Negative Ground

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02-08-2018, 11:41 PM

Boomer51

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Negative Ground

Wondering when Ford went to Negative Ground on the F1. I have a '51, it's negative, but my shop manual shows the ground as positive.

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02-08-2018, 11:48 PM

EffieTrucker

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Ford trucks were positive ground until 1956. 1956 was also the year they went to a 12 volt system.

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02-08-2018, 11:56 PM

Boomer51

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Appreciate it. That explains the shop manual. My rig is converted to 12-volt, negative ground.

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06-10-2018, 05:43 PM

Jkabel

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Good evening from Alabama,
Ii have a 1990 F150 with 92k on it. Several things are giving the sign of a bad ground. My door dinger is real phant, if I roll both widows up at the same time the engine shuts off. And finally if I run the fan motor on the truck for the AC/defrost the truck cuts in and out. Besides that she runs amazing.

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