I called them "12 volt" coils because they are marked "12 volts." I pretty much just go by the total resistance in the primary circuit. There are plenty of later Harleys with the two-plug-per-cylinder conversion - but those started out with a different ignition to start with. Most are breakerless and some of those breakerless systems give instructions on how to wire them IF they are rated for the load of dual coils.
This bike is a 1968 and I can find no information on a system like this. If it was a 72 or newer, this would be easy to figure out.
I think we (consumers) are kind of spoiled when it comes to things like this since some engineer somewhere has hopefully already figured things out. I guess that is why tractor companies bought pre-designed ignition systems and did not create their own.
I am thinking now of just using one spark plug per cylinder and not using the extra plugs and 2nd coil. Points ignition, stock, calls for a 4 ohm coil and no ballast resistor with a 12 volt system. Seems kind of a shame to waste all the expensive machine work someone did before me to make this thing use dual plugs in each cylinder. That said, unless I see some actual test data somewhere, I find it hard to believe the extra plugs really make a difference in performance. But, I guess I could be wrong?
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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