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Many thanks. I'm going to say your branch is pretty secure. I put a meter on the batteries and measured 5.4 volts. It was parked a week and I left a light on.
Apparently at that low a voltage two things happen. The isolator switch will not energize and no power flows to the batteries when the rig is plugged to shore power. I attached an external charger for a couple hours and was able to activate the switch and am now charging with shore power.
Next step will be to replace the AGM with flooded cell batteries. In researching best choices I came across ads for lithium and briefly gave that consideration until I saw the cost.
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