On our present Gulf Stream coach and our previous coach, that switch is the switch for the 110 volt electric for the water heater element.
To verify this, find your electric distribution box that has the 110v circuit breakers, turn the switch on so the red light is on at the switch, go to the breaker box and locate the breaker for the hot water tank, the legend on the box should be marked telling you which breaker it is, turn the breaker off and the switch light should go off.
I recommend that you have water in the hot water tank before doing this or just have the switch on momentarily so that you do not burn out the element with no water in the tank. Never leave the switch on without water in the hot water tank.
Ron
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