Posted by paul on May 05, 2008 at 19:59:43 from (66.44.132.218):
In Reply to: battery question posted by farm M on May 05, 2008 at 19:51:31:
Pretty much all old vehicles - cars & trucks too - were 6v positive ground.
When diesel engines came out, not enough cranking power (and brighter lights, and....), so they switched to 12v. They also learned more about electricity, & realized negative ground was a better way to go.
It's probably more complicated than that, but pretty close to how it went.
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