Re: Testing coils in 1974 25 HP Evinrude

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May 14, 2015 at 10:38 pm #15973
Don
Participant

    US Member

    It seems strange that BOTH coils have open secondary circuits…
    I would check the plug boot/terminal spring. These things get rusted easily and lose contact with the plug lead. I would pull the plug boot off and check the secondary resistance again directly on the secondary wire.
    PS- The secondary resistance of your coils is significantly higher than your universal mag coils. You will need an ohm meter that can read between 10,000-15,000 ohms clearly.