4th Gen Wiring; Good Progress + Info!
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Joined: Jul 2005
Posts: 1,423
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From: Miramichi, NB
Car: 86 Monte Carlo
Engine: Blown 489
Transmission: TH400
Axle/Gears: 9" 370s
go to the link below, and only pay attention to the last 4 or 5 posts
https://www.thirdgen.org/forums/body...light=gremlins
https://www.thirdgen.org/forums/body...light=gremlins
Originally Posted by Faded
Well check to make sure you're not hooking up to a ground. The wires of interest to you (on the body wiring) are the brown, gray and light green wires.
Brown is the wire labelled "E" on the third gen harness, gray is "D" and light green is "C". The light green wire isn't as thick as the other two. Brown should be hot when the ignition is on, gray gets power from brown whenever the controls are on any setting but off, and light green gets power from brown whenever the controls are on an AC setting or defrost.
There are two other wires from the body that aren't hooked up to the switch. Dark green and black. Dark green is "B" on the third gen harness and black is "A". Dark green is supposed to get a ground from black whenever an AC setting is selected. Unfortunately the 4th gen switch does not have any way of supporting this feature.
I would check to make sure that you aren't accidently using the dark green or black wire. This could cause the short if you are.
Brown is the wire labelled "E" on the third gen harness, gray is "D" and light green is "C". The light green wire isn't as thick as the other two. Brown should be hot when the ignition is on, gray gets power from brown whenever the controls are on any setting but off, and light green gets power from brown whenever the controls are on an AC setting or defrost.
There are two other wires from the body that aren't hooked up to the switch. Dark green and black. Dark green is "B" on the third gen harness and black is "A". Dark green is supposed to get a ground from black whenever an AC setting is selected. Unfortunately the 4th gen switch does not have any way of supporting this feature.
I would check to make sure that you aren't accidently using the dark green or black wire. This could cause the short if you are.
Here's how. "C" is wired to both the a/c controls and this relay. When "C" is switched on by the A/C controls, it will also give power to the relay. When the relay energizes(has ground and power across it), it closes the switch inside and connects B to A.
Last edited by Firebat; Jul 18, 2006 at 01:48 PM.
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From: California
Car: '91 Firebird
Originally Posted by Firebat
Here's how. "C" is wired to both the a/c controls and this relay. When "C" is switched on by the A/C controls, it will also give power to the relay. When the relay energizes(has ground and power across it), it closes the switch inside and connects B to A.
I had a few extra from the LT1 swap and then a few more extra from the dash swap. Any relay meant for a car, with 4 wires will work, even 5 wires will - just don't use the 5th wire(87A wire). Any auto store sells them too.
Supreme Member
Joined: Jul 2005
Posts: 1,423
Likes: 1
From: Miramichi, NB
Car: 86 Monte Carlo
Engine: Blown 489
Transmission: TH400
Axle/Gears: 9" 370s
my gauge lights arent working.
i also have lt1 gauges, but my tach is kind of jumpy i have 350 also. would hooking up to msd box fix this?
i also have lt1 gauges, but my tach is kind of jumpy i have 350 also. would hooking up to msd box fix this?
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From: p'cola FL
Car: 88 iroc-z/28
Engine: 408 lsx
Transmission: 5800 stall
Axle/Gears: 4.71
Originally Posted by roughskinjrz
my gauge lights arent working.
i also have lt1 gauges, but my tach is kind of jumpy i have 350 also. would hooking up to msd box fix this?
i also have lt1 gauges, but my tach is kind of jumpy i have 350 also. would hooking up to msd box fix this?
could be power into the cluster or the tach wire itself.
Supreme Member
Joined: Jul 2005
Posts: 1,423
Likes: 1
From: Miramichi, NB
Car: 86 Monte Carlo
Engine: Blown 489
Transmission: TH400
Axle/Gears: 9" 370s
power into the cluster?
it idles fine, but when i give it a shot of gas it seems its revving higher then the motor really is, thats all i meant by jumpy.
it idles fine, but when i give it a shot of gas it seems its revving higher then the motor really is, thats all i meant by jumpy.
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From: California
Car: '91 Firebird
Originally Posted by roughskinjrz
power into the cluster?
it idles fine, but when i give it a shot of gas it seems its revving higher then the motor really is, thats all i meant by jumpy.
it idles fine, but when i give it a shot of gas it seems its revving higher then the motor really is, thats all i meant by jumpy.
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From: p'cola FL
Car: 88 iroc-z/28
Engine: 408 lsx
Transmission: 5800 stall
Axle/Gears: 4.71
Originally Posted by Faded
You need a Dakota Digital Tachometer calibrator.
years of clusters. v6 cluster, ls1 cluster etc.
see if everything is right before you buy a box and still have the same problems.
an msd will not fix your problem either. one of their tach adapters might work.
all depends.
what motor and cluster are you running. etc... ?
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From: p'cola FL
Car: 88 iroc-z/28
Engine: 408 lsx
Transmission: 5800 stall
Axle/Gears: 4.71
Originally Posted by roughskinjrz
im running 350, the tach is supposedly from 95 lt1.
you run run a carb setup, and you 100% have a v8 cluster, you dont need a box, AFAIK. one wire, should work awesome.
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Joined: Jul 2005
Posts: 1,423
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From: Miramichi, NB
Car: 86 Monte Carlo
Engine: Blown 489
Transmission: TH400
Axle/Gears: 9" 370s
yeah its carbed. but when i rev it, it seems so floppy revvin up... quicker then it should.
the guy could have lied to me about the tach being v8. it idles at 800rpm just like it should.
the guy could have lied to me about the tach being v8. it idles at 800rpm just like it should.
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From: p'cola FL
Car: 88 iroc-z/28
Engine: 408 lsx
Transmission: 5800 stall
Axle/Gears: 4.71
Originally Posted by roughskinjrz
yeah its carbed. but when i rev it, it seems so floppy revvin up... quicker then it should.
the guy could have lied to me about the tach being v8. it idles at 800rpm just like it should.
the guy could have lied to me about the tach being v8. it idles at 800rpm just like it should.
ive seen and done it strait to a stock tach before with no trouble.
good luck.
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Joined: Jul 2005
Posts: 1,423
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From: Miramichi, NB
Car: 86 Monte Carlo
Engine: Blown 489
Transmission: TH400
Axle/Gears: 9" 370s
im having a problem with the dash, everything is ok. But for the bolts that hold the dash to the firewall at the top, if i have the farthest one on the passenger side and the middle one and TRY to put the driver side one in the screw doesnt even reach the dash. I have to put stress on it for it to go in, and i did. The next morning the passenger side dash bracket cracked and popped out. 
Joined: Sep 2005
Posts: 1,125
Likes: 55
From: PA
Car: 92 camaro RS
Engine: LSA
Transmission: Magnum F
Axle/Gears: TNT 8.8 wavetrac 3.31
ok i need some big help with the wiring up of my lt1 cluster i have read everthing i could find took down notes anything to get these to work but i get nothing none of my gauges will move i think after i cut out my factory connectors i had three wires left over that i could not find a place for maybe a dark brown and a green i think not sure but shouldn't i see something working ar least?
Supreme Member
Joined: Jul 2005
Posts: 1,423
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From: Miramichi, NB
Car: 86 Monte Carlo
Engine: Blown 489
Transmission: TH400
Axle/Gears: 9" 370s
dark brown x 2?
is it dark gree? could be your vehicle speeed sensor, or coolant temp sensor?
if you hooked them up right, did you hook up the 3 grounds underneath the steering column?
is it dark gree? could be your vehicle speeed sensor, or coolant temp sensor?
if you hooked them up right, did you hook up the 3 grounds underneath the steering column?
Joined: Sep 2005
Posts: 1,125
Likes: 55
From: PA
Car: 92 camaro RS
Engine: LSA
Transmission: Magnum F
Axle/Gears: TNT 8.8 wavetrac 3.31
ok double checked on whats left and there was two dark brown wires then another dark brown with a white stripe and a geenish one left
Supreme Member
Joined: Jul 2005
Posts: 1,423
Likes: 1
From: Miramichi, NB
Car: 86 Monte Carlo
Engine: Blown 489
Transmission: TH400
Axle/Gears: 9" 370s
the 2 x brown isnt used. i dont see another brown one, you sure its not dark grey?
the green could eitther be high beams, coolant temp. its just green right no green with black stripe which is your speedometer if its not a cable.
the green could eitther be high beams, coolant temp. its just green right no green with black stripe which is your speedometer if its not a cable.
Joined: Sep 2005
Posts: 1,125
Likes: 55
From: PA
Car: 92 camaro RS
Engine: LSA
Transmission: Magnum F
Axle/Gears: TNT 8.8 wavetrac 3.31
ok after rechecking my third gen wiring i have 2 dark gray wires another dark gray with stripe and a green wire with black stripe those wires are whats left from my factory connectors
Supreme Member
Joined: Jul 2005
Posts: 1,423
Likes: 1
From: Miramichi, NB
Car: 86 Monte Carlo
Engine: Blown 489
Transmission: TH400
Axle/Gears: 9" 370s
green with black stripe is your speedometer
dark grey i didnt use, but there was only 1 dark grey, there are a couple other grey wires they are for illumination but are more lighter then the dark grey.
dark grey i didnt use, but there was only 1 dark grey, there are a couple other grey wires they are for illumination but are more lighter then the dark grey.
Joined: Sep 2005
Posts: 1,125
Likes: 55
From: PA
Car: 92 camaro RS
Engine: LSA
Transmission: Magnum F
Axle/Gears: TNT 8.8 wavetrac 3.31
im having a problem with the dash, everything is ok. But for the bolts that hold the dash to the firewall at the top, if i have the farthest one on the passenger side and the middle one and TRY to put the driver side one in the screw doesnt even reach the dash. I have to put stress on it for it to go in, and i did. The next morning the passenger side dash bracket cracked and popped out.
Joined: Sep 2005
Posts: 1,125
Likes: 55
From: PA
Car: 92 camaro RS
Engine: LSA
Transmission: Magnum F
Axle/Gears: TNT 8.8 wavetrac 3.31
ok got the headlight switch working right but not the dimmer switch and i have no lights on my gauges and still the jumpy tach to get straight yet!
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From: The Fastest RaceWay Ever U.S. 41
Car: 1987 Firebird
Engine: Present=350/4brl, Future=455 H.O.
Transmission: Present=700R4, Future=Richmond 6Spd
Axle/Gears: Now Stock, Later 3.73
Re: 4th Gen Wiring; Good Progress + Info!
[quote=tpiroc;1736140]Alright folks, there are some good wiring resources floating around here to wire up a 4th gen gauge cluster, but none of them seemed to match an 85 set of plugs properly. The colors of the wires are right, but not the sequence. So, I double checked ALL the wires and sure enough the colors are right, so here's a new guide for an older style connector, namely an 85 TPI dash;
quote]
Where did you get this and do they have one for a 87 Firebird.
quote]
Where did you get this and do they have one for a 87 Firebird.
Thread Starter
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From: Oregon
Car: GM & Jaguar
Engine: Various
Transmission: Various
Axle/Gears: Various
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Joined: Jul 2007
Posts: 45
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From: Kentucky
Car: 88 Trans Am GTA
Engine: 350
Transmission: Borg Warner WCT-5
Axle/Gears: 3.45
Re: 4th Gen Wiring; Good Progress + Info!
where might I find these plugs...I'm trying to chase down my tach wires to hook them to my HEI distributor. When I got my 88 gta it had no (305) motor and no wires were labled
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From: Summerdale, AL
Car: 92 Camaro
Engine: El Tee Juan
Transmission: Tee five six
Axle/Gears: 10 Bolt 4:10's
Re: 4th Gen Wiring; Good Progress + Info!
Ok I need help with my 4th gen headlight switch/dimmer wiring... I have a 92 camaro, and the dash I got came out of a 2002 35th anniversary ss. So far these are the wires from the 3rd gen to 4th gen that I have...
3rd gen headlight switch colors
Red
Orange
Black
Brown
Yellow
Green
White
4th gen headlight switch colors
Red (x2)
Orange
Black
Yellow
Grey
Brown
Then I have my dimmers...
Third gen dimmer colors
Light yellow?
Purple
Black
Grey
4th gen dimmer colors
Brown
Green
Black
Grey
Someone please help me match the colors up
3rd gen headlight switch colors
Red
Orange
Black
Brown
Yellow
Green
White
4th gen headlight switch colors
Red (x2)
Orange
Black
Yellow
Grey
Brown
Then I have my dimmers...
Third gen dimmer colors
Light yellow?
Purple
Black
Grey
4th gen dimmer colors
Brown
Green
Black
Grey
Someone please help me match the colors up
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Joined: Feb 2009
Posts: 165
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From: whiteman afb mo
Car: 1983 camaro
Engine: 350 soon to be 355
Transmission: T-5
Re: 4th Gen Wiring; Good Progress + Info!
if i could get a complete dash out of a 95 camaro for $125, but he says he cut the airbag and a/c heat controls out of the harness, do you guys still think it is a good deal?
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