Posted by John T on August 20, 2009 at 15:05:56 from (66.244.97.31):
In Reply to: HOT COIL posted by Bonnie Tallman on August 20, 2009 at 14:26:47:
On that 12 volt tractor you claim youre using a 12 volt coil, and thats all fine n dandy IFFFFFFFFFFFF its really a full true 12 volt coil.
I say that because if a coil is labeled: "12 volts for use with (or requires) external ballast resistor" its in reality a 6 volt coil and indeed requires the external ballast (just like it says DUH) otherwise it overheats badly.
A full true 12 volt (some call internally ballasted) coil may be labeled "12 volts" or "12 volts NOT for use with ballast resistor" and thats the kind you need on a 12 volt system with no external ballast. Its internal primary winding resistance between its lil + and - terminals will be in the 2.5 to 3.5 or so ohms range if its a full true 12 volt coil no ballast required.
Theres a condensor inside the distributor thats in paralell with the points, Im not sure whats going on with one at the coil unless its there to reduce radio interference.
Even the right coil (or coil + ballast) gets fairly hot if the ignition is left on a good while n shes NOT running.
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