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 - A Tractor's Point of View - by John Manley. I began my life on August 3,1941. I was actually built at different times and days but I was officially an M Farmall on August 3.I was real nice and shiny. That�s me, in the old picture, third from the left. I was loaded on that train and sent to a little town in South Carolina. I didn�t get to see much of that town. I was moved off the train fast and on to the dealer�s
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