How Much Does It Cost to Replace an Alternator?

Ellie Dyer-Brown, 3 months ago

2 min read

  • Cost
  • Alternator
A car alternator.

WhoCanFixMyCar discusses common alternator problems and how much it costs to replace one.

The alternator performs a crucial job: keeping your car battery charged. You can expect it to last between 80,000 and 150,000 miles (roughly eight years), but your driving style and where you live can impact this distance. Some alternators last the lifespan of a car.

The average price of an alternator repair is £438.61, according to WhoCanFixMyCar's data.

Read on to find out how to spot the early signs of alternator failure and how much the average price of a repair varies between different car manufacturers.


How does an alternator work?

Common signs of alternator problems

The average cost of alternator repair by manufacturer

How does an alternator work?

Alternators convert mechanical energy into electrical energy that is stored in the battery. When switched on, your car powers a drive belt resting on a pulley attached to the alternator. 

Diagram of an alternator.

The pulley turns the rotor shaft of the alternator, spinning a set of magnets inside a coil, which creates an alternating current (AC) in the stator. From there, the current is channelled into the alternator's rectifier, where the AC energy is converted into DC energy, activating the car's electrical systems.

Learn more about how alternators work in this guide.

Common signs of alternator problems

This guide provides more advice about what to look out for.

An old alternator in a car's engine

Several of these symptoms can also be caused by issues unrelated to the alternator. If you have any doubts, the mechanics on our network are happy to provide advice.

The average cost of alternator repair by manufacturer

The average price of an alternator repair on WhoCanFixMyCar varies between different car makes.

Average Cost of Alternator Replacement by Manufacturer

If you're looking for quotes for alternator repairs from reliable garages, WhoCanFixMyCar is here to help. Enter your registration number, and we'll find you a range of quotes from garages and mechanics in your area.

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