Alternator Replacement Cost: 6 Signs You Need to Replace it!

A faulty alternator can damage other electrical components of your car. Plus, it’s a safety hazard as a failing alternator can dim the headlights of your car, leading to compromised visibility. Let’s discover the common signs of a faulty alternator and alternator replacement cost in this blog post.

Along with that, we’ll also discuss why an alternator goes bad.

What is an Alternator?

An alternator acts as a generator, converting mechanical energy from the engine into electrical energy. When your car is running, the alternator spins, driven by the engine’s belt. This motion generates electric power, which is then stored in the battery. It is responsible for powering electrical components like your headlights, radio, power windows, and even the ECU.

How Much Does It Cost to Replace an Alternator?

The alternator replacement cost in the UK is between £275 and £700. Here are the factors that can affect the cost of replacing an alternator:

• Type of alternator: The type of alternator you choose for your car can affect its replacement cost. The choice is usually between OEM vs. aftermarket components, with the latter being the more affordable option. Plus, cars with start/stop and sophisticated electric systems may need specialised alternators, which adds to the overall cost.
• Car’s make and model: Your car’s make and model affects the alternator replacement cost. The parts and labour costs for high-end brands like Mercedes or Land Rover are significantly higher than those of economical brands like Ford and Toyota.
• Repair shop: The type of repair shop you visit also impacts the alternator replacement costs. The dealerships and highly skilled mechanics usually charge somewhere between £80 and £150 per hour for alternator replacement, whereas local mechanics will charge you almost half of that.
• Additional components: Along with the alternator, you might need to replace some cables and fuses. In the worst-case scenarios, major electrical equipment like batteries may also need to be replaced. In this case, the replacement cost of the alternator will far exceed these estimates.

What are the Major Causes of a Faulty Alternator?

Alternators can fail due to several reasons. Here are certain causes you need to be aware of:

• Wear and Tear: Alternators have a limited lifespan. Over time, the internal components like bearings, brushes, and windings may deteriorate. This wear reduces efficiency and can eventually lead to a failed alternator. There’s nothing you can do about it.
• Parasitic Drain: Installing aftermarket accessories or using high-power electrical equipment can put undue stress on the alternator. These parasitic draws can drain the battery faster than the alternator can recharge it. So, avoid them at all costs.
• Improper Jump Starting: Using jumper cables incorrectly can damage your car’s alternator. Therefore, it is important to cross-check the connections before jump-starting. Also, don’t jump-start your car very often. Instead, replace the battery if it’s weak.
• Broken or Worn Serpentine Belt: The serpentine belt is responsible for spinning the alternator. A worn, loose, or overly tight serpentine belt can damage the alternator bearings, which can lead to premature alternator failure.

6 Signs of a Faulty Alternator

You can save hundreds of pounds in accessory replacement costs by staying aware of these crucial signs of a failing alternator:

1. Battery Warning Light

Although a battery warning light on the dashboard can mean several things, it’s often a direct indicator of a faulty alternator. The alternator is responsible for charging the battery. If the light stays on, it suggests that the alternator isn’t functioning properly, leading to a discharged battery.

2. Dim or Flickering Headlights

When your headlights start to dim or flicker, especially when you turn on other accessories like the stereo or air conditioning, it could be a sign that the alternator is struggling to provide enough power. This usually happens when idling or driving at low speeds.

3. Difficulty Starting the Car

A slow cranking sound or difficulty starting the car, especially after the car has been sitting for a while, can be a symptom of a failing alternator. If the problem persists, you may eventually be unable to start your car at all.

4. Windows Take Longer to Roll Up

Compare the speed of the windows to how they rolled up in the past. If there’s a noticeable difference, it could be a sign of a failing alternator. If your alternator is failing, it may not provide enough electricity to run the window motors at their normal speed.

5. Corroded Battery Terminals

While corrosion on car battery terminals can occur for various reasons, it can also be due to a failing alternator. When the alternator isn’t charging the battery properly, it can lead to an imbalance in the battery’s chemical composition. This can cause increased corrosion on the terminals.

6. Early Battery Failure

Premature battery failure is also another sign of a failing alternator. Car batteries do have a fixed lifespan, but if your alternator is faulty, it may not charge the battery adequately, leading to premature battery failure.

Frequently Asked Questions

1. How long does an alternator last?

Alternators typically last between 8-10 years or approximately 80,000 to 150,000 miles, though their lifespan can vary depending on several factors. These include the quality of the alternator itself, the installation of aftermarket accessories, and the total load of the electrical system.

2. Does a faulty alternator affect the value of your car?

Yes, a faulty alternator will likely lower your car’s overall value when you sell it. A relatively new car with a minor problem might experience a 4-5% depreciation, whereas the impact on older cars may be less noticeable, with a 2-3% depreciation. Ultimately, it depends on the severity of the issue. If the alternator issue is minor, you may not lose any value at all.

Wrapping Up: Alternator Replacement Cost

In conclusion, a faulty alternator can lead to other electrical system issues and potentially expensive repairs. That’s why recognising the signs of a failing alternator is crucial to prevent further damage to your car’s electrical system and save hundreds of pounds in replacement costs.