by application your tractor should have a lucas generator model number 22703 and several others. the regulator could be under the dash it will be a black bake a lite cover if original it will say lucas on cover and have the wiring plug code. you should be able to follow wires coming from generator and find the regulator if it has been converted to alternator possibly post picture and someone here will recognize it also can you post the problem you are having very easy to test generator with a volt meter good luck