Mercruiser Rectifier/Voltage Regulator Fits 1976-1984 (470 w/ 2 BBL Carb) 1980-1984 (485 & 488 w/ 2 BBL Carb) 1985-1986 (170 & 190) 1987 (165 & 180) 1988-1989 (3.7L) engines using a water cooled regulator. Replaces the following parts: