What Does an Alternator Do?

Car alternator

An alternator sends power to the car’s electrical system while the car is running. While many drivers think the battery powers the car, it’s actually only used to start it. The alternator acts as a generator, using gas as its source of energy. To learn more about alternator services and alternator information, visit the service center at Tulley BMW of Manchester!

Common Alternator Problems

Concerned that your alternator is on its last legs? If you notice the following symptoms, bring your vehicle to Tulley BMW of Manchester near Londonderry:

  • Battery warning light appearing on the dashboard
  • Dim headlights or interior lights
  • Burning rubber smell under the hood
  • Devices not charging
  • Whining or screeching sound after the vehicle has started
  • Unable to start

Failing Alternator vs. Battery

Often drivers will mistake a failing alternator with a failing battery. The best way to find the issue is to wait until the vehicle is unable to start and needs a jump. Once you jump start the engine, remove the jumper cables. If it dies immediately, the problem is likely the alternator. To have a certified technician take a look, schedule a service appointment at Tulley BMW of Manchester near Bedford.

Car alternator and belt up close

How Long Does an Alternator Last?

Most alternators last between 80,000 and 150,000 miles, or about seven years. However, some factors can cause your alternator to wear out prematurely:

  • Alternator quality
  • Driving conditions
  • Power drain on the alternator

How Much Does it Cost to Replace an Alternator?

Because different cars require different alternators, it’s impossible to say exactly how much your alternator will cost. However, you can always contact Tulley BMW of Manchester for an estimate on the alternator for your particular model. Our parts department is fully stocked with genuine OEM parts for a perfect fit. On top of that, our technicians have the training and experience to install the part correctly. We also offer parts specials to help you save more on what your vehicle needs.

Car alternator and belt

Visit Tulley BMW of Manchester for a New Alternator

If you’re planning to replace your alternator yourself, visit the parts department at Tulley BMW of Manchester for the part you need! We always have OEM BMW parts and accessories on hand. And with our available parts specials, you can trust you’re getting the quality parts you need for a sensible price. Have questions in the meantime on anything from brake pad lifespan to suspension replacement? Contact Tulley BMW of Manchester!

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170 Auto Center Rd. • Manchester, NH 03103

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Tulley BMW of Manchester

170 Auto Center Rd. Manchester, NH

Phone: 603-644-2691



Phone: 603-644-2691

170 Auto Center Rd. Manchester, NH


Phone: 603-644-2691

170 Auto Center Rd. Manchester, NH


Phone: 603-644-2691

170 Auto Center Rd. Manchester, NH
42.950321 -71.436996
Tulley BMW of Manchester 42.950321, -71.436996.