GM Alternators

The alternator is a part of the charging system in your GM car, truck, van, or SUV. What it does is simple. It turns the engine's mechanical energy into the electrical energy that powers the vehicle's battery and electrical systems.

How Do Alternators Work?

Your crankshaft takes the vertical motion of the pistons and converts it into rotary motion. That rotary motion moves a belt attached to a pulley on the rotor shaft. The rotor shaft contains magnetic coils, which are agitated by the motion and generate a magnetic field as a result. A rectifier captures that as AC power and converts it into the DC power that parts like your power windows, entertainment system, windshield wipers, and power steering use.

How Do You Know When Your Alternator is Going Bad?

Unfortunately, alternators can go bad. Whether that's due to worn or damaged parts, improperly installed accessories, or a poorly executed jump-start, you need to replace your bad alternator as soon as possible. Signs of trouble include:

• Dimming headlights
• Troubles with the sound system
• Your power windows quit working
• A whining sound coming from your engine
• The battery repeatedly dies
• A burning smell coming from under the hood

Which Alternator is Best for Your Vehicle?

If you notice any of these problems, test your charging system. If your alternator is going bad, replacing it with one made by your manufacturer is a smart decision. That's because those are the only alternators that are guaranteed to be compatible with your model. Our online auto parts catalog has everything you need in stock and ready to ship. Buy now and save!