The battery could be bad if it did not charge while plugged in. Or it could be a blown fuse possibly. If you have a multi meter, next time you plug it in, check for voltage at the battery. It should read approximately 14 V while charging. Jerry.
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2005 GMC Sierra 2500HD, Duramax 2WD CC/SB
2013 Cardinal 3030RS full body paint
B&W Companion slider, air bags, EFI Live Custom tuning by So Cal Diesel