re: Pulled the wiring harness from my fifth wheel

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DownshiftAndFloorIt

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I did somewhat that to identify which wires were to what lights. Jumped a wire from a 12v battery to each wire and then see what operated. None of the white wires or blue wires operated anything lights wise. That’s where I assumed the white wires were ground/negative and the remaining blue were the brakes.

To my understanding there should only be one wire controlling the brakes. I haven’t tested the white wires to the brakes so it may be possible that one of the white wires is actually the brake control wire but that still leaves me an odd ball blue wire that goes to something.