does your starter have any numbers on it. this should be basic 1 big wire from battery and 1 wire for solenoid and possibly 1 wire as ground if it does have 2 wires to solenoid you can hook them up backwards if so the starter wil ldo nothing if this is whats going on move the 2 small wires on solenoid and see what happens also if possible post a picture of the starter even if on tractor some of us here will probably recognize it