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 - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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