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Farmall & IHC Tractors Discussion Forum
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Why oh why are some tractors positive ground?

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goterdone

10-30-2005 14:03:36




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I dont understand why some of the older tractors are positive ground. and can they be changed?




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gene bender

10-30-2005 17:36:34




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 Re: Why oh why are some tractors positive ground? in reply to goterdone, 10-30-2005 14:03:36  
RCA and GE teachers in FT MONMOUTH proved to us in class that is the way electron flow works best in a DC circut. U.S. MILITARY used it for years and so did others.Your regulator will say which ground it is made for. Dont worry why just follow what system was designed for. Biggest asked prob;em on this forum seems to be 6-12v and use of alts and generators.



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John T

10-30-2005 15:57:02




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 Re: Why oh why are some tractors positive ground? in reply to goterdone, 10-30-2005 14:03:36  
Before things became standard they went both ways, I believe Ford n Chrysler went with Pos while GM went Negative. Things I have read indicated they thought Pos produced less galvanic action and corrossion where frame members met plus the points pitted less and theres the thing about on spark plugs how its easier to emit electrons from a relative hotter (electrode) to a relatively colder (ground strap). The genny will work either way if polarized while there can be an issue on the VR if its not suitable for either ground.

They just hadnt decided on any standard yet is why one sees pos and neg in the early days.

John T

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old

10-30-2005 15:13:32




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 Re: Why oh why are some tractors positive ground? in reply to goterdone, 10-30-2005 14:03:36  
It was just the way it was done yours ago. It was belived that it made a differance on how things worked back then and since found it its no big deal to hook it the other way. Theres a more tecknical answer for it but, it would take a long post to explan. You can change it easy just be sure to polarize the genny if you do. If it has a genny that is if it has an alternator it almost has to be neg. ground.

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big fred

10-30-2005 14:06:33




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 Re: Why oh why are some tractors positive ground? in reply to goterdone, 10-30-2005 14:03:36  
Yes, but it can take years of therapy.

Seriously, before the mid-50's or so, most every vehicle was positive ground.



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goterdone

10-31-2005 04:56:11




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 Re: Why oh why are some tractors positive ground? in reply to big fred, 10-30-2005 14:06:33  
Thanks. I am amazed at the combined knowlege that is available on this site. I think Ill just leave well enough alone. Thanks again!



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