got a 99 dwg, occasionaly the main circuit breaker trips randomly several times in a row, turn ignition switch off for few seconds and it resets, trips again after about 10 secs. repeat this 4 or 5 times.
then all is good till next time i take it down the road.
checked large black wires going to and from the circuit breaker, no bare spots, nothing.

??????

 

I had the same problem, until I replaced battery. Now everything is fine.