Posted by John T on May 24, 2023 at 08:09:59 from (45.16.200.171):
In Reply to: Coils posted by muleman51 on May 24, 2023 at 05:40:22:
Good morning Muelman, in over 50 years as a farmer and used tractor dealer having to repair hundreds of old tractor ignition problems, Ive seen more condensor or points problems versus coils in what you describe. Thats NOT to say coils cant go bad they do indeed and among the causes are:
Overheating.....Sometimes where they are physically located to close to the exhaust manifold,,,,,,,Not mounted with a metal bracket that can help transfer heat
Wrong coil causing overheating. On a 12 volt tractor you can use EITHER a full true 12 volt rated coil, they have a LV primary resistance around 3 or so ohms orrrrrrr a 6 volt coil which has around 1.5 ohms PLUS an external series voltage dropping (12 to 6) ballast resistor....If you use a 6 volt coil at 12 volts (without ballast) it overheats !!!!!!!! NOTE a coil labeled 12 Volts requires ballast is more like a 6 volt coil and would overheat unless a ballast is used JUST LIKE IT SAYS
HIGH VOLTAGE if the charging system keeps the battery at 14+ volts for longggggg periods that can raise coil temperature.
Ive seen condensors fail when they warm up so its NOT a coil problem
Try a coil from NAPA or Brillman versus a cheaper big box store see if that helps, insure the condensor isnt the cause of failure when warm??
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