. . .seems this "bad" battery could have ignited something?
Tom, Sure glad to hear everything worked out OK. Since it was only 1 battery, I would have to assume (Yeah, I know what @$#-u-me is) that it had to be a bad battey. Had a similar experience years ago in the 4106. Drove non stop from Springfield, IL to Englewood, FL. About 100 miles from home, Paula & the boys started complaining of smelling rotten eggs when in the bathroom (the batteries were under the bathroom in the bay). I was tired and not really thinking, I told them "look, it is just the holding tank and we are almost home". When I got out of the bus, I could see "steam" coming out of the battery compartment. Both 8d batteries were boiling. When I checked out the charging circuit, i found the regulator had failed and stuck at full charge. Not sure when this actually happened but we had been driving for approx 20-22 hours (I was a lot younger then). JackPS: Give Sis a hug from us