My guess is the water heater switch. In a lot of the smaller RV's, that's a popular spot for the water heater. The water pump would be the other answer, but you would hear that right away if you turned it on, provided the fresh water tank was full.
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Ed and Sharon
2010 Wildcat 28RKBS
2019 Ford F-250 XLT - AWESOME Truck!
Retired AF MSgt
I thought I was wrong once, but I was wrong!
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