Help! Wiring question - I'm an idiot...

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30 Mar 2013 15:53 #14128 by otisp1
Ok, long story short:
'85 32v 5-spd. Had a fire last October, right front corner at 14-pin connector was the epicenter. Fried all three harnesses, hoses, plastic etc. Got new (used) harnesses from Mark and Tom at 928 Int'l, lots of other parts from them and everybody else, etc. So, I have everything pretty much rehabbed, and almost ready to fire it up again.
BUT I'm an idiot and can't figure out where one last wire goes, on the engine harness. Branches off of the main harness near where the alternator wires do. Brown, I'm pretty sure, so it must be a ground? But I can't remember where to.

Attached files [img]media/attachments/14494=1758-March30_20134 (Small).JPG[/img]

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30 Mar 2013 17:03 #14130 by Alan
Replied by Alan on topic Help! Wiring question - I'm an idiot...
It may not be brown (or at least it may not have originally been brown).

Colors change in the engine bay - usually reds end up brown...

Where does it exit the harness and what else does it connect to.

You should have 2 similarly size red connections to the alternator main terminal (one goes to the starter, the other goes to the jump post...)

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30 Mar 2013 20:33 #14141 by otisp1
Replied by otisp1 on topic Help! Wiring question - I'm an idiot...
Yes, I was thinking that it may not have started brown, but the other reds are "redder" so I was thinking it was a brown. But I didn't remember there being a ground there.
I have the two reds to the alternator - I was pretty sure I got all the wires on the alternator correct.
This wire comes off the main harness just before where the alternator wires split off from the ones to the starter. Also have the oil pressure sender connected and the oil level wire connected.
I'm pretty stumped, I've replaced about a billion wires and I don't remember this one. I defer to you guys who have more 928 experience:confused:

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30 Mar 2013 22:19 #14142 by Kiln_Red
Replied by Kiln_Red on topic Help! Wiring question - I'm an idiot...
In my opinion, that is definitely a ground wire. I'll compare what you've described to the harness on my S3 tomorrow if it is any help. Alan is the electrical guru, so I won't be surprised if he delivers an answer before I get a chance to look over my harness.

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30 Mar 2013 23:03 #14143 by otisp1
Replied by otisp1 on topic Help! Wiring question - I'm an idiot...
Awesome thanks. Appreciate any help. I do have another 85 as well but I'm still digging out of the driveway! I should be able to get it into the garage tomorrow so I can get under and have a look.

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31 Mar 2013 16:25 #14163 by otisp1
Replied by otisp1 on topic Help! Wiring question - I'm an idiot...
OK, it just got more confusing for me. I looked underneath my wife's, an '85 32v auto, and I can't find that wire on that car. So maybe a couple of other possibilities now:

1. Could it be a variation in harnesses or some kind of variation in years, maybe the harness is off of an 86?

2. This wire might normally branch off of the main harness behind the front engine cover, and it's just the way I have the harness positioned that has this wire so close to the alternator. Is there a ground on the engine harness at all?

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31 Mar 2013 19:10 #14166 by otisp1
Replied by otisp1 on topic Help! Wiring question - I'm an idiot...
OK, mystery solved. I was able to connect the battery today, and it is hot! I was sure I had accounted for all the red wires, and I had. Apparently it is the ABS power wire. But I don't have ABS.

So thanks very much for the responses. I owe you a cold Canadian beer! Hopefully I can pay up if there's a gathering in Alberta next summer!

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31 Mar 2013 21:11 #14173 by Kiln_Red
Replied by Kiln_Red on topic Help! Wiring question - I'm an idiot...
Good to hear, Mark. Looks like I was wrong in my estimation that the wire in question was for a ground. Glad you could source its location. How did you decide to hide it since it is not in use?

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31 Mar 2013 23:13 #14177 by otisp1
Replied by otisp1 on topic Help! Wiring question - I'm an idiot...
Thanks Austin. It's hot, so I'll try to find the other end and disconnect it, then just cut it off. It either connects at the hot post under the hood or at the starter.

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01 Apr 2013 11:37 #14184 by wallyp
Replied by wallyp on topic Help! Wiring question - I'm an idiot...
Make sure that you have the wire feeding the jump start post connected, as this feeds virtually everything on the car. This cable runs from the starter post (where the main battery cable connects) up to the jump start post.

If it went to the ABS, that connector is a block in the right front corner of the engine compartment (if the car is so equipped).

Wally Plumley
928 Specialists
www.928gt.com

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01 Apr 2013 20:18 #14190 by otisp1
Replied by otisp1 on topic Help! Wiring question - I'm an idiot...
OK, I think I have it solved. I found the other end of it at the starter and disconnected it. I guess I will tear the cover off of the last third of the harness to remove that wire, while the car is up on stands.
Wally, you're right, this wire is on the same connector at the starter as the one that goes to the hot post. I had to figure out which was which.
Thanks again everybody for the help!!:)

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