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From what I have found there are a few different reasons.
1. Loose connection to the battery.
2. Loose or bad serpentine belt.
3. Alternator is bad / going bad.
4. Your batter is needing replaced.
How old is the battery? If the case is that the battery is dead, then you are going to want to check the alternator also. Since it is trying to charge a dead or dieing battery, it is going to put a lot of wear on it and burn out the diodes inside the alternator.
I would say check the battery with a digital meter, and see what voltage you are getting with the car NOT running... and then check with it with the car running, this is when the alternator is charging or attempting to charge the battery. With the car running running should be some where around12.4-13.6 +/-
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