This switch box is used in ignition systems on Mercury 6,8,9.9,10,15,20, & 25HP 2 Stroke Outboard motors built from 1997-2006 with 4 magnet flywheels
California Residents: 
WARNING
Cancer and Reproductive Harm -
P65Warnings.ca.gov
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Sierra 18-5777 Mercury Switch Box For Use On Engine Models: 6 HP S/N A197112-Up 8 HP S/N A197112-Up 210CC Sail Power S/N A918999-Up 9.9 HP S/N A197112-Up 15 HP S/N B292414-Up 20 HP S/N...
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Sierra 18-5881 Switch Box for Mercury, Chrysler, Force The Sierra 18-5881 Switch Box is for 4 cylinder in-line outboards with ADI ignition systems. All Sierra aftermarket parts are manufactured...
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Mercury Switch Box - Special Order est. 10 Days Replaces OEM 18495A26 Fits Many 75-90 HP Mercury Outboard Motors.
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Click here for Sierra 18-99173 Power Pack Installation Instructions