A one-wire Delco 12SI when installed properly will self excite when the engine reaches 1400-2000 RPM. All depends on the size of the pulley on the alternator. All my tractors run faster then that. I never regarded it as an issue. If your tractors can't achieve that, you've got me wondering what the heck you've got?
Even a 3-wire has to spin 1600 RPM at the alternator to work, but what counts is engine RPM versus alternator RPM. All in the pulley ratio. Most cars and trucks run somewhere around 3 to 1 ratio. So if engine is idling at 800 RPM the alternator is spinning at 2400 RPM.
As to cost? I buy one-wire regulators new for $10 each. Same as I pay for three-wire regulators.
The ideal setup is a three-wire actually hooked up with three wires and using the sensing lead AT the battery. That is rarely done on tractors. Most posts I've seen here take the short-cut and actually use the "three-wire" hooked up with two wires to the tractor. When done like this the charge-voltage reading is taken at the alternator and does not account for voltage drop AT the battery.
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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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