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Mercedes Benz E Class towbar wiring question

  • 04-04-2018 9:21pm
    #1
    jmreire
    Registered Users, Registered Users 2 Posts: 8,800 ✭✭✭


    Hi all,
    I am presently fitting a towbar to a 2010 E Class Mercedes Benz ( W212 ). I will use a by-pass relay to avoid triggering any problems with the existing wiring. There is a fuse box located in the boot, drivers side inner 1/4 panel. I am trying to identify a live feed in this box that I can use to power the relay. Has anyone done this already, or can anyone tell me which connection I could use? I have attached a pic of the fuse box, if that helps. It can be magnified. Or maybe it needs a live connection from the fuse box under the bonnet? All advice / comments are welcome.
    Thanks for your help,
    Jim.


Comments

  • #2
    blackbox
    Registered Users, Registered Users 2 Posts: 4,715 ✭✭✭blackbox


    I wouldn't go near that without a wiring diagram.

    Any time I have installed hitch wiring I ran a supply from the battery (via fuse).

    .


  • #3
    jmreire
    Registered Users, Registered Users 2 Posts: 8,800 ✭✭✭jmreire


    blackbox wrote: »
    I wouldn't go near that without a wiring diagram.

    Any time I have installed hitch wiring I ran a supply from the battery (via fuse).

    .

    Hi Blackbox. In previous car's ( Skoda Superb and Skoda Octavia ) That's exactly what I have done, but wondering if it will be Ok to do it in a Merc? There is a dedicated harness that can be bought ( bit expensive though ) and it's a simple plug and play setup. In this, harness that the trailer socket plugs into, you have all the cables that you need, and I think that it's possible to connect to the live feed in this loom. Could be wrong on this though......for the lights etc, I can use the existing light cables on the relay box. If all goes to all, for sure I will run a fused cable from the battery back to the relay.
    Thanks for your advice,
    Jim.


  • #4
    gctest50
    Registered Users, Registered Users 2 Posts: 9,605 ✭✭✭gctest50


    They're already wired for it, there is a proper wiring kit for them - tells the car when it has a trailer attached ( probably braking stability ???)

    You have to connect car to computer and tell it that it now has a tow hitch


    https://www.pfjones.co.uk/Wiring_instructions/19040510RC.pdf


  • #5
    jmreire
    Registered Users, Registered Users 2 Posts: 8,800 ✭✭✭jmreire


    gctest50 wrote: »
    They're already wired for it, there is a proper wiring kit for them - tells the car when it has a trailer attached ( probably braking stability ???)

    You have to connect car to computer and tell it that it now has a tow hitch


    https://www.pfjones.co.uk/Wiring_instructions/19040510RC.pdf

    Thanks gctest50, that's a good site you directed me to, very professional. I guess that the kit being used in the instruction is the proper wiring kit..and maybe I will have to go down that road,.but my question was how to identify a live terminal in that fuse box ( which the proper kit utilises ) and use the same by-pass relay that I have used in the previous car, and which is MB approved. This of course may not be possible, and then it will be the pfjones system.
    Thanks again for your help, it's appreciated,
    Regards, Jim


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