I need advice on a battery drainage problem that I can’t get fixed with a 1995 GMC Sierra 3500 Dually 2 wheel drive 350 engine truck that I own. If I don’t crank this truck at least once a week the battery is dead. I’m on my 3rd new battery (under warranty) that’s only 2 weeks old & it’s dead already! Took the truck with the new battery to a body shop for work & when ready to be picked up, the battery is dead. It’s been in & out of shops & no one can fix it. They tell me it’s nothing wrong with the truck, it just needs to be cranked once a week! There’s got to be a problem! Please help!