Jack, you can pick up a tone injector and signal tracer, also called tone and probe, at major home improvement stores or a store such as Sears. I have 120 volt lines running both in the overhead raceways and in the floor raceways. Since I have basement airs, the wires are run in the floor raceways. It is likely that your roof airs would be run through the overhead raceway, likely on the same side of the coach as the power panel.
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