At the beginning of this I said I had a felling that I would feel a little foolish when I figured it out. Well I do.
As some suggested I took the cover plate off the switch. I verified that the mystery switch had 12.9 volts feeding it and that the switch worked and was sending 12.9 volts to something.
The wires were color coded. The hot wire was brown and switched wire brown with white stripe. I dug out a wiring diagram. Brown hot wire and brown and white striped switch wires were designated as bathroom lights.
That really narrowed down the area to the bathroom and it had to be a light. I turned that switch on an off a hundred times over the past few days and it did not turn any light off or on.
There is a florescent light in the hall between the main room and the bedroom/bathroom. Upon examination I noticed it had a separate switch on the side of the light. I turned it in the other direction and voila the switch now turned the light off and on. It was kind of a dahhhh moment.
Thank god for color coded wires and wiring diagrams. I never had a use for that light in the three months I've owned the coach.
Thanks for all your suggestions. They helped me eliminate some things and eventually figure it out.