One comes from the controller to a 4 way connector then to the switch, the other returns to ground, usually to a screw on the step frame. just follow the wires from the switch back through the door frame and to the step, the ground is likely loose or broken right at the connector. But before you even lay on the ground, take the magnet mount out of the door of the door itself and make sure the magnet is seated properly. Not sure about the wire color to ground, just looked at a wiring diagram and it said brown, not a choice for either of us!
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2002 Monaco Executive
Cummins 500ISM (11L)
Castle Rock, CO
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