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 - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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