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There were many 3 wire 12v gennies in the 60's, .. my 1966 int. cub has one on its oem 12v electrical system... I think there was a 12v kit for the NAA available too...and also occasionally, some people had their 6v gennies rebuilt to 12v.. we call these the 'stealth' conversion, etc. Some have also reported that the 1 wire, 3rd brush gennies could do a higher output than 6v.. though there is some contention on that one.. On the 3 wire genny, usually you find a field connection, a armature connection, and possible a ground. Ground is easy, it is probably the lug on the housing that appears common to the housing... no insulating bushing or washer, etc. The field terminal is also usually in the housing, and should have an insulating phenalic washer, or rubber washer / grommet. The armature is generally on the endplate, and is where the 'charge comes out'. The armature is connected to the armature tab on the regulator, and the field on the genny is hooked up to the field tab on the regulator, and the batt tab on the regulator is the charge wire to the battery.. ( or ammeter, etc.. wherever.. ).
Sometimes the regulator will have a ground terminal too... that can be grounded, and should also be grounded to the genny so that all ar on the common ground. A quick way to test the genny, is to disconnect the regulator, and start the tractor... attatch your test leads from the arm terminal on the genny to ground.. Have another wire and jumper from ground to the field terminal momentarily.. this is full fielding the genny.. and you should show voltage then. If not, shut everything down, and jumper the armature terminal to the battery terminal to polarize the genny.. there will be a small spark.. try the test again.. should have output if the genny is good. If so, reconnect the regulator and test for voltage at the armature terminal again while running. If you have it, you should be showing a charge on the ammeter.. if not, the cutout relay in the regualtor may be stuck.. to test, disconnect the batt terminal from the regulator, and test right at the batt terminal.. if the genny and reg are working.. you will have votlage there.. Soundguy
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