If it has a red light on it, it is to turn on the water heater to electric use. Now I also have another switch simular to that with an amber light on the bed box, but that one is for the engine block heater.
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2002 Gulf Stream Scenic Cruiser 38'
Neway Freightliner chassis, 2018 Buick Envision Ess.
3126-E Caterpillar 330 hp
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