I am guessing you have confirmed that you have 12v. from the battery at the ignition coil.
Is the insulator where the small wire from the coil to the distribuitor shorting out? (p.s., if the insulator where the wire attaches to the distribuitor is homemade or patched with slilcone that can be the problem. The silicone can actually carry a current to ground)
If the points are closed you can work them with a screwdriver and just test of the high tension lead from the coil. This eliminates any problems that may come from old bad wires or a shorted rotor or cap.
A temporary coil or plug wire can be made from any stiff wire as long as it stays about 1 inch from anything it could short to. It can even be bare as long as a spark can't jump to ground. There was an old tractor at shows around here that had barbed wire for plug wires at shows around here in NC about 30 years ago.
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Today's Featured Article - Converting from 6 Volt to 12 Volt - by Chris Pratt. It's a common problem for old machines especially when the weather starts to dip below 40 and the tractor isn't fired up as often. You are probably used to the 12 volt Diehard, charged with 200 amp alternator of your 3/4 ton that always is ready and always starts. It's this type of experience that brings about the many queries we get for 12-volt conversion kits. Since only a few kits are available (we sell kits for the
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