How Long To Replace Alternator

How Long To Replace Alternator


August 10, 2022

When you’re stuck in a situation where your car doesn’t start, it can be scary and uncomfortable.

The battery could be causing your lights to dim, but it is ultimately the alternator that must make sure you have enough charge in order for everything else to work properly.

If there are no signs of life when checking this crucial part then don’t hesitate any longer.

The alternator is the most important part of your car that keeps it running smoothly.

If you think this machine has stopped working, then there are only two solutions: replace or fix!

Let’s discuss how long to replace alternator.

To replace an alternator in your car can be expensive.

The cost will vary depending on the make and model of the vehicle as well if it’s used or new construction- but don’t worry because there are some great deals out there!

The cost of an alternator replacement is between $150 and 400, but you may experience longer trips if it’s not replaced.

The average price for all components including labor comes out to around 500 dollars with free shipping from our store!

How Long To Replace Alternator

Replacement of the Alternator Repairing Cost

An alternator is a very important part that keeps your car running smoothly.

It’s a challenge to find an accurate cost for replacing it, because there are many factors involved in deciding how much you’ll need- like what kind of vehicle and where from!

However, it is important to consider the type of car you drive and where exactly will buy an alternator.

If this question interests you then do not hesitate!

Mechanics will be able to determine how much it’ll cost you by checking the amp-hour capacity of your battery and other components.

The alternator replacement cost will vary depending on whether you decide to do it yourself or go through a mechanic.

To be on the safe side, it is recommended that you visit mechanics as they have all of your essential tools.

What Is An Alternator And How Does It Work?

The alternator transforms the mechanical energy generated by a car’s engine into electrical energy to charge the battery and operate other vehicle electrical systems.

The alternator is what generates the electricity required to run the engine.

The name “alternator” comes from the fact that it generates an alternating current (AC).

Unless you’ve got a Unidirectional DC or even a Tesla running on direct current, AC power or flow is the one that reverses direction periodically.

Both stages of this circuit are capable of producing a variety of voltages.

Because the coils in AC generators produce more voltages than DC power and are thus more efficient in automobiles’ engines.

How Long To Replace Alternator

Alternator Replacement Symptoms That You Should Look For

When the sensor detects smoke, it activates various warning lights on the car’s dash.

The car will display indicators in response to certain causes of malfunction.

If your car is having difficulties starting or you suspect it is because of a failing alternator, you should have the unit replaced.

If you detect any of the following symptoms, go to your car mechanic immediately to replace the alternator.

Engine Sounds

The spinning parts of an alternator may be restricted, causing the engine to squeal or make unusual noises.

Look for where the sound is coming from.

Examine and recall the noises you hear so that your mechanic can diagnose your automobile’s problems.

The information on the noise coming from the engine will assist a mechanic in finding his or her way.

Your Vehicle Won’t Start

The battery is the one that starts a vehicle, not the alternator.

The alternator just helps to charge the battery as the car is moving.

If the battery is dead, there’s a good chance the alternator is failing.

You can’t just guess whether the battery is faulty or the alternator on its own until you test it.

Dashboard Lights/Warning Signal

You may notice that your car’s headlights are dimmer than usual since the battery is uncharged due to a lack of power.

You may also see warning dashboard alerts, such as the battery light, ALT, or ‘check engine lights on your vehicle’s dashboard.’

When the electricity isn’t properly supplied to the Engine Control Unit (ECU), the engine’s brain can’t think correctly, and incorrect signals are sent to the automobile’s body.

Electrical System Fails To Function

The vehicle’s electrical system is run by the alternator, which ensures that it functions correctly.

The alternator, in conjunction with the accessories like power windows and mirrors, headlights, radio or entertainment systems, air conditioner, and so on, maintains the electrical components.

If any of these electrical components cease to function or break down, the alternator is likely to be the cause.

How To Replace An Alternator

  • A charging system is tested and inspected to ensure that everything is in working order. A voltmeter, which reads the number of volts generated by an automobile’s alternator, is used for this purpose.
  • The battery is no longer connected.
  • The mechanic removes the alternator as well as the drive belt.
  • A new drive belt and alternator are put in place.
  • The battery is reconnected.
  • The alternator’s volts (output) are double-checked to ensure that it is working properly. A trip may also be taken.

Test An Alternator Before Replacing It

Before removing and replacing an alternator, it’s essential to test its power.

The power (output) of an alternator can be verified in the following ways.

  1. To get to the battery, turn off the engine and open the hood. Check that your vehicle’s alternator is secure and that the drive belt isn’t frayed.
  2. On the 20V scale, turn your multimeter upside down.
  3. If the engine is on, check the drive belt for proper functioning (spinning).
  4. Join the +ve probe of your multimeter to the battery’s +ve terminal and the -ve probe of your multimeter to the battery’s negative terminal.

Note the reading on the multimeter. If your alternator is in good working order, the multimeter should read between 13.8V and 14.2V.

However, suppose the multimeter reads greater than 15V (as would be expected).

If so, the alternator may have some flaws that need to be addressed.

If the reading on your battery is less than 13.8V, it’s typically because the alternator isn’t generating enough power for the battery to operate properly, so it’ll need to be replaced.

Because a typical battery has a capacity of 12V, you should not charge it aggressively above that voltage.

Frequently Asked Questions

These are just a few of the most frequently asked concerns about changing an alternator.

Is It Possible to Replace An Alternator?

When your automobile’s electrical problems start, you should check into two of the most prevalent causes.

The battery is the first, and the vehicle’s alternator is the second.

Check the battery first.

There’s something wrong with your car’s battery if the alternator isn’t creating problems.

If you find that your car’s alternator is broken, you should replace it immediately.

It might take anything from 2 to 3 hours for a technician to change the alternator.

It may appear to be less difficult to modify a toilet set than you’d think, but it isn’t nearly as simple as taking the old fittings off and replacing them with identical ones.

If you’re willing to put in several hours of effort, go right ahead and do it!

What Is The Average Life Expectancy Of An Alternator?

Although they believe their vehicle’s power comes from the battery, drivers are incorrect.

The alternator on a car is responsible for delivering electricity to all of the vehicle’s electrical components.

Alternators have a longer lifespan than batteries.

Alternator life varies by brand and model, but on average it is around five to eight years.

The breakdown lifespan is also determined by how many miles you have driven.

An alternator can operate for 60,000 – 150,000 kilometers.

The maximum legal blood alcohol content is .04%, with the lower end at .03%.

Newer vehicles from reputable manufacturers such as Honda, Lexus, and Toyota are at the higher end of this limit, while older cars fall at the lower end.


The alternator is a crucial component of your automobile, and you should have a clear understanding of it.

The alternator supplies power for the functioning of your car’s electrical components, such as lights and radio.

If the alternator stops working, the power supply to the battery is interrupted, and adequate power is not delivered to the battery.

The battery eventually fails to be charged (enough voltages are available).

As a result, you will not be able to start your car or it may cause it to switch off at any time, leaving you stranded on the highway.

If the alternator fails, you may wind up in big trouble or have an accident while driving.

As a result, it’s critical that you get your alternator looked at and replaced (if required).


Jeffrey Bryce is an experienced motorcycle rider with years of experience caring for motorcycles. His natural fondness for motorcycles have made him come up with, which is dedicated to answering and teaching you how to care for your bike with the care it requires. LetsGoForARide is the one of his important lifework in reaching out to communities of motorcycle enthusiasts on how to take care of their bike and choosing the correct spare part.