Posted by John T on June 15, 2022 at 18:34:30 from (45.16.200.171):
In Reply to: ign. coil posted by roy prins on June 15, 2022 at 17:10:51:
If its a 12 volt tractor that uses a 6 volt coil ??,, plus a series voltage dropping (12 down to 6) ballast resistor ??,, PLUS the ballast by pass feature while cranking ??,,that can improve cold weather starting I WOULD LEAVE IT (repair as needed) AND NOT USE A 12 VOLT COIL......If it had a 12 volt coil PLUS the series ballast still in place, coil voltage would be low and the spark weak
The ballast by pass function circuit may not be all in place and wired and working correctly thats causing your problem.
If thats what you have ?? and its all in place wired and working correct ?? ONLY WHEN THE STARTER IS ENGAGED there should be unballasted battery voltage on the coil (ballast is by passed jumped around with battery voltage direct to coil) and then when in the normal RUN power goes to and through the ballast and then to the coil so you have 6 left for the 6 volt coil.
What may be happening if the by pass circuit isnt working is when cranking battery voltage is reduced causing a weak spark but when no longer cranking voltage rises making a stronger spark so she starts
Low voltage when cranking may be caused by too small cables,,,,,,,,weak battery,,,,,,defective starter drawing excess current,,,,,,,,,bad cable or bad ground or battery connections CHECK ALL THAT ESPECIALLY BATTERY CABLES AND GROUNDS
Also check if it has a ballast and its good and continuous with correct resistance (around 1 to 2 ohms or so) and insure its wired right and that when cranking the ballast gets by passed so battery voltage gets to the coil ???????? Check the wiring from an IGN terminal to the coil (NOT from ign switch TO ballast) to insure WHEN CRANKING battery voltage is indeed getting direct to the coil (NOT having to pass through ballast) Check wiring from switch/solenoid up to coil (same location electrically as output side of ballast) thats the ballast by pass while cranking feature
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