The 3 wire is cheap n easy to install n readily available, it doesnt require any high RPM to excite and doesnt draw any trickle discharge when setting. I dont use a diode anymore (although theres nothing wrong with its use) but instead a safety current limiting resistor of around 10 ohms to provide at least some degree of protection. It serves the diodes purpose of preventing back feeding the coil so the tractor stops running when you turn the ignition off plus can limit the current. It or the diode will work just fine, its your choice.
If at Neg ground the coils lil - is what wires to the distributor and if the ammeter was originally for Pos grnd its leads need swapped so it dont read backwards
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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