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Thread: D3 Electric Trailer brake wired-photo

  1. #101
    Join Date
    Oct 2010
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    Caloundra
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    Ok, so that seemed to work. Still not sure why there is no cable to pin 5 in the 12S socket.

    Haven't actually taken the caravan for a run yet, but the controller is showing all the right signs.

    The word 'catch' in the descriptor for pin 1 - I think this is for an electronic catch for a manual override trailer brake. normally there is a small catch, or physical switch, that stops the brakes from working when you reverse. I have seen some setups where this is an electronic switch that can be set from the driver's seat. So I think I'm safe to use this cable. Must mean that somewhere up from there is already a cable that connects to Pin 1 in 12S, which would save running a cable back in the first place.

    Hope this helps someone!

  2. #102
    Join Date
    Dec 2014
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    Branxton, NSW, Australia
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    Wiring in a controller

    Hi All, Is there a reason a controller can't just be wired in like on a 'normal' car without the need for the diode and cutting into the rear harness and all that?? Seems complicated. I've already run a heavy feed wire from the battery to under the dash to feed the controller, then a heavy service brake wire to the rear of the car to supply the brakes. While I was in the fuse box under the glovebox I put a piggyback fuse in the brake light wire circuit so that should be the signal for the controller to activate. So, why can't I just run the service brake wire into the loom down near the plug or into my 12N to 7 Flat adapter or something, or even splice it into the service brake wire in the rear fuse compartment? I'm probably oversimplifying it though, just seems all a bit complicated... still have to get my noggin around it.
    Is where I've taken the brake light feed from theoretically OK?
    Current - Silver 2007 SE D3
    2005 Defender 110 Wagon TD5 - Gone :(

  3. #103
    Join Date
    Mar 2011
    Location
    Balbarrup WA
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    Electric trailer brake controllers

    Have found that there is a difference in how the electric brake controllers have to be wired depending on whether you have "electric' brakes, or "electric over hydraulic" brakes on what you are towing.
    It seems that the latter requires a constant feed to one of the wires (to keep trailer brake battery on charge), and that may be lead 2 or lead 5.
    As my electric over hydraulic trailer is sometimes loaned to those with controllers set up for "electric" (only) brakes, I had the auto sparky wire me up a connector plug where he had bridged the reverse wire to supply constant power.
    BUT. When reversing the trailer they have to remember to unplug the connector as the brakes come on when they select reverse and cannot reverse trailer.

  4. #104
    Join Date
    Apr 2020
    Location
    Sunshine coast
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    Electric brake fuse slot

    Ive read through the posts and its all very informative but my question is, on my d3 2006 it has a slot in the fuse box for electric brakes and either side of the rear recovery eye above the tow bar it has a large round white plug socket and alarge black socket, there is no brake controller mounted to the dash under the steering wheel anywhere, does the vehicle come with a inbuilt brake controller? Or is the fuse there just as a point to draw power to a brake controller which previous owner may have removed? I have a teckonsha p3 to fit to the vehicle but not sure that i need to, if its built in to the car somewhere would save me the headache! Did LR option the car with a factory controller under bonnet or somewhere else in the car other than dash mounted?

  5. #105
    Join Date
    Nov 2014
    Location
    Mackay, Qld.
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    Quote Originally Posted by Poolguymark View Post
    Ive read through the posts and its all very informative but my question is, on my d3 2006 it has a slot in the fuse box for electric brakes and either side of the rear recovery eye above the tow bar it has a large round white plug socket and alarge black socket, there is no brake controller mounted to the dash under the steering wheel anywhere, does the vehicle come with a inbuilt brake controller? Or is the fuse there just as a point to draw power to a brake controller which previous owner may have removed? I have a teckonsha p3 to fit to the vehicle but not sure that i need to, if its built in to the car somewhere would save me the headache! Did LR option the car with a factory controller under bonnet or somewhere else in the car other than dash mounted?
    As far as i know Disco 3 didn't come with factory brake controllers. White is 12S not generally used in OZ for towing purposes but does have constant 12v feed from battery so you can charge the battery through it as I do. Black is 12N which you use to run your trailer lights / brakes etc. See below diagram. So yes you will have to fit your P3 brake controller as per instructions in the thread. Hope this helps.
    Cheers Peter


  6. #106
    Join Date
    Jan 1970
    Location
    St Helena,Melbourne
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    I don't think any vehicle comes with a trailer brake controller from the factory.
    MY08 TDV6 SE D3- permagrin ooh yeah
    2004 Jayco Freedom tin tent
    1998 Triumph Daytona T595
    1974 VW Kombi bus
    1958 Holden FC special sedan

  7. #107
    Join Date
    Jul 2019
    Location
    buderim
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    total annhilation

    my neighbour has a new d5, he had the trailer brakes pack wired by an auto elect., coming down Buderim WITH NO TRAILER THE VEHICLE STOPPED, ENGINE WAS DESTROYED
    a new one was put in 33000 dollars, only some intervention by the LR dealer,to the insurance Company of the sparky saw a claim succeed
    now, my neighbour has that sorta money rolling around in his glove box, but he was distraught. said he'd never have any work done is it couldn't be done at the dealer, from now on

  8. #108
    Join Date
    Jan 1970
    Location
    St Helena,Melbourne
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    I will be fitting a tow pro elite to me D3, is this diode suitable ?

    1N5408 3A 1000V Diode | Jaycar Electronics
    MY08 TDV6 SE D3- permagrin ooh yeah
    2004 Jayco Freedom tin tent
    1998 Triumph Daytona T595
    1974 VW Kombi bus
    1958 Holden FC special sedan

  9. #109
    Join Date
    May 2022
    Location
    Melbourne
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    Does anyone have a high res version of the photo from the original post?

  10. #110
    Join Date
    Jan 1970
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    St Helena,Melbourne
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    Quote Originally Posted by fudge View Post
    Does anyone have a high res version of the photo from the original post?
    You don't really need one, only 2 wires to connect in the rear if you run the positive and negative to the battery.
    Just follow the guide as to which colours go where.
    MY08 TDV6 SE D3- permagrin ooh yeah
    2004 Jayco Freedom tin tent
    1998 Triumph Daytona T595
    1974 VW Kombi bus
    1958 Holden FC special sedan

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