Hello paulschwalm: My name is Roger and I will help you. If your jeep is only charging 12.75 volts? You should be charging more. 12.5 is bear minimum voltage. Will not sustain lights and heater operations.Anything less than 12.5 volts the computer will start shutting down components to protect the battery and the memory of the computer. I would have the alternator tested as it should produce 13.0 to 14.5 volts Should you need further help please just ask. Please rate the answer. Thank You for using and trusting Fix Ya.Roger
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