Posted by Bob M on November 19, 2009 at 12:59:39 from (151.190.254.108):
In Reply to: 400 d posted by tonastoy on November 19, 2009 at 11:46:39:
If your tractor still has it's original 12 volt coil, a ballast resistor (the "porcelain" you mention) is not required.
However if someone swapped it for a generic autmotive (externally ballasted) 12 volt coil a ballast resistor is necessary to limit coil current and prevent burning the points.
Regarding an ignition cutoff when running diesel, if memory serves there's a switch on the front end of the intake manifold to open the coil primary circuit when the starting lever is in "run" (diesel) position. Yours may be out of adjustment or bypassed.
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