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Message: [QUOTE="PDT1081, post: 1111922, member: 1197"] One of those wires at the switch activates the relay. That is the one you want to hook the upfitter to. One of them is power coming from the source, most likely the red wire. The other is a ground wire, probably coming from the black wire. The purpose of the ground wire is for the lighted switch. It if were ME, I would use a multimeter to determine which wires is connected to where. One should have continuity with the red wire, one with the black wire. I would ignore those two and hook to the third. Or, I'd separate the harness at the relay and determine which wires go where. [/QUOTE]

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