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You should check each battery to make sure they are still good. If they are original, they are probably bad. Thor only warrants the batteries for 90 days! I bought a 2019 and had to replace the house batteries after 2 months. While your unit is a 2017, the batteries could be 2016's. After sitting on a dealer lot for months they have been pretty well abused.
Get a battery tester, disconnect all the wires and test each battery. Good luck
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