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1948 - 1956 F1, F100 & Larger F-Series Trucks Discuss the Fat Fendered and Classic Ford Trucks

Negative Ground

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Old Feb 8, 2018 | 11:41 PM
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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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Old Feb 8, 2018 | 11:48 PM
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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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Old Feb 8, 2018 | 11:56 PM
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Appreciate it. That explains the shop manual. My rig is converted to 12-volt, negative ground.
 
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Old Jun 10, 2018 | 05:43 PM
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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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Old Jun 10, 2018 | 06:27 PM
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Originally Posted by Jkabel
Good evening from Alabama, I have a 1990 F150 with 92k on it.
You are asking this question in the wrong forum, this is the 1948/56 forum. You want the 1987/96 F150 and larger F series truck forum.
 
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