I'm not sure how constant they are at the factory with the wiring colors for the TStat. The wiring harness in ours is a 6-wire cluster, only 3 of which are being used. They used Red, Green, and Orange to wire our TStat. I'm not sure how they make sure it is wired correctly at both ends if they are randomly selecting wires from the cluster. I'm only suggesting that the wire colors might not be same from trailer to trailer.
A volt meter should give you "Hot" (remember that it's 12v). "Ground" and "Common" might be more of a guessing game.
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Jeff & Sandi (and Teddy - 7lb Schnorkie)
2018 Montana HC 305RL / HW Progressive EMS
2015 RAM 3500 Laramie Longhorn Crew Cab 4x4 DRW / Demco Recon Hitch on RAM Puck Ball
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