Professional™ Remanufactured Alternator (334-2791) by ACDelco®. Current: 130 Amp. With 8 Groove Serpentine Pulley. Pulley Size: 64 mm. With Internal Fan. Plug Position: 4:30 O’Clock. Voltage Regulator: Internal. Rotation: Clockwise. Using strict specifications and rigorous testing, ACDelco Remanufactured Alternators are engineered for most cars, light-duty trucks and sport utility vehicles on the road today. As required, ACDelco replaces those parts of its remanufactured units that are most subject to wear and failure with new components.