If it"s gas powered and 12V it"s been modified.
All of the X01 series tractors (gas & diesel) had a 4 post starter relay. One big post connects to the battery (it doesn"t matter which one) and the other connects to the starter. One small post (again it doesn"t matter which one) connects to the side of the junction block that is "hot" only when the key is ON and the other one connects to the starter button on the transmission for the ground. If the key is ON and you push the starter button the coil inside the relay (solenoid) energizes and pulls the contactor across the two big posts sending power to the starter. If the key is turned OFF pushing the starter button does nothing because there is no power to the coil inside the relay (solenoid).