Malibu,,,, I had a 90 Bounder that had the same problem, I found the problem to be in the switch itself. If you've checked all the fuses which all proved to be good, then I'd look for voltage directly at the switch.
Also are there any additional fuses in your coach panel, I believe my Bounder had some in there as well.
Hope this helps...........
05 Southwind 37C