Polarity - Indicator Socket - 203 209 211 215 219 220 230 245 164 171

Discussion in 'Electronics' started by GLK, Jun 5, 2018.

  1. GLK

    GLK Hardcore MB Enthusiast

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    I need help in identifying polarity of the indicator socket, in these models:

    164 - 171 - 203 - 209 - 211 - 215 - 219 - 220 - 230 - 240 - 245 - 251

    These are the models, where this indicator lamp holder is used - A0018261982

    [​IMG]

    It looks like this, when fitted:

    [​IMG]


    The headlight socket would look like this, when the holder with the bulb is removed (the alignment spot is indicated with an arrow):

    [​IMG]

    I need to know, if the contact marked [+] in this picture is in fact positive in your car?

    I know it is ground in 169, which unfortunately prevents me from fitting a dual function harness I put together:

    [​IMG]

    Just need to know, if any of the above models are wired correctly, i.e. plus is at the bottom, and ground is on the bulb's body - which would mean the contact I marked [+] in the above picture, is indeed positive.

    The lamp holder is universal, there's no left and right part, so any one of the headlights (presumably the one you can access easily) will be great! :)
     
  2. OP
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    GLK

    GLK Hardcore MB Enthusiast

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    Forgot to say - to remove the holder, turn it anti-clockwise ⅛ of a turn, and pull out.

    There are arrows on the socket and the headlight to align, but basically, keep turning slowly until it goes in (there's only one right position), then turn clockwise until locked (if you never replaced a turn indicator bulb before).

    I'd really appreciate some help here - I need to know the models my contraption will work with, as it'll be a shame to bin it :(
     
  3. m80

    m80 Hardcore MB Enthusiast

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    I know you weren't asking about a 639 but had a look anyway in case the info might be useful.
    The lamp holder removed, although similar, isn't the same so sorry this is a useless post.
     
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  4. OP
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    GLK

    GLK Hardcore MB Enthusiast

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    Not at all, thanks Martin.

    I can't believe Mercedes would wire the sockets wrong way round!

    And I had an actual spare headlight to play with (kindly donated by David Richardson).

    First I thought it was just that one, then - it was just my car (unlikely, right?) ... now I know, at least pre-facelift Avantgarde headlights are all like that!

    The list of models I pulled from EPC, although my version is 2015, so there could be newer models with this bulb holder too.
     
  5. m80

    m80 Hardcore MB Enthusiast

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    If polarity is the issue have you considered a bridge rectifier?

    The diodes may well have to up sized from the 1/4 watt diode,
    and then there is the volt drop across 2 diodes. But maybe feasible depending on the LED voltage and the resisitor reduction to 'up' the voltage to compensate??
     
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  6. OP
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    GLK

    GLK Hardcore MB Enthusiast

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    Thanks, I haven't actually.

    The problem is the ground is shared, obviously, and I've converted the plugs to BAY15D, with two different positive at the bottom (White DRL and Amber Turn Indicator), and one negative on the side to touch the bulbs body. I must have amber signal positive at the correct point in the headlight socket, which means somehow reaching the two wires and x-splicing them. Practically impossible without taking the headlight apart :(
     
  7. OP
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    GLK

    GLK Hardcore MB Enthusiast

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    Anyone with a multimeter and a couple of minutes of free time, please?

    I decided to offer the entire harness with bulbs and DRL controller for sale (at cost), as I can't modify my headlights to accommodate it, but must know the models with correct polarity (most, if not all of them, I suspect).

    It really is a matter of testing impedance between the marked contact, and any of the car's ground points. It it's zero, then the contact is negative/ground - can't be simpler.

    The models again, are:

    W164 . R171 . W203 . W209 . W211 . C215

    C219 . W220 . R230 . W240 . W245 . W251
     
  8. OP
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    GLK

    GLK Hardcore MB Enthusiast

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    Errm, kinda bump - I'd really appreciate some input here.

    I hate to bin a pair of well built, dual function lights, when similar kits go for well over £100 ... and mine doesn't require any mods on the existing lamp, so return to stock is just a matter of unplugging the new one, and putting back the original plug with filament bulb.
     
  9. pmcgsmurf

    pmcgsmurf Hardcore MB Enthusiast

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    I'll check a couple of 211's later.....
     
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  10. OP
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    GLK

    GLK Hardcore MB Enthusiast

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    Thanks Patrick, appreciate it!
     
  11. pmcgsmurf

    pmcgsmurf Hardcore MB Enthusiast

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    Bottom connector front left & right on a W211 E55 2004 buzzes out to chassis/earth.
     
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  12. OP
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    GLK

    GLK Hardcore MB Enthusiast

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    Thanks!

    Is that the one I marked with [+] - it's a few mm past the alignment arrow, clockwise?

    The alignment arrow on the plug is visible here, at about 2 o'clock - there's also a little fin sticking out:

    [​IMG]


    The corresponding arrow on the headlight unit would be where I put the red arrow here:

    [​IMG]

    The contact, that's supposed to be positive, is right next to it.

    [​IMG]

    The negative/ground one is 180º opposite. At least I hope it is :)
     
  13. pmcgsmurf

    pmcgsmurf Hardcore MB Enthusiast

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    What I mean is on the light fitting itself.

    The ground/earth/chassis is at the bottom at the six o'clock position.
     
  14. OP
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    GLK

    GLK Hardcore MB Enthusiast

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    Yes, the pictures above (with silver [+] and red markings) show the turn indicator socket, it simply been cut off from the headlight unit.

    Unfortunately, the only definitive orientation for this socket, is the location of the alignment arrow - it would normally be at the top, as it is logical to insert the bulb holder with the arrow/fin pointing up, but ...

    Just want to be 100% sure :)
     
  15. OP
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    GLK

    GLK Hardcore MB Enthusiast

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    A little footnote to this thread, in case someone else is facing the same dilemma ...

    In the end, I bit the bullet, armed myself with a few long surgical forceps and other scary grabby pincer gadgets, a dentist mirror, and went into the headlight, via the dipped beam cover.

    I had prepared four splicing connectors beforehand, and managed to re-wire the turn indicator socket, without opening the headlights, or even removing them from the car.

    Pretty sure I can do open heart surgeries now ... o_O

    The result is: I now have a fully working dual-fuction DRL/Turn Signal lights, with automated switchover, correct actuation by SAM (turn signal and hazards), and DRL controller.
    No conflicts, no errors, and if I want to revert back to OEM - the original tungsten bulbs work fine, just as before, and all it takes is to remove one bulb holder, and insert the other.

    I still am quite puzzled, as to why would Mercedes wire a bulb socket in contravention to universal convention (ground is always on the bulbs body, plus is at the bottom contact)?

    :)
     
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  16. OP
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    GLK

    GLK Hardcore MB Enthusiast

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    Here it is:

    [​IMG]

    ;)
     
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  17. clk320x

    clk320x MB Club Veteran

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    Get a video up David :) well done on getting it working!
     
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  18. OP
    OP
    GLK

    GLK Hardcore MB Enthusiast

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    Yeah, got a short video (those are screenshots above), but as it was still daylight, it looks too bright and not very distinct - I had to edit the amber light shot, to show the colour a bit.
    In fact, the light is really bright orange and is better than my OEM silver bulbs. As always, a human eye, and a camera perceptions differ.

    I'll get another video done, when it's dark.
     
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  19. OP
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    GLK

    GLK Hardcore MB Enthusiast

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    Took a short video - by myself, so used a 'surround light delay' & 'follow me home' features - to show the turn indicator / DRL function switchover.

    Normally, in DRL mode, the position lights would be off.

    Both DRLs (fog and indicator) are set to go off completely, rather than dim, when the dipped beam comes on.

     
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