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It may be both. If you jump a car that has a dead battery, the battery light keeps coming on and off while driving. You can check to see if it's the battery by getting a volt meter and starting your car and then attach those clips to the positive and negative terminals on the battery. If the battery doesn't charge or it loses a charge when you turn the car off, then you need to go get a new battery and most likely you need your alternator checked. But 9 times out of 10 it's the battery.
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