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Hello. I have a 2000 coach with an electric cube heater on the driver side of the plumbing bay near the Headhunter water pump. It is controlled by a mechanical thermostat on the passenger side of the same bay. it stopped working (no power on outlet)

I thought it was the thermostat so I bought a new mechanical one and when I took out the old one to measure the line voltage I didn't have power in thermostat box. there are two wires...I thought one was incoming hot and the other was going across the bay to the switched outlet. 

I have a 110v breaker in back labelled "compt heater" which was on and I measured and it has voltage on it.

so, what am I missing?

either this is wired in a way I don't understand or I have something broken in a hidden location between the rear ac breaker and the thermostat box

any suggestions?

Thanks,

Don