Back to all

Alternator Facts (Failing Alternator)

December 3, 2023

If you notice that your headlights are flickering at night, that's something to pay attention to. While there could be many different things that could cause that problem, one possibility is your vehicle's alternator.

The alternator takes mechanical energy from the engine and turns it into electricity, in essence a generator.  The current it makes charges the battery and supplies power to the vehicle's electrical systems.  An alternator is made up of several different parts: a pulley, magnets, coil wires, brushes and a voltage regulator.  While your vehicle is running, these parts get a good workout and, after time, they begin to wear out.

Other symptoms of a failing alternator include your vehicle's lights dimming, the power windows going up and down more slowly than they used to, your power seats not moving quite as fast as before. 

Another sign of a worn out alternator is engine stalling.  Vehicles with fuel injection require a certain amount of power, and when an alternator is going bad, your engine could stall because the alternator isn't cranking out enough of it.

An alternator on its last legs can also fail to charge your battery properly.  Sometimes your battery isn't getting enough charge from the alternator and will go dead.  It also can be the opposite problem. The battery is getting too much power and will cause the battery to get hot.  Your vehicle may give you a clue on the instrument panel.  If you see any of these warning lights, take note: Check Engine, ALT, CHARGE or one that looks like a picture of a battery.  If that light is on, it's time to have your service facility give it a look.

As mentioned earlier, there are other components of your vehicle's electrical system that can fail, such as a worn out serpentine belt or a malfunctioning voltage regulator.  A reputable service facility has diagnostic tools to pinpoint the causes of your problems. And when your issues are fixed, your electrical system will be back to its hard-working self.  You'll get a real charge out of it!

Tuffy Fort Mill
9909 Charlotte Highway
Fort Mill, SC 29715
803-802-2466
http://www.tuffyftmill.com

More articles from Tuffy Fort Mill

Steering Clear in Fort Mill

February 8, 2026

Those who know vehicles believe the steering system may be the most vital component of them all. Perhaps you've found over the years your steering has gotten loose. Or maybe suddenly, your steering wheel has gotten very hard to turn. Let's steer you in the direction of understanding why this may ... More

Braking Good (Brake Drum Replacement)

February 1, 2026

Maybe your vehicle feels like Breaking Bad. In other words, when you brake, things are bad. You may find it takes you a longer distance to stop, you feel a vibration, or its pulsating when you depress the brake pedal, or perhaps your vehicle pulls to one side. Those can be symptoms of failing b... More

Getting Off to a Running Start (Starter Replacement)

January 25, 2026

When you start your vehicles engine, theres another motor that makes that whole process possible. Its called the starter, and its a small electric motor that gets your vehicle running. As you can imagine, its quite a chore for a little electric motor to turn over the big engine that powers you... More