What makes a GMC Sierra 1500 shut off?
What makes a GMC Sierra 1500 shut off? The truck runs great until I turn on the headlights. It brings my battery gauge way down and draws enough power from my fuel pump that the truck will spit and sputter then shut off after a couple of minutes. Keep the lights off and it runs great. Changed the battery and had the alternator tested 5 times. Why is the battery on my GMC Sierra 1500 dead? There were no lights or devices left on after the previous time the truck had been used. Something is drawing power from the battery...