You can get one from your local auto parts store like NAPA. On a 12 volt system you only need around 8 volts going to a distributor with points. Mine is a 12 volt system i found a resistor with a Ohm value of 1.82 and it took the 12 volts down to a tad over 9 volts to the distributor which is ok.(higher the Ohm value the more it will drop the voltage) The resistor will go inline to the wire that is connected to the plus side of the coil. Food for thought if you convert the distibutor to HEI (electronic pick-up means no points) you want need a resistor because the electronic pick-up can take the 12 volts. Hope this helped
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