TYC 2-13821 Nissan/Mercury Replacement Alternator 100% new units produced by an OE supplier, no hassles with core charges OE-comparable product configuration and power output ratings Brushes, armatures, rotors, rectifiers, regulators, and other components are built with durability and performance comparable to OE Consistent manufacturing processes ensure premium quality in assembly and exterior finishing Stringent efficiency and cycling tests are performed, with a copy of performance metrics results enclosed with every unit