1G 90 to 94 harness swap?

[gabe600r]

If i would change the engine harness on a 90 talon with one from a 94 would i have to change the interior one to or would i have to change some wires around inside to make it work?

 

[e85_4g63]

The only difference is one of the plugs under the dash. You need to swap 2 red wires. One is red with a black line, the other is red with black squares instead of a line. When you swap the 91+ harness into a 90 car, you need to swap these 2 wires on the plug, or the car will not start with the ignition. I've done it in more then 1 1990 car. I don't have pic's on this computer, but you'll see exactly what I mean when you do it. All the plugs plug in. The plug I'm talking about is over by the ECU. It's a white end. When you plug the 91+ engine bay harness into the 90 car, you'll notice that the 2 wires I'm talking about are swapped. You just need to match them back up.

Shoot me a PM if you have any more questions.

 

[19Eclipse90]

Read this and then ask questions: http://www.dsmtuners.com/forums/articles-electrical-wiring/412841-1990-engine-control-wiring-harness.html

 

[gabe600r]

thanks

 

[3kgt2nv]

when i did mine i did both harness just to make sure it was a plug and play swap instead of hacking up a virgin harness to make it work.

 

[gabe600r]

If i do swap the harness and the wires in the white plug can i still use the 90 computer

 

[19Eclipse90]

Sure. Switch pins 6 and 14 on the harness for the ECU and you'll be fine. Course, if you read the article you'd know that.

 

[SBstar]

There is a dash plug on the passenger side footwell that needs to be shaved in order to plug in. Also if you swap a 91+ wiring harness in you'll need a 91+ tachometer swapped in. The plug everyone thinks of can be wired in color matched, there will be several wires that aren't used. In the engine bay the CAS has a different plug from 90 to 91+, as well as the TPS I believe. It's been quite a while since I did it so my memory might be sketchy but that should about cover it.

 

[gabe600r]

i think im gonna just swap in both harnesses the only proublem is the 93 harness i have is for a front wheel drive not all wheel there shouldnt be much differance tho right

 

[gabe600r]

So i swapped my 90 harness today with a 94 harness there are some differences but only need help with two for now im guessing that the two plugs above the fuse box go to the ac fuse box do i need them if not running ac or can i get rid of that altogether cause the one plug is different and wont plug in also what is the silver box also above the fuse box for the 94 harness wont plug into that either

 

[19Eclipse90]

You'll get much better answers if you provide pictures of your rather generic descriptions.

 

[gabe600r]

What kind of picture do i need just to ask if i can get rid of my ac fuse box altogether and as far as the box its kinda hard to get a pic of it where it is located best i can describe is that it is like 4inches long and maybe 3 inches wide and is mounted right above the fuse box up in the corner

 

[gabe600r]

Does anyone have a full picture labeling what the plugs go to for a 1g interior harness there is a good pic on here of the engine bay harness but cant find one for the interior one

 

[19Eclipse90]

I haven't finished my article for the engine compartment harness yet. Fortunately for you, this just came up recently and may help: http://www.dsmtuners.com/forums/electrical-tech/460206-gift-anyne-planning-1g-wire-tuck.html.

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Please stop creating new threads for your wiring issues. One was enough.

 

[gabe600r]

Im not creating threads with the same issues they are all differant questions

and im looking for the interior harness pictures not engine or front lights harness which i beleave that was a picture of

 

[Technoklipz]

Your best bet is to find a factory service manual. It will help out a lot when determining what goes to what. I found a two set volume on ebay for $30. Good luck.

 

[born2tune]

A good way to do it without any help is that you reconnect everything where it goes and then you label each connector with a strip of tape that you know that you will need/keep. then once they are all identified you can unloom the harness and basically cut the wires and connectors that wont be used.

at that point you can either re-loom it and put it together or reconnect them unloomed and create your own route for your wires. if you create your own route some wires may require increasing the length so in this case you would label the wire twice on the same line and cut in between wires so both ends correspond with your identification. like taping them where you want to cut(wire A2/ wire A2) so when you reroute all you have to do is add another wire and pair both A2's together.

I hope this makes sense to you, its dummy proof. if you need a re explanation I can do that. but if you are inquiring for a different topic let me know and I will see what I can do for you.

 

[gabe600r]

The real problem is that the 94 harness dont have the wiring for the flip up headlights and the 94 parking lights are on all the time when the headlights are on where as the 90 they are only turnsignals so my problem is that the plug above the fuseblock that connects to the front harness dont plug in

 

[19Eclipse90]

Between AWD and FWD turbo, assuming the same options and transmission type, there will not be any differences for a specific model year.

 

[19Eclipse90]

Everything A/C related can be removed if you are so inclined. That includes the A/C fuse box on the driver's side fender by the firewall.

 

[19Eclipse90]

and im looking for the interior harness pictures not engine or front lights harness which i beleave that was a picture of

You're right. I misunderstood what you were asking. To answer you're request, there isn't a collection of pictures for interior harness connectors that I am aware of on the web. If you want one...

Your best bet is to find a factory service manual. It will help out a lot when determining what goes to what. I found a two set volume on ebay for $30. Good luck.

...do this. It's the easiest way to get everything figured out. There's no benefit for me to drop everything and do all the leg work for you to make it all work. There are intricacies to the harnesses, junction blocks, and other electrical components that would take a bit of time to weed through. I plan to get through it and document it one day but that is still many leagues away.

I was refered to you with a question about a 90 car there is a box behind the drivers side kick panel that the newer 94 harness does not have do you know what it is for it also ties in to the box behind the passenger side kick panel where the 94 just has the passanger side box would I not need the one on the drivers side and any other help u could give me on how to make the 94 harness swap work in the 90 would be great the engine and interior harness are 94 and the little harness on the dash and the one that wraps around the front of the car are 90 cause I need the flip up headlights to work

The passing control relay -- involved in the pop-up light circuit -- only exists on models with... which is why you don't find it on the '94.

 

[gabe600r]

Ok thanks I fugure it will clean up the engine bay alittle if I dont need it

 

[gabe600r]

What is the box behind the passenger side kick panel for? I did trace the wires from the driver side box and only have one wire that I am not sure what to do with its a black wire with blue stripe it had ran to the passenger side box behind kick panel on the 90

Well I broke down and ordered the factory repair books on ebay just sucks I only have like a month to get this car done for a show in late april and its not looking like that will happen there is still alot of work left and the weather here isnt helping calling for snow tommorow

 

[19Eclipse90]

The passenger side is most likely the door lock control unit. That is also where the theft alarm control units were on '90 models but there were two connectors running to it where the door lock control unit has only one.

 

[gabe600r]

Yea the 90 had two plugs going to it so why would the box on the driverside tie in to it do the lights flash when the alarm goes off could that be why?