You covered all the correct bases. I am using a 6 volt coil with a ballast resister. And, yes I did change the polarity everywhere. I even added big magic marker notes at the battery reminding myself to connect the ground cable to battery ground.
After the tractor quit I pulled plugs and laid them by their respective threaded ports. I had viseable spark but must admit it was weak. I now know a weak spark doesn't get the job done.
I tested the points with my ohm meter by loosening (after marking the position) the distributor and twisting it back and forth. With the points closed I was reading no resistance. This made me believe the points were ok.
At that point, in desperation, I installed a kit including points, condensor, and rotor. Wallah!!! the tractor started and ran great.
I followed up by checking the timing with a light and it appeared "right on" at 4 degrees advance.
Gary
PS: I am considering converting to a 12 volt coil and getting rid of the resister. Some 12 volt coils advertise an internal resistor...I don't quite understand that.
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