Welcome to the forum - enjoy your new rig.
Were the batteries fully charged when you noted the issue?
Wonder if the dealer knows the previous owner - that may help with your trouble shooting.
Give it a good walk through with the dealer and document all things that need to be fixed.
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RV - 2017 Avalanche 320RS
TV - 2011 Chevy Silverado 3500HD LTZ CCLB Duramax SRW 4X4
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