Since it has been converted from 6 volts, most likely it had a resistor added before the coil to continue to use the original coil. At best you are going to see about half of cranking voltage at the coil. Cranking voltage may be down around 10 volts.
Make sure the points and condenser are in good shape. There should be no more than .1 volt drop across any connection.
If you were to replace the magnetic starter switch (mounted on the starter) volt a 12 volt type with 4 terminals you could add a resistor bypass wire and have full cranking voltage at the coil for starting.
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Today's Featured Article - Talk of the Town: What's The "Stuckest" You've Ever Been? - by Edited by Kim Pratt. Another great discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "I was about 14 (part of the problem) when I got stuck. I was disking with a cab equipped IH 966. The window was dirty and I was driving into the evening sun. It was hard to see and it was my first pass down the field. I got the tractor so stuck that the underside of the tractor was resting on the ground. My uncle wanted
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