The guys at the tractor auctions do it all day long by connecting to the starter, NOT the Battery...
Assuming you have a Positive ground system on dead unit.....1:Hook cables to running 12 V Tractor. Red to Positive, Black to Negative. Use the metal on the tractor to connect to grounded terminal on the 12 V runner. 2: Hook Negative cable directly to Starter cable at the starter 3: CHECK YOU ARE IN NUETRAL!!!!! !!Better yet to have another person on tractor, brakes set, clutch in also!
4: Touch positive cable to frame of tractor to start tractor. This assumes you have ignition on and the battery has enough umph to fire the coil.
5: Do not make a practice of cranking for any extended length of time as you can burn out starter with 12 volts. Much better cure would be to go thru the coil and distributor and ignition switch on the 8N, so it will start easier. My 2N had been a bear to start, but when I replaced the coil with one from Ford and set the points correctly, it now starts instantly. Cool, huh?... By the way.... It may be a good idea to recheck point gap at all 4 lobes on the distributor cam. Mine seems to have 4 different gaps, as if it was machined incorrectly. The bushings are fine, no play in the shaft , yet the points open .008 -.020 depending on the location... Made the tractor act like it had a bad cylinder when I set it on the .020 lobe.. I set it on the .008 lobe and once again I have 4 cylinders...
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