The secret is to limit primary ignition current to the range of 3.5 to a little over 4 Amps, (points CLOSED engine stopped, ignition switch "on") to prevent overworking the points so they quickly burn and/or overheating the coil.
The CORRECT combination of the original 6-Volt coil AND external ballast resistor with the proper value will achieve this and even allow for a "starting bypass circuit" to give full voltage to the coil for cranking, if desired.
OR, a "true" 12 Volt coil that needs NO ballast resistor will work, instead. (NAPA IC14SB, for example.)
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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