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
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - Talk of the Town: Trailerin a Tractor, Chains or Straps? - by Staff. Another great discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: " I bought a trailer and plan to take my CASE VAS to some shows. I don't yet have anything to secure it to the trailer. So which is better to buy and use; the ratchet-type straps or binders and binder chains?
... [Read Article]
Latest Ad:
For sale Farmall super A tractor is complete and has just been setting for awhile,it was running when pulled out of the barn,shouldn’t take to much to get it going asking 1100.00
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
