If this is 6V, I assume it has a generator on it. I am pretty sure the generators require positive ground unless you have one that is reverse polarized, but I do not know why you would. For starting the generator can be disconnected to make that a non-issue. It will run fine without the generator for a few minutes. At least long enough to get it started to see what else is wrong. Coils are usually marked positive or negative ground. I do now know what this one has, or if it is even has a 6V coil. I am not a coil expert, but I can see a 12V coil, or a 6V coil installed backwards (wrong terminal relative to ground) causing problems. Especially if you are trying to run a 6V system negative ground with a coil that is expecting a positive ground. A 6V battery with a 12V coil would most certainly not work.
Bottom line: put the battery in positive ground to match the generator. Then make sure you have a 6V coil installed, also with positive ground. (Note: my 340 had its coil in backwards and still ran, so this may not matter). Link provided to some interesting reading about coils. I make no claim to its accuracy.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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