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 - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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