If it's a 4-wire solenoid (not ignition switch), it should have two big terminals, and two small ones. The small ones should be marked S and I for Start and Ignition. Back in the day, the I terminal put a full 12V to the coil when starting, bypassing the ballast resistor. The resistor made it 6V on the coil when running so it wouldn't overheat.
You don't need to use the I terminal on your tractor. You need battery on one big terminal, and maybe pick off your ammeter/switch feed. The other big terminal is the starter. Hook your small switched start wire (from the key switch) to the S terminal. The solenoid needs to be grounded well to work. Also, the battery and engine need to both be connected to ground very well.
Welcome to the OCC forum Jason! Good Luck!
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Jim in Lafayette, CO
Cub Cadet 122, 126
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