Ignition switch wiring

Discussion in 'CT70 Reproductions' started by blazinar, Aug 19, 2016.

  1. blazinar

    blazinar New Member

    Aug 18, 2016
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    I am working on a 72 CT70 with a Piranaha 140 clone engine in it and I want to wire the stock ignition switch to to work with the CDI. Anyone done one of these? I found some diagrams online but I am not sure I am reading it correctly.
  3. racerx

    racerx Administrator
    Staff Member Administrator

    Jul 10, 2005
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    It's a lot simpler than it appears to be, while trying to match the color-coded spaghetti to the wiring schematic. Your CDI kill switch lead needs to be connected to the switched ground lead on the ignition switch, which should be color-coded black. Verify with a continuity tester, it should only ground with the key in the "off" position. With respect to integrating a K0-K1 switch, that's it. The kill function is achieved by grounding-out the primary side of the ignition...simplicity itself.:)

    The rest of the keyswitch leads control lighting & charging circuits. The rest of your CDI leads should all be plug & play, via the modular connector on the stator...with the exception of the primary ignition lead which may be be discrete (not part of the 6-pin modular connector bundle). Not to worry, the primary coil lead should have a single bullet connector that goes to the HT coil.

    If you don't have a wiring schematic for your engine, source one from the vendor who sold it to you. Chinese engines have a number of color-code variations.

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