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Thread: Disco 4 trailer plug

  1. #31
    Join Date
    Aug 2017
    Location
    brisbane
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    Hi everyone, this is my first post and hopefully in a thread that can help and is somewhat related. I picked up a 2013 D4 HSE a few months ago and auto electrics is not my field of expertise . I have two questions – Firstly, I am towing a camper trailer with a 7 pin flat plug, LED lights and manual override brakes. I understand the issue with the D4 not recognising the trailer and the threads have been very helpful with that. I have purchased a 7 pin large to 7 pin flat adaptor and I’m ok with not having load resistors at the moment as the trailer brake and indicator lights work fine.

    However, the trailer tail lights do not work at all. I have connected a trailer light board with incandescent bulbs to the D4 and same thing – brake and indicators work fine but no tail lights, so it can’t be a LED issue.

    I’m wondering if this is a problem with the wiring in my car’s large black plug, or if it is a common problem and I have missed something else that needs to be done?
    Any advice would greatly appreciated. If I need to rewire the vehicle plug, does anyone know of a good auto electrician on the northside of Brisbane?

    Secondly, when I was playing round with the plugs, I had the engine off and the headlights turned on. After 10 mins the battery (new in July 2017) was flat. It’s a 95ah AGM battery and I expected that I could get 10 mins out of it without the engine running. I’ve got the Xenon headlights, so I am wondering if they drain the battery faster or whether the battery is not functioning correctly.
    Thanks

  2. #32
    Join Date
    Jul 2010
    Location
    Hunter Valley NSW
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    The 7pin round to 7pin flat adapters dont work without rewiring the round plug easy to do
    Rewire round plug to suit the RH normal socket 12N


  3. #33
    Join Date
    Aug 2017
    Location
    brisbane
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    Appreciate the diagram. I'll see how I go otherwise off to the auto elec. At least you've identified the problem for me and shouldn't be too hard......

  4. #34
    Join Date
    Jun 2020
    Location
    Alexandria
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    Quote Originally Posted by ytt105 View Post
    Smocky

    You could just wire an additional couple of small globe blinkers onto the CT.

    Problem solved.

    i have problem with running lights, after using a standard 7pin round-to-flat adaptor to connect my trailer to my D4. Does any one how what I can do to make it running properly?

  5. #35
    Join Date
    Aug 2017
    Location
    brisbane
    Posts
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    I eventually worked out that there is a separate fuse (behind the glove box) for trailer tail / side lights. In my case, that fuse was blown and simply replacing it solved the problem and a standard round to flat adaptor worked fine. Check the manual for the fuse number. I can't recall exactly what it was named, but I think it was something like 'side lights'.

  6. #36
    Join Date
    Apr 2012
    Location
    Whyalla, SA
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    I’ve been using a standard round to flat without issues

  7. #37
    Join Date
    Oct 2019
    Location
    Perth
    Posts
    91
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    Quote Originally Posted by Tombie View Post
    I’ve been using a standard round to flat without issues
    +1

    I had the same issue as the OP, Disco round plug vs my Jayco Swan Outback 12 pin flat plug.

    On the weekend I rewired the Swan Outback 12 pin flat plug to a 7 pin flat plug, and ran an Anderson in parallel with a Traxide kit, and grabbed a round to 7 pin flat adaptor from Supercheap.
    Took it for a spin to test and it all works perfectly including the electric brakes.

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