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  1. #1
    New Member
    Join Date
    Jan 2012
    Posts
    3
    Tractor
    john deere 730lp

    Default jd 620

    Just purchased a jd 620 missing generator, pre owner had started to install a alternator. looking for wiring diagram on how to wire alt for negative ground tractor.

  2. #2
    New Member
    Join Date
    Jul 2013
    Posts
    9
    Location
    durango iowa
    Tractor
    jd 6410

    Default Re: jd 620

    Not sure about 620 but 630s are positive ground.

  3. #3
    Elite Member
    Join Date
    Sep 2010
    Posts
    4,088
    Location
    Canada
    Tractor
    MF

    Default Re: jd 620

    The 620's were originally 6 volt positive ground.

    Don't know if this will help but its all I got.

    Attachment 327832

  4. #4
    Bronze Member
    Join Date
    Jul 2008
    Posts
    71
    Location
    Wisconsin
    Tractor
    JD M, JD B, JD A, JD 50, JD 60, JD 420 JD 530, JD 630, JD 1010, JD 1010 Crawler,JD 3020G, JD 3020D, JD 2520 Compact Utility, JD 4720 Compact Utility

    Default

    These tractors were 12 volt positive ground. They originally used two 6 volt batteries wired in series, instead of one 12 volt battery. Why not just put a generator back on it? Makes it look better and the technology is sound as there are plenty of them out there still with generators today.

    What are your plans for the tractor?

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