Posted by John T on July 22, 2021 at 13:47:00 from (45.16.200.171):
In Reply to: Weak spark posted by Ted in NE-OH on July 22, 2021 at 11:23:13:
Ted you ask a good question ' Is there anything that kills coils?'
Sure, excess current or excess heat are a couple that can. If you have a 12 volt tractor and a CORRECT full true 12 volt rated coil (around 3 ohms) Id expect no more then 4 or so amps of coil current. If its much greater like 6 amps the coil can overheat and be damaged. That could be caused by an incorrect too low of resistance coil. A full true 12 volt rated coil would have around 3 ohms of LV Primary resistance thereby allowing about 4 amps of coil current HOWEVER if it was a 6 volt coil (around 1.5 ohms) and drew 8 amps it would overheat and be damaged. CHECK YOUR COIL RESISTANCE AND CURRENT WITH IGNITION ON AND POINTS CLOSED Id expect 3 to 4 amps if allllllllll is well ???????
If the coil is NOT the problem but the spark is weak, you could have burned pitted corroded mis gapped or carboned up points (Always check and suspect points first),,,,,,,,, A faulty condensor,,,,,,,,,,,,,A bad/resistive connection causing excess voltage drop (check coil voltage with ignition on and points closed, if its way low that can cause a weak spark),,,,,,,,,,,A faulty resistive voltage dropping ignition switch (again check coil voltage)
While sure coils can go bad, I suspect the points or condensor or a wiring or connection or switch problem FIRST. After that bad plug wires or a dist cap or rotor problem.
Run my Ignition Troubleshooting Procedure may help
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