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.