I bought this 8N side mount distibutor a month ago. It started hard but started and ran and he drove it up on my trailer so I know it will run. He had a 12V battery and a coil strapped on and it was a 6V system. I have removed both the old coil and the strapped on coil and put one on right. I also have changed the points, condensor, plugs, wires, distributor cap, rotor, and have changed it over to a 12V system with a one wire alternator, I used the kit from Yesterdays Tractor. I have a new battery, new ignition swith, new resistor and have no spark. I have 12V out of the switch, 12V to the resistor, 12V coming out (should a resister not resist?) and 12V going to the coil and out of the coil to the distibutor and to the points. If you are still reading this long question...thanks....and I would appreciate any help I can get as to what to do. I have spent many hours on this tractor trying to get it to run.