Barryman -
I'm not familiar with that particular model so just taking a guess here .....
Perhaps both switches are for the Hot Water tank --- one for heating with electricity (110v) and the other for gas/propane. If that is the case, then the one with the "lightning bolt" symbol would be for electric operation.
Again, just a guess.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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