Longrodvonhugendong

New to the thread. Yesterday i went to the gas station, everything was fine, came out and tried to start the truck. No power anywhere in the truck, no lights, no power locks, dash or radio doesn’t turn on. Even when i try to jump the battery there is no power. Took the battery out and charged it and it charged up just fine. Put battery back in and hooked up leads, still nothing. Confirmed that battery is fully charged with volt meter. Battery connections are tight. Ground wire is tight to battery and truck. 2016 GMC Sierra 2500hd 6.0L gas. Crew cab 6’ box