LT1 Wiring for dummies
Joined: Sep 2004
Posts: 5,906
Likes: 240
From: Chicagoland Suburbs
Car: 1989 Trans Am GTA
Engine: LT1, AFR 195cc, 231/239 LE cam.
Transmission: M28 T56
Axle/Gears: 3.23 10bolt waiting to explode.
Re: LT1 Wiring for dummies
but my harness came with a new driver side firewall connector.
Junior Member
Joined: Dec 2009
Posts: 64
Likes: 0
Re: LT1 Wiring for dummies
but hooking my guadges up im gona have to look at this form to see what goes where. but when i have those hooked up shouldnt my speedo and RPM work just fine?
Joined: Sep 2004
Posts: 5,906
Likes: 240
From: Chicagoland Suburbs
Car: 1989 Trans Am GTA
Engine: LT1, AFR 195cc, 231/239 LE cam.
Transmission: M28 T56
Axle/Gears: 3.23 10bolt waiting to explode.
Re: LT1 Wiring for dummies
ahh ok. when i get a harness im gona pull one, because ill be able to label where everything goes as it comes out, i feel itll be alot easier for me.
but hooking my gauges up im gona have to look at this form to see what goes where. but when i have those hooked up shouldnt my speedo and RPM work just fine?
but hooking my gauges up im gona have to look at this form to see what goes where. but when i have those hooked up shouldnt my speedo and RPM work just fine?
With a T56 a converter is needed to convert the speedo signal into something the gauge can handle.
Its all there, most of it in this thread.
Junior Member
Joined: Dec 2009
Posts: 64
Likes: 0
Re: LT1 Wiring for dummies
okay thanks. all i really wanted was to clarrify that all i really needed was the engine, computer, and wiring harness. thanks.
Junior Member
iTrader: (5)
Joined: Nov 2007
Posts: 68
Likes: 0
From: Hallandale Beach
Car: 91 camaro
Engine: LS3
Transmission: T-56
Re: LT1 Wiring for dummies
all your gonna use it the lt1 compiuter and engine harness, everything you need to know is under the engine swap thread..just check it out thats how i figured everything out
Junior Member
Joined: Sep 2010
Posts: 2
Likes: 0
Car: 85' iroc-z
Engine: 98 LT1, if all goes well
Re: LT1 Wiring for dummies
where can i find a "plug and play" wiring harness to put 95 LT1 in my 85 iroc? have the engine, tranny, computer and harness with the motor i bought.
Member
Joined: Mar 2007
Posts: 185
Likes: 0
From: Slinger WI
Car: 55 chevy Belair & 86IROC Z
Engine: 350 in 55 86IROC Z LT1
Transmission: 55 4speed IROC Z4L60e
Axle/Gears: 12 bolt 410 in55 and 342 inCamaro
Re: LT1 Wiring for dummies
Joined: Sep 2004
Posts: 5,906
Likes: 240
From: Chicagoland Suburbs
Car: 1989 Trans Am GTA
Engine: LT1, AFR 195cc, 231/239 LE cam.
Transmission: M28 T56
Axle/Gears: 3.23 10bolt waiting to explode.
Junior Member
iTrader: (5)
Joined: Nov 2007
Posts: 68
Likes: 0
From: Hallandale Beach
Car: 91 camaro
Engine: LS3
Transmission: T-56
Re: LT1 Wiring for dummies
pianless harness is the best way...took me 4 hours to wire everything and get it running...also now you have a new engine harness dont have to deal with old wires that can give you problems...my car starts up everytime no problems
Member
Joined: Mar 2007
Posts: 185
Likes: 0
From: Slinger WI
Car: 55 chevy Belair & 86IROC Z
Engine: 350 in 55 86IROC Z LT1
Transmission: 55 4speed IROC Z4L60e
Axle/Gears: 12 bolt 410 in55 and 342 inCamaro
Re: LT1 Wiring for dummies
what the price of the painless wire harness ??that what I have in my 55 chevy paid like $150 about ten year ago but the Lt1 Painless wire harness I think its like $850.00 which seem steep what is the price for a Painless Lt1 wire harnes my plan was to have AC in my 86 IROC Z let know what you find out thanks
Member
Joined: Mar 2007
Posts: 185
Likes: 0
From: Slinger WI
Car: 55 chevy Belair & 86IROC Z
Engine: 350 in 55 86IROC Z LT1
Transmission: 55 4speed IROC Z4L60e
Axle/Gears: 12 bolt 410 in55 and 342 inCamaro
Re: LT1 Wiring for dummies
what did you for the painless wire harnes from where did you get your ?thanks
Member
Joined: Mar 2007
Posts: 185
Likes: 0
From: Slinger WI
Car: 55 chevy Belair & 86IROC Z
Engine: 350 in 55 86IROC Z LT1
Transmission: 55 4speed IROC Z4L60e
Axle/Gears: 12 bolt 410 in55 and 342 inCamaro
Re: LT1 Wiring for dummies
I found the painless wire #60502 at Summit for $686 plus shipping that about the going price and still steep same at Jegs another place wanted ( $989.99
Member
Joined: Mar 2007
Posts: 185
Likes: 0
From: Slinger WI
Car: 55 chevy Belair & 86IROC Z
Engine: 350 in 55 86IROC Z LT1
Transmission: 55 4speed IROC Z4L60e
Axle/Gears: 12 bolt 410 in55 and 342 inCamaro
Re: LT1 Wiring for dummies
your right $686 for a painless 60502 wire harness is NUTs gone are they days when HOT RODDING didn't cost an arm and a leg there also a place that called Currant they want's $619 for there harnes still too high
Joined: May 2004
Posts: 1,037
Likes: 2
From: Kingsport Tenn
Car: 1992 camaro
Engine: LT1
Transmission: 4L60E
Axle/Gears: 3:73
Re: LT1 Wiring for dummies
You all should trying to pm Pocket he sells and makes harness for the LT1 swap ALOT cheaper than the painless. It's really not that hard if you have both harness.
Re: LT1 Wiring for dummies
If by cheaper you mean double, sure
Your '55 would have used a generic X circuit harness centered around the fuseblock. Basic tail lights, headlights, carb distributor etc. EFI harnesses are more expensive because they use about 4x the amount of wire (copper is expensive) and 20x the connectors ($8-18 ea adds up). Dont forget, each companies definition of "plug and play" is different. To do a LTx/LSx swap in something like your '55, you'd need the basic harness first, then their "P&P" piece. For a 3rd gen you'll still have to use some sort of stock engine harness to get the basic power, IGN, gauges, fuses, relays etc connected. You cant simply use a painless harness out of the box and expect anything to happen
What is P102? Take a pic
what the price of the painless wire harness ??that what I have in my 55 chevy paid like $150 about ten year ago but the Lt1 Painless wire harness I think its like $850.00 which seem steep what is the price for a Painless Lt1 wire harnes my plan was to have AC in my 86 IROC Z let know what you find out thanks
What is P102? Take a pic
Junior Member
Joined: Jan 2009
Posts: 58
Likes: 0
From: Rockford, Il
Car: 91 Z28 Convertible Camaro
Engine: LT1
Transmission: 4L60E
Axle/Gears: Borg-warner 3:27 gears
Re: LT1 Wiring for dummies
ok guys im really in need of somehelp, every were i read the diagrams cover up 95 does anyone have one for a 96 z28 lt1? or is it thet same as the 93-95?
i have spent alot of time reading through the form and over and over again through the stickys, but hot damn im confussed...lol
anyone with some help will be great.
Thanks
i have spent alot of time reading through the form and over and over again through the stickys, but hot damn im confussed...lol
anyone with some help will be great.
Thanks
Re: LT1 Wiring for dummies
http://www.lt1swap.com/wiringharness.htm
Put your confusion aside and make a punch list of the swap and how you're doing each phase. Itll take alot of guesswork out so you can focus on the important aspects and not forget anything
Put your confusion aside and make a punch list of the swap and how you're doing each phase. Itll take alot of guesswork out so you can focus on the important aspects and not forget anything
Junior Member
Joined: Aug 2011
Posts: 3
Likes: 0
Junior Member
Joined: Aug 2011
Posts: 3
Likes: 0
Re: LT1 Wiring for dummies
ok, im hoping somebody here can help me, i just finished doing an lt-1 swap on my 85 camaro. its finished and running. the motor and wire harness is from a 1994 impala ss, i used the original impala wire harness. the problem i am having is that i cannot get my oil press. gauge or tach to work. i want to use the original instrument cluster! everyhing else works, water temp, speed, volts, fuel, but no tach or oil press. rite now im using the signal wires from the impala harness and ran them directly to the cluster, according to all the diagrams i have seen all my wires are in the proper locations. any ideas of why they dont work?
Member
Joined: Mar 2007
Posts: 185
Likes: 0
From: Slinger WI
Car: 55 chevy Belair & 86IROC Z
Engine: 350 in 55 86IROC Z LT1
Transmission: 55 4speed IROC Z4L60e
Axle/Gears: 12 bolt 410 in55 and 342 inCamaro
Re: LT1 Wiring for dummies
sorry I cant help but Pocket built mine on my 86 using the lt1 harness and the 86 camaro the man is good with the wiring harness
Joined: Oct 2007
Posts: 1,375
Likes: 6
From: Wyoming
Car: 1995 Formula
Engine: LT1 350
Transmission: Built 4L60e
Axle/Gears: 10 bolt, Eaton posi, 3.73's
Re: LT1 Wiring for dummies
I had Pocket do my swap harness. I don't understand what "red 5" means and what "p102" means.
Give me instructions that say "connect this purple wire to this green wire," and I'm good he he he. That's as far as my electrical wiring ability goes.
It's hard for me to study up on this stuff when I work 70 hours a week and go to school full time.
I'm glad guys like Pocket know what's up because it helps those of us who don't know.
I admire all the guys on here who did the wiring for their swaps themselves.
Give me instructions that say "connect this purple wire to this green wire," and I'm good he he he. That's as far as my electrical wiring ability goes.
It's hard for me to study up on this stuff when I work 70 hours a week and go to school full time.
I'm glad guys like Pocket know what's up because it helps those of us who don't know.
I admire all the guys on here who did the wiring for their swaps themselves.
Junior Member
Joined: Nov 2011
Posts: 5
Likes: 0
Re: LT1 Wiring for dummies
i just read that red 5 is injector 6 im not sure as to where I should splice the 10 pin wires to and where the 6 red wires go and also where the 32 pin wires go
Last edited by 1987ircolt1; Nov 22, 2011 at 05:27 AM.
Re: LT1 Wiring for dummies
I had Pocket do my swap harness. I don't understand what "red 5" means and what "p102" means.
Give me instructions that say "connect this purple wire to this green wire," and I'm good he he he. That's as far as my electrical wiring ability goes.
It's hard for me to study up on this stuff when I work 70 hours a week and go to school full time.
I'm glad guys like Pocket know what's up because it helps those of us who don't know.
I admire all the guys on here who did the wiring for their swaps themselves.
Give me instructions that say "connect this purple wire to this green wire," and I'm good he he he. That's as far as my electrical wiring ability goes.
It's hard for me to study up on this stuff when I work 70 hours a week and go to school full time.
I'm glad guys like Pocket know what's up because it helps those of us who don't know.
I admire all the guys on here who did the wiring for their swaps themselves.
Originally Posted by 1987ircolt1
i just read that red 5 is injector 6 im not sure as to where I should splice the 10 pin wires to and where the 6 red wires go and also where the 32 pin wires go
To answer your question though, you cut those connectors off and splice them to various parts of the 3rd gen harness. Finding the pinout will tell you what each wire does so you dont have to trace them individually with a meter
Member
Joined: Aug 2010
Posts: 230
Likes: 0
From: San Antonio
Car: 1984 Z28 T-TOP
Engine: 355 Lt1 w/Hotcam
Transmission: TH700R4
Axle/Gears: 3.73 4th gen limited slip
Re: LT1 Wiring for dummies
To a message a user, click their name on the left and a drop down menu will appear. Select send private message to xyz
Please refrain from asking technical questions via PM. This is a public forum and many people often have the same question, so posting it out somewhere like here (if its LT1 harness related) will garner the best benefit and draw from the pool of other members as well
Please refrain from asking technical questions via PM. This is a public forum and many people often have the same question, so posting it out somewhere like here (if its LT1 harness related) will garner the best benefit and draw from the pool of other members as well
Junior Member
Joined: Aug 2014
Posts: 1
Likes: 0
Re: LT1 Wiring for dummies
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!!!!
I will not be able to host these for long so grab them now and hang onto them for people with future problems!!!!
Junior Member
Joined: Oct 2015
Posts: 17
Likes: 0
Re: LT1 Wiring for dummies
hey all I'm thinking about doing the lt1 swap out of a 95 caprice... everything else I can deal with except the wiring... re-pinning and whatnot I can do that and have done it before so no issues there either.... is that symatic that was provided at first for the 4th gen f-body harness is it the same as the caprices??? if not could I buy a f-body harness and use that??? instead of the d-body harness??? I work at a auto salvage so used parts would be easier for me to locate.... anyone be willing to let me add them to facebook that has done the swap before incase I have any questions come time of the swap??? thanks again
Joined: May 2004
Posts: 1,037
Likes: 2
From: Kingsport Tenn
Car: 1992 camaro
Engine: LT1
Transmission: 4L60E
Axle/Gears: 3:73
Re: LT1 Wiring for dummies
You can use the f-body harness it will do the same thing. Look thru the stickies Pocket has several diagrams that are better than this. The wiring is not that hard to do just read over the stickies you'll get it.
Thread Starter
Senior Member
Joined: Apr 2001
Posts: 884
Likes: 2
From: Québec
Engine: LT1
Transmission: 700r4
Re: LT1 Wiring for dummies
Tought about my old camaro today and came to the forum to see how that thread grew over the years. glad a few of you found useful info even if my english wasn`t the best!.
I hope you all I had fun doing it, for my part I did but moved to other projects.,,
All in all it was more of a learning process in mecanics and electrical. My camaro did 13.6 at the time which was for me quite fast. I had fun.
Now a teacher in machining and electro mecanics. still talking about all this with my students.
take care all !
PS, did I see 258000 views... wooowzer!!!
I hope you all I had fun doing it, for my part I did but moved to other projects.,,
All in all it was more of a learning process in mecanics and electrical. My camaro did 13.6 at the time which was for me quite fast. I had fun.
Now a teacher in machining and electro mecanics. still talking about all this with my students.
take care all !
PS, did I see 258000 views... wooowzer!!!
Want a title? Post!
Joined: Sep 2022
Posts: 1
Likes: 0
Re: 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.
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.
1995 firebird vin k L36 pcm pinout does not fall in to any of those
Thread
Thread Starter
Forum
Replies
Last Post
