6 or 12 volt

[Habusailor]

I know I have seen the answer to this many times in the Ford barn, but what year did Ford go to 12volt neg earth?


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[dmsfrr]

- 1956 -

[Habusailor]

Thanks, I thought it was in the mid 50s somewhere but couldn’t remember the exact year


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[dmsfrr]

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Habusailor,
Depending on what you're working on this added info may be helpful...

Most electrical parts were changed from 6v '+' ground to 12v '-' ground for '56.
There was another change to the Dash Gauge circuit from '56 to '57.
'56 gauges were built for a full 12 volts, '57+ gauges use 12v power, but there is a voltage reducer/regulator in-line before the gauges. (two example photos below)
.