Help Needed with LED bulbs

Discussion in 'Electronics' started by CiaranMcKeown, Nov 4, 2008.

  1. CiaranMcKeown

    CiaranMcKeown Hardcore MB Enthusiast

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    Ok, so i went out and got myself a set of LED sidelights to go beside my Xenon headlights because i hate the orange look of the original sidelights. I also got 2 Festoon shape bulbs with white LED's for the illumination of the rear number plate as one of those had blown so i thought the LED's there would clean up the look of the rear.

    Now i read somewhere that when you fit LED bulbs you have to fit a resistor somewhere or somehow to fool the Bulb Warning coming up in the dash, so, i need a little more information on what materials i need to go and get and where i can go and get them.

    Once i get it done I will post a detailed how to for everyone else with before and after shots of the front and back. Thanks in advance.
     
  2. franey

    franey Hardcore MB Enthusiast

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    If you shop around you can actually buy the LED bulbs that have the resistor already fitted but they are a tad more expensive than the basic ones.
     
  3. Smatt

    Smatt Hardcore MB Enthusiast

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    I think I read that some cars only have bulb failure warnings on certain lights- ?interior not included on some & might not be on the number plate- try taking a bulb out & see if it triggers dash warning. If not, then no need to worry about resistors!
     
  4. OP
    OP
    CiaranMcKeown

    CiaranMcKeown Hardcore MB Enthusiast

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    Yeah the following are lights that trigger a warning (that i know of)

    Headlights
    Sidelights
    All indicators ( including the wing mirrors )
    Brake light
    Tail light
    Reverse light
    Fog light front and rear
    Number plate lights

    So i think all exterior lights have wattage sensitivity.

    I know my interior boot light does not work and theres no warning for that.

    Front searching for housr yesterday i have found that there is a person on ebay that sells the good sidelights and also sells a crimp resistor that will fool the OBD that there is a correct bulb. So orderd a few and i'll let yous know how i go.
     
  5. A-AvantGarde

    A-AvantGarde Hardcore MB Enthusiast

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    I've not had much luck trying to source some festoon LED bulbs with built in resistors for number plate lights.

    I was suggested BREX do such a thing but can't find anyone that stocks them, although that's probably a good thing as my source in the US suggests that they're about $110 dollars :eek:
     
  6. login_user

    login_user Hardcore MB Enthusiast

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    go to maplings and buy 2x 22Ohm 7W resistors and connect them in parrallell, thats what i did and they work fine.
     
  7. Gareth

    Gareth Hardcore MB Enthusiast

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