I have grey and black wires, the greys go to the switch the blacks I will trace out after work. When I put the meter to the 12v dc wires the meter reads -12.5v dc with the red meter lead on grey and the black meter lead on black. then I change it around and I read 12.5v dc no more - so i figured the grey wire is the ground wire, neg, to the meter. Does that make sense?
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