Update your vehicle with a stable source of power for all of its electric accessories, with the OTR Model 36SI 12V 170A Pad Mount Alternator with Expertise Built In™. This replacement alternator pairs with the serpentine belt to convert the mechanical energy from the engine into a usable current of electricity, which is then stored in the battery. Engineered with tried and tested wiring to keep your headlights, power steering, radio, and more operating at their best. FleetPride is your First Click in Heavy Duty®.