Mystery wire

[DieHardBuick]

I have a lot of these but this loose wire is black, heavy gauge, with a small eye end. In a small bundle from behind engine to passenger side. See photo. Any idea what it goes to?

 

[Boost231]

You'll have to trace it. Maybe a temp sensor for a aftermarket gauge

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[~JM~]

That is the O'Crap wire!

You better fix it.