SOURCE: 1951 plymouth cranbrook 12 volt system conversion
Purchase a one wire (12 volt) alternator,and install it,and it uses one wire only,the out put wire to the battery from the back of the alternator.Then replace all lamps,and bulbs with 12 volt replacements.Disconnect the voltage regulator completely.The radio,if original,will need a voltage reducer,purchase a coil resister to put in line on the positive input to the radio.This coil resister will reduce the voltage to 7 volts,witch will be fine.The starter will work fine,leave it alone.All dash lights will have to be changed also,to 12 volt bulbs.You can find these replacement parts at any N A P A auto parts store.The resister is a part number irc 13,and the alternator will end in a sw,this means single wire.
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SOURCE: Does a 1951 Plymouth Cranbrook have a primary resistor that has to do with starting the car?
Older cars had a ballast resistor to limit the voltage to the ignition coil in order to prolong the life of the coil. The way it was set up, when the starter was engaged, the ballast resistor was bypassed, providing full voltage to the coil for a 'hot' spark. Once the engine was running, current to the coil was routed through the ballast resistor. I think this was usually accomplished in the ignition switch - full power in 'Start' position, through the ballast resistor in the 'Run' position.
SOURCE: The original diagram ignition switch on a 1951 Plymouth cranbrook.
try this link you might find it... diagram ignition switch on 1951 Plymouth cranbrook Google Search
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