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 - A 1937 John Deere Unstuck - by Gary Hickman. Here is my story of how I got the pistons out of a 1937 JD B that the engine had been stuck for about 14 years: About 12 years ago my Dad gave me one of the tractors I ran as I was growing up on our farm in central Nebraska. The engine on this tractor, a 1937 John Deere "B", had been stuck for 2 years before he gave it to me. This last spring (1999) I hauled the tractor to our 2 acre lot in St. Libory Nebraska where it joined my antique machinery collection, at that time a 1929 Caterpillar T
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