Compatible With: Mercury / Mariner Models  Horsepower Serial Numbers 35 6445653-C159199 35 (with 1 trim ram) C159200 and Up 40 5823918-G053313 45 4-cyl w/o circuit breaker 6146849 and Up 45 4-cyl B110789 and Up 50 4-cyl w/o circuit breaker 6146849 and Up 50 3-cyl B122930 and Up 60 c-cyl with solenoids or relay B122930 and Up 70 3-cyl A996147 and Up 60 3-cyl D402461-G127499 80 3-cyl A996142 and Up 90 3-cyl A996142-C221999 V135 (with 8/32 1/4-20 terminals) A904646-C100860 V150 (with 8/32, 1/4-20 terminals) A904646-C100860 Mercruiser Models Model Number Engine Years Serial Numbers 120 - 2.5L GM 4 1983-1989 6229718-C853255 200 / 5.0L with ignition module mounted on distributor GM V8 1987 - 1995 B525982-F600999 5.0L / 5.0L EFI GM V8 1998 and up L015751 and Up 260 / 5.7L with ignition module mounted on distributor GM V8 1987-1995 B5258982-F600999 5.7L / LX GM V8 1996 and up F601000 and Up 5.7L MIE GM V8 1977 and up K040307 and Up 5.7L Ski GM V8 1996 and up F775200 and Up 350 Mag Alpha with ignition module mounted on distrubtor GM V8 1991-1996 D505450-K040399 350 Mag Alpha GM V8 1997 K001527-K999999 350 Mag Ski with Thunderbolt V ignition GM V8 1991-1996 D505450-K040399 350 Mag Ski GM V8 1997 K040400-K999999 350 Mag MPI Ski GM V8 1998 and up L002600 and Up 7.4L with ignition module mounted on distributor GM V8 1992-1997 D603118-K999999 7.4L MIE with Thunderbolt V Ignition GM V8 1992-1997 D715494-K999999 7.4L MIE GM V8 1998 and up L002006 and Up 454 Mag GM V8 1995-1997 F305000-K999999 8.2L MIE GM V8 1993-1996 D857200-F819619 Replaces: MERCURY MARINE 89-846070, 89-94318, 89-96158, 89-96158T SIERRA MARINE  18-5817 Isolated Base, 12 Volt, Includes 1/4-20 Threaded Battery and Motor Terminals