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Cap'n - If there is nothing identifying the regulator voltage (look carefully for a voltage/polarity stamped on the underside of the base) you can still determine whether it’s 6 or 12 volts using a 12 volt battery: Remove the regulator cover and identify the cutout relay. It will be the relay with 2 windings - a few turns of heavy wire wound onto another of many turns of fine wire. Also it will be the only relay with it’s contact points held OPEN by spring pressure. (The voltage and current regulator relay contacts are held closed by spring pressure). Ground the regulator base to one post of the 12 volt battery (doesn’t matter which one…). Now while watching the cutout relay armature, use a jumper wire to momentarily connect other battery post to the regulator’s GEN terminal. If the cutout relay operates (closes it’s contacts) you have a 6 volt regulator. But if nothing happens the regulator is 12 volt. --- HOWEVER as a practical matter I discourage installation of a regulator unknown heritage! Regulators are rated not only for voltage but are matched for also for the current characteristics of a particular generator. If you install a regulator mismatched for current rating you risk burning out your generator. Further I consider regulators “wear items” much like like fan belts, brake linings, etc. Their performance and reliability deteriorates with use and age. Also....should you happen install a 6 volt regulator onto a 12 volt system, you're at risk for a dead battery, burned out generator or even an electrical fire. Don't do it! Bottom line: Spend $35 - $40 and get the correct regulator for your tractor than mess with a used one of unknown heritage!
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