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Why choose the RAC for an alternator repair?
At the RAC, we've got over 125 years' experience helping UK drivers. We have the skills and knowledge to keep your vehicle running.
Plus, with RAC Mobile Mechanics, you can avoid the hassle of taking your vehicle to a garage when you need a repair. We’ll come to you, at your home or work.
RAC Mobile Mechanic
RAC Mobile Mechanic
At the RAC, we’ve got over 125 years’ experience in offering complete peace of mind to our members. We’re best known for our breakdown service. And now – our new RAC Mobile Mechanics are here to help make every day motoring easier. If you need a service or repair, they’ll come to you at your home or work.
Book an alternator repair
If your car’s battery keeps dying or electrical systems are acting up, it could be a faulty alternator. Your alternator should charge the battery properly, and if it doesn’t, you could need an alternator repair.
Vehicle diagnostic check
£99
For when you know something isn’t right, but you’re not sure what – our mobile mechanics are here to help.
Content Guide
Introduction
The alternator is part of your car's electrical system. Knowing what it does, what the signs are when something's wrong, and understanding when to replace it can help keep your vehicle running.
What is an alternator?
An alternator makes electricity for your car. It charges the battery and powers things like lights, radio, and air conditioning by turning mechanical energy into electrical energy.
Main jobs of the alternator:
- Charging the battery: Keeps the battery full of power.
- Powering electrical systems: Runs the car’s electrics while the engine is on.
- Regulating voltage: Keeps the voltage steady to protect electrical parts.
Common causes of alternator problems
There are a few things that can cause alternator problems:
- Wear and tear: Parts naturally wear out over time.
- Heat damage: Too much heat can cause parts to break.
- Electrical issues: Bad wiring or connectors can make it fail.
- Fluid leaks: Oil or coolant leaks can damage the alternator.
- Overloading: Using too many electronics can strain the alternator.
Regular check-ups and fixing problems early can help your alternator last longer.
Symptoms of a bad alternator
Knowing the signs can help you avoid more damage. Common signs include:
- Dimming or flickering lights: Lights may dim or flicker, especially when the engine is idle.
- Battery warning light: The battery warning light on the dashboard may turn on.
- Electrical failures: Powered windows, seats, and other electrical parts may work off and on or stop working.
- Strange noises: Grinding or whining sounds from the engine area can mean something’s wrong.
- Dead battery: A bad alternator can make the battery drain fast, meaning more jump-starts to get your car going.
- Hard to start the car: The engine may be slow to start, or not start at all because of a weak battery.
Should you repair or replace your alternator?
If you’re having problems with your alternator, you can repair or replace it. The choice depends on how bad the damage is and how much it will cost.
- Alternator repair: Fixes parts of the alternator. This is usually cheaper but may not work if the alternator is very damaged.
- Alternator replacement: This is when a mechanic puts in a new alternator. It’s usually better for when they're old or badly damaged.
A professional mechanic can help you make the best choice.
Alternator repair cost
The cost of repairing an alternator depends on the type of car and how bad the damage is. Small repairs, like replacing the brushes, may cost less. Bigger repairs can be more expensive.
The cost of replacing an alternator depends on a few things:
- Type of car: Different cars need different alternators, affecting the price.
- Type of alternator: New alternators are more expensive than rebuilt ones.
- Labour costs: Rates vary based on where you are and who does the job.
Getting quotes from several mechanics can help you find the best price.
Keeping your alternator in good shape is important for your vehicle. Knowing the signs of a bad alternator and fixing it quickly can help avoid bigger problems and big repair bills. Whether you choose to repair or replace it, seeing a mechanic will help keep your car running well.
Frequently Asked Questions on car alternator
Driving with a bad alternator isn't a good idea. A failing alternator can make the battery drain fast, leading to a breakdown. Electrical parts may also stop working, which can be unsafe. It’s best to get the alternator checked and fixed or replaced as soon as you can.
When the alternator fails, the battery won't charge and will drain. This can make the car stall and prevent it from starting. Electrical parts like lights, radio, and power windows may stop working. Get help from a mechanic right away to avoid more damage.
Alternator reconditioning means fixing an old alternator by replacing worn-out parts. This can be cheaper than buying a new one, but it may not last as long as a new alternator.
The cost of an alternator varies by the type of car and the quality of the alternator. To know exactly how much, you should talk to your local mechanic.
Yes, alternators can be repaired if the damage isn't too bad. If the alternator is very damaged, it may be better to replace it.
Replacing an alternator is often worth it if the alternator is old or very damaged. A new or rebuilt alternator can work better and prevent future problems. Talk to a mechanic to help make the best choice.
Alternators usually last between 80,000 and 150,000 miles. But it can vary based on where and how you drive, and maintenance. Regular check-ups and fixing problems early can help it last longer.
Some alternator repairs or replacements may be covered under the car’s warranty, especially if the car is still new. Check your warranty details or talk to your mechanic to see if it's is covered.
They’re often not covered by standard car insurance policies because they're thought to be part of your vehicle's upkeep. But, if it's damaged in an accident, it might be covered.
You need an alternator replacement when it's very damaged or has worn-out parts that can't be fixed. If it's not keeping the battery charged or causes electrical issues, you'll need to replace it.
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