> Tom,
> There was a cause for the breakers to trip. By the way it is most common
> they don't appear tripped so you did exactly the right technique.
>
> You need to suspect the adapter plug, your extension cord if using, or
> your outlet the trailer is plugged into. >
I once had to trace the same kind of problem.
It turned out to be a surge protector that had gone bad on the line.
Hunter