Well i am sorta in the dark here , What tractor are you working on for one and for two is it a six volt now or is it a 12 volt . ?????? IF it is still 6 volt then no resistor is needed with a six volt coil. IF it WAS a six volt system and has been changed to twelve then if your running a stock coil from the six volt system then it needs a resistor . If you have replaced the six volt coil with a twelve volt coil it should say on the side of the coil if it DOES NEED a resistor or not . A couple years ago i broke down and switched my S/MTA over to 12 volt and all i added was the resistor . It is installed behind the STOCK coil that the S/MTA came with , and all i had to do was take the ing. wire off the coil and hook it to the resistor and make up a short jumper wire to go from the resistor to the coil.
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