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  1. #1

    Default a wiring diagram for 1960-1965 Johnson 40hp - review

    I am reviewing wiring diagram for 1960-1965 Johnson 40hp . We can see that the wire came from “M” terminal of the key switch to the cylinder coil (It is not "M" terminal to kill engine). This coil will be powered by 12v continually and be fired. Can somebody to answer for this question?

  2. #2
    Supreme Mariner
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    Default Re: a wiring diagram for 1960-1965 Johnson 40hp - review

    I thought all those motors were magneto ignition. The magnets of the flywheel produces all the voltage necessary to fire the spark plugs. The magneto ign coils were shorted to each other to kill the spark.

  3. #3

    Default Re: a wiring diagram for 1960-1965 Johnson 40hp - review

    Thank you Chris for reply.
    I understand how it working.
    However, I do not understand why coil powered all time by 12v.
    ______
    “M” terminal o--------| coil |----------o “Ground”
    -------
    If we put on the coil in the circuit with 12v it will be broken after few minuts.

  4. #4
    Supreme Mariner
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    Default Re: a wiring diagram for 1960-1965 Johnson 40hp - review

    One side of the coils should be grounded to a screw under the flywheel. The other side should be connected to one of the M terminals. Ditto for the other coil. Maybe your ign switch is putting voltage onto the coils?

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