Thanks John, saved me lots of researching. So if I understand correctly, the OEM solenoid is energized and sends a current to the starter motor and since the starter soleniod is connected to the motor, it engages both the starter solenoid and motor at the same time. Simple, thanks. So to completely to answer this topic and to be painstakingly clear, we have three wires from the alternator, and in my case a Kubota Denso. The big pole wire should be at least 8 ga. for a 40amp (maybe 4 ga. for higher amps), and is connected to the "A" terminal on the regulator control box, which in turn is connected to the battery side of the oem soleniod. Then you have two wires that should have a "T" formation plug.
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As you can see from the above pics, the horizontal spade is associated with the green wire, and the vertical spade connects with the yellow on the plug. To confuse this some more, I have seen this same connector with yellow and red and red and black. But going with our horizontal and vertical orientation, the horizontal spade is for the "exciter" which is connected to the control box which has a 12v current when the ignition is switched on. The vertical spade is for the alternator warning light in the dash. But from what I understand these two wires are tied together and joined at the voltage regulator box at the "D" terminal, which I assume is a 12v source when when the ignition is switched on. With the ignition switched on, it supplies a 12v current, but when the alternator is not being rotated, the yellow wire is supplying a ground signal, which in turn lights the warning light. When the alternator starts turning, it puts a 12v signal to the yellow wire and then defeats the warning light and turns it off. We eliminate terminals E which is the ground and terminal "F" which was the wire from the old Dynamo. Not sure if it would matter if "E" was eliminated or left in place, but effectively it would defeat the control box completely thus turning it into a simple terminal box. Let me know if I got this right. Thanks Allan