The SM 7842 Alternator Rotor Assembly is an ultra-heavy-duty electrical component specifically engineered for the 24-Volt Lucas-style (L. Type) charging systems used in MAN Trucks and Mahindra-Navistar (MN25/MN31) heavy commercial vehicles. Built to O.E. (Original Equipment) Specifications, this rotor is designed to meet the rigorous power generation requirements of high-displacement engines used in mining tippers, tractor-trailers, and specialized haulage.