Sierra 18-5956-1 Mercruiser AlternatorSierra alternators meet or exceed USCG safety requirements and are 100% load tested for assured reliability. This Sierra Alternator is equipped with fan and drive pulley. Equipped with fan and drive pulley; 1 Wire; Amp Rating: 68; Interchangeable with: GLM; 74000; Mallory; 9-19100; Mercruiser Stern Drive; 78403A2; 78403A1; 69729; 59755; 56045; 78477; 90794;