Man, I'd check all my switches and I'd also search the wiring (especially the hot wire) for a blown fuse. I volt meter will do the trick for you. Also, if you're hard wired into your boat's fuse box, be sure and check it out, as well.

One other thing. IF you're hard-wired, your wiring could be grounded where it goes through a metal crossmember etc.

Wishin' you the best on this deal. I know it can be frustrating.

aj