[Carl n Susan]

Originally Posted by bwright

Any chance this is the breakers you are talking about?

Those are it. But it appears someone has re-wired from the normal stock system. Normally, the 12V from the battery goes to a 50 amp breaker on the Bat side. A jumper goes from the same post (Bat) to another 50 amp CB again to the Bat side. On the second 50 amp CB, the wire to the pump and the fuse panel come off the Load side. This is the 50 amp CB that fails as it is the one carrying the volt/amperage for the pump and the fuse panel. But that is in a normal wiring setup.

Here it appears the 12V battery wire goes to the right hand 50 amp CB on the Bat side. But the wire to the fuse panel *AND* the wire to the pump are coming off the Load side. This despite the fact someone wired an 80 amp CB in the wire from the 50 amp CB to the pump motor. In effect, you have a 50 amp CB protecting the circuit with an 80 amp one behind it which is useless (the 50 will trip long before the 80).

In any case, the right hand 50 amp CB has failed and needs to be replaced. Take the time to wire it correctly when you replace it so the 80 amp breaker is actually in control.

Here is a link to one of many Threads on the 50 amp breaker. This one, as do others, have pictures of the "normal" wiring as it comes from the factory. https://www.montanaowners.com/forums...ad.php?t=72657

The Search function will uncover many more Threads on thjhis topic.