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Zenon Headlight issue... Maybe....

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by roadster198, Oct 17, 2012.

  1. roadster198

    roadster198 Guest

    I have an R129 1998 SL320. When I switched on the headlights to-day they came on as normal but as I went to drive away one of the zenons went out and the warning light came on the dash. I switched them off and back on and all was well warning light went out. Then about twenty miles later going over a bump it went off again. I switched on and off and again all was well. I'm hoping it's just a lose connection as I see on other threads how expensive these lights are.

    Can anyone shed some light on what might be the issue?

    Thanks
     
  2. television

    television Always remembered RIP

    Messages:
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    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    This could be a faulty bulb or connection, you could start by swapping the bulbs from side to side. They are not expensive now on Ebay and best bought in pairs to get a good colour match.

    It could be a dry joint on the controller ECU or the igniter
     
  3. OP
    roadster198

    roadster198 Guest

    Can you tell me where the controller ECU is located under the bonnet? Is it easy to spot?

    Thanks
     
  4. television

    television Always remembered RIP

    Messages:
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    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    85 or 90 it could be in or under the lamp

    [​IMG]
     
  5. Naraic

    Naraic Moderator

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    Your Mercedes:
    2005 CL500.
    A loose earth did the same for mine.
     
  6. OP
    roadster198

    roadster198 Guest

    Where on the R129 can I check if this is the case?
     
  7. Naraic

    Naraic Moderator

    Messages:
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    Your Mercedes:
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    There are earths all over the car. They are brown wires attached to the body/chassis. The one closest to the offending headlamp is the one to look for. In my car it was under the bonnet behind the headlamp.
     

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