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    1979 merc 140 eletronics

    the thing is driveing me nuts. new triger/switch boxs/ everything was fine then 3 and 4 no spark. after afew trips around lake.coils are fine but both boxs again? shop sold me sierra boxs # 19-5775. my merc box # 332-5524a1 I can not find that number in the sierra web sight or is something...
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    only one dead coil

    1979 140hp merc. #3 no spark.i took coil pack off and cleaned behind.No good.So i took #2 coil wire off switchbox put it on #3 coil no spark.Rechecked #2 had spark. Is this a good way of testing? I just thought it was a little weird that only one post on box would go bad. And it has a brand new...
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    1979 140hp merc wireing problems?

    1979 inline six. My key switch was bad or so i thought.I cut it away and tryed to wire it with out switch. I hooked up red wire and orng. wire and touched yellow wire to engage starter. no sprak but when i unhooked orng. wire i had spark.I had power at orng. wire on switch box but none at white...
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