What Is An Alternator And Why Is It Important?
An alternator is a small but important part of your vehicle. If it fails, your car will soon be stuck by the side of the road. In this post, we discuss what an alternator does and why it is such a crucial component in your Subaru's electrical system.
What Is An Alternator?

An alternator is a small electrical generator. It provides power to various electrical components and charges the battery while the engine is running. The key functions of an alternator include:
- Power Conversion: Converting mechanical energy from the engine into electrical energy.
- Battery Charging: Maintains the battery's charge. This ensures that the battery has enough power to start the engine and run electrical systems when the engine is off.
- Electrical Supply: Powers various electrical components such as headlights, radio, and air conditioning.
Where Is The Alternator?

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Most Subaru alternators are round and have a metal or aluminum casing. Copper windings are usually visible through the casing. They are situated close to the engine, usually mounted on the block, and run by the serpentine belt.
What Is The Alternator Made Of?
Modern Subaru alternators are made from aluminum, metal, copper, and electronic components. The main parts include a rotor, stator, voltage regulator, diode rectifier, and, in some cases, a cooling fan.
Each alternator is designed to work with specific Subaru models. Replacing one with an incorrect or non-OEM part can damage your electronics and potentially leave you stranded with a big repair bill.
Evolution Of Alternators
The first alternators for mass-produced automotive use started arriving in the 1960s. They were relatively simple, consisting of a basic rotor and stator assembly. They were less efficient and had lower power output than modern alternators. But they were a big step up from the dynamos that had been in use up until that point.
Modern alternators are highly efficient. Capable of producing more power to meet your Subaru's increasing electrical demands. They often incorporate advanced technologies like internal voltage regulators and smart charging systems.
Choose Subaru Parts Plus For Your OEM Alternator Components

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Subaru Parts Plus has been supplying quality OEM Subaru parts since 2005. Every part we sell is genuine, sold at wholesale prices, and comes with Subaru’s manufacturer warranty.
We stock a full range of alternators and alternator accessories like bearings, pulleys, and rectifiers for your Subaru. Whether it’s the latest model WRX or a high-mileage Legacy from the ‘90s, Subaru Parts Plus has the right OEM replacement part for you.
Our staff are as passionate about Subarus as you are. They are available to help you online or over the phone at 1-888-294-4979. If you are having alternator issues, get in touch today, and let us find you the perfect OEM replacement part.