How Long Does It Take To Replace An Alternator? Symptoms Included

How Long Does It Take To Replace An Alternator

This guide will highlight how an alternator performs, How Long Does It Take To Replace An Alternator, and how to detect if the alternator isn’t operating correctly.

When it concerns automobile servicing, having basic technical abilities helps a lot. Many fixes are costly, and they are often unanticipated. The automobile battery is frequently the first thing that comes to mind when owners picture a vehicle’s electricity supply.

On the other hand, the battery generates minimal energy for a car. The alternator is in charge of delivering power to your vehicle’s major components and electrical systems.

If you’ve checked your alternator and discovered that it’s the source of your troubles, you’ll need to replace it, which doesn’t seem to be the most challenging task.

Read more about the symptoms of a faulty alternator and when to replace it.

Symptoms of a Faulty Alternator

When you drive your car, the battery creates the electric current required for combustion to develop. After then, your battery will only act as an auxiliary backup in the event of an alternator failure.

The alternator is the component that transforms mechanical energy from the ignition engine into electrical current. It also keeps the battery from depleting by continually recharging it while the car is running. It refills what you’ve utilized to help start the engine while you move.

Power struggles are one of the warning signals that something is wrong. You might discover that your dashboard lights are dimming due to a lack of power. It would be best if you replaced your alternator as soon as possible.

If it malfunctions and your battery dies, you may be stuck. The latter issue will increase your expenses. Automotive batteries are lead-acid batteries and cannot withstand repetitive deep cycles, but Li-ion batteries can.

They will limit its lifetime and cause you far more problems in the future. Aside from that, they are almost as expensive as the alternator. Let’s look at how long does it take to replace an alternator

How Long Does It Take To Replace An Alternator?

A trained pro technician will repair your alternator in around 2 hours; we guess it depends on the make and model number. Though, most establishments in the United States will cost you a whole day’s labor.

Suppose you opt to replace it yourself at residence without that much expertise. In that case, it must take you approximately 3-4 hours, based on the type and model of the vehicle.

If you have no technical knowledge, let’s not try to change it yourself; dealing with electricity might wreak havoc to your automobile or injury to yourself.

How Long Can an Alternator Perform?

Alternators have a longer lifespan than automobile batteries. But, when questioned about the lifetime of an alternator, manufacturers often provide contradictory replies.

Your device’s alternator should generally last 4–6 years, although this heavily depends on how frequently you use the automobile. Around 40K and 80K miles, most automobiles need alternator maintenance. Therefore, if we talk about a newer car, it will likely be trouble-free until it hits the 80K mile mark.

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How To Replace An Alternator Of A Vehicle?

You will be working with electricity when fixing your alternator, which might be hazardous. Get professional guidance if you don’t comprehend what you’re coping with here.

It’s not a complex operation, but if you choose to do it yourselves securely, you’ll need to get some expertise operating on automobiles. You’ll additionally require substitute components for your particular model number. It involves an alternator, battery, straps, sprocket, bolts, connections, and everything else that’s needed.


First, unhook the battery line from the positive end and find the alternator within your engine block. If it’s nearer to the surface and you can’t access it upwards, park your vehicle on a rarity level and lift it.

Always ensure to release the handbrake and place your vehicle on jack supports. Never climb beneath a car that gets solely raised by a jack; it will not end well.

Take out your alternator

Disconnect the belt with a ratchet by rotating the alternator shaft. Release the nuts that are securing the alternator in position. The time duration will be between three and four mins based on the type of your fastener and how you retrieved it.

Loosen the bolts with a ratchet while holding the dynamo in place. Extract the alternator after effectively removing the bolts and unplugging all power cables.


Compare the new alternator to the old one. Check that the terminal voltage of the regulators and the sprocket equal the previous one. If it does not match, return it to the store and exchange the dynamo with the correct one.

Reverse the procedure to put in a new alternator. Connect the connectors and cables to the new dynamo, move it into position, and fasten the bolts.

While mounting the bolts, replace the dynamo pulley and ensure the belt gets set correctly. Place the belt on the dynamo sprocket and secure the fastener with the wrench.

Next, to keep the belt tensioner, disengage the pulley. Attach the battery connection at the positive electrode. Finally, restart your vehicle and ensure the dynamo is feeding the battery.

Cost of Replacing an Alternator

Now, after how long does it take to replace an alternator, let’s talk about its cost. The cost gets mainly determined by the brand and type of your vehicle. They begin at $100 and go up to $500!

If you purchase your components from a showroom, they will be more expensive, and the workforce will cost between $100-250. So, based on the type and car model, it will charge you between $400 to $1000.

Bottom Line

Replacing an alternator will take approximately 2 hours. When working with electricity, you must exercise extreme caution. Don’t hesitate to consult your vehicle’s owner’s handbook to identify everything before beginning the operation. When changing an alternator, only utilize OEM grade or original components.


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