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Can a bad alternator ruin a battery?

My car’s battery unexpectedly went bad. After I replaced it with a brand new one, that one died, too! Can a bad alternator ruin a battery?

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Melanie Mergen · Updated on
Reviewed by Shannon Martin, Licensed Insurance Agent.
Oh no—sorry to hear that happened! Can a bad alternator ruin a battery? Yes, a bad alternator could prevent your vehicle’s battery from recharging while it runs, leaving you with a dead battery the next time you try to start your engine.
In addition to a dead battery, here are some other signs you might have a bad alternator:
  • Frequent engine stalling
  • Your check engine light is on
  • Dimming cabin lights or headlights (especially if they brighten and dim with your RPM)
  • Burning smell
  • Groaning or screeching noises
If you suspect you have a bad alternator problem, having your mechanic take a look is a good idea.
As you’re looking after your car, it might also be a good idea to take another look at your
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