This morning my truck turned on no problem, but when i got to work the start wasn't all that great. I pulled the battery cable off and the truck died so im guessing its the alternator. I jump started the truck but even with the truck on the windows wont work. Could it be the lack of power on the battery thats causing this even though the truck is on?? Or could i have burned out a fuse jump starting the truck?? I left the truck on for about 30-40 minutes turned it off and the battery is dead again. Alternator??