Towbar Wiring - S211 - Help please!

Discussion in 'Electronics' started by 5tephen, Nov 22, 2018.

  1. 5tephen

    5tephen New Member

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    Nov 22, 2018
    Location:
    Ss7 2ah
    Car:
    S211 2005 e320
    I have fitted a towbar to my 2005 e320 estate. I was sold a 7 pin wiring kit with a relay. I've found the indicator wires but the side/brake seems to be the same wire. Side/brake bulb is a single filament bulb. Do I need the more expensive plug in wiring kit dedicated to the car? If so can anyone recommend one.
    Thanks
    Stephen
     
  2. pmcgsmurf

    pmcgsmurf Hardcore MB Enthusiast

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    Can't help sorry, only ever fitted a dedicated one that goes into rear SAM.
     
  3. OP
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    5tephen

    5tephen New Member

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    That's the route I think I'm going to have to take, but as I have the relay one I was wondering if it can be used.
     
  4. Merc220cls

    Merc220cls Hardcore MB Enthusiast

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    I agree, dedicated electrics are the best route nowadays.
    I used to fit tow bar & electrics back in the day when car electrics were simple but with modern CanBus systems etc. dedicated ones are best.
    My 2017 CLS Shooting Brake tow bar wiring was the easiest I’ve ever fitted, simply plug & play so to speak.
     
  5. pmcgsmurf

    pmcgsmurf Hardcore MB Enthusiast

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    Agree, I did this on the W211 and all just plug in.
     
  6. toolman1954

    toolman1954 Hardcore MB Enthusiast

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    2003 320 CDI Avantgarde, 1997 312d Sprinter
    Hi,
    your wiring should not not be too different to mine, pull off the near side rear panel for the wiring, from the photo you can see where I have exposed the wires. car wiring... Green to red to connection 6 of TEB7AS
    Black / green to green to connection 3
    Black / white to yellow to connection 1
    Red / black to black to connection 7 ..... these are the only "lights" wires, the rest of the connections from TEB7AS go elsewhere. You should have a wiring diagram with your wiring kit, most use a similar TEB7AS so you can work out what is what, or else get yourself a pointed circuit tester and prod it into the wires and test what is what when it lights up. This all works ok for me. The only problem I found was that the tow hitch causes the parking sensors to bleep. So just turn them off. If you use a proper wiring kit, then also factor in the cost of getting the car onto a STAR to tell it to ignore parking sensors. Chaep kit works fine for me and I just remove tow hitch when I am not using it.

    Steve

    20181122_153603A.jpg
     
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  7. 320Alan

    320Alan Hardcore MB Enthusiast

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    I fitted my own tow bar but chickened out say the wiring and got an auto electrician to wire it up and glad I did. As the s211 has led rear lights so it was a right ball ache and needed a specific wiring really to fit a 7 pin socket.

    He started with a standard realy, oh you have leds ok back in an hour, oh this into work either looks like I need to order one in. The £50 job was £120 and I'm sure he didn't make much out of me after the time he spent.

    Ps parking aensens were knackered before haand so no idea if they work with the tow bar.
     
  8. toolman1954

    toolman1954 Hardcore MB Enthusiast

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    Apologies for some slight **** up on my description,............... just ignore the "to connection " 3../...1../...7 .. ..as I wrote... .. these are the output terminals for wires to the 7 pin plug and need wiring as per the instructions to European Standard.

    So Vehicle side of relay ... as per the new TEB7AS diagram below .....
    Green to red............Brake lights
    GN/BL to green..........R/H indicator
    BL/Wh to yellow .........L/H indicator
    R / Bl to black ..........L/H tail light
    White to Earth
    Brown .........R/H tail light unused.
    On my wee old Freedom Microlite caravan, I had no reversing lights, nor fog lights so these wires were not used. You can see what is what in the photo.

    @320 Alan..... I presume your auto elec started out not using a TEB7AS ( £20 ish off Ebay) which just uses a low voltage to trigger the relays inside of the TEB7AS to accommodate LED lights. £120??? mmmmm.

    Steve.

    [​IMG]
     
  9. Ted

    Ted MB Club Veteran

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    Problem comes when they use pwm to drive a single filament bulb for tail and brake lights.
     
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    5tephen

    5tephen New Member

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    Location:
    Ss7 2ah
    Car:
    S211 2005 e320
    Nice looking imp. pmcgsmurf,
     
  11. OP
    OP
    5tephen

    5tephen New Member

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    Nov 22, 2018
    Location:
    Ss7 2ah
    Car:
    S211 2005 e320
    Thats my problem

    I don’t think the TEB7AS, which I have, will work as I can’t find a separate wire for the Brake/ side lights, toolman1954, my E320 is a 2005.
     
  12. Ted

    Ted MB Club Veteran

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    There won’t be a separate wire.
    You could run a wire from the front sidelight or number plate light, and another from the third brake light maybe?
     
  13. OP
    OP
    5tephen

    5tephen New Member

    Messages:
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    Joined:
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    Location:
    Ss7 2ah
    Car:
    S211 2005 e320
    I was wondering that too. Next find the feeds to the tailgate.
     

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