Posted by John T on January 03, 2010 at 13:36:57 from (66.244.97.31):
In Reply to: ceramic piece off coil posted by Kerry (N.S.) on January 03, 2010 at 11:14:49:
If its maybe 1/2 square by 2 1/2 inches or so long (often dull white or grayish) with a wire terminal on each end, one to the coil one from ign switch, and if its a 12 volt tractor that uses a coil designed for 6 volt operation, I agree with Scotty, its a voltage dropping (12 to 6) Ballast Resistor. They can go bad, usually by opening, use an ohm meter to test its resistance and continuity between its termnals with all else removed and it should be in the vicinity of 1 to 2 ohms or so. IF ITS AN OPEN CIRCUIT ITS BADDDDDDDD.
If it is a ballast resistor and its good you can turn the ignition on and use a voltmeter and if the points are closed Id expect near battery voltage on its input (from ign switch) but more like 5 to 7 volts on its output (to coil).
If its NOT an ignition ballast it may be some sort of insulator or wire holder device assuming its NOT something thats broke loose from the coil or distributor.....
A 12 volt tractor often typically uses EITHER a coil designed for use at 12 volts (some call them internally ballasted) OR SOME OTHERS use a coil designed for use at 6 volts and an external series voltage droping (12 to 6) ballast resistor. If you apply 12 volts to a coil that is designed to operate only at 6 volts, it may overheat because it doesnt dissipate the heat generated from the current that would pass throught it if a full 12 volts (twice its design) were applied.
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