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 - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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