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If its a battery powered coil ignition instead of a Magneto, you gotta EITHER add a series voltage dropping (12 to 6) external Ballast Resistor in the ignitions primary circuit AFTER the Ignition switches IGN output and BEFORE the coil OR ELSE get a true full 12 volt rated coil (what some call internally ballasted). The added External Ballast should be somewhere near the same ohms as the 6 volt coils primary winding as measured between its lil + and - terminals, and typical values are in the 1.5 to 1.85 ohms range and they are around 25 to 30 watts or so power rated, sometimes referred to as ceramic wirewound bathtub style. If you wanna get fancy and go with a 6 volt coil and an external series ballast, you could add a ballast by pass circuit during start up for a hotter starting spark, it puts battery voltage on the coil ONLY while cranking but then drops back to the ballasted voltage around 6 when running. It can help starting in extreme cold temps and/or a weak engine or batteyr or starter. In the event you change battery polarity as most all alternators require negative ground, you would have to swap the ammeter leads so it dont read bass ackwards and swap coil leads also so its polarity matches. Of course, get 12 volt lights. John T
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