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| | Forums66 Topics128,052 Posts1,055,741 Members48,426 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
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on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
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| | | Joined: Oct 2006 Posts: 4,983 Master Gabster | | Master Gabster Joined: Oct 2006 Posts: 4,983 | 55 Fords used a 6V positive ground system. In 56, Ford switched to 12V positive ground, along with Packard, Nash, and a couple of other auto manufacturers and then all the auto manufacturers changed to 12V Negative ground in 1957. This was done to standardize the electrical systems so aftermarket accessory manufacturers could simplify their inventories, among other reasons. Freightliner and a few of the other big truck manufacturers used 12V positive ground until the mid-1960's. The 64 Freightliner I learned to drive after getting out of the Air Force used a 12V + system.
Jerry I always thought those 2.5 ton trucks carried 24 volt batteries. (2)
~Jim
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