Alternator
If your battery light is on, your headlights are dimming, or your car struggles to start, a failing alternator may be the reason. A mechanic tests your charging system and replaces the alternator so your battery stays charged and your electronics work reliably. Fixing it quickly keeps you from getting stranded.
Find a TechnicianCommon causes
- Worn alternator brushes or internal bearings
- Failed voltage regulator inside the alternator
- A loose, worn, or broken drive belt
- Burned-out diodes in the rectifier
- Normal wear from age and high mileage
Frequently asked questions
What are the signs of a bad alternator?
Watch for a glowing battery light, dimming or flickering lights, slow cranking, electrical glitches, or a dead battery that keeps coming back. A charging test confirms the diagnosis.
Is it the alternator or the battery?
They cause similar symptoms, so a mechanic tests both. The battery stores power while the alternator recharges it, and a quick electrical check tells you which part has failed.
How long does an alternator replacement take?
On most vehicles it takes one to two hours, though tightly packed engine bays can take longer. Your mechanic can give you a time estimate after inspecting your car.
How it works
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Get it fixed
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