Bad Alternator vs Bad Battery (How to Tell the Difference at Home)
July 29, 2026
“Replaced the battery last week. The car still died on me yesterday.” I hear that one a lot, and almost every time, it’s textbook bad-alternator behavior, not a battery problem. The battery starts the car. The alternator keeps it running and recharges the battery while you drive. Two different parts, two different failure profiles, and the symptoms overlap just enough at the start to send people to the parts store for the wrong fix. Good news: you can sort it out in your...
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