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Thread: Discovery 3 LED trailer lights

  1. #11
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    Had the same issue with a LED fitted Trailer. It’s the on board computer pulsing to see if a trailer is present. Unfortunately the LED’s don’t provide sufficient resistance for the computer to acknowledge their presence. Apparently a problem in trucks, motor cycles and many European vehicles.
    Search the web for a device called an LR12 which is a 12V load resistor – I found some at a trailer / caravan specialist (They have the problem all the time) and fitted these in line with a 12V relay for each indicator circuit.
    Cost about $50 for all the gear and an hour in the shed. All fixed. (Maybe not as neat as the manufactured version but works well)

  2. #12
    BennyH Guest
    Colin,
    Thinking of doing the same with my D3. Did this allow the car to recognise the trailer? So far I have tried just the resistors and it does not seem to even allow the car to recognise. Obviously I still have the pulsing, which I imagine the relays will get ride of (getting them in next week!) Wondering why the car will not see them with the resistors though?
    Do you have a quick diagram or method of wiring, or is it is asimple as throwing them in series in the indicator lines on the trailer?

  3. #13
    slug_burner is offline TopicToaster Gold Subscriber
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    Quote Originally Posted by BennyH View Post
    Colin,
    Thinking of doing the same with my D3. Did this allow the car to recognise the trailer? So far I have tried just the resistors and it does not seem to even allow the car to recognise. Obviously I still have the pulsing, which I imagine the relays will get ride of (getting them in next week!) Wondering why the car will not see them with the resistors though?
    Do you have a quick diagram or method of wiring, or is it is asimple as throwing them in series in the indicator lines on the trailer?
    you need to put the resistors in parallel. LEDs pull very little current, you need to get more current flowing to have the car recognise the trailer is there. It partly defeats the beauty of LEDs, low power!

  4. #14
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    I’ve made a little box that solves this issue for the Range Rover, it’s now permanently mounted on the camper. I’m about to make another box but would first like to know if my design also works with the D3/D4/RRS. I have a suspicion that they are slightly different…

    Anyone in the Brisbane area interested in testing with their D3/4/RRS? If it’s good I’m happy to post the schematics – I don’t want to give it out untested.
    L322 3.6TDv8 Lux

  5. #15
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    I made a box up with 2 relays. The pulse to check the lights isn't enough to operate the relays. A switch means I can bypass my circuit and use non-LED trailer lights as per normal.

    When my circuit is enabled the trailer detection light comes on so I assume the car knows that there is a trailer attached.
    06 SE V6 Discovery 3

  6. #16
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    Hi all,
    Here’s a diagram of the basic wiring to stop the pulsing on a LED trailer.
    Simple and easy to make using either crimp connectors, soldering or fitting into a transportable box if needed.
    Attached Files Attached Files

  7. #17
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    Hi Colin,
    Just questioning the color combination on the PDF that was supplied as it states : -
    Trailer Wiring Colors.

    1 Tail, Clearance - Brown
    2 Left Hand Turn - Yellow
    3 Right Hand Turn - Green
    4 Stop - Red
    5 Electric Brakes - Blue
    6 Earth - White

    Do you mean in the terminals of the plug? If so this is for a 6 pin Plug?
    I havent seen one of these for many years.

    If it is for a Std Australian 7 Pin plug which is the most common then the explanation needs to be clarified.

    Australian Standards States:- (7 Pin Std) is

    1 Left - Yellow
    2 Aux/Reverse - Black
    3 Earth - White
    4 Right - Green
    5 ETBrake - Blue
    6 Stop - Red
    7 Tail, Clearance - Brown.

    Just wanting to clarify before someone goes & wires something without the knowledge of different plugs.

    Cheers

  8. #18
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    My Apologies, your right. I was trying to not make a reference to any specific plug type. The universal colours for Left / Right / Ground are standard. The best reference i’ve found to any particular type of trailer plug is as follows;

    trailer wiring diagram

    I would hope anyone attempting to make this wiring loom up would take the time to do a quick check across the lights with a multimeter.....I have come across an older trailer where the colours were all wrong anyway!

    Hope this as assisted,

  9. #19
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    Thanks Colin. If that’s all good for the D3 I’ve passed.

    Only basic difference I have done is the use of a change over relay - with the resistor between pin 87a and earth. This way the resistor only carries current (heat) while the light is NOT lit. I did this because I was concerned about having the resistor carry the full 12v for extended periods like when the headlights are on – the L322 pulses all 4 lines (parkers and brake lights as well as indicators) – so not an issue for the D3/4. It does however allow the trailer module to detect a failed LED module because the resistor is out of circuit.

    For those interested in circuit boards a 40 cent (15ohm 5watt) ceramic resistor and $6 (PCB mount) relay from Jaycar is all that’s needed for each circuit. Add a $6 blank board and $10 box and its a pretty cheap solution.
    L322 3.6TDv8 Lux

  10. #20
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    Hi harlie, Colin Pederson,

    Thanks for the wiring diagrams and information into stopping the pulsing for Led lights on trailers.

    I only know enough about electronic to get myself into trouble so harlie could you please do a wiring diagram for your solution?

    Dose it have to be wire to the trailer or can it be wire before the plug on the disco?
    Cheers

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