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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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