An alternator is a key component in a vehicle that’s responsible for keeping the battery charged while the engine is running. Usually found under the hood and attached to the front block, an alternator is part of a car’s starting and charging system that powers the electronic features and provides the spark needed to get the engine started. Supplying the battery with voltage is the alternator’s main responsibility. Doing so prevents the battery from dying while the car runs and allows for the use of electronic accessories, including the radio, interior lights, exterior lights, power windows, and windshield wipers. The alternator is typically powered by a car’s serpentine belt, which often also powers a vehicle’s air conditioning, compressor, and power steering.