Dead Batteries Solution
I had all of the above problems with Coach and Chassis batteries. Rather than go to all that trouble with cut off switches and fuse pulling I bought a solar panel from O'Riley's. It was around $65 or so. I put it on the dashboard and slid it to the windshield in the center.
It comes with a long wire and battery clamps (one set) I made a Y connection and added a second set of clamps.
Hooked one set to the chassis batt and the other to the coach batt. Haven't had a dead battery since. BTW it is not in direct sun all day. Only gets sun in the mornings. It is not intended to charge the batteries but to keep them topped off.
Good luck.
Chuck
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