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Good afternoon and welcome to JustAnswer!!My name is ***** ***** I have worked for a Chrysler-Dodge-Jeep dealership for 19 years and I will do my best to help.
It sounds you have a bad cell in the battery and I would have the battery load tested to properly test it and any local parts stores will do this free of charge...
To test the alternator you will need a multimeter set on DCV and start the engine, then connect the red and black leads to the battery and see if it's charging 13-14v.. If yes then you don't have a alternator issue..
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