Good questions here are my questions and concerns:
1) Do coils normally run warm?
Subject to their location, ambient temperature, coil current and physical heat sinking IF the correct coil and voltage for the application........
IN GENERAL they may run a bit WARM but usually not so hot you cant keep your hand on them.. NOTE as a coil overheats, high voltage breakdown can happen !!!
2) Are there specific coils that are designed to run with electronic ignition modules?
REGARDLESS if mechanical points control coil current orrrrrrrrr an elec switch controls coil current THEY ARE RATED FOR THE PROPER VOLTAGE AND CURRENT to yield an adequate spark. NOTE HOWEVER elec switches or points HAVE MAXIMUM CURRENT RATINGS so an elec switch, like points, need to use a coil THAT DOES NOT EXCEED X CURRENT (typical 4 amps)....THEREFORE an elec switch might ??? use a specific coil and you will find the answer to that FROM THE MANUFACTURER NOT HERE. That all being said, and assuming an elec switch can handle 4 (typical for points) to 5 Amps A COIL THAT WORKS WITH POINTS SHOULD WORK FINE WITH AN ELEC IGNITION Typically as long as voltage and max current isnt exceeded NO SPECIAL COIL IS REQUIRED (but confirm with manufacturer)...
3) Thoughts, suggestions
If it was converted from 6 to 12 volts and the old 6 volt coil was kept and no external series voltage dropping (12 down to 6) was added THE OLD 6 VOLT COIL RAN AT 12 VOLTS WILL OVERHEAT BAD !!!!!!!!!!!!!!!!!!!!!
BOTTOM LINE on a 12 volt tractor you need to either USE A NEW FULL 12 VOLT RATED COIL orrrrrrrrrr a 6 volt coil PLUS a ballast REGARDLESS if points or Elec
BEST PURE GUESSES NOT THERE Id suspect its the wrong coil versus an elec switch issue as EITHER just turns coil current on or off and coil temp would be near the same
TESTS measure coil current with ignition on and coil conducting current if say 3 to 4 amps I consider that okay (right coil) butttttttt if its like 5 or 6 to 8 amps THATS TOO MUCH IT WILL OVERHEATS MUST BE WRONG COIL such as a 6 volt unballasted coil on a 12 volt tractor REGARDLESS if points or elec ignition
John T See what others think and if they can add to or correct this ?????
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