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if your alternator is only 5 mon old you could have a bad connection on the alternator that isn't makeing good contact , or it could have a bad stator i would take the alternator back were you got it have them test it if its bad and it has a bad stator it might have warranty on it and they will replace it .

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Q: Got a new alternator about 5 mths ago Now the check engine light came on The car stalls and cuts off and the battery light comes on What could this be?
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