Premier Gear PG-7127-SEN Professional Grade New Alternator Provides protection from excessive charging or failure due to shorts in your car's wiring that can cause spikes or open circuits Consistent performance from manufacturing processes that exceed your vehicle's original specifications for wiring, bearings and components helping to resist heat and moisture Longer life of the alternator through the use of premium brushes and other critical components that resist failure or poor performance Delco, 10SI Series, Internally Regulated/External Fan 63 Amp/12 Volt, Clockwise Rotation, 1-Groove Pulley, Universal Self Energizing 1-Wire System