It's very appropriate for TreeSeeker to bring up automatic reset circuit breakers because they can cause considerable confusion if you're not aware of them and don't consider them. They can lead to a situation where a electrical circuit stops working and then, after a short while, starts working again. (Of course, as discussed recently, a loose connection could also cause this behavior.)
I suspect the one on TreeSeeker's coach battery was an aftermarket addition, because automatic reset circuit breakers weren't very common OEM equipment decades ago. They've become very common, and even ubiquitous, in late model vehicles. (Based on this, I believe a previous owner or mechanic was unusually proficient.)
Important note: If an automatic reset circuit breaker trips once or infrequently, there's probably no cause for concern. If, on the other hand, it trips regularly, you likely have a problem in your electrical system and should investigate.
