Alternator for MerCruiser 1987-98, 3.0L 4-cyl, 120-135 Hp | 4.3L V6,150-155 Hp | 5.7-7.4L V8, 215-385 Hp engines. Single groove, 55 Amp/12 Volt, Bi-directional, for Mando IR/EF. Replaces Mercury 12449, 19685, 817119, 817119-1, 817119-2, 817119A1, 817119A4, 92497, 92497A3, 98555 and Sierra 18-5966.