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Message: <blockquote data-quote="Pony Ruiz" data-source="post: 182054" data-attributes="member: 101">I did test / put 12v to the white/red wire that goes to the 12v in on the new regulator I bought a while ago - don't remember where.  At this point I am I assuming it is good, then again.edit:  sent power through white/red checked power at output of 7v.  I have 7v :clapping: The voltmeter came to life but I get nothing to the temp and gas - which I wouldn't expect.  More puzzling none of the lights worked.  I tested one of the lights with the battery and jumpers - good.  I am assuming I'd get lights all around even thought temp and gas don't register.Might that mean reg. is no good?  Or if it is, is there another power source coming to the plug.I'd love for someone with a 78-79 to test that plug with the key on and tell me which wires have power. Only the aux box has power to mine.Dan you are right about wiring diagrams.  I now have the plug ensemble apart and the wires that go to the plug for the gauges are almost all different colors coming into that plug.One wire is jumped across to another connector.  It doesn't look like it has been tampered with.</blockquote>