Okay so about 6 months ago my Tj started acting a little funny and it would randomly go dead sometimes AFTER BEING PARKED and I would have to get a jump from someone to start it, but RIGHT when the jumper cables would get attached it would start right up. Also, everytime I did this my battery gauge would shoot all the way to the top within 2 or 3 mins of me driving, passed the 19 on the gauge. Even though it probably wasnt the smartest idea, since I was just driving in town, I assumed this was a technical error and would just continue to drive until I got to my destination. That went on for a couple of weeks, but then it randomly stopped. I dk why. But now here I am 6 months later, in college, and the jeep being my only vehicle, and it decides to do it again. Whenever it goes dead, it goes COMPLETELY dead. No dash lights, no nothin. I can very faintly see the lit up handbrake light in my dash, but if I push on the brake pedal or something it goes out. Also, when it did it for the first time the other day, I got a jump from my brother no problem, but about 2 mins later it went dead at a redlight WHILE RUNNING, but then once again, once jumper cables got hooked to it, it instantly started up right when they got connected. Could this be fixed just by buying a new battery? Thats what I would assume but that would not be the cause of it going dead while running at a red light would it? Thanks for any advice guys. This might be a dumb question but I'm not all that mechanically inclined yet so I have no idea about all of this stuff haha.