[whited44]

When you say it quits charging, what is the voltage? I am asking because typical alternator behavior is the alt will charge at 13.9 or 14.0 right after the engine is started, and the chassis batteries are slightly discharged. As the chassis batteries top off and their internal resistance goes up a bit, the voltage will usually drop to 13.7 to 13.8 and hang out there.

If I don’t turn on the generator and flip the merge switch voltage will continue to keep going down and down below 12 volts. But I never let it go that low