AFIK, on 6v cars & light/medium trucks, Chev was always neg gnd, GMC & Pontiac were pos gnd, not sure, but think rest of GM line,Buick, Olds, Cad, along with Studebaker, Hudson, Nash etc & complete lines from Ford & Chrysler were pos gnd. When GM changed to 12v in 55, they made everything neg gnd, Ford & Chrysler did the same in 56, IHC trucks went 12v pos gnd in 57, neg gnd in 58. Don't know about the others, but Henry Ford went pos gnd because his buddy Edison said to, claimed it helped prevent corrosion of steel frames. With the invention of the transistor in 47 things start moving quickly. Early diodes required that the metal case had to be on the neg side, so that was connected to chassis. Other choice would be to use 2 wire isolated circuits instead of using the chassis for one side. Most builders went neg gnd with 12v to be ready when transistor radios & diode controlled alternators that were in developement hit production. Kind of O T, Edison invented a lot of stuff, but was working with D C current for powering buildings for lites etc. His system powered lower Manhatten, but could only push current about a mile, too much loss from conductor resistance. D C current will not go through a transformer to increase voltage for long transmission lines, then back down for consumer use. His rival, Tesla, was working with A C. His first system from Niagara Falls to Buffalo used A C, transformers kicked up to high voltage for less resistance & line loss, than back down for consumer use. Proved A C current could be sent over long distances. Longer than I wanted to get,& more info than you wanted. Willie
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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