As it turns out, the problem was several corroded terminals on the 12 volt
distribution panel and a nasty looking 30 amp breaker. The panel isn't labeled which breaker is for what but I'm guessing the 30 amp breaker is for the A/C. There are lots of little electrical issues I'm discovering like the outside flood light that wouldn't work. The bulb was good but the problem turned out to be corroded terminals on the switch. Being a Florida coach with humidity and salt air, I'm finding this everywhere. With only 50K on it, the coach sat much more than it was driven. At least most all of this is easily repairable and doesn't cost much more than my time.