Islander,
I believe the switch you are referring to is the electric water heater. There is an on/off switch right on the water heater tank that if its turned off it won't matter what you do with the black switch inside, so make sure both switches are off if you wish to use the electric heater.
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Gulfstream Sun Voyager
1999 Diesel Pusher M-8362
275 HP Cummins
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