That's a good idea and one I hadn't thought of. While fiddling around last night I noticed that if I jiggled the switch lever the blower would come on and off in the lower positions. Nothing on the high setting still. I believe using your suggestion I'll see a voltage fluctuation when I jiggle the switch. It seems to be my lot in life that the problem part is invariably the the one that is hardest to get to. That would be the switch.