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Old 10-12-2017, 01:30 AM   #1
maxitoman007
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Default Help with basic wire identification

Car is a 1987 Volvo 740 Turbo wagon. Was looking in the engine bay and spotted a wire with an eyelet on the end that wasn't connected to anything. Car still ran fine surprisingly but I was wondering where this wire should go. I found it close to the battery so I tried attaching it to the positive terminology al of the battery but that just cause the battery to drain rapidly. The wire is surrounded in black corrugated plastic and runs along the bottom of the car along the driver's side all the way to the rear behind the back left wheel where it goes back into the body. Anybody know what this wire is for/ where it needs to go? Any help is appreciated, thanks.
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Old 10-12-2017, 02:39 AM   #2
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Find out where it goes once it gets inside the body. Does the car have a tow hitch?. It doesn't sound like a factory/stock wire.
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Old 10-12-2017, 03:05 AM   #3
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Does the car have an aftermarket sound system?
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Old 10-12-2017, 11:36 AM   #4
maxitoman007
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It does have a tow hitch so that is probably what it's for. Any idea where it should connect?
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Old 10-12-2017, 12:31 PM   #5
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I thought wiring for tow hitches was spliced in at the rear, into the wiring there,and does not need a hot power source other than that?

If so, it isn't tow hitch related.

Maybe it was used to power an aftermarket laser disrupter device which a PO had mounted on the rear and has since removed?
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Old 10-12-2017, 01:22 PM   #6
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Prolly for that thumpin sub
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Old 10-12-2017, 02:52 PM   #7
maxitoman007
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I honestly don't know. Maybe the car has an aftermarket sound system? I think I would notice a sub though. I'll try to send some pics later. I cut into the corrugated plastic and found that the wire is black. There are no black wires going to the battery on the wiring diagrams I've looked at, so that just adds to the confusion.
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Old 10-12-2017, 03:20 PM   #8
swedefiend
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Yeah, if that wire isn't fused at the battery, I would be very sure I knew where it goes before I connected it again.
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Old 10-12-2017, 10:19 PM   #9
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I wouldn’t hook anything up to it anymore bub. What gauge is the wire?
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Old 10-12-2017, 11:08 PM   #10
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I found it close to the battery so I tried attaching it to the positive terminology of the battery but that just cause the battery to drain rapidly..
lol I wouldn't do that again. the corrugated plastic is called split loom, and running a wire outside of the vehicles body is pretty amateurish. it is most definitely the leftovers of some questionable aftermarket installation probably audio.
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Old 10-13-2017, 02:30 AM   #11
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Oh ok, so what should I do with it, I have no clue where it's supposed to go...
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Old 10-13-2017, 04:05 AM   #12
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Wrap the end in electrical tape until you trace it out.
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Old 10-13-2017, 09:20 AM   #13
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It may have gone to a brake controller. If they used to tow with it and the trailer had electric brakes then the controller gets power all the time.
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Old 10-13-2017, 09:28 AM   #14
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don't brake controllers mount under the dash?

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Oh ok, so what should I do with it, I have no clue where it's supposed to go...
you could just leave it, but I would pull that crap out and plug any holes in the body with the right size grommet.
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Old 10-14-2017, 10:29 AM   #15
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Now I'm curious as to what poorly wired in goodie my car has lol.
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