LOL! Ya never know. I did end up getting in touch with the Thor people. As it turns out, if the switch on the fan between the sink and the dinette is turned on then that switch above the sink turns the fan on. If the local switch on the fan is not on the switch over the sink does nothing. I would never have guessed that one. Too bad Thor doesnt just publish all that kind of info in the owner manual section but they dont. They show not much more that the floor plan. But mystery solved. Thanks to everyone for the comments.
Andy
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