Originally positive ground. You can tell which way was by looking at the coil. If the NEG terminal goes to the ign switch, it's probably still POS ground. Before you go to start it, polarize the generator. Polarizing the generator is what tells it which pole is hot and ground. Polarizing is just taking a piece of 12 gauge wire and momentarily jumping across the BATT terminal and ARM terminals on the cutout relay. The cutout relay is that box on top of the generator with 2 terminals on it. If it happens to have a regulator, (3 or 4 terminals) the same applies.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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