Craig,
I had a similar thing happen to me when I put back-up lights on my PV and, with my usual brilliance, hooked them up without a relay. The lights came on once and that was it. When I opened up that aluminum box, I found the little tickler spring melted into a sadly drooping position, although, not grounding on anything. I didn't even try to straighten it, but was able to get a new contact with spring at the Volvo dealer's. It's a bit of a job to get it pushed into position in the hole, but I managed, so it can be done. You might want to get one to have as a spare.
Bob S.