Jessie, If you have two resistors the same size in series, there will be an equal voltage drop across each. So, if the ballast resistor is equal in size to the coil's resistance, won't there be 6v drop across the ballast and 6 volts applied to the coil right?
Then to charge a 12v battery the alternator puts out 14+ volts, so then you would have a 7 volt drop across ballast and 7v drop across coil.
A previous owner converted my jubilee to 12v and when I turn the key on, my coil is only getting 6v when the points are closed and engine isn't running, ballast is dropping 6 v. It's worked that way for me with no issues. I would think the larger the ballast, the less likely you are to burn the points.
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