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The large stud on the rear plate is the armature, that is where the voltage 'comes out'. Measure from there to a good ground on the tractor. With the genny running, you should get 7-8 volts... varies a bit.. but will be more than 6.. and shouldn't be way high like 9. The other two studs on top are field and ground. To tell them apart, one of the studs will have a fibre or rubber insulating washer/gromet under the washer.. may be hard to see due to paint/age, etc. that is the field contact. The other stood, if you look closely, is common to the case... no insulation.. that is of course, ground. One of the biggest problem with these 6v tractor electric systems is bad contacts.. specifically at the starter , and ground. Replaced vregegulators sometimes mount differently, and don't have good ground contacts, but is very important that they do. Let us know what you find.
( have you polarized the genny if you have removed it for work.. etc.. ) or is this just a routine health checkup on the tractor... What is your ammeter saying. Soundguy
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