Only
E1 Yel Goes to grommet, then Lt Frt wheel
speed sensor
F1 Bare Same as E1 above
F2 Lt Blu Same as E1 above
G1 Orn Goes to splice, then, IGN "Run", Circuit
breaker 2, fuses-16,17,18,20
G2 Pink Goes to wiper switch "Mist/Off" F
G3 Dk Grn Goes to wiper switch Off/Mist/Low/Hi" D
G4 Gray Goes to power antenna relay "UP" A
H1 Wh This tach signal (Impala only)
H2 Wh Goes to power antenna relay "Down" C
H3 Lt Blu For Police front flashing lamps
H4 Dk Grn For Police front flashing lamps
H5 Orn/Blk Goes to splice, Orn/Blk wire of Trunk
release relay, and Brake/Trans interlock
solenoid. It is "floating Grd, allows these
to operate IF in Park or Neutral
H6 Wh/Blk Grounds the following to an under hood
grd:Theft deterrent module B5, Cruise
Module E, Park/Neutral switch A,
J1-5 Not used
J6 Ppl Goes to DLC 2
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Old 05-04-2003, 12:43 AM   #3
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Going to leave this open, in case anyone has useful information to add... but please, lets keep the emails to a minimum even though he's the resident expert?
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Old 05-13-2003, 02:34 PM   #4
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Just thought I'd chime in here...Most of the wires necessary on the 3rd gen for this are easily accessed at the bulk head connector next to the brake booster on a 3rd gen. There you will find the gauge wiring. The tach wire is WHITE, the cranking/starter wire is PURPLE, the Voltage comes from the fat RED wires there that must have 12+volts at all times. There is also a thin BROWN wire that wires up to the Lt1 alternator BROWN wire. Oil pressure gauge wire is TAN. Coolant wire is DK GREEN. PINK is power ditribution wire. YELLOW/BLACK is low coolant probe if you are using a radiator or overflow bottle with one of these sensors. If you have a digital speedometer in your car, then there is a buffer box on the passnger side of the car(mine was yellow) that can be used for output from the PCM to input for the gauge(speedo). I can't remember what color the wire was there but it was either the second or third wire on the connector that makes the speedo work. If I remember anything else, I'll edit this. Feel free to email me as I always forget to check my PMs here. cpd004@hotmail.com
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Old 05-22-2003, 05:54 PM   #5
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LT1 PCM connections

Hey guys I may not know what I'm talking about here but the PCM on my 94 LT1 is not a 10 pin hookup for the blue or white connector or a 4 pin for the black. All 4 hookups are 32 pin connectors as I'm looking at my PCM right now. If theres is something I missed please correct me so I can get this right and get the motor in the car and wired correctly.
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Old 05-22-2003, 06:57 PM   #6
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Lt1cnqst...yes, all 4 connectors are 32 pin. By the way...what are you putting the Lt1 in...I just noticed your user name and I was wondering if it was a Conquest?

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Old 05-23-2003, 09:24 PM   #7
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10 pin to 32 pin

If the 94 PCM has four 32 pin connectors instead of 10 pin. Does anyone know what wires go where. Or if the ones listed in the sticky are the ones I need to use. How do I find them on a 32 pin PCM.
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Old 05-24-2003, 12:10 PM   #8
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Here is the bulk head connector.
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Old 05-24-2003, 12:19 PM   #9
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Wire colors and what they do...
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Old 05-24-2003, 12:23 PM   #10
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More...
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Old 06-30-2003, 05:46 PM   #11
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here's a little update folks, this is the pin layouts for 3rdgen gauges, this is very helpful when doing a swap.
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Old 06-30-2003, 05:46 PM   #12
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2.
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Old 07-17-2003, 01:45 PM   #13
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different wires???

EDIT: This is apparently a 1996 wiring harness, unfortunatly I can't say for sure if it is from a B, F, or Y body


I copied and pasted all the information here, printed it out, and headed off to my car expecting some nice easy splices....When I started trying to match wires that seemed relevant, I ran into a jam! The Blue and White connector listings didn't match my connectors. They were close, but not exact. I wrote down what I have, but forgot to bring it with me, I'll edit this post sometime after 5:00pm today with the colors. The one specific one I remember is the grey fuel pump wire on the white connector (F) if I remember correctly, didn't even have a wire at pin F, and no grey wires at all. This motor is from a 1995 Camaro, if someone has a helm from that year, could you post the info for these connectors?
Thanks

Edit: Ok here is what I have:

Edit: Ok, now more readable!
Guide for differences:
X=different
?=Not sure whats going on there maybe different, maybe omitted???
S=Strange, mainly because my harness should be an auto harness, I pulled the flexplate off the motor! lol but at certain places it seems like its a manual harness...


White Connector Different?
A Red Compared to A is RED
B Tan Compared to B is TAN
C Brown Compared to C is BRN
D Empty Compared to D is empty.
E Pink Compared to E is empty or GRY. X
F Empty Compared to F is GRY X
G Green/White Compared to G is DK GRN/WHT
H White Compared to H is empty. X
J Green/White Compared to J is DK GRN/WHT X
K Green Compared to DK GRN cluster

Blue Connector Different?
A Empty Compared to A is empty.
B Brown/White Compared to No Color Listed? ?
C White/Black Compared to C is WHT/BLK
D White Compared to D is WHT
E Blue Compared to E is DK BLU S
F Green/White Compared to F is DK GRN/WHT
G Empty Compared to G is PNK X
H Brown Compared to H is LT BLU/BLK or BRN S
J Green Compared to J is ORN/BLK or LT GRN S
K Purple Compared to K is TAN/BLK X


|A|B|C|D|
A is PPL
B is BLK/WHT
C is ORN
D is Empty


Black Connector 4 pin Different?
A Purple Compared to A is PPL
B Black/White Compared to B is BLK/WHT
C Orange Compared to C is ORN
D Red Compared to D is Empty X

please HELP

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Old 07-17-2003, 07:42 PM   #14
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I'll do my best at this to help. If you mean buy pinout on the pcm connector for the fuel pump wire being grey...I don't think thats where it should be. You need a grey wire coming off of the fuel pump relay to attach to the stock wiring of your 3rd gen car that goes back to the pump itself. I believe the color for the fuel pump before it gets to the relay coming out of the pcm is green/white. You would not have to tap in here at all.

This is what I can come up with for a 1995 Camaro:

A is RED PCM connector.
B is BLACK PCM connector.
C is GREY/CLEAR PCM connector.
D is BLUE PCM connector.

Unfortunately because I don't have the time, these will not be in order until I can get a chance to edit this post. It should help though.

Pinout Color Where it goes:

D20 wht/blk Output Field Service Enable.
D30 tan Serial Data
A2 blk/wht PCM Ground
C32 blk/wht PCM Ground
A18 tan/wht PCM Ground
D1 tan/wht PCM Ground
C25 yel ECT Sensor Signal
B6 blk TPS Ground
C22 dk blu TPS Sensor Signal
B28 gry 5v TPS Reference
D24 dk blu A/C Evaporative Temperature Sensor Signal
B29 gry MAP 5v Reference
C23 lt grn Map Sensor Signal
B16 blk MAP Ground
C21 tan IAT Sensor Signal
D12 red A/C Refrigerant Pressure Signal
A32 yel VSS Signal
A31 ppl VSS Ground
B8 dk grn/wht VSS Output
D22 dk blu Knock Sensor Signal
C19 tan/wht lt o2 Sensor ho2s LOW
C20 ppl/wht lt o2 Sensor ho2s HIGH
C7 tan rt o2 Sensor h02s LOW
C8 ppl rt o2 Sensor ho2s HIGH
B19 yel MAF Sensor Signal
A9 gry EGR Vacuum Control Signal Solenoid Valve Ctrl
D10 dk grn/wht EVAP Canister Purge Solenoid Valve Control
D6 lt grn Reverse Inhibit Solenoid Control
B13 gry Skip Shift Solenoid Control
B15 orn PCM Battery
B31 orn PCM Battery
B30 pnk PCM Ignition Feed
D30 pnk PCM Ignition Feed
A7 dk grn/wht Fuel Pump Relay Control
A3 blk Injector #1 Control
A4 lt blu/blk Injector #4 Control
A5 yel/blk Injector #6 Control
A6 red/blk Injector #7 Control
A19 lt grn/blk Injector #2 Control
A21 pnk/blk Injector #3 Control
A20 blk/wht Injector #5 Control
A22 dk blu/wht Injector #8 Control
B3 pnk/blk Distributor Reference Low Signal
B14 red Distributor Ignition Feed
B20 ppl/wht OR lt blu/blk High Resolution Signal
B2 red/blk Low Resolution Signal
B5 wht Ignition Control
A14 brn Air Pump Relay Control
A13 wht TACH Output
C13 lt blu Performance Mode Switch Signal
A15 dk blu Performance Mode Indicator Lamp Control
A12 tan/blk Electronic Brake & Traction Control Module
A23 orn/blk Electronic Brake & Traction Control Module
C11 lt blu Electronic Brake & Traction Control Module
A25 dk blu Fuel Enable Signal(Theft Detterant System)
D9 brn/wht Malfunction Indicator Lamp
D15 wht Skip Shift Lamp Control(T56/T5 ONLY)
C1 lt blu/wht IAC Coil
C2 lt blu/blk IAC Coil
C6 lt grn/wht IAC Coil
C5 lt grn/blk IAC Coil
C15 orn/blk Park Nuetral Position Sensor(4L60E ONLY)
B1 dk grn/wht A/C Request Signal
D8 dk grn/wht A/C Clutch Relay Control
B21 dk grn A/C Clutch Status
B6 blk A/C Refrigerant Pressure Sensor
D12 red/blk A/C Refrigerant Pressure Sensor
B28 gry A/C Refrigerant Pressure Sensor
D24 dk blu A/C Evaporative Temperature Sensor
B6 blk A/C Evaporative Temperature Sensor
A11 dk grn Cooling Fan Relay Control
A10 dk blu Secondary Cooling Fan Relay Control
C14 lt blu/blk Brake Signal
D11 tan/blk Torque Convertor Clutch Solenoid
D6 brn Torque Convertor Clutch Solenoid
B13 wht Control Solenoid
B7 lt grn 1-2 Shift Solenoid Control
B12 yel/blk 2-3 Shift Solenoid Control
D2 lt blu/wht Pressure Control Solenoid
C16 red/blk Pressure Control Solenoid
C28 pnk Trans Fluid Temperature Sensor
C29 dk blu Trans Fluid Temperature Sensor
C30 red Trans Fluid Temperature Sensor
D28 yel/blk Trans Fluid Temperature Sensor
B6 blk Trans Fluid Temperature Sensor
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Old 07-18-2003, 01:54 AM   #15
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I'm not sure what all that is. I do have the c100 connector pinout for my car (Thank goodness for the helm!!!!!, Wish I had one for the '95......I might go down to the dealer and get photocopies )



I guess the most appropriate question for a guide would be which wires need splicing, which can be eliminated/ignored. I am quite capable of figuring it all out, but I don't know if I can get enough figured out before Tuesday of next week, which is when the car has to be running (I'd say tight schedules suck, but I have been working on this for 2+ months now...lol, its just crunch time now)

While I am here posting, this may be a dumb question, but hell, I'll shoot, Does the maf for this car haf power and burnoff relays? Will the thirdgen ones work? Connector wire colors would be a plus lol

I think with all that I could very easily have the beast up and running this weekend!

and Trans Am #5 thanks for all the help so far, I really do appreciate it. Without the help I get from people like you from this site, and a few others *cough*NTTGA!*cough*, most of what I have done/learned would not have been possible. I do understand busy schedules, and I know I really should have the helm for this motor, but its too late for that. Back to topic, thanks



EDIT: Ok looking back...wow, colors for the whole harness???? Thats what it looks like, I got a few more minutes, so I'll try and sift a little Ahhhh, got it, off the PCM itself, wow though, what a pain tracing wires like that, I kinda hoped the helm for the car would have the connectors and pinouts like mine has for the 87. Unfortunatly, I don't know the letter/number designation for those connectors....

Last edited by Corry; 07-18-2003 at 01:58 AM.
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Old 07-18-2003, 10:31 AM   #16
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You're welcome...There are going to be wires that can be eliminated but should be done so only after the car actaually runs. That way you can make sure you haven't missed anything.
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Old 07-18-2003, 10:50 AM   #17
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Check this link out for schematics for a 1995 Z28. These should clear up some issues as well. http://www.thirdgenfbodies.com/forum...?showtopic=436

These are for a 1995 Z28. The link will take you to another site where I was able to add larger pics of the pages from the manual.
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Old 07-18-2003, 05:55 PM   #18
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Thats some good info, however, it still doesn't appear to be what I need. At least, I dont think it is.
My concern is this: I have many wires w/o plugs on the 4th gen wiring harness. Some of them I can see I will have to splice into the C100 connector, and spend a whole lot of time with a continuity testor on a DMM to figure out which wires actually go to those connectors. I can accept that, although, I'd rather not. What really bugs me is I know my old motor had injector fuses, and I have seen references to them on the new motor, but there are no provisions for hooking up the old fuses to the new wiring harness, and more, I don't even know where to connect them in the circuit. I am sure there are more, and once I find those, the rest of the missing "links" will probably be right around the connector for the injector fuses.
Right now, I see only 3 things I can do.
1 Get the *^&^$&^($& under-hood fusebox
2 Run wires from inside my car's under-dash fusebox to the firewall (what a waste of copper/PITA
3 insert fuses where necessary, very ugly and still a PITA.

Is there something I am missing?
Just to give you and indea of what I am up against, I have these 4 connectors or so that need homes/splices
Click the image to open in full size.
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This is why I am concerned....
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Old 07-21-2003, 08:44 AM   #19
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Ok people, I went to a dealer and scanned some stuff from the service manual. I missed one connector because I remembered it's number of pins wrong, but I did get the wiring diagram/schematic of where its wires go. If someone has access to the servie manual, you should be able to see the page numbers of where the c100, c220, and c230 connectors are, and therefore it should be a cinch to scan the last connector and post it.


I will not be able to host these for long so grab them now and hang onto them for people with future problems!!!!



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Old 11-10-2003, 03:36 PM   #20
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Is it hard to repin your harness/connectors? If I use this thread, how long will it take to do all of the wiring/electrical stuff? Also, what parts should I get from the donor car, here's what I've got:

-Engine
-Main harness
-Computer
-Sensors
What else?

-Rippin
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Old 11-13-2003, 05:17 PM   #21
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Doable in about an hour or two if you follow the wiring correctly.
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Old 02-27-2004, 12:14 AM   #22
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Engine swap-Help Needed

I am doing a swap from a 94 LT1 (Vette) into a 85 Iroc Z28 camaro!
Help Please
This will work for the 92-95 LT1s
If you wire the following correctly your car will start on the first attempt.
F-BODY LT1 ENGINE WIRING HARNESS.

This post above is the factory wiring harness the same as the 94 vett LT1?
I dont have to modify the cross member with this engine right?
I need hedders, high volume fuel pump,and what else?
Does this engine have VSS, maf,the VAT I here about?
How do I work with all this?Can I bypass the VAT?
Hey camaro gu-ru's I really need help here, sooo please all the help you can give will be greatly appreciated.
I need a working swap guide, all the ones I have seen are incomplete.

Can some one write me and tell me all they had to do for this swap, pretty Please. My Email is corey.d.miller@us.army.mil
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Old 03-21-2004, 07:27 PM   #23
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Just curious, the VATS 16 pin connector thats listed first on the how-to, does anyone have a picture of this connector? the blue, black, white connectors are easy shots, but I'm not seeing hte VATS connector...

ty
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Old 03-22-2004, 11:31 PM   #24
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computer pin outs 1994 LT1 Vette

Hey I found these on the computer pin outs, heres the pic as an attachment, if they are allowed to be on here via the web site guys.
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Old 03-25-2004, 12:11 AM   #25
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Hey mat question would i be able to use a stock shifter and cable with the 4l60e trans? (that's the cable for p r n d 2 1)
also do you have any pics of your car i'd like to check it out thanks
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Old 04-23-2004, 09:03 AM   #26
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Thanks for the scans Corry, they also help w/L36 swaps

You da MAN!!!!!!!!!!

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Old 04-23-2004, 07:30 PM   #27
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Hey I just wanted every one here to know that I have gotten the LT1 from a 94 vette installed in my 85 Iroc, and I used the factory vette wiring harness!
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Old 07-25-2004, 08:53 PM   #28
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I started the wiring today and found out that if you have the old harness, and new harness, and both the service manuals there....It's not that hard to figure out! Trans Am #5 was very helpful in which wires to splice coming out of the C100 connector, and I was able to find what they go to, and match them up with the LT1 wires fairly easily.
One thing, on the LT1 harness, the 3 connectors that Corry posted schematics for go into the 4th gen car and connect to the Instrument Panel. You can find the wires for the Tach, Speedo, and Engine Coolant Temp sensor there.
I don't know about ya'll, but there was a tan wire coming from my C100 connector that has a connector that hooks up directly to the oil pressure sensor on the left rear of the LT1 block. (That's how I hope to read the oil pressure) Also, for the LT1 alternator, I just cut the old connector off, and used the 3-wire one from my 305 TBI, and plan on wiring that up.
Hopefully this helps some people, I'll try to post more helpful info as my swap progresses!
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Old 07-25-2004, 08:59 PM   #29
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I started the wiring today and found out that if you have the old harness, and new harness, and both the service manuals there....It's not that hard to figure out! Trans Am #5 was very helpful in which wires to splice coming out of the C100 connector, and I was able to find what they go to, and match them up with the LT1 wires fairly easily.
One thing, on the LT1 harness, the 3 connectors that Corry posted schematics for go into the 4th gen car and connect to the Instrument Panel. You can find the wires for the Tach, Speedo, and Engine Coolant Temp sensor there.
I don't know about ya'll, but there was a tan wire coming from my C100 connector that has a connector that hooks up directly to the oil pressure sensor on the left rear of the LT1 block. (That's how I hope to read the oil pressure) Also, for the LT1 alternator, I just cut the old connector off, and used the 3-wire one from my 305 TBI, and plan on wiring that up.
Hopefully this helps some people, I'll try to post more helpful info as my swap progresses!
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Old 07-26-2004, 10:30 AM   #30
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Glad it was useful for ya tamatt27.
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Old 08-04-2004, 11:36 PM   #31
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I was curious if anybody has done this using a caprice LT1 harness yet? The 8th letter of the VIN on my car (86 IROC, formerly a TPI 305 car) is F if that helps (far as I know it was a 305 TPI car).

I do plan to pickup an FSM for the car, but I haven't yet, and I want to try to get the LT1 harness wired into the camaro as soon as I can. I am using an LT1 harness from a 95 caprice as my starting point, and I do have an FSM for that platform.

Also, on the diagram of the camaro C100 connector, F8 is brown and connects to the charging system, and it was said above that it connects to the LT1's brown alternator wire. My LT1 alternator plug has 2 wires and they're both brown, so I'm not sure which to connect it to. Any advice? I can trace them back through that harness, thats no problem at all, should I look for the one that goes to the firewall, or do they both? I assume one controls the alternator and the other runs the voltage gauge in the dash?

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Old 08-05-2004, 01:35 AM   #32
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whats up Mike454SS. my car had a 305 tpi and i wasn't getting any kind of charge with just the brown wire of the lt1 harness. what i did with mine was i used the old connecter off my alternater (305 tpi) and spliced it to the brown wire and the red wire to starter.
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Old 08-05-2004, 04:31 PM   #33
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Quote:
Originally posted by z91bowtie1
whats up Mike454SS. my car had a 305 tpi and i wasn't getting any kind of charge with just the brown wire of the lt1 harness. what i did with mine was i used the old connecter off my alternater (305 tpi) and spliced it to the brown wire and the red wire to starter.
That's what I did., Just use the 3rd gen alt connector, and splice it into the 4th gen harness.
On my LT1, '94 Z28, there was one thin red wire, and my TBI alt. connector had 3. I can't remember what I hooked th other 3 up to, I'll look when I get home though.
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Old 08-06-2004, 12:18 AM   #34
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I don't have the stock TPI harness...previous owner took about half of the engine wiring...but he didn't cut anything, he just unplugged what was on top of the engine itself.

Also curious...how did you guys hook up the check engine light? Did I read right past it do I need to run a new wire through the bulkhead? Something to do when I wire up the ALDL?

Maybe I should just get a 730 harness and ECM and run a different engine in this car.

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Old 08-08-2004, 12:41 PM   #35
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About the check engine light, it shouldn't be that hard. Just find the wire coming out of the LT1 computer that's for the check engine light, and wire it up to the wire for the thirdgen check engine light. I don't know how to wire up the ALDL...not at that part yet. Maybe someone else will chime in and help us both out...
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Old 08-11-2004, 02:31 AM   #36
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tamatt27
the way i have my aldl connected is i ran the tan wire from the c105 threw the fire wall and spliced it to the orange wire on my aldl. and also the ground.
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Old 08-29-2004, 03:22 PM   #37
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For those of you with MSD ignitions.,...where do i hook up the wires to? More importantly, the crank trigger/timing wire??
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Old 08-30-2004, 07:35 PM   #38
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whats the c 105 connector for?? mines missing.
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Old 08-30-2004, 07:41 PM   #39
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heres the pic of it circled
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Old 09-10-2004, 11:51 PM   #40
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hey guys questions

Quote:
J is DK GRN/WHT and is fuel pump replay control
does that go into the fuel pump relay on my thirdgen were gr/wh wire is already from third gen harness?? im confused on the relay situation..what do we have to do as far as they go?
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Old 09-17-2004, 05:55 PM   #41
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hey guys i hope some poeple are still watching this. i have a problim. on the first post were some slots say that they are empty there is wires on mine. im running a manual and if from what i understand from above they are for auto performance shifting stuff??? someone please chime in.
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Old 09-29-2004, 04:36 PM   #42
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Click the image to open in full size.

where in this pic does all the 3rd gen stuff splice in?

*edit* I duno whats wrong but it refuses to show the pic when i do the [img][/img] thing
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Old 09-29-2004, 08:27 PM   #43
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all the wires splice into were the circles are around. just go by the original 1st post and its easy.
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Old 10-11-2004, 07:43 PM   #44
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Buick Harness

http://www.theherd.com/articles/tach.html

these instructions should help anyone using a buick Harness for their swap. Tach hookup
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Old 10-12-2004, 02:14 AM   #45
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Quote:
Originally posted by Trans Am#5
I'll do my best at this to help. If you mean buy pinout on the pcm connector for the fuel pump wire being grey...I don't think thats where it should be. You need a grey wire coming off of the fuel pump relay to attach to the stock wiring of your 3rd gen car that goes back to the pump itself. I believe the color for the fuel pump before it gets to the relay coming out of the pcm is green/white. You would not have to tap in here at all.

sorted, looks like a few pinouts share the same number ... oh well

A is RED PCM connector.
B is BLACK PCM connector.
C is GREY/CLEAR PCM connector.
D is BLUE PCM connector.

Pinout Color Where it goes:

A2 blk/wht PCM Ground
A3 blk Injector #1 Control
A4 lt blu/blk Injector #4 Control
A5 yel/blk Injector #6 Control
A6 red/blk Injector #7 Control
A7 dk grn/wht Fuel Pump Relay Control
A9 gry EGR Vacuum Control Signal Solenoid Valve Ctrl
A10 dk blu Secondary Cooling Fan Relay Control
A11 dk grn Cooling Fan Relay Control
A12 tan/blk Electronic Brake & Traction Control Module
A13 wht TACH Output
A14 brn Air Pump Relay Control
A15 dk blu Performance Mode Indicator Lamp Control
A18 tan/wht PCM Ground
A19 lt grn/blk Injector #2 Control
A20 blk/wht Injector #5 Control
A21 pnk/blk Injector #3 Control
A22 dk blu/wht Injector #8 Control
A23 orn/blk Electronic Brake & Traction Control Module
A25 dk blu Fuel Enable Signal(Theft Detterant System)
A31 ppl VSS Ground
A32 yel VSS Signal
B1 dk grn/wht A/C Request Signal
B2 red/blk Low Resolution Signal
B3 pnk/blk Distributor Reference Low Signal
B5 wht Ignition Control
B6 blk A/C Evaporative Temperature Sensor
B6 blk A/C Refrigerant Pressure Sensor
B6 blk TPS Ground
B6 blk Trans Fluid Temperature Sensor
B7 lt grn 1-2 Shift Solenoid Control
B8 dk grn/wht VSS Output
B12 yel/blk 2-3 Shift Solenoid Control
B13 gry Skip Shift Solenoid Control
B13 wht Control Solenoid
B14 red Distributor Ignition Feed
B15 orn PCM Battery
B16 blk MAP Ground
B19 yel MAF Sensor Signal
B20 ppl/wht OR lt blu/blk High Resolution Signal
B21 dk grn A/C Clutch Status
B28 gry 5v TPS Reference
B28 gry A/C Refrigerant Pressure Sensor
B29 gry MAP 5v Reference
B30 pnk PCM Ignition Feed
B31 orn PCM Battery
C1 lt blu/wht IAC Coil
C2 lt blu/blk IAC Coil
C5 lt grn/blk IAC Coil
C6 lt grn/wht IAC Coil
C7 tan rt o2 Sensor h02s LOW
C8 ppl rt o2 Sensor ho2s HIGH
C11 lt blu Electronic Brake & Traction Control Module
C13 lt blu Performance Mode Switch Signal
C14 lt blu/blk Brake Signal
C15 orn/blk Park Nuetral Position Sensor(4L60E ONLY)
C16 red/blk Pressure Control Solenoid
C19 tan/wht lt o2 Sensor ho2s LOW
C20 ppl/wht lt o2 Sensor ho2s HIGH
C21 tan IAT Sensor Signal
C22 dk blu TPS Sensor Signal
C23 lt grn Map Sensor Signal
C25 yel ECT Sensor Signal
C28 pnk Trans Fluid Temperature Sensor
C29 dk blu Trans Fluid Temperature Sensor
C30 red Trans Fluid Temperature Sensor
C32 blk/wht PCM Ground
D1 tan/wht PCM Ground
D2 lt blu/wht Pressure Control Solenoid
D6 brn Torque Convertor Clutch Solenoid
D6 lt grn Reverse Inhibit Solenoid Control
D8 dk grn/wht A/C Clutch Relay Control
D9 brn/wht Malfunction Indicator Lamp
D10 dk grn/wht EVAP Canister Purge Solenoid Valve Control
D11 tan/blk Torque Convertor Clutch Solenoid
D12 red A/C Refrigerant Pressure Signal
D12 red/blk A/C Refrigerant Pressure Sensor
D15 wht Skip Shift Lamp Control(T56/T5 ONLY)
D20 wht/blk Output Field Service Enable.
D22 dk blu Knock Sensor Signal
D24 dk blu A/C Evaporative Temperature Sensor
D24 dk blu A/C Evaporative Temperature Sensor Signal
D28 yel/blk Trans Fluid Temperature Sensor
D30 pnk PCM Ignition Feed
D30 tan Serial Data
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Old 12-14-2004, 01:20 PM   #46
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official 94-95 PCM connector diagrams...

Red:
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Old 12-14-2004, 01:20 PM   #47
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Black:
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91 RS Camaro | 383 LT1/T-56
Stage III ported heads | CC306 Cam | Electric Waterpump
1.6:1 Rocker Arms | SLP headers | 3" Exhaust
Forged Rotating assembly | Whole lot of *** woopin!
Best time (with stock cam on the old 350): 60' 2.396 - 13.733 @ 107.48 MPH
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Old 12-14-2004, 01:21 PM   #48
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Gray/Clear:
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91 RS Camaro | 383 LT1/T-56
Stage III ported heads | CC306 Cam | Electric Waterpump
1.6:1 Rocker Arms | SLP headers | 3" Exhaust
Forged Rotating assembly | Whole lot of *** woopin!
Best time (with stock cam on the old 350): 60' 2.396 - 13.733 @ 107.48 MPH
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Old 12-14-2004, 01:22 PM   #49
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Blue:
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Stage III ported heads | CC306 Cam | Electric Waterpump
1.6:1 Rocker Arms | SLP headers | 3" Exhaust
Forged Rotating assembly | Whole lot of *** woopin!
Best time (with stock cam on the old 350): 60' 2.396 - 13.733 @ 107.48 MPH
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Old 03-06-2005, 05:09 PM   #50
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ok guys i pinted out all the wiring diagrams and the only problem i am running into is the harness was sent off and had a data cable installed so i can runn the lt1 edit . and they cut off the c100 conector and the othere one i think it is the . my question is i have read this post manny times and still am confused. the wires from the c100 of the lt1 harnes are the only thing i need to hook up right. minus the vats eliminator box. and i just plug in the vss plug to my 700r4 and the speedo should work right. I was also told by someone that i could use the lt1 tranny plug to hook up my torque lock up. i just need to know the 3 wires that match my 92 harness? i know that is pretty confusing and im sorry i am just trying to figure this all out. I know you all say it should be real easy but in trying to figure it out. thank sean
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