A Belt alternator drives the engine alternator. Keeping the car battery charged is an alternator's job. Without the Belt alternator, the battery could die after a brief amount of driving. Spinning is possible thanks to the alternator belt that runs from the alternator pulley to the crankshaft. An Alternator Belt by Pix is the electric current generator of a car. Alternator belts a major component of the vehicle's charging system. They are Best for the latest generation of motors, high speed used in Automotive engines, alternators, compressors, water pumps, fans, power steering pumps, etc.