When did Ford go to 12 VOLTS

FWIW, I had a '56 that was 6 volt, special order .Connecticut state plain jane 2 door Mainline, this allowed them to use a "hand-me-down" 6 volt 2-way radio. Never did know who used the car.
 
Does anyone know why they made the change from positive ground to negative ground on their vehicles?
 
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