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Igeo
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Joined: September 25, 2018
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Location: Oakland, CA
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 Posted: Fri Apr 09, 2021 9:22 am Post subject: Another Mystery Wire |
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I'm messing with my alternator, and once it was out, I see a cut off wire laying down there beneath it. Any ideas on what that is?
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1987 Westfalia 2.1 WBX Manual |
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0to60in6min
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Joined: November 27, 2006
Posts: 3417
Location: OR & CA (Oregon/California)
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| Posted: Fri Apr 09, 2021 9:31 am Post subject: Re: Another Mystery Wire |
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| High oil pressure sender wire? The sender is behind the crank pulley. |
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Igeo
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Joined: September 25, 2018
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Location: Oakland, CA
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| Posted: Fri Apr 09, 2021 9:39 am Post subject: Re: Another Mystery Wire |
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| 0to60in6min wrote: |
| High oil pressure sender wire? The sender is behind the crank pulley. |
All systems function on this van, so I don't think that's it.
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djkeev
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MarkWard
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| Posted: Fri Apr 09, 2021 9:49 am Post subject: Re: Another Mystery Wire |
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Follow it forward. In general, brown wires are grounds. It looks brown in the picture.
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brickster
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| Posted: Fri Apr 09, 2021 10:06 am Post subject: Re: Another Mystery Wire |
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Agree that it's a ground.
I had an 85 that generally ran well, but would digifart on the highway in certain conditions. After chasing it for months, I finally saw that this ground was not connected. Cleaned it up and reconnected and my problem vanished. |
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Igeo
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Location: Oakland, CA
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| Posted: Fri Apr 09, 2021 10:24 am Post subject: Re: Another Mystery Wire |
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My thought was a ground also. Do you recognize this location for routing a ground wire? It's fairly heavy guage, and runs under the throttle body.
I guess I could see if it has continuity to the fuse panel.
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MarkWard
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| Posted: Fri Apr 09, 2021 10:37 am Post subject: Re: Another Mystery Wire |
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I don't recall any wire routing in that location. Grounds don't run to the fusebox. They either go to the chassis or act as a ground path for a component. I'd try to fish it out from under the intake while you have that room and follow it to the other side of the engine bay.
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Igeo
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| Posted: Fri Apr 09, 2021 10:54 am Post subject: Re: Another Mystery Wire |
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| MarkWard wrote: |
| I don't recall any wire routing in that location. Grounds don't run to the fusebox. They either go to the chassis or act as a ground path for a component. I'd try to fish it out from under the intake while you have that room and follow it to the other side of the engine bay. |
It seems to run to the bellhousing, but is hard to see under there. I thought maybe if it was connected to a component, that it should have continuity at the panel.
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MarkWard
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| Posted: Fri Apr 09, 2021 11:05 am Post subject: Re: Another Mystery Wire |
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The picture is poor, but there was a vw dealer diagnostic sensor that was pressed into the engine case just in front of the throttle body. It was more of a shielded wire with a molded plug that was attached to the alternator for access. So, if that is the wire with the molded end off, you can just ignore it.
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0to60in6min
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Igeo
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| Posted: Fri Apr 09, 2021 11:36 am Post subject: Re: Another Mystery Wire |
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After going through the links, I'm convinced that it's for that VW diagnostic plug that is not used and someone cut off. It does stick out of the bellhousing too- seemingly intended as a crank position sensor? Weird.
Thanks all.
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