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Let us know whether you have the later 8n genny.. it will have 3 terminals on it.. one large armature stud on the back .. and a field stud on top.. ( it will have a rubber or phenolic washer at its base as an insulator..) and a ground terminal.. a stud that will be common with the genny casing. If it is an early 8n genny.. it may also have an adjustable brush in the back. In any case.. check the voltage at the battery before starting.. and again after starting.. then run at 2/3 throttle. If the voltage goes up.. you have a 12v genny... If the voltage goes up.. check voltage at the armature, and see what it reads.. if it reads 6-8v or nothing, shut it down. You can try to polarize the genny.. however here is where you run into a problem.. the oem 8n gennies were 8-circuit... later gennies on ford tractors were b-circuit... and both polarize differently. If you are not 100% sure of what you have.. you may want to take the genny and regulator in to a rebuild shop and see what they say. There are a few ways to test your self.. if you feel like getting your vom out.. etc. For instance.. on a b-circuit genny setup.. the regulator field tab provides voltage to the genny field tab.. so you could remove the field wire at the genny.. and check from the field wire to ground.. if you get voltage.. the regulator at least.. is for a b-circuit system.. I'd still vote on taking it to a rebuild shop as you never know what you may have. Jim cox will be able to give you more info. Soundguy
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