Aaron, First of all I do think it is probably the longest post I have seen on this forum if that means anything. I really hate to get in this thread as there are some exceptional electrical folks who support these issues far better than I can. First, since you seem to have little knowledge about these old Farmalls so I'll just give you some info. you might find useful. First, they were all 6 volt positive ground when built. When they are converted to 12 volt they must be changed to negative ground as that is how the alternators function in almost all cases. That small wire you mention connecting to the starter post is most likely a 12 volt bypass to put 12 volts to the points for a hotter starting spark and your tractor would revert back to 6 volt when the starter button is released if wired correctly. There are some schematics on this site provided by Bob M. which you might find useful but there are others who will most likely jump on this thread and hand walk you through the conversion process. I've converted one Farmall to 12 volts and it is very simple if you follow all the steps and have a good diagram. I think you need to start and review what you have on this tractor first as it is new to you and something simple is most likely your problem. Check your battery and make sure you have the battery hooked up with a negative ground and the positive cable is running to the switch and starter. The original battery cables were size 00 which is quite heavy in size but they can be somewhat smaller with a 12 volt battery. I'm going to let the real electrical folks jump in and walk you through the trouble shooting process as that is not one of my strong suits. Just remember that when your tractor was built they were engineered to be quite simple and aren't very complex but very simple in design. Hope this helps with a little info for starters, Hal.
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