Shop for the best Alternator for your vehicle, and you can place your order online and pick up for free at your local O'Reilly Auto Parts.

In principle, any AC electrical generator can be called an alternator, but usually, the term refers to small rotating machines driven by automotive and other internal combustion engines. An …

Find an alternator that fits your car and delivers the same performance as original equipment, or better. We carry long lasting replacements, like Duralast Gold alternators that come with a …

Mar 4, 2025 · It supplies electricity to the battery and electrical system to keep your car alive when the engine is running. As you drive around or idle, the alternator powers key components like …

May 9, 2022 · An alternator is a generator of electric power in a car and is a major component of the vehicle's charging system. All cars with an internal combustion engine except for some …

Nov 17, 2025 · Testing an alternator properly is one of the most useful automotive diagnostic skills. Many “dead battery” or “no start” situations are actually caused by charging system …

Choose from a wide range of new and remanufactured alternators for any location (upper, lower, primary, auxiliary, etc.). Take a look at our products today and get big savings on a …

How do Alternators Work? Your vehicle’s alternator is part of its starting and charging system. Its primary job is to maintain the charge of your car battery. Alternators produce AC power …

An alternator converts mechanical energy from the engine into alternating current, or AC, electricity. The alternator uses a rotating electromagnet to generate the AC electricity, which is …

Find a huge in-stock selection of high-amp, one-wire, and chrome alternators and generators! Get the amperage you need or the added styling you want!