How to Replace an Alternator
Introduction
If your car or truck won't hold a charge, you probably need a new alternator. Learn how to test it and how to replace it yourself.What does an alternator do?
Think of your car’s alternator as a small but mighty electric generator. It charges the car battery and runs a vehicle’s electrical system while the engine is running. It’s one of three essential components of a vehicle’s electrical system, along with the battery and voltage regulator.
How does an alternator work?
Located near the front of the engine, your car’s serpentine belt wraps around a pulley attached to the alternator. As the engine runs, the alternator takes the mechanical energy generated by the serpentine belt and turns it into electrical energy.
The pulley turns a rotor shaft inside the alternator that spins magnets. This create an alternating current, which is then turned into direct current by diodes within. That direct current powers the electrical systems in your car when it’s running.
Signs of a bad alternator
If the charging light is lit on your dashboard or your battery won’t stay charged, chances are you’ve got a bum alternator. (For some cars, the check engine light might pop on if the alternator is failing.) Other signs of a bad alternator include dim or flickering headlights, or if your car dies after a jump start.
How much does it cost to replace an alternator?
It runs between $400 and $600, depending on the make and model of the vehicle, according to AAA. However, it’s not unusual for the job to cost more than $1,000.
What to know about buying an alternator
Instead of selling only to the carmakers, some manufacturers now sell new alternators through online stores. In many cases, you can buy a new alternator with a lifetime warranty for 30 percent less than the cost of a rebuilt one. So if you can live without your car for a couple of days, buy online.
How long do alternators last?
Alternators typically last between seven and 10 years, sometimes longer. The most common reasons alternators fail include damaged parts within, overuse, or engine oil or power steering fluid leaking into it.
Can I replace the alternator myself?
Yes. Replacing an alternator isn’t a complex task, but it does require a basic understanding of car mechanics. If you’re not comfortable doing it yourself, it’s best to take it to a pro to make sure it’s done correctly.
Even if you’re not confident replacing your alternator yourself, it’s a good idea to test it before taking it to a mechanic.
ncG1vNJzZmivp6x7p63MoqOyoJGjsbq5wKdlnKedZL2zu8memq1nkaHBpr7Nmquoql2nsrG4wJycpp2eqXq4tMSnZK2nXaG2tMDEp2Stp12uvLa%2BjKacnKCRo7akew%3D%3D