"When I spoke with the people in parts, I was told when the conversion was done (if it was done properly), the starter should have been rewound for a 12 volt system, and the ground polarity reversed, from a negative ground to a positive ground."
The parts people are wrong. If your 340 came with 6 volts (IH was changing to 12 volts in 1958), it was positive ground. A 6 volt starter works fine with 12 volts, no rewiring is necessary. I assume you have an alternator, if so it HAS to be negative ground. If it has a 12 volt generator, most are negative ground, but it will work with positive ground also-the generator must be polarized no matter what the ground is. You do not polarize an alternator. If your ammeter shows discharge with the engine running AND charge with the lights or ignition on and the engine off, reverse the wires on the ammeter.
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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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