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Take a flashlight. It has a battery and a bulb, some metal tabs and a slide switch. If the slide switch connects the adjacent terminals, current flows from the battery thru the wiring and lights the light. Same holds true for the solenoid. It has 2 circuits. 1. Is the high current circuit made up of the battery, wiring solenoid switch (high current terminals) and starter. 2. Is the low power circuit made up of the ignition switch, start switch (function) and primary (low current) solenoid terminal or terminals. To get the solenoid to energize you have to put voltage (6 or 12v as required) across the solenoid. Some only have one small terminal. These require the body (case) of the solenoid to be in good contact with the tractor chassis. On the Ford type safety start systems, voltage comes from the ignition switch (to a small terminal on the solenoid) but the start function is a push button on top of the transmission which, when depressed, grounds a 4th terminal (2nd small terminal) which completes the primary circuit and energizes the solenoid. If you have the safety start function and only have a 3 terminal solenoid it will not work. Mark
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