NEW FOR 2017- The Elite series offers the highest possible amperage and durability available in a large case alternator. 6 phase technology combined with massive twin rectifier assemblies and 12 (80) amp diodes makes these alternators totally durable for daily use. These impressive alternators produce 200+ at engine idle RPM and 320+ amps at cruising speeds HOT RATED. This unit comes with a smaller diameter pulley, and will require a 1/2 inch to one inch shorter than stock length belt. Installation Notes: This unit may require an additional rectangle to oval adapter harness if the vehicle was originally equipped with the CS144 Heavy duty charging option from the factory. (this is not common) This unit is a direct plug in for any truck originally equipped with the more common oval shaped 4 pin plug.