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Ala USA Marker Lamps: Creating a Custom USDM Module for Mercedes W124 - Koerun Signal Integration

Bolo1327 6969 16
Best answers

Jak zrobić w Mercedesie W124 moduł, który po włączeniu pozycji zapali obie żarówki, a po włączeniu kierunkowskazu zgasi jedną z nich i zacznie migać?

Najprościej zrobić to na oryginalnej oprawce pod dwuwłóknową żarówkę 21/5 W, bo w amerykańskich W124 tak to było fabrycznie rozwiązane [#16692913][#16692849] Jeśli masz pomarańczowy klosz, wystarczy zwykła pomarańczowa 21/5 W, więc nie trzeba kombinować z własnym modułem [#16693466] Do odcięcia postojówki po stronie kierunku można wykorzystać styki w przełączniku świateł pod kierownicą, jeśli wyprowadzono z niego przewody na zewnątrz [#16692843] W wątku zwrócono też uwagę, że istnieją gotowe, homologowane zestawy markerów/lamp do kupienia i montażu zamiast przeróbki DIY [#16692792]
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
  • #1 16692092
    Bolo1327
    Level 7  
    Posts: 5
    Hello, I like the marker lights in cars very much, I have a Mercedes W124 and I did the front marker lights in the direction indicators, I did it in such a way that I gave a second bulb in the direction indicator, attached to the position, request? The tablecloth was on all the time and when I gave the indicator light, the second bulb was blinking, Unfortunately it is hard to see when I turn on the indicator so I came up with a different plan.
    I would like to make some simple "USA Module" (solder some electronic components, close in a small plastic box)

    I would like the Koerun signal bulb to be somehow connected to the position light (After the position lights up the bulb from Direction also lights up) and when I throw the indicator light, it will start flashing and the other indicator light goes out, After turning off the Koerun signal indicator, both bulbs are on again.

    And here I am asking for help, As I am "Green" in electronics, would someone be able to make me a list of what I will need and a diagram of how to connect it all?
    I will be very grateful for people who will help or guide you a little :)
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  • #2 16692105
    Grzenio8595
    Level 13  
    Posts: 358
    Help: 8
    Rate: 49
    And wouldn't it be easier to do it on an orange two-fiber bulb?

    Moderated By tzok:

    3.1.1. Do not share illegal material or other information that violates the law.

  • #3 16692280
    Bolo1327
    Level 7  
    Posts: 5
    Grzenio8595 wrote:
    And wouldn't it be easier to do it on an orange two-fiber bulb?


    Do you mean that one fiber would normally act as a kerun signal and the other should be hooked, for example, under the position and shone as an outline? If that's what you mean, not really

    Added after 14 [minutes]:

    Adds a Link to the Movie to show what I mean more or less

    https://m.youtube.com/watch?v=S8V383ZXUfE
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  • #4 16692623
    bearq
    Level 39  
    Posts: 4878
    Help: 414
    Rate: 1598
    Ready modules are available in the range of PLN 100-130. I also do not know if you know, but they will take your proof from the machine :)
  • #5 16692749
    Bolo1327
    Level 7  
    Posts: 5
    bearq wrote:
    Ready modules are available in the range of PLN 100-130. I also do not know if you know, but they will take your proof from the machine :)


    Oh, I'll look for it in a moment, it depends on the Police :)
    I have had a lot of time with Obrysówki, Even the crash happened in front of the police and the Obrysówki did not stick to
  • #6 16692769
    750kV
    Level 33  
    Posts: 1934
    Help: 239
    Rate: 702
    Colleague bearq is right with this registration certificate. The purpose and type of the light source are written on the shade. The very use of a light source other than the dedicated one causes the loss of approval of the entire lamp. This bodes problems.
    I recommend reading this: Link
  • #7 16692792
    kkknc
    Level 43  
    Posts: 23442
    Help: 1901
    Rate: 6610
    Marker lamps can be purchased and legally used after installation, as approved. Hella once had such a set on offer.
  • #8 16692813
    Bolo1327
    Level 7  
    Posts: 5
    Gentlemen, but no one wrote here whether they should be legal or not :) I just asked The question, would someone kumaty give you some schematics how to connect it to make it work: p
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  • #9 16692819
    kkknc
    Level 43  
    Posts: 23442
    Help: 1901
    Rate: 6610
    Perhaps you would ask where to find drugs? It doesn't matter if it's legal or not. It is important that someone who is kumaty as you put it, figured it out.
    The subject is suitable for the trash. You want to carry 4 letters, do it legally. You like such lamps, it's also legal. It is not possible to pack suitcases to the USA. Live there, live, earn money and drive a car that has something, not a substitute for it.
  • #10 16692843
    Megawe
    Level 34  
    Posts: 2657
    Help: 246
    Rate: 1423
    In the light switch, under the steering wheel, there are contacts that close when the direction is turned and make the stop on the given side shine after the key is removed. These styles can be used to turn off the parking lights when the turn signal is turned on. if there are cable leads outside and not inside the switch.
  • #11 16692849
    terminux
    Level 23  
    Posts: 986
    Help: 23
    Rate: 166
    In some car brought (probably W116) from the States there was a holder for two-filament bulbs. This is how it is made in the original and it works. What bulbs did you use, i.e. what power? Maybe you had the wrong power of the bulbs, so you could not see the indicator light?
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  • #12 16692893
    Strumien swiadomosci swia
    Level 43  
    Posts: 27411
    Help: 1403
    Rate: 6379
    Apply 2 filament bulb and close emat.
  • #13 16692913
    Dziarski Hank
    Level 34  
    Posts: 2051
    Help: 245
    Rate: 927
    Originally, this model for the US market had just a two-fiber light bulb.
  • #14 16693057
    Bolo1327
    Level 7  
    Posts: 5
    Dziarski Hank wrote:
    Originally, this model for the US market had just a two-fiber light bulb.


    Only firstly, it's original, hard to get, and secondly, when you find it, you need to give a little PLN: p
  • #15 16693073
    kkknc
    Level 43  
    Posts: 23442
    Help: 1901
    Rate: 6610
    And DOT approval. Instead of E xx
  • #16 16693466
    terminux
    Level 23  
    Posts: 986
    Help: 23
    Rate: 166
    What shade do you have? If orange, then an ordinary 21 / 5W two-filament light bulb is 21 / 5W orange.
    And do not exaggerate that orange bulbs are very expensive because I found them for about PLN 8 each.
  • #17 16693503
    kwok
    Level 40  
    Posts: 6229
    Help: 493
    Rate: 1332
    And I @ bolo1327 wish he had a collision with someone who has a recorder and will testify that he saw a turn signal in pain and it misled him.
    Orange SIDE lamps are permitted and otherwise required in Europe and are to be visible from the side, not from the front. The white and red marker lamps shall be visible from the front and rear. Making Christmas lights on the car = misleading other drivers with "zenons" should be punished with 5 years in prison without the possibility of early exit.

    Moderated By tzok:

    ... and let that be the end of this topic. The only correct answer is: such a modification violates our law and is illegal, and helping to commit a prohibited act is also a prohibited act.

Topic summary

✨ The discussion revolves around creating a custom "USA Module" for the Mercedes W124 to integrate marker lamps with direction indicators. The user seeks assistance in designing an electronic circuit that allows the Koerun signal bulb to illuminate alongside the position light and flash when the indicator is activated, while ensuring both bulbs remain lit when the indicator is off. Various responses suggest using a two-filament bulb, highlight the importance of legal compliance regarding light sources, and mention the availability of ready-made modules. Concerns about the legality of modifications and the potential for issues with law enforcement are also raised, alongside technical suggestions for wiring and bulb specifications.
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FAQ

TL;DR: Want US‑style marker/turn signals on a W124? Modules cost PLN 100–130, and “Ready modules are available.” [Elektroda, bearq, post #16692623]

Why it matters: This FAQ helps DIYers decide between a legal, approved setup and risky hacks while keeping indicators visible and safe for traffic.

Quick Facts

What is the “USA module” people mention for the W124?

It’s a small add‑on that ties the front turn‑signal bulb to the parking/position circuit so it glows as a marker, then blinks for turns. The original poster wanted both bulbs on with position lights, then the indicator side flashing while the opposite side goes off. “USA module” here means a simple boxed circuit you solder and insert into the lamp wiring. [Elektroda, Bolo1327, post #16692092]

Is converting front indicators into marker lights legal?

A moderator closed the debate stating the modification violates local law and aiding it is also prohibited. If you need the look, use approved components designed for the function. Quote: “The only correct answer is: such a modification… is illegal.” [Elektroda, kwok, post #16693503]

Can I achieve the effect with a two‑filament bulb?

Yes. US‑market W124s used a two‑filament bulb that serves as marker and turn signal in one housing. Swapping to the correct dual‑filament holder and wiring replicates the intended operation without ad‑hoc add‑ons. This mirrors the factory US solution. [Elektroda, Dziarski Hank, post #16692913]

How much do ready‑made USA modules cost?

Expect around PLN 100–130 for off‑the‑shelf modules that integrate marker and turn signals. This is a common price range reported by forum users sourcing aftermarket units. Buying a ready module avoids custom PCB work. [Elektroda, bearq, post #16692623]

Are there legal, approved marker lamp kits I can install?

Yes. Marker lamps with approval marks have been sold as retrofit sets. One user notes Hella previously offered a compliant kit. Using approved lamps maintains conformity and avoids inspection trouble. “Marker lamps can be purchased and legally used after installation.” [Elektroda, kkknc, post #16692792]

What risks come from changing bulb types inside a lamp?

Changing to a non‑dedicated light source can void the lamp’s approval. The lens states the purpose and source type; altering it can invalidate certification and attract enforcement. This creates compliance and insurance risks after incidents. [Elektroda, 750kV, post #16692769]

Will police really pull my registration for this mod?

A user warned that officers can seize the registration certificate for non‑approved lighting modifications. While experiences vary, plan for scrutiny if your lamps no longer match their approval. Choose certified solutions to avoid hassle. [Elektroda, bearq, post #16692623]

What bulb spec works for orange lenses, and what do they cost?

For orange lenses, use a standard 21/5W dual‑filament orange bulb. The reported street price is about PLN 8 per bulb. This setup preserves marker brightness while keeping the turn filament distinct. It’s an inexpensive first step. [Elektroda, terminux, post #16693466]

Why is my indicator hard to see after adding a second bulb?

Mismatched wattage can wash out the flashing signal. If the marker filament is too bright, the turn signal loses contrast. Use the correct dual‑filament rating and suitable lens to restore visibility. “What bulbs did you use… wrong power?” [Elektroda, terminux, post #16692849]

How can I temporarily disable the parking light while the indicator blinks?

Use the W124 light‑switch contacts under the steering wheel. Those contacts can feed the standing light, and you can repurpose them so the parking light on that side turns off when the turn signal activates. Verify external leads first. [Elektroda, Megawe, post #16692843]

What does USDM/marker/“Koerun signal” mean in this context?

USDM refers to the US‑market version of a car. Marker means a steady position/outline light. “Koerun” in the thread is the front turn‑signal bulb the poster wants to dual‑purpose. The US W124 used a combined setup. [Elektroda, Dziarski Hank, post #16692913]

Does using US‑market parts change my approval marks?

Yes. US parts carry DOT markings, not E‑marks. Mixing approvals can cause issues during inspections in ECE regions. One user explicitly pointed out DOT instead of E‑marking when using US components. [Elektroda, kkknc, post #16693073]

Is there a simple three‑step way to add a dual‑filament setup?

  1. Source a dual‑filament holder compatible with your housing.
  2. Install an orange 21/5W bulb; wire 5W to position, 21W to turn.
  3. Test for indicator dominance and adjust grounding and connections. “Holder for two‑filament bulbs… works in the original.” [Elektroda, terminux, post #16692849]

Can I just do it and ignore legality since others did?

Anecdotes vary, but enforcement remains possible. One user said police tolerated side markers; another warned of seized registration. Relying on luck is risky; install approved lamps or factory‑style components to stay compliant. [Elektroda, Bolo1327, post #16692749]
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