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  1. #1
    New Member
    Join Date
    Sep 2011
    Posts
    8
    Location
    Missouri
    Tractor
    kubota b1700HST

    Default JD 6400 electrical problem. please help.

    Greetings
    My 6400 is acting weird electrically. I was having problems starting it; and now experiencing electrical problems.
    my rear lift arms wont move, no A/C blower, no instrument readings, unless you pull fuse. crazy stuff... ANY IDEAS?

  2. #2
    Elite Member Zebrafive's Avatar
    Join Date
    Aug 2010
    Posts
    3,068
    Location
    South West MI
    Tractor
    John Deere 2030, John Deere 6415

    Default Re: JD 6400 electrical problem. please help.

    Only Idea I have is battery may be low. When the battery is low on my JD 6415 it starts (barely) but one turn signal light will be on and it's indicator in the dash. If I charge the battery the light does not come on.
    John Deere 2030 JD 245SL Loader
    John Deere 6415 mfwd JD 640SL Loader

  3. #3
    Platinum Member
    Join Date
    Jun 2009
    Posts
    679
    Location
    wyoming

    Default Re: JD 6400 electrical problem. please help.

    I would agree with Zebra, low voltage can cause problems. This tractor won't be as particular but newer units if jump started repeatedly have a tendancy to fry electrical components. I would load test battery, if it is good check resistance at cable's etc. Good luck.

  4. #4
    Platinum Member
    Join Date
    Dec 2001
    Posts
    996
    Location
    Maryland

    Default Re: JD 6400 electrical problem. please help.

    Which fuse are you pulling? Do all functions work with fuse removed? There is a rockshaft calibration fuse that is not supposed to have a fuse in it unless you are trying to calibrate or trying to read codes with performance monitor.

  5. #5
    Elite Member Zebrafive's Avatar
    Join Date
    Aug 2010
    Posts
    3,068
    Location
    South West MI
    Tractor
    John Deere 2030, John Deere 6415

    Default Re: JD 6400 electrical problem. please help.

    Another idea, check the relays. You may have a bad one not making good connection internally.
    John Deere 2030 JD 245SL Loader
    John Deere 6415 mfwd JD 640SL Loader

  6. #6
    Member
    Join Date
    Jan 2013
    Posts
    32
    Location
    plainfield ct
    Tractor
    850 jd

    Default Re: JD 6400 electrical problem. please help.

    on the right side of the engine where the fuel filter mounts, the grounds are attached, the bracket breaks at that mounting point and makes a bad ground point

  7. #7
    Platinum Member
    Join Date
    Dec 2001
    Posts
    996
    Location
    Maryland

    Default Re: JD 6400 electrical problem. please help.

    It's OK to move the ground to a more secure location on the engine. I recommend getting a longer ground if needed and attach it to the starter mounting bolt. It is a little tough to reach, but it is the most direct ground for the starter.

  8. #8
    New Member
    Join Date
    Jul 2008
    Posts
    13

    Default Re: JD 6400 electrical problem. please help.

    I had similar problem on my 3320. Found out that the Electronic Module goes nuts if the input voltage drops to less than 11.5V. Couldn't start, instruments flashed, something "BUZZED", OEM battery had one weak cell that did not let voltage rise to required level. Replaced battery (warranty); all's well, has been for over 2 years. I did a Google search, looking for electrical problems; got good results.

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