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There are a number of reasons: 1. Your battery could be going bad. 2. Battery connections could be corroded or bad. 3. Alternator could be going bad. 4. V-belt driving the alternator could be bad or loose. 5. Other loose wiring.

There are a few auto supply stores and auto shops that will test your charging system for free and load test the battery. The easy checks are the connections and belt tension.

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Q: Batterylight comes on and off at times?
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