They WERE NOT USED on six volt systems , I H never changed coils when they went to twelve volt they added the resistor into the systems . when they went to the twleve they put the resistors next to the coild and like said above the BLACK wire hooks to it and there is a WHITE wire coming from the R post on the starter tha bypasses the resistor to give the coil a shot of straight 12 for a hot start when you press the starter button . Once you let off the starter button all the juice then goes thru the resistor and the 12 volt feed is cut down to 6-8 volts to the coil. to save the coil and the points. You can use either a GM resistor or one off a Mopar that has the two terminals They did not go to this till the 460-560 .
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