If the coil is a 12v coul it does not need a resistor.
One way to check, hook a voltmeter set to read 12 Volts DC to the batt in terminal on the coil. If it reads 12 V then close the points or ground the lead going to the points. If the voltage on the input side of the coil drops to about 6 colts then there is a resistor somewhere between the input of the coil and the 12V supply. If it does not drop from 12V to about 6 volts with the other side of the coil grounded and you do not have a 12 volt coil you need to get one. simplest way is to just find a 12V coil at napa and put it in there.
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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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