Equip your vehicle with a stable source of power for all of its electric accessories, with the OTR Model 35SI 12V 140A Hinge Mount Alternator with Expertise Built In™. Due to its partnership with the serpentine belt, this replacement alternator is able to convert the mechanical energy from the engine into a usable current of electricity, which is then stored in the battery. Constructed with meticulously-tested wiring to keep your radio, power steering, headlights, and more operating at their best. FleetPride is your First Click in Heavy Duty®.