E21 engine bay wire question

[mr.vang]

I know this is an e30 forum but I'm sure some of you guys have owned an e21 in the past, so I could use your help.

I just bought my first e21 and found this wire hanging lose around the alternator area. Look like the previous owner cut the wire and clamp in a small gauge wire to the end. The car start and is running great, so I'm stumped where it should be hook up to.

Thanks in advance.

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[Stanley Rockafella]

something aftermarket?

[mr.vang]

something aftermarket?

Yes, by the look of it, it was cut and wrapped in black electric tape. You can see the contrast between the gray and electric tape.

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[kickinindian]

either an aftermarket alarm that maybe was controlling the alternator or maybe an oil pressure switch that broke off the block?

[TobyB]

in the past

What is this 'past' you speak of???

Given that it's coming out of a factory harness, are you sure it's not the charge
light/exciter for the alternator? What's the color(S) before the buttheadsplice?

I can look under the hood of mine tomorrow...

t

[pandaboo911]

Blue is alternator Field wire. Check that you’re getting 13-14v while running