Old-Biscuit wrote:
IF it was the in-line fuse or circuit breaker how does it work when connected to tow vehicle?
The main breaker/fuse is next to and protects the battery from a dead short. The Tow Veh. connects downstream of that, prob in the fuse panel.
Mine is just a simple 30amp auto breaker with two bolts and wires nutted down. I would disconnect the TowV and shore power, put a few lights on and then short across the bolts (i.e. with plyers) to see if they come on, if they do, your breaker is faulty and needs replaced.