The automotive starter solenoids come in different "flavors" of internal wiring, yet sometimes use the same "generic" case with the "S" and "I" markings. If you have a real "Ford-type" starter solenoid with "S" and "I" markings, and the metal base is grounded, applying 12 Volts to the "S" terminal SHOULD make it pull in. The "I" terminal gets switched to straight battery voltage while starting, to provide more promary ignition voltage on a gas engine. (Not needed with your diesel.) If you have the solenoid's base grounded AND 12 Volts to the "S" terminal, it should kick in unless it's defective, or is a different type of solenoid with the other end of it's coil connected to the "I" terminal. Make sure it's in neutral, ground the "I" terminal, and try again. If it kicks in, you can keep the ground on the "I" terminal and use it that way, or get the correct solenoid. MAKE SURE the neutral safety function is working before using, or allowing others to use the tractor!!!
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