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Q: my battery light flashes while im driving and it messes with my lights on 2000 Mercury Cougar

it only happens when i drive and it messes with my lights and when i have the air on or heat it messes with it also
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on most vehicles, when the "Battery Light" Flashes or comes on, that generally means the Alternator is not producing enough voltage, meaning it may need to be replaced. If you have a digital volt meter, you can check the voltage at the battery while the car is running. It should be producing at least 12.8 volts.
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