More investigation has revealed that the white wire is common with the ground in the breaker box. The black wire is open somewhere between the breaker box and the ac unit. I have found which breaker the ac unit is on so now I am trying to trace the wire to the front of the coach. At the ac unit the wire comes from the passenger side of the coach. Do you suppose it comes across the coach in the roof at the rear and then travels in the wire chase down the passenger side? Is there some sort of a tone generator and an amplifier I can get to trace the wire?
Thanks for your help
Jack
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