Okay, so do you think If I took another battery with me and Tried it that would work? Ive had the Jeep about a year, and its had the same battery. Im not sure how long he had it before that, but I fully charged the battery the night before, and it seemed to be fine. It started and ran just fine. Im thinking maybe it will be the Alternator? What do you think about the Alternator? OR how can you tell the difference between the two when its bad?