You may have slightly excessive voltage drop from battery to the coil but it is not far off. This is the very exact reason that almost all manufacturers use a external ballast in ign circuit. They use that extra terminal on the starter solenoid or starter magnetic switch and run a wire that goes directly to the ign coil, bypassing the external ballast when cranking. Your normal cranking voltage at battery will be about 10.5 volts so you can see you will be getting only about 9.5 volts feeding your 12 volt coil while cranking. This lower voltage will then reduce the amperage flow through the coil and it is the amperage flowing that creates the magnetic field in coil, and when points open, field collapses and creates high voltage in secondary circuit of coil. Less magnetic field, lower secondary voltage available to fire plugs. The best way to , (if I was working on your tractor,)get a better starting machine in your case is, six volt coil , external ballast and different magnetic switch on starter that has the terminal for ignition bypass. That way you would be feeding about 9.5 volts or more to the coil during cranking. Good hot spark.
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Today's Featured Article - Experimental Tractors Article - by Danny Bowes (Dsl). Tractor technology appears to have nearly hit it's pinnacle of development. If you agreed with the subtitle, you are rather mistaken. Quite, actually. As a matter of fact, some of the technology experimented with over 40 years ago makes today's tractor technology seem absolutely stale by comparison. Experimentation, from the most complex assembly to the most simple and mundane component, is as an integral a part of any farm tractor's development
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