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  1. #1

    Default Battery hooked up backwards,OOP!

    What did I fry by hooking up my new battery backwards on my John Deere 850? Yes, I am an idiot!

  2. #2
    Platinum Member
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    Dec 2008
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    Buffalo, New York
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    318 John Deere, 4200 John Deere, 1947 John Deere "M"

    Default Re: Battery hooked up backwards,OOP!

    Don't beat yourself up so quickly, "idiot" !. What happened when you put it back in correctly?

  3. #3
    Super Member
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    Apr 2004
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    6,378
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    SF Bay Area-Ca Olympia WA Salzburg Austria
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    Cat D3, Deere 110 TLB, Kubota BX23 and L3800 Craftsman Mower

    Default Re: Battery hooked up backwards,OOP!

    Speaking from the collector car world... you shouldn't have a problem unless you have an alternator and/or electronics.

    Happens a lot on cars with generators and the worst thing is the battery meter reads charge when it's discharging and vice versa...

    Does it start normally and charge ok?

  4. #4

    Default Re: Battery hooked up backwards,OOP!

    Nothing! No lights no nothing. It also smoked when I first hooked it up backwards. I changed all the fuses.

  5. #5
    Epic Contributor Bird's Avatar
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    Mar 2000
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    37,359
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    Texas

    Default Re: Battery hooked up backwards,OOP!

    I did that to the mayor's Plymouth when I was 17. That was when I learned that some cars had a positive ground. I'm not sure just how far he drove it, but it didn't hurt the car; just ruined the new battery.
    Bird

  6. #6
    Super Member
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    SF Bay Area-Ca Olympia WA Salzburg Austria
    Tractor
    Cat D3, Deere 110 TLB, Kubota BX23 and L3800 Craftsman Mower

    Default Re: Battery hooked up backwards,OOP!

    Some vehicles have fusible links to protect wiring...

    Looks like you will need to start tracing the wires back from the battery, checking for power as you go...

    Wish I could give you specifics on Deere.

  7. #7
    Gold Member
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    Nov 2005
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    463
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    Colebrook, N.H.
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    Kubota L3830HST

    Default Re: Battery hooked up backwards,OOP!

    If your local dealer has a good service department, a call to them might yeild some good suggestions.
    -Jim

  8. #8
    Advertiser kennyd's Avatar
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    Jul 2003
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    Westminster, MD
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    John Deere 4110, 455

    Default Re: Battery hooked up backwards,OOP!

    Have you checked or replaced the battery? It was probably damaged.
    KennyD
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  9. #9
    Platinum Member
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    kenstrac's Avatar
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    Jan 2009
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    So central NH.
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    Kioti DK 45

    Default Re: Battery hooked up backwards,OOP!

    I have 3 prints for 850 none of them have a fusible link what I think happened is you blew the voltage reg or alt taking the switch with it press the temperature test switch and if you have a light then the power is getting to the switch if not the wire is burnt from starter.Find a white wire w/black tracer at the fuse block and see if you have 12V make sure key is on and light sw is on if you don't have power either the Ing switch is blown or the wire is bad if you find the problem do not leave the alt or voltage regulator in the circuit or you will be going through this again. I hope the starter did not run reverse polarity because it is a PM starter and will turn backwards.
    Last edited by kenstrac; 12-12-2009 at 02:40 PM.

  10. #10
    Silver Member
    Join Date
    Oct 2005
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    189
    Location
    missouri ozarks
    Tractor
    Yanmar F16D

    Default Re: Battery hooked up backwards,OOP!

    Don't feel alone. I did that to my 300zx, once. Won't do it again. Fried it's little brain. $800 repair. Not sure what it will do to a tractor, not as many electronics to mess up.

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