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Xenon problem wont stay on when starting car - M-Class Mercedes-Benz Cars & Trucks

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  • evrotrader Oct 01, 2008

    Hi everybody, on Mercedes ML 2003 year of production I have my xenon light going off after an hour of lighting( when I'm starting it its ok, but after an hour if I will turn it off it won't start again) what is the problem? I have changed several bulbs and ballats but the problem still exists

  • yadayada
    yadayada May 11, 2010

    Xenon what??

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The ballasts take the 12v power of the car and amplify it to 22,000 volts to ignite the lights. After that, they run at a constant 85-95 volts to keep the lights on. You may have a weakness in the electrical system that is causing the battery voltage to drop just enough during startup that the lights won't ignite. Are you turning them on before cranking the engine? You shouldn't do that for a few reasons (if you are) - one, the life of the xenon ballasts can be severely shortened by flickering, and two, having the lights on puts additional strain on the battery while starting, as most of its amperage is needed to turn the engine over. Get a piece of 10 gauge wire (a stereo shop can sell it to you) a couple feet long. Put a ring terminal on each end and attach one to the battery's negative side, and the other to a bolt in the engine bay. This will give your car an additional ground point that can help its conductivity better and it may help to alleviate your problem.

If the problem is simply that the lights will not turn on, you may need either new bulbs or new ballasts. They're very expensive from a Mercedes dealership (on my Audi, the bulbs are over $200 each and the ballasts are even more) but you can find them online for a fraction of that.

Posted on Sep 10, 2008

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