merc 40 3cyl rev limiter issue 1999 model

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Apr 14, 2015
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70
my friends boat had a bad key switch ,replaced ,wouldn't start no spark ,unplugged kill wire ,(black with yellow stripe )at the rev limiter module engine starts up ,of course wouldn't shut off until grounding wire again ,I would safely say ,bad rev limiter ? ....I unplugged top cylinder coil/cdm and engine dies ,if I unplug #2 cyl or #3 cyl cdm plug motor will run ,but miss of course ...I am trying to understand this system is this normal to unplug the top cdm/coil and engine dies ?
 
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