Technically speaking a 'coil' is not a voltage device but a CURRENT device. Any resistance applied within the circuit is 'current limiting.' These 6v-12v conversions take several forms but the conventional form is to reuse the original coil and insert a ‘current limiting resistor’ so as not to overheat the winding in the coil. In some cases the coil is replaced with a ‘12v coil.’ I really don’t know how the construction of the 12v differs from a 6v. Some say a resistor is added some say more windings are added. The point is that design says X# of amperes in the circuit and if you are replacing the old coil with a new one of, probably, twice the resistance sufficient current will not be developed to make an adequate spark. Verify you have a power resistor in the circuit and remove it and use the new coil or go back to the old coil. Prove the old coil by running the tractor. If it is in fact it’s failing when hot toss it and replace. If not, you saved the price of a coil. Two things I’ll mention: (BTDT) If you are going to rebuild a circuit replace one part at a time with a like part including the wire. If you’re trouble shooting, change out one part at a time. If you wholesale throw parts you will never know what solved the problem. Good luck and have fun.
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