Reply To: Johnson 1949 HD 25 No Spark

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January 7, 2026 at 6:09 pm #303129
Buccaneer
Participant

    US Member

    Got my HD-25 magneto back together today, and thought
    I’d share this video in checking the kill circuit.

    https://youtu.be/mHWvXYPbb8w

    Testing that the circuit is working correctly, and nothing is grounded.
    When working correctly, when the brass contact on the bottom is pushed
    against the insulated post, the two wires that go to each set of points
    should have continuity to each other, and not the mag plate itself.
    When the kill wires are hooked up to the point sets, the circuit kills
    the engine by grounding both circuits to each other.

     

    Prepare to be boarded!