I have a 2006 Winnebago Voyage 32V on a Workhorse chassis. New auxiliary batteries, new disconnect switch and still no power. I've checked all the fuses, breakers, etc and all good. Everything works ...
Suggest you Google auto reset circuit breaker - doesn't really look like std breaker or fuse but most RV's have them usually located near the batteries. When they go toes up they essentially take the batteries "off line" which in most rigs means that you get DC via your converter when hooked up to shore power but zip when your not.