Alternator replacement cost

By Fakhri · Last reviewed November 6, 2026

Quick answer

Replacing an alternator usually costs about $350 to $900 in the US, or about £250 to £800 in the UK, parts and labor included. A common family car sits at the lower end; newer cars with a lot of electrical equipment, luxury models and hard-to-reach alternators cost more.

Typical cost$350–$900£250–£800≈ €320–€810≈ A$530–A$1,400alternator replaced at a garage, parts and labor

Price at a glance

What pushes the price up or down

Your car. Newer cars with lots of electrical features can need an alternator costing up to almost $1,000 for the part alone. Water-cooled alternators (fitted to some BMW models) and mild-hybrid starter-generators cost more again.
New or remanufactured. In the US, a remanufactured unit typically costs $200–$400 and a new original part $400–$900 or more. In the UK, a new alternator for a mainstream family car costs about £150–£350, a reconditioned one about £100–£200.
How easy it is to reach. On some engines the alternator is right at the front; on others, parts have to come off first. Garages quote anywhere from about 1 to 3.5 hours of labor.
Where you go. Dealers charge more per hour than independent garages, and usually fit original-brand parts.
Extras. The drive belt (serpentine or auxiliary belt) is often replaced at the same time, adding roughly $50. If the battery has been run flat repeatedly, it may need replacing too.

How to avoid overpaying

Get the charging system tested first. A weak battery, a corroded terminal or a slipping belt can look like a dead alternator. A charging-system test takes only a few minutes.
Ask about a remanufactured unit with a warranty. It is the biggest single saving on most cars.
Ask whether the price includes the belt, and whether the old belt actually needs replacing.
Check the core charge. In the US, the price may include a refundable core charge that you get back when the old alternator is returned.
Get two or three quotes for your exact car, including parts, labor and tax.

Signs your alternator is failing

The battery warning light comes on while driving (see battery warning light).
Headlights or dashboard lights dim or flicker.
Electric windows, the radio or the heater fan work slowly or cut out.
The car starts after a jump-start but dies again soon after.
A whining or grinding noise from the front of the engine, or a burning rubber or electrical smell.

DIY or garage?

Questions drivers ask

How do I know it is the alternator and not the battery?

A battery that keeps going flat can be either. A quick check: with the engine running, a healthy charging system shows roughly 12.3 to 14.4 volts at the battery. Lower than that points to the alternator. A garage can test both in a few minutes.

Can I drive with a failing alternator?

Only for a short distance. The car runs on battery power alone until the battery is drained, then the engine can cut out, sometimes in traffic. If the battery warning light comes on while driving, head straight to a garage or somewhere safe to stop.

Is a remanufactured alternator good enough?

Usually, yes. A remanufactured unit from a reputable brand, with a warranty, costs much less than a new original part and is fine for most everyday cars.

How long does an alternator last?

Many last 7 to 10 years, or roughly 80,000 to 150,000 miles. Heavy electrical loads and lots of short trips can shorten that.

General information only. Every car is different: check your owner's manual, and if anything involves brakes, steering, tires or a burning smell, have a qualified mechanic look at it before you drive on.