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Next time you go to the camper I would take one battery and connect it to see if it works. The fact that it works off the generator says the thermostat is OK.
The only change here seems to be the power pack. It could be a ground issue. I assume you are connecting the power pack to the battery cables.
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Jim B
2017 Lariat F-350 FX4, CC, SB, 6.7 PSD 4WD
2018 MONTY 3731FL, at our private winter site in GA
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