Quite possibly the problem is in the ground side of the circuit. The jack makes the electrical ground connection to the baseplate, but if there is a layer of paint between the jack and the frame, that can cause the problem you see, since the frame flexes a bit as you close. Even more likely is an intermittent ground connection between the swing tongue and the trailer frame, if you have a swing tongue. If so, this will require a wire jumper across the hinge. You didn't mention what model TM you have, and whether it has a swing tongue - why don't you add it to your signature? This would also help us determine where the wire is routed to get to your jack,
Bill
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