The alternator is a part of the electrical system of your car which is generally responsible for powering the car accessories. It is a dynamo which can converts the mechanical energy of the crankshaft into electrical energy to store in the car battery. It is basically used for converting the mechanical energy for producing the electrical current from the engine to the other devices of the car. Like the ignition system of the car, it totally depends on the output power of the car battery. When the alternator of the car is damaged, then it will show the warning signs defined in the slides.