Hey, I searched a little and all the answers I found were WAAAAYYY off, so here's the situation- The stock ignition I'm replacing has 3 wires. Black/red, black/yellow, black white. I'm ASSuming this is constant power(BAT), key power(IGN), and ground(?) (UNLABELED). On my "universal key switch" I have 4 location options. BAT, IGN, ACC (<-- won't be using that one) and the 4th and center post is UNLABELED. I'm GUESSING that the black/red is constant, the black/yellow is keyed and the black/white goes to the unlabeled. Using a multi-meter, can someone tell me how to test these theories? Many thanks!!!