An alternator is one of the most important auto parts in the charging system. The alternator converts mechanical energy to electrical energy to keep your car's battery charged. The alternator supplies electricity to the battery, which in turn powers all the electrical components of your automobile.

As your automobile uses its battery power to operate the starter, ignition system, fuel pump, headlights, wipers, ac/heater, power windows, power locks, stereo etc., the alternator continually replenishes the battery with electrical energy.

The alternator is made vulnerable by excessive heat and loads. Extreme outdoor temperatures can cause excessive heat, as can a demand for electricity that is too high for the alternator to keep up. If the alternator gets too hot, the regulator inside the alternator often burns up. This causes the alternator to stop replenishing the battery's supply of electricity. Without its electricity replenished, your automobile's battery will soon run out of the amount of electricity required to power your vehicle's electrical components.

How do you know if there is a problem with your auto's alternator? When your battery light comes on and stays on while the engine is running, this is normally the first indication that there is a problem with the charging system, and it usually points to the alternator not charging properly. Remember, the auto's fuel pump and ignition systems continually use electricity. Without the alternator replenishing your battery, you'll have precious little time to reach a destination.