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Why positive ground?????????

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John Henry

10-06-2001 08:38:04




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The shop rebuilding my generator said they could change my polarity to negative ground if I wanted.
Is there any advantage to swapping my 530 from positive ground to negative ground?
What year did Deere switch to negative ground?




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MIKE HANLEY

10-09-2001 03:40:52




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 Re: Why positive ground????????? in reply to John Henry, 10-06-2001 08:38:04  
ALSO IF YOU GO TO NEG GROUNG YOU HAVE TO SWITCH THE WIRES ON THE COIL SO THE + GOES THE THE DASH AND THE - GOES TO THE DIST' OR YOU WILL BURN POINTS. ALSO YOUR GAS GAGE MAY NOT WORK. I HAVE A 630 WITH A ALT NEG GROUND BUT I DO NOT REMEMBER IF I CHANGED THE GAGE AND SENDER. I CONVERTED TWO 730D FROM 24 VOLT TO 12 VOLT NEG GROUND. BESIDES BEBUILDING THE STARTER I HAD TO GO TO A UNIVARSAL 12 VOLT NEG GROUND GAS GAGES AND SENDER EVEN THOUGH THE FACTORY GAGE AND SENDER ON A 24V 730D IS 12 VOLT AND WIRED THE SAME AS THE 12 VOLT LIGHTS. IF YOU STAY WITH AND GEN I WOULD LEAVE IT FACTORY AND IT WOULD BE WORTH MORE AND IF YOU EVER SELL IT,IT WOULD SAVE THE NEW OWNER HEADACKS.

I HAVE A 1946 JEEP AND HAVE THE SHOP MANUAL AND IT WAS FACTORY NEG GROUND. I HAVE A 12VOLT ALTANATOR ON IT WITH 12 VOLT LIGHTS BUT THE STARTER IS STILL FACTORY 6VOLT AND EVERYTHING ELSE IS 6VOLT WITH RESISTERS CUTING 12 VOLTS TO 6 VOLTS. THE ONLY REASON I DID THIS WAS 12VOLT LIGHTS CAN BE HAD ANYWHERE. EVEN WAL MART.

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kindly request

10-10-2001 12:25:09




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 Re: Re: Why positive ground????????? in reply to MIKE HANLEY, 10-09-2001 03:40:52  
Could you please check if your "Caps Lock" is on and if so please take it off. I believe the consensus is that it is easier to read small letters. Thanks



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MIKE HANLEY

10-10-2001 16:31:35




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 Re: Re: Re: Why positive ground????????? in reply to kindly request, 10-10-2001 12:25:09  
CATATRCTS. DO NOT HAVE 20 20 VISION. SORRY MY DISABILITY OFFENDES YOU



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You caused no offense!

10-12-2001 09:23:46




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 Re: Re: Re: Re: Why positive ground????????? in reply to MIKE HANLEY, 10-10-2001 16:31:35  
We should possibly all use CAPS to ease the situation for those who have some vision problems.
What do you think about that?



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JAson

10-06-2001 18:15:40




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 Re: Why positive ground????????? in reply to John Henry, 10-06-2001 08:38:04  
As long as everything worked good the way it was, I would leave it alone. If you decide to change the polarity, make sure the polarity of the voltage regulator can be changed. Some of them will only allow one, but not the other.



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Mikey

10-06-2001 17:38:38




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 Re: Why positive ground????????? in reply to John Henry, 10-06-2001 08:38:04  
A Deere engineer told me at a school I attended in Columbus that the company favored positive ground for several reasons, but mainly because of the earth current. All John Deere machines built from 1969 and back were factory equipped positive ground.



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John T

10-06-2001 13:56:18




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 Re: Why positive ground????????? in reply to John Henry, 10-06-2001 08:38:04  
John, some theories claim theres less galvanic corrosion in the frames using positive ground and some say less corrosion and pitting on the points, and Ford used it also. JD stayed pos grnd until they went from generators to alternators I believe. Ol John T Engineer in Indiana



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WTW

10-08-2001 07:10:37




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 Re: Re: Why positive ground????????? in reply to John T, 10-06-2001 13:56:18  
John, Your statement answering the question, When did Deere go from Positive to Negative ground? is the only correct one. The (John Deere) rule of thumb on this concerning Positive / Negative ground is: If it has a generator it is positive ground. If it has an alternator it is Negative ground. Some John Deere tractors had alternators on them in the mid 60's Examples: 2510, The 24 volt 5020 and 4020's with factory air conditioning had a 24 volt two wire alternators and another was the 2020 with a 12 volt alternator. After 1969 then about every John Deere tractor had alternators. There was a few exceptions. Just thought I would put my two cents in. Dave W.

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Clooney

10-06-2001 09:07:29




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 Re: Why positive ground????????? in reply to John Henry, 10-06-2001 08:38:04  
John, John Deere isn't the only company or tractor to use positive ground. There was a theory in the past that positive ground eliminated (or at least slowed down) corrosion & battery drain due to dampness in the air. I work for one of the auto companies & don't think we ever proved one way or the other the ground actually made a difference. There isn't any reason to change your tractor to negative ground unless you want to run a radio, or other negative ground equipment. I believe J.D. switched to negative ground at the end of the 2 cylinder era (about 1961 or so).

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mike

10-06-2001 16:34:34




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 Re: Re: Why positive ground????????? in reply to Clooney, 10-06-2001 09:07:29  
I've got a 1967 3020 gas that still has positive
ground.The JD radio on the fender has a switch
for pos or neg ground.



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Bob

10-06-2001 11:02:57




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 Re: Re: Why positive ground????????? in reply to Clooney, 10-06-2001 09:07:29  
I think if you switch to negative ground you will have to switch the leads on the ammeter. I'm sure if I am wrong someone will correct me hopefully.



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