An alternator, aka generator, is a component that keeps the car battery charged.
Engine power is conveyed to the alternator through the engine drive belt known as the serpentine belt.
The alternator charges the battery by first converting mechanical energy into a current, which it then sends to the battery.
Keeping the battery fully charged makes it possible to power the headlights, heater, car stereo, navigation, and other electrical systems.
So, you see, an alternator is a very crucial component, and you need to know when it is malfunctioning so that you can fix it immediately.
When a Bad Alternator or fails, the outcome is a ripple of effects of car problems.