Ensure your vehicle is Ready for the Road Ahead with a stable source of power for all of its electric accessories, with the Prestolite Model 24SI 12V 160A Pad Mount Alternator. By pairing with the serpentine belt, this replacement alternator converts the mechanical energy from the engine into a usable current of electricity, which is then stored in the battery. Built with rigorously tested wiring to keep your power steering, radio, headlights, and more operating at their best. FleetPride is your First Click in Heavy Duty .