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 alternator that …

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.

What is an Alternator? Put most simply, it charges your battery. It does this by converting mechanical energy from the rotation of the engine's crankshaft into electrical energy while the engine is running. …

Mar 4, 2025 · Learn how your car's alternator powers electrical components and charges the battery. Discover how it works, signs of a bad alternator, and when to get service.

Discover alternators with precision engineering and durability. Find compatible replacements for your specific vehicle model.

Sep 10, 2025 · It’s essentially a small generator that converts mechanical energy into electricity, bolted to the engine and driven by a belt connected to the engine’s crankshaft. Inside, a rotor spins past...

The alternator's rotor is comprised of a series of magnets that rotates quickly and produces an alternating current (AC), which is converted into direct current (DC) using the rectifier or diode.

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 replacement …

This occurs because the alternator is responsible for generating electrical power to keep the battery charged and supply power to various electrical components in the vehicle while the engine is running.

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 hybrids have …