Enter Vehicle Year Make Model

Specify your vehicle's year, make and model to guarantee fit.


What year is your
Free Same Day Shipping


Filter Results


How do I know if my alternator needs to be replaced?

Automotive alternators fail in the same exact way, they stop producing enough energy to charge the battery with.  Signs of a failing alternator include low voltage readings on your dash gauge, dimming of headlights at night with other accessories running, battery overcharging, and a dead battery which makes the car or truck unable to restart.

Can I replace the alternator myself?

Replacing the alternator is time consuming and can be difficult for people with little automotive experience. Finding a shop manual for your automobile and reading the procedure before you begin is the best way gauge what you're up against and whether or not your ready for the project.

The majority of alternative repairs are fairly simple and typically require no more than a ratchet and a few sockets.  The first step involves loosening the serpentine belt by releasing it through the tensioner.  Once the serpentine belt is removed, the wiring harnesses to the alternator need to be disconnected.  Then remove any remaining nuts from the alternator and it should slide right out.

Need an alternator replacement?

If you are in need of an alternator replacement, you have come to the right place. 1A Auto knows everything about car and truck alternators and stock the highest quality, best fitting aftermarket alternators available.

1A Auto Alternator Features

  • Brand new aftermarket alternators.  Not rebuilt or remanufactured so you won't be charged a core fee or encounter hassles trying to return a core.
  • 94% higher reliability rate than remanufactured alternators.
  • Constructed with the correct pulleys and heavy duty bearings; giving the alternator a long work life.
  • Comes with the correct internal regulators for direct original equipment replacement, ensuring a proper fit.

At 1A Auto, shopping for an alternator replacement for your car, truck, SUV or van is easy. For answers to some of the more frequently asked questions about alternators, please see our FAQ's below. Don't be inconvenienced by an incapacitated automobile; buy a new alternator from 1A Auto today and you can rest assured your car electronics won't fail anytime soon.

Frequently Asked Questions About Alternators

How do I know if my alternator needs replacing?

If you experience dimming lights, poor heater function, and a dying radio while driving, then there's a chance your alternator is failing. If your battery constantly loses its charge or your car has slow engine turnover, those are also good signs that your alternator may be on its way out.

Why would my alternator fail?

Common reasons for Alternator failure include defective wiring, rotor failure, worn brushes, excessively tight or loose belts, overheating, electrical overload from the battery, and oil or coolant leaking into the alternator among other problems.

How do I know I've got the right alternator?

Our product development team spends 8,000 hours a year researching our parts, providing you with 4x more information per part than the competition. Each alternator is listed with all years and models it will fit, saving you the aggravation of selecting the wrong part.

What is an alternator and where is it located?

Your alternator is a vital part of your vehicle's electrical system. Mounted onto a car or truck’s engine, it converts your vehicle's mechanical energy into electrical energy. With the help of some other components, the alternator manipulates Alternating Current (A/C) into Direct Current (D/C) to both keep the battery in your vehicle charged to factory specifications and power your automotives’ electronics. Without an alternator, your vehicle will run out of juice very fast, leaving you stranded. 

Here is how it works: inside the alternator there is a rotor (rotor = field windings) that spins inside the stator (stator = induction windings). Basically, it is two big magnets spinning next to each other, but never touching. As the alternator rotor is spun within the confines of the stator, the magnetic field between them creates Alternating Current. Since cars run on Direct Current, the A/C needs to be turned into D/C. In order to do this, diodes need to enter the picture, which are called a rectifier bridge in the alternator realm. They are basically devices that straighten out the alternating electricity waves. As the alternating current is produced by the spinning magnets, it is pushed through the rectifier bridge, which then converts the A/C output into D/C voltage out the opposite side. The newly made D/C electricity then travels over to the vehicle’s battery through some wire. Since the car’s battery is full of D/C energy, it further cleans up the ever-so-slightly imperfect Direct Current that it is getting from the alternator. This makes the electricity perfectly clean for sensitive automotive electronics to enjoy.

Along with your battery, a voltage regulator also plays a role in this process. Newer alternators today have the regulator built right inside of them, while in older cars the regulator was separate from the alternator. Regardless of location, the voltage regulator tells the alternator how much electricity to make based on the current needs of the vehicle. In a nutshell, it is the boss of the alternator and tells it how hard to work.

For more detailed information about alternators, how they work, replacement tips and more, check out our in-depth alternators guide.

Choose the Make of Your Vehicle

Same Day Shipping

Need your part faster? Choose expedited shipping at checkout.

Guaranteed To Fit

Highest quality, direct fit replacement auto parts enforced to the strictest product standards.

USA Customer Support

Exceeding customers' expectations, our team of passionate auto enthusiasts are here to help.

Instructional Video Library

Thousands of how-to auto repair videos to guide you step-by-step through your repair.

Go To Top
Specify your vehicle

Specify your vehicle's year, make and model to guarantee fit.

If your vehicle isn't listed, close the window to return to search.