dead

So basically ive nothing but problems with my duramax just out of the blue. First of all the batteries started dying and wouldnt hold a charge so after i figured out what was draining it, (a broken usb port i added, wouldnt turn off after shutting the truck off and was always giving constant...

went to add an extension cable to my juice monitor so i could put it up higher. anyways unplugged it, put the truck in first to pull my dash off, put it back into park went to start it and she was dead... any ideas?