OK guys, here is the story. My wife went out the other night to roll the windows down on our 2003 trailblazer (6 cylinder), and left the key in the run position over night. Next morning I went to start the truck and well......dead battery. Charged it and tried to start the truck.....nothing. I have replaced the battery, ignition switch, checked the starter relay and double checked every fuse in both boxes. It's not the starter because I can jump the starter with a screw driver and make the engine turn over. Everything works inside the truck and all the lights come on just fine. I am stumped. Any suggestions??????