How Long Does an Alternator Belt Last?

Your car’s alternator is what delivers energy to your vehicle’s battery. It works by means of converting mechanical energy to electrical energy, taking power from the engine’s crankshaft and delivering it to the battery where it is stored. The alternator connects to the crankshaft by means of a belt – either a V-belt, or a serpentine belt. With a V-belt, only the alternator is driven. If your vehicle has a serpentine belt, then other components are also powered. If the alternator belt breaks, then the car battery does not receive a charge, and accessories may not operate properly, if they work at all.

The alternator belt is constantly working, from the time you start your vehicle until the time you turn it off. Like all other automotive belts, it is made of rubber, and that means that over time, it can deteriorate. Usually, you can expect your alternator belt to last 3-4 years. You should have it inspected regularly – a good rule of thumb is to have your mechanic check the alternator belt whenever you have an oil change.

Signs that your alternator belt needs to be replaced include:

  • Fraying, cracking or looseness
  • Headlights and/or interior lights flickering or dimming
  • Engine will not turn over
  • Car stalls
  • Accessories do not work

If you notice signs of wear on your alternator belt, or you experience any of the symptoms noted above, you should have a qualified mechanic check the belt. Have the mechanic replace the failing alternator belt to eliminate any further problems with your vehicle.


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Recent Alternator / Serpentine Belt Replacement reviews

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Greg

22 years of experience
333 reviews
Greg
22 years of experience
Honda CR-V L4-2.4L - Alternator Belt - Goodyear, Arizona
Very dedicated and did a great job with a complex repair Thanks and well done saving me $500 over other bids
Honda Civic - Alternator Belt - Chandler, Arizona
Greg was friendly, communicated through the entire process. Quick and professional, I'd without a doubt recommend him for your repair needs.

Pierre

9 years of experience
308 reviews
Pierre
9 years of experience
Ford Escape L4-2.3L - Alternator Belt - Cambridge, Massachusetts
Kind, knowledgeable, and clearly a talented mechanic, this may have been the best car-related experience of my life.
Infiniti FX35 - Alternator Belt - Lexington, Massachusetts
Pierre did a great job on this project. Found him knowledgeable and helpful all round. Would highly recommend him for any auto mechanical projects.

James

23 years of experience
99 reviews
James
23 years of experience
Honda CR-V L4-2.4L - Alternator Belt - Lithia Springs, Georgia
James was very professional and friendly and complete the work in a timely manner. We would highly recommend James and will definitely use his service again.

John

10 years of experience
49 reviews
John
10 years of experience
Lexus ES350 V6-3.5L - Alternator Belt - Chula Vista, California
John was great. He showed up early, took care of the work in a timely fashion, then explained everything to me once all the work was done. I would definitely use him to work on my Lexus anytime.

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