Posted by willie in mn on September 04, 2014 at 00:28:53 from (64.12.116.16):
In Reply to: Positive ground posted by 37Chief on September 03, 2014 at 21:15:04:
IIRC, Chevy 6 volt was always neg gnd. At least from 36 on. Not sure when, but some GM brands changed to neg gnd & 12 volt before 55. Everybody else used pos gnd. Volkswagen was still 6 volt, pos gnd in 61, not sure when they changed. Henry Ford & Thomas Edison were close friends & shared ideas. They thought, right or wrong, that pos gnd caused less body/frame corrosion. The Dodge brothers had worked for Ford, so when they started on their own they kept that system. When they joined with Walter Chrysler, they continued pos gnd. In the early 50's transister radios were being developed, & by nature of the beast they had to be neg gnd. They can be built with internal connections for the second side of the circuit, but then must have insulated chassis/case. By coincidence engineers were developing 12 volt useage at the same time, so they made the switch to accept the new fangled components. GM switched their remainingt 6 volt to 12 volt in 55, keeping neg gnd. Ford, Chrysler, & some others made the switch to 12 volt, neg gnd in 56. IHC trucks switched to 12 volt in 57, keeping pos gnd, (learned that one the hard way) then neg gnd in 58. Most farm tractors kept pos gnd until changing from generators to alternators, which were more economical to build with neg gnd. More than you wanted to know. Edison pushed use of DC current for the grid to serve power to buildings, even building a system in New York City. Worked great up to 2 or 3 miles from the generator station, but due to line loss, not useful over longer distance. The last I heard, there are still a few buildings in lower Manhatten using the Edison DC power generators. At the same time, Tesla was developing AC current.His system at Buffalo could transmit power much longer distances, with minimum line loss, & became the standard useage. Willie
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