I have no idea what jeep model, or year you have, but I delt with this type of thing almost all winter long. I had to jump start the jeep every morning. I dont quite understand why, but after much trouble shooting, I replaced the dist cap, wires, and coil and havent had to jump it yet, my volts on the volt gauge also went up from around 11.5 to 13.5. My alternator checked out ok too, so not quite sure why these parts helped keep the bat charged, but the prob is gone.