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Hello. Welcome to Just Answer. Please allow me to assist you. Anytime the alternator warning light comes on, this is a visual indication that there is something wrong with the charging system. This could be a loose or otherwise damaged drive belt, or something inside the alternator is malfunctioning. Normally, when the light comes on, the output voltage may not be enough to power the electrical drain to keep everything running AND charge the battery. The recommendation I have for you would be to take the vehicle to a shop (any shop that can do alternator testing is OK, it does not have to be an expensive Jeep service dept). Get the alternator tested. The test is reasonably inexpensive and should not take more than 15-20 minutes. The alternator output voltage (at idle) should be 13.8 to 14.4 volts. The amperage output should be above 50 amps at 2000 rpm with a full electrical load. If either of these specs are not met, a replacement alternator would be the cure to your issue.
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