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I would think the alternator is the culprit, You can take your car down to an Advance Auto Parts, O'Reilly, Autozone (or the like) where they will test it for free. They can also check your battery, which may be the culprit, but I doubt it. It sounds like the internal regulator is going out (or you might have lost one or more diodes) on the alternator. ...


Yes, your alternator is the culprit as the engine is running on battery power. Before you purchase a new one, though, take it to your local Autozone, Pepboys, Checker, or the like and have them test it. They will do it for free. I take it since you didn't say the steering became hard, that the serpentine belt is still running correctly. If it was difficult ...

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