The JD 50/60 gasoline engine was originally + ground, but most common alternators are built to operate with negative ground only, so the tractor is likely converted to - ground. The conversion from + ground to - ground consists of switching the polarity of the battery connections, switching the ammeter connections and switching the coil primary connections. I would leave it - ground. It will match the polarity of 99% of the electrical systems running today. Much less chance of a mistake in connecting booster cables and battery chargers,plus a replacement alternator is an off the shelf - ground unit instead of some oddball + ground unit that no one stocks.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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