I recently installed an electronic ignition assembly on my 9N with front mount distributor. I also replaced cap, rotor button, plug wires & plugs at same time. It ran great for a couple of weeks (probably 7 to 8 hours total run time) then the ignition resistor went out, it was extremely hot to the touch. I installed a new one and the tractor cranked up and ran for about 5 minutes, then quit. The new resistor was also extremely hot and when I tested it it showed no resistance. I decided to check the coil and it shows no resistance between top post and spring on bottom. The tractor was converted to 12V before I got it so I don"t know if the coil is 6V or 12V. Shouldn"t there be some resistance between these two points on the coil? If the coil is bad and I need a new one I will probably get the 12V coil for it. If I do install a 12V coil do I still need a resistor in line? I checked behind the dash and did not see any other resistors in the wiring.