Why Does My Battery Keep Going Dead?

Your battery keeps going dead but you had it tested and it is showing that it is fine. What else could be the issue? Well, it could be caused by several things. Let’s start with a likely suspect: the alternator. The alternator is like a little electrical generator. It is spun by the serpentine belt on your engine and makes electricity. This electricity is used to power the electrical systems required to run your vehicle. It also powers all of your electronic accessories like your stereo, navigation, heated seats, and air fans, as well as charging all the electronics you have plugged in.

After the alternator has preformed all that, any electricity that’s left over is used to charge your battery. (Can you can see where we’re going?) If the battery isn’t getting enough electricity to stay charged the problem may have something to do with the alternator.

If the alternator is bad – as they do wear out over time, there are a number of failure points within the alternator. In practice it is less to simply replace the alternator than to take it apart and repair it. (unless you are an electrical genius who likes to do that sort of thing.)

At Automotive Service & Tire, we can test your alternator to see if it needs to be replaced. We may find that the alternator tests out as being OK – but for some other reason it’s not putting out enough electricity to keep the battery charged. Remember we said that the serpentine belt drives the alternator? Well the problem can often lie with the serpentine belt system.

The serpentine belt transfers power from the engine to the alternator. When the belt wears away to a certain point, it is no longer able to provide enough grip and the belt can slip on the alternator pulley so that it is not spinning enough to generate all the electricity that your vehicle needs.

Another possible problem related to a worn serpentine belt is the tensioner pulley. This pulley provides tension on the serpentine belt so that it is tight enough to spin the alternator and other accessories. When the belt is too loose, it can slip on the alternator pulley and, once again, not enough electricity is made. And could also possible tear up your belt.

So, when you battery is going dead – test it. If the battery is still good – test the alternator. If the alternator is still good – inspect the serpentine belt and belt tensioner. Chances are good that your service center or the team of friendly and knowledgeable service advisors at Automotive Service & Tire will get to the root of your problem and be able fix your vehicle right away.

Give us a call and make an appointment today to have your charging system tested and serviced before the winter months. Don’t take a chance on getting stranded in the cold.

Automotive Service & Tire


1501 E. Main St.
Rock Hill, SC 29730