Skip the auto shop - Our mechanics make house calls
  1. Home
  2. Articles
  3. How Long Does an Alternator Belt Last?

How Long Does an Alternator Belt Last?

alternator belt

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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

P2159 OBD-II Trouble Code: Vehicle Speed Sensor B Range/Performance
Diagnostic Trouble Code (DTC): P2159 P2159 code definition Vehicle Speed Sensor B Range/Performance...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...


Related questions

Q: What direction are threads on harmonic balancer bolt?

The bolt is threaded counter clockwise. It is usually torqued extremely tight. Generally air tools are required to remove this bolt.

Q: It will not turn over and start

Because you left the car running but it died anyways, this tells me that this is not the battery at fault. The most likely culprit is the alternator. Many people are not aware, but testing an alternator is really easy....

Q: No Start only clicking, new battery

This is a common sign of a faulty starter solenoid. The starter solenoid is located on the starter and has internal electrical contacts that transmit electricity to the starter. When this fails, it may cause a clicking sound and will...