Posted by John T on May 30, 2015 at 03:46:25 from (216.249.74.3):
In Reply to: Coil questions posted by Freewheelin' on May 29, 2015 at 18:48:51:
Lets take your questions one at a time:
"Bought a new 6 volt coil @ Fleet Farm that has "Do not use with external resister" marked on it."
That's exactly what Id expect if you bought a 6 volt coil for use on a 6 volt tractor. You would NOT want an external resistor in that case which (on a 6 volt tractor) could reduce the coils input voltage down to 3 or so volts!!!
HOWEVER if you use a 6 volt coil on a 12 volt tractor YOU MUST HAVE an external series voltage dropping (12 to 6) ballast resistor, otherwise the coil will overheat badly. Its designed to operate at 6 volts input NOT 12. But as above if used on a 6 volt tractor then you DO NOT use an external resistor WELL DUH
"Tractor wouldn"t start on it so I assume that although a resister is required to drop the 12 volts to 6, it does not allow the use of this coil."
I RESPECTFULLY DISAGREE
Many many 12 volt tractors use a 6 volt coil PLUS an external series voltage dropping (12 to 6) ballast resistor. If you now have a 12 volt tractor you can use EITHER a) A full true 12 volt coil (NO ballast required) or b) A 6 volt coil plus a 12 to 6 voltage reducing ballast resistor so the coil only sees the 6 volts it was designed for.
ARE YOU SURE THAT NEW COIL IS A 6 VOLT COIL???? IF ITS A 12 VOLT TRACTOR, WHY NOT USE A FULL TRUE 12 VOLT COIL SO YOU DONT NEED A BALLAST??
If you click the URL link below it will give you a step by step troubleshooting procedure to test the ignition and coil and determine the cause of non firing.
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