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JD AR ,
:

or + ground

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Dan

07-01-2001 18:26:51




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I am restoring a '53 AR. I thought it was a positive ground system (like my A), but it seems to be negqative ground. I think the wiring harness instructions are for a positive ground system. How can I tell what it should be. Any help would be appreciated.




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Rob Swartzlander

07-01-2001 18:47:10




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 Re: JD AR , - or + ground in reply to Dan, 07-01-2001 18:26:51  
i am not sure about a AR but my AO is 12 volt with 2 6 volt batt tied together and is neg ground positive to starter



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G Taylor

07-02-2001 14:59:40




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 Re: Re: JD AR , - or + ground in reply to Rob Swartzlander , 07-01-2001 18:47:10  
All Deere's factory equiped with generators on 6V or 12V systems were all positive ground, no exceptions. That's 1920's to late 1960's. 24V systems were isolated from ground except for a tie to chassis at the battery's mid point. Check the coil, some tinker has likely connected the neg to the distributer instead of pos. The wrong polarity will weaken the spark.



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Rob Swartzlander

07-01-2001 18:47:07




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 Re: JD AR , - or + ground in reply to Dan, 07-01-2001 18:26:51  
i am not sure about a AR but my AO is 12 volt with 2 6 volt batt tied together and is neg ground positive to starter



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G Taylor , doesn't make it right

07-03-2001 08:56:04




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 Re: Re: JD AR , - or + ground in reply to Rob Swartzlander , 07-01-2001 18:47:07  
A common occurance by tinkers who arn't sure & swap polarity which leaves latter owners wondering. ALL Deere tractors left the factory as positive ground until the late 60's if 6V or 12V.Generator systems could survive such abuses. Many batterys have been exploded while boosting by persons assuming Deere's were negative ground. Which way does the ammeter read while charging?



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