not sure if you have diesel or not....at the foot or our bed, was a box with "light switch"...it is the cummins diesel engine block heater. In the elec compartment where your charging system is, we had a 110 volt outlet, with a plug, plugged into it...that was the engine block heater, and that switch operated that....................on our coach..but we are older....2002 Gulfstream Scenic Cruiser.........
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