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#15983
debe
Participant

    Mercuryman, Before you make a double one with a common ground, try a single one first to find which polarity the module needs to give a reliable spark. It depends entirely on the type of ign coil & its polarity. Even with the original Atom modules the polarity was trial & error. Also makesure the switching transistor is insulated from the heatsink. I used silicon rubber insulators.