Updated at: 25-03-2022 - By: Lucas

Do you ever find yourself stranded on the side of the road because your car won’t start? Well! Terrifying, really.

Batteries and alternators both have their own set of issues. If you notice dim headlights, it’s time to check your car’s alternator.

If you don’t, it can leave you helpless. If you suspect a problem with your alternator, the best course of action is to have it replaced.

Consequently, the cost of replacing an alternator is a legitimate concern. As the cost depends on the model, make, and condition of the vehicle.

Labor and parts will add up to between $500 and $800 when replacing an alternator’s components; this means you may expect to pay anywhere from $150 to $400 in total.

Alternator Repair Cost

Labor Cost To Replace Alternator-2

According to auto specialists, estimating the cost of an alternator replacement is a difficult undertaking. Alternator replacement costs are not set in stone.

However, several variables come into play, such as the automobile model you drive, where you buy an alternator from, and the quality of the alternator itself, which can be new or old.

Checking the amperage needed to charge the battery and power other components can help experts estimate the cost of repairing your vehicle.

Alternator repair costs can vary depending on whether or not you choose to do it yourself or have a mechanic do it for you.

Mechanics are the best choice because they are trained professionals with access to all of the necessary equipment.

What Is An Alternator?

A car’s alternator uses engine mechanical energy to generate electricity, which it then uses to power the vehicle’s battery and other electrical components.

The alternator generates this power, which in turn powers the vehicle.

As its name implies, an alternator creates alternating currents (AC). There are two types of AC power: alternating current (AC) and direct current (DC).

Because it generates more voltage, AC electricity is more efficient in automotive engines than DC power.

4 Symptoms That Your Alternator Needs To Be Replaced

The car will suggest in a variety of ways based on the underlying causes of the problem.

If your car won’t start, or if you suspect that your alternator is in need of repair, you may want to consider replacing it.

Alternator replacement is necessary if you notice any of the following symptoms.

1. Noises From The Engine

Engine squeals and other strange noises can result from a constrained alternator.

Try to figure out where the noise is originating from. In order to convey to your mechanic the nature of the problem with your vehicle, pay close attention to and retain memory of the noises you hear.

When a mechanic receives information concerning the engine’s sounds, he or she will know where to begin.

2. The Vehicle Not Starting

Getting a car started is not an alternator’s job; the battery does it. When the engine is operating, the alternator charges the battery.

There may be an issue with the alternator if the battery is dead, and the vehicle will not start.

You can’t tell for sure if the alternator or the battery has a problem until you do a thorough inspection.

3. Dashboard Lights/Warning Signal

If you have an uncharged battery in your vehicle, you may notice that the headlights are dimmer than usual due to a lack of power.

The battery light, ALT, or ‘check engine’ lights on your dashboard may also give you a heads-up if something is wrong with your vehicle.

A malfunctioning ECU sends the wrong signals to the car’s body because the engine’s brain is deprived of enough electricity to function properly (the same is the case with humans when we are hungry, all we could think about is snacks).

4. Electrical System Fails To Function

The alternator is responsible for the proper operation of the vehicle’s electrical system.

The alternator powers the car’s amenities, such as power mirrors and windows, headlights, radio or entertainment, air conditioning, etc.

A failing alternator could be the cause of any of these electrical malfunctions.

How To Replace An Alternator

The charging mechanism gets put through its paces to ensure it’s working properly. A voltmeter that measures the voltage output of a vehicle’s alternator is used for this purpose.

The battery has been removed from the device.

The alternator and the driving belt are removed by the mechanic.

The alternator and drive belt have been replaced.

Reconnecting the battery has been completed.

For safety reasons, the alternator’s voltage (output) is rechecked. There may also be a road test carried out.

Test An Alternator Before Replacing It

Testing an alternator’s power before dismantling it and installing a new one is critical.

A variety of methods for determining an alternator’s power output are outlined below.

Open the hood of your automobile and get to the battery by shutting down the engine. Locate your vehicle’s alternator and make sure the driving belt isn’t slack.

Your multimeter should register 20 volts at this point.

Turn on your car’s engine and check to see if the drive belt is spinning.

Make that the +ve and -ve probes of your multimeter are connected to the +ve and -ve terminals of the battery.

Keep an eye on the multimeter’s reading. A multimeter reading of 13.8V to 14.2V indicates that your alternator is in good working order.

It’s possible to get a reading of 14.2V from a multimeter ( typically higher than 15V).

If this is the case, the alternator may have some faults and you should have it replaced as soon as possible.

Alternators that aren’t capable of charging the battery to a voltage of 13.8 volts, for example, should be swapped out.

Typical batteries have a 12V charge, so overcharging the battery can cause major damage.

Look at this:


Many individuals have questions regarding how to go about changing an alternator.

Q 1. How Long Does It Take To Replace An Alternator?

You should investigate two potential causes of electrical problems in your automobiles if you find that they exist.

The first is your battery, and the second is the alternator on your car.

Make sure the battery is in good condition by opening the hood. The alternator in your vehicle is most likely causing the issues you’re experiencing if the battery is functioning properly.

You should repair your vehicle’s alternator as soon as you notice a problem with it. It could take up to two and a half hours for a mechanic to replace the alternator.

Changing it yourself, on the other hand, can take much longer.

Q 2. How Do I Know That The Alternator Is Not Working Properly?

There are several ways to tell if your alternator is broken.

flashing headlights

Interior lighting should be dimmed.

Dashboard indicators of impending danger

Engine squealing sounds

The smoky odor of charred metal or rubber

Q 3. What Is The Average Lifespan Of An Alternator?

Drivers assume that the battery is the source of their car’s electricity.

However, this is not the case. Vehicles have alternators that provide power to all of its electronic components.

Batteries have a shorter lifespan than alternators. Depending on how frequently and what model you drive, an alternator can last anywhere from 5-8 years on average.

The length of your life is also influenced by the number of miles you have driven. About 60,000 to 150,000 miles might be expected from an alternator.

The top end of this range is reserved for new and modern cars, such as Honda, Lexus, and Toyota, while the lower end is reserved for older models.


Make sure you are familiar with your vehicle’s alternator before driving.

Your vehicle’s alternator recharges the battery and powers the vehicle’s electrical systems.

A malfunctioning alternator will cut off the battery’s power source, resulting in a lack of power for the battery. Eventually, the battery’s charge will run out (enough voltages to work).

As a result, you may be unable to start your vehicle or your vehicle may shut off unexpectedly, leaving you stranded.

If the alternator does not work properly, you could get into major difficulties or get into an accident while driving. Since this is the case, it’s in your best interest to get an alternator checked out and replaced (if needed).