Posted by John T on October 21, 2018 at 08:38:40 from (174.255.15.115):
In Reply to: good then weak spark posted by pinball on October 21, 2018 at 08:17:53:
On a 12 volt tractor IF you have a full true 12 volt rated coil you DO NOT also use an external ballast resistor or else the spark will be weak.
NOTE a coil labeled "12 Volts for use with external ballast" is in reality more like a 6 volt coil and DOES NEED the external ballast (just like it says) or the points will burn quick and the coil overheat HOWEVER a full true 12 volt rated coil that may be labeled "12 Volts" or "12 volts no ballast required" etc is what should be used on a 12 volt tractor.
NOTE a 6 volt coil has somewhere around 1.2 to 2 ohms LV primary winding resistance as measured between its small + and - terminals while a 12 volt coil has more like 2.5 to 3.5
IF ITS A 12 VOLT TRACTOR WITH A FULL TRUE 12 VOLT COIL TOSS THE BALLAST !!!!
NOTE some tractors in lieu of a traditional external bathtub porcelain/ceramic looking ballast used a thermistor wire ballast device which resistance changed once warmed up. If you have that instead of a regular ballast you may have a 6 volt coil. If you have a temperature compensating thermistor type of ballast it may be faulty.
NOTE if its NEG Ground the coils - output goes to distributor and + gets power from the ignition switch perhaps via a series ballast. If its POS Ground reverse that.
I have seen even brand new condensors go bad when once warmed up they fail or grow weak and lower the spark energy IF YOU HAVE THE RIGHT COIL/BALLAST TRY A DIFFERENT OR THE OLD CONDENSOR
I have seen coils go bad and fail ONLY AFTER warmed up !!!
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