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Nov 12, 2016 | 09:02 PM

jseremba

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Wiring

I own a 1989 6 spd. bone stock.
The car has wires that are cut, added, etc. I was thinking of replacing the wiring harnesses. Has anyone done this? Did it pay off for them in that they had less shorts etc. I found the engine harness online. Is there another one for the engine comparment?

Thank you

Nov 12, 2016 | 11:22 PM

WVZR-1

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Quote:

Originally Posted by jseremba

There are two harnesses under the hood on an '89. There are 2 from the C100 on the left side, the engine and forward lamp harness. The "pass-through" to the ECM behind the distributor/right cylinder head is part of the engine harness it appears.

The engine harness on the C100 is dependent upon options. Does your car have C60 or C68 AC? I have both harnesses for the C100 removed from an '89 M6 that are uncut. These harnesses are from a C68 car I'm quite sure but the tag is still on it so I can confirm. These don't seem to suffer from insulation shrinkage either.

If your car has C60 AC a correct harness becomes a real chore. There seems to be maybe a couple potential possibilities.

Drop me an email and we can discuss these.

Last edited by WVZR-1; Nov 13, 2016 at 08:09 AM.

Nov 13, 2016 | 08:12 AM

jseremba

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Quote:

Originally Posted by WVZR-1

The problem I am having is periodic shorts. Just recently this week my ECM went bad. I realize it is old and would eventually go bad. But I cannot help but think that it could have been because the previous owner added, subtracted etc wires. Under the dash drivers side is a rats nest of wires. I can tell that some of them are not factory. But I am SOOOoo poor at tracing wires and continuity I wold rather have a complete harness that I can plug in. At least then if someone had to trace the wires they could use the factory decision tree without deciphering the changes. And in my engine compartment I have three wires that come off the factory harness and run to the front of the car. I have no clue what they went to. But, they are clearly factory.
I guess my real need is the harness under the dash. Drivers side.
Thank you

Nov 13, 2016 | 08:32 AM

WVZR-1

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Quote:

Originally Posted by jseremba

And in my engine compartment I have three wires that come off the factory harness and run to the front of the car. I have no clue what they went to. But, they are clearly factory.

I guess my real need is the harness under the dash. Drivers side.
Thank you

I see as many as 8 choices for an "in car under-dash" harness. That get's very complicated - very. You didn't mention if C60 or C68. Which?

The three wires you mention I'd think could easily be identified.

Nov 13, 2016 | 08:43 AM

jseremba

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Drifting

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Quote:

Originally Posted by WVZR-1

The car is not here. Presently it is getting the ECM replaced. But, the AC is automatic not manual, if that helps. And as far as it being complicated. Somehow I just knew you or somebody else would be saying that. It's just when I look under there and see wires that look like they were thrown in there, cut wires etc. You know what I mean.
Here is a picture of the wires. The harness is just under the brake reservoir, Over the fan relays over the drivers side fender to the very front of the car, I think?

Thank you for the help.

Attached Images

Last edited by jseremba; Nov 13, 2016 at 08:44 AM. Reason: update

Nov 13, 2016 | 09:15 AM

WVZR-1

Team Owner

Joined: Sep 2003

Posts: 25,361

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Quote:

Originally Posted by jseremba

Here is a picture of the wires. The harness is just under the brake reservoir, Over the fan relays over the drivers side fender to the very front of the car, I think?

Thank you for the help.

When you say "under dash" do you mean inside car or you're referring to "under-hood" but at the dash/firewall? Your snapshot is under-hood but your post #3 hints "inside car".

Do you have the FSM?

Last edited by WVZR-1; Nov 13, 2016 at 09:16 AM.

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