Thread: swapping 6volt for 12

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If he is planning to use 50 year old wire, talk him into using an aftermarket harness. Solves practically all the 6v vs 12v problems. Instructions come with the harnesses. The only thing that he probably should not wire in is the amp gauge - use an aftermarket voltmeter instead. Regarding the polarity problem, you can run a 12 positive ground system, but its easier to go negative ground. None of the gauges,the starter, the switches (ignition, lights, etc) are polarity sensitive. The radio may be. All the switches can run on 12 volt if in reasonably good condition. You will need a voltage reducer for the heater blower motor, as well as the gauges (not the amp gauge-see above). For the gauges, get either runtz reducers or the Ford gauge voltage reducer used on all Ford from 57 to the 80's. Available at auto parts stores, maybe even a Ford dealer. The six volt starter will run okay on 12 volts. For the radio get an inverter. Change all bulbs to 12 volt equivalent. The wires on the coil need to be switched and a resistor must be used for the coil. The generator can be rewired for 12v by anyone who rebuilds starters.

The only problem is the push button starter - not sure how that can be wired with a aftermarket harness.

The switch is only a little more complicated if he is using the stock wiring - but not impossible. If the factory wires are in good condition they will handle 12 volts with no problems.

Originally Posted by Charlyg

Hi All - A friend wants to convert his '50 Ford Woodie from 6 volt system to 12 volts. Is there a website that delves into this or does anyone know of a magazine,book, or series of articles that covers this transformation. He wants to keep the Flathead . Many thanks in advance, Charlyg