I have a 2001 GMC with 5.8 ltr engine. The truck runs fine, when its running.
If I leave it sit up for 2 or 3 days the battery is dead, I mean dead, no lites, horns, etc. I brought the old battery in for a test and they said it was bad,-' OKay, truck runs fine for a month and the same thing happens. Bring battery back to see if I just happened to get a bad battery. Shop tells me this battery is bad, gives me a new one. 5 days later same same thing. I checked lights, raido, ets made sure nothing was on. Only thing different is the Radio will not shut off when I open the door, I have to turn it off. I am the only one who drives the truck.
Any Ideas?
Thanks