I have a 91 winnebago chieftain 25'. When i am plugged in everything works. Unplugged everything is gone, no step, radio, ac, headlights, etc. It will start and drive thats it. It is driving me crazy....
Your problem is with the coach batteries. Check the battery disconnect switch. Cycle switch, turn coach battery off then back on. check the circuit breaker adjacent to the battery disconnect switch.