Not being there and not knowing the farmer Billy Bob jury rig "fix" one can only "guess" but here goes no warranty.
I suspect if its a 6 to 12 volt conversion the original 6 volt coil was retained and an external series voltage dropping (12 to 6) Ballast Resistor was added. Then he may have added a momentary push to close switch that by passed the ballast resistor as long as the button was depressed. That would result in more coil current and what he calls a "hotter spark"
Many tractor companies used such a similar arrangement, HOWEVER it was done automatically without having to push any manual switch by use of a solenoid or a mechanical switch section on a starter switch.
When he said "power drops down to about 4 amps while starting" he may have meant with the 6 volt system the voltage dropped down to 4 volts?????
Thats my best guess not being there and it may be right or it may be wrong. I may think of others but that's enough for now.
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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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