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My husband says that your mystery wire has to do with the tail/brakes/turn signals. Yours must be the original wiring harness, he's seen that before where black is the ground (in the updated harness they're green). He says hook up a test light or a meter to it and hit the brakes. It should do something. He also said look at the rest of the forum, there's threads with the wiring schematic for our quads on here somewhere.
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