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Polarize that a-circuit unit with the tractor -not- running. An yes.. you can motor test the genny by slipping the belt off of it.. removing the f wire from it's field, and jumpering battery and armature at the regulator... not.. take a short piece of wire and ground the field.. this should make your a-circuit genny spin like a motor... most gennies that will motor, will also charge. Yes, you can check the reg.. but it involves using a couple batteries, and a high capacity battery charger, and a vom meter.. Essentially, you hook up your vom across the tractor battery.. make not of the reading. Now, hook your battery charger up to your other battery.. set on a 10a or better setting.. but not a 'starter booster' setting. now.. use a jumper cable to ground the test battery to the tractors frame... observe same polarity as your tractor battery. now, remove the armature wire from the genny, and then touch it to the test battery's hot post while looking at your vom across the tractor battery. When you touch the armature wire to the hot post of that test battery which has a charger on it.. the genny will see that as an output of a genny, as the voltage there will be higher than the voltage of the tractor battery. I.E... the tractor battery will be setting at 12.6v.. and the voltage of the charging battery will be at about 14v.. etc. This will make the cutout relay pull in, and then the tractor battery will jump up to read the same or nearly the same as the test battery, as the battery charger will then be charging both... You should hear the vr click when the cutout pulls in, and click when you pul the armature wire off, as the cutout opens again.. you are essentially fooling the vr into thinking it is getting charge voltage from the tractor generator. The 'test' battery is only there to even out the pulsed dc voltage from the battery charger... Soundguy
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