Alternators

An alternator is a major part of a vehicle’s charging system, that’s why it’s important to understand what they do, which alternator to buy and exactly when they need replacing. We stock alternators from a range of leading brands including Bosch, Lucas, RTX and Starline. Speak to one of our colleagues who’ll help you find the right alternator for your vehicle.

What does an alternator do?

Energy created by the engine’s crankshaft is converted from mechanical energy to electrical energy by the alternator. The process creates electrical energy which charges the battery, and begins with a rotor which sits within the alternator and spins as the engine is turned on. The process itself is called induction, and is the reason behind all the working electrical & lighting components on your car.

One of the most important components in the car alternator is the voltage regulator, which is responsible for making sure the current flow to the battery remains steady. As with all electricals, multiple factors may cause the charging system to fail, such as worn, damaged cables or a drained battery.

How long do alternators last?

It is difficult to say exactly how long an alternator will last as it depends on individual factors, but it is expected to have a lifespan of around 80,000-150,000 miles.

Signs of a bad alternator

Common warning signs to look out for when you need an alternator replacement include:

Battery warning light alerts
Dim, extremely bright, or flickering exterior and interior lights.
Vehicle won’t start or stalls frequently.
Accessories not working as usual e.g. windows taking longer to put up or down.
Growling, whining or whirring noises.

Where to buy alternators

At Halfords, we have a huge range of alternator parts for all car makes and models. The alternator cost depends on the make, model and specification of your vehicle. To find suitable products for your car, enter your registration number into the tool provided and we’ll match you with the products that fit your car. Once you’ve found the products you need, use our convenient click & collect service to get hold of your products sooner. Prefer to have them delivered? Opt for delivery at checkout. If you’re still unsure which products you need, head down to your local Halfords store where one of our colleagues will be happy to help you out.

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