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Thread: Tow bar wiring diagram for Discovery 3 SE 2007

  1. 13th June 2018, 05:17 AM #1
    BarryCronin
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    Tow bar wiring diagram for Discovery 3 SE 2007

    Hi All.
    Being the proud new owner of a lovely shiny 2007 Java black Discovery 3 SE, I would like to use it to pull our caravan, however I am having a little trouble working out what goes where in the two sockets 7N large & 7S large either side of the hitch receiver when i put a meter on the pins, it shows varying results??
    I heard that you need a load connected before you can use a meter to test which pin is what??
    Does anyone have a link to the "correct" wiring of the two sockets so that I can change the 12 pin and the two Andersons on my caravan draw bar to suit these two plugs please.
    I have looked everywhere on google but keep coming up with different set ups (not sure if its year specific or not)
    Any help would be appreciated please as I cannot wait to take it on a trip.
    Thanks in advance everyone.
    Barry
    Last edited by BarryCronin; 13th June 2018 at 05:30 AM. Reason: Incorrect info
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  2. 13th June 2018, 05:35 AM #2
    harryharrison
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    The wiring is pretty standard for that type of plug. It's just those plugs are rarely found down under (they are the only type found in the UK)

    Towbar Wiring Guides : Electrical Wiring Guide for Towbars : Watling Engineers UK
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  3. 13th June 2018, 05:44 AM #3
    Tombie Guest
    Here you go.. (note that the drawing shows the plugs rotated 90 degrees.

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  4. 13th June 2018, 06:39 AM #4
    BarryCronin
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    Hi Harry
    Thanks for the speedy response. I have electric brakes on my caravan but no fog lights, could I simply cut the fog lamp wire off the rear of the socket on the Discovery 3 and use that pin for the electric brake feed or would this cause some trouble??
    Cheers for your help.
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  5. 13th June 2018, 08:10 AM #5
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    LRD414
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    Barry, have a good read of this thread in the Sticky Thread section > D3 Electric Trailer brake wired-photo
    You should find everything you need to know for lights and electric brakes.

    This one is useful too > Discovery 3 LED trailer lights

    Regards,
    Scott
    D4 TDV6 MY14 with Llams, Tuffant Wheels, Traxide DBS, APT sliders & protection plates, Prospeed Winch Mount w/ Carbon 12K, Mitch Hitch & Drifta Drawers
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  6. 13th June 2018, 09:42 AM #6
    BarryCronin
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    Thanks to all of you for your valuable input on this matter!!!
    I've decided to bit the bullet and pay an auto electrician to do the lot, its too difficult and if I make a mistake I could blow the unit too

    Thanks again

    Barry
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  7. 13th June 2018, 10:17 AM #7
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    LRD414
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    Quote Originally Posted by BarryCronin View Post
    I've decided to bit the bullet and pay an auto electrician to do the lot
    Make sure that he's experienced with the requirements for a D3, particularly related to the electric brake controller wiring.
    Or at least provide a copy of the relevant details from the thread I linked earlier.
    There are a couple of critical details that are not obvious to the uninitiated.

    Cheers,
    Scott
    D4 TDV6 MY14 with Llams, Tuffant Wheels, Traxide DBS, APT sliders & protection plates, Prospeed Winch Mount w/ Carbon 12K, Mitch Hitch & Drifta Drawers
    Link to my D4 Build Thread
    D3 2005 V8 Petrol
    Ex '77 RRC 2 door. Long gone but not forgotten.
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