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4th Gen Wiring; Good Progress + Info!

Old 07-10-2006, 02:43 PM
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go to the link below, and only pay attention to the last 4 or 5 posts

https://www.thirdgen.org/forums/body...light=gremlins
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Old 07-10-2006, 03:33 PM
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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.
Couldn't a relay be wired up to get "B" and "A" to connect to each other by using the power from "C"? All you want is B&A to connect to each other when A/C switch is on, right?
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Old 07-14-2006, 09:54 PM
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Anyone? Are the B&A wires really needed? A relay will make B&A functional.
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Old 07-18-2006, 01:38 PM
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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.

Attached Thumbnails 4th Gen Wiring; Good Progress + Info!-acrelay.jpg  

Last edited by Firebat; 07-18-2006 at 01:48 PM.
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Old 07-18-2006, 03:56 PM
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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.

Yah, I had thought of the relay. If you know where to find the relay, let me know.
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Old 07-18-2006, 04:35 PM
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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.
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Old 07-18-2006, 09:55 PM
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Car: 86 Monte Carlo
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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?
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Old 07-18-2006, 10:17 PM
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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?
if your tach is jumpy, you have a loose connection somewhere.
could be power into the cluster or the tach wire itself.
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Old 07-18-2006, 10:29 PM
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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.
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Old 07-19-2006, 01:08 AM
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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.
You need a Dakota Digital Tachometer calibrator.
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Old 07-19-2006, 11:20 AM
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ok so if i had a msd box it wouldnt read correctly either?
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Old 07-19-2006, 05:28 PM
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Originally Posted by Faded
You need a Dakota Digital Tachometer calibrator.
if your car is a v8 and you have a v8 cluster, etc. you shouldnt need a box. but there are exceptions.
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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Old 07-19-2006, 05:30 PM
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Car: 86 Monte Carlo
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im running 350, the tach is supposedly from 95 lt1.
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Old 07-19-2006, 05:50 PM
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Originally Posted by roughskinjrz
im running 350, the tach is supposedly from 95 lt1.
350 as in carb'd or efi?
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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Old 07-19-2006, 06:41 PM
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Car: 86 Monte Carlo
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Transmission: TH400
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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.
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Old 07-19-2006, 07:05 PM
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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.
if it wasnt a v8 cluster, idle wouldnt be at 800. somethings loose or damaged somewhere along the line.
ive seen and done it strait to a stock tach before with no trouble.
good luck.
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Old 07-29-2006, 04:18 PM
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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.
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Old 08-07-2006, 12:55 PM
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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?
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Old 08-07-2006, 04:02 PM
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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?
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Old 08-07-2006, 04:43 PM
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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
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Old 08-07-2006, 04:45 PM
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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.
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Old 08-08-2006, 02:02 PM
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it might be dark gray if it is whats it go to? i thought the two tanish wires went to the speedo?
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Old 08-08-2006, 04:15 PM
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Car: 86 Monte Carlo
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there are 2 x yellow, 2 x brown, and 2 x tan/black

tan/black x 2 = skip shift indicator

yellow x 2 = ses light
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Old 08-09-2006, 09:07 AM
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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
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Old 08-09-2006, 03:05 PM
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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.
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Old 08-15-2006, 02:20 PM
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Originally Posted by roughskinjrz View Post
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.
did you ever come up with anything on this because i test fitted mine yesterday and seen the same thing? but any way thanks for all your help roughskinjrz i seem to have the gauges working but the high beam light but im having the jumpy tach problem and i have tryed an ls1 and two different lt1 clusters and get the samething so i started on the headlight switch and now im hung-up on that my factory switch has a orange,red 2xyellow,gray,and white wire and the 4th gen plug was a orange,red,pink,yellow,and a gray or brown wire plus a thin black and gray wire but i figured that those two thin ones where for the light but maybe i was wrong!
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Old 08-17-2006, 07:47 PM
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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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Old 02-05-2008, 08:48 PM
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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.
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Old 02-07-2008, 11:58 PM
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Re: 4th Gen Wiring; Good Progress + Info!

Originally Posted by Firebird_dave7 View Post
Where did you get this and do they have one for a 87 Firebird.
I did the work and created it myself - so the answer is no, I do not have one for an '87 Firebird.
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Old 08-31-2008, 05:59 AM
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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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Old 11-02-2008, 01:05 PM
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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
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Old 04-30-2009, 01:59 PM
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Re: 4th Gen Wiring; Good Progress + Info!

are you still a member on here i seen some of your work with the speed cluster swap and i had a few questions if you are still a member let me know pls thanks Ron
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Old 04-01-2010, 07:40 AM
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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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