Multi meter
I've had 3 different MH's over the years and at some point and time I've had a similar issue. One time it was the storage switch switch and one time it was a lose wire connector (wire nut). I found 1 issue was when I was on shore power using a 15 amp converter. It apparently wasn't enough to have my home type refrigerator (which you can't turn off, only unplug) and keep the batteries up. It burnt out a fuse in my inverter. I put in a 30 amp system and haven't had a problem since.
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