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Originally Posted by H3 Hummer 64
OK I got my factory switch and harness in the mail today. However the three wires coming out the back of the harness are not labeled as to what they are. Does anyone know which wire is the +, -, and 12 volt source? All three wires are gray. I'm trying to splice this in to replace the PIAA switch.
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My best bet is to test or try them both, I think that's what I did. Make sure to do it before you put back the dash cover.
