When I replaced the water pump I found the main gound wire to be loose. It is located (in our coach) right behind the power cord reel on a main frame meember (ceiling). Ours was loose to the wire, not loose to the frame. May want to check yours. We were having some "flickering" in lights and the Microwave kept loosing the time, may have been the issue. I have read that many problems can be created by the main ground being loose.
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38ft, 2004, Diesel
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