I had that happen several times with my 01 Ultra. Even after the factory recall to replace the circuit breaker, it happened again. Heat causes that breaker to 'open' and fail.
I ended up taking the breaker and it's holder, and relocated it under the right side cover with all the other electronics...No more problems after several more years.. That said, others told me that they replaced with circuit breaker with a Maxi Fuse. ( I would have but was given bad info from a dealer...they said I couldn't do it and I took their word for it...) Bottom line, get that circuit breaker away from it's original position under the seat, right behind the rear jug or go to a Maxi fuse that is not prone to heat damage/failure.