Question about Mercedes-Benz ML350

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My Ml350 has left brake lamp out warning lite on change the blub (7506) still won't work is there a fuse that protect it the other two are on

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  • frak Jul 01, 2009

    This is not a cheap bulb and I checked it with my ohm meter and its good the bulb holder is not melted
    the bulb won't light is there a fuse for it???

  • frak Jul 01, 2009

    I'm ure there's no voltage to this bulb, the one was in there was not bad, Is there a fuse for the left bulb????

  • frak Jul 01, 2009

    I just removed the spare and there is no diagram there, DARN

  • frak Jul 01, 2009

    Thanks i'll be looking forward to your reply tomorrow.



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My immediate thought on this is that some bulb-failure monitoring systems don't like cheap bulbs.

Are you saying the bulb is now working but the failure lamp is still lit?

However if the bulb is not lighting at all - even new bulbs can be faulty out of the box. I would advise that you first of all replace with a good quality bulb like Osram before any further trouble shooting.

Posted on Jun 30, 2009

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  • Radio Code Pro
    Radio Code Pro Jun 30, 2009

    Feel free to use the comment button to give me some more detail if this does not resolve the issue.

  • Radio Code Pro
    Radio Code Pro Jun 30, 2009

    Please be aware

    I have checked through my tech manuals and a number of Mercedes cars have been recalled owing to a manufacturers fault where the rear brake light bulb holder melts and fuses to the rear tail light assembly.

    In this case when bulbs do fail it is impossible to replace them as the actual bulb holder has become faulty. It is also a potential fire hazard due to the melted plastic. You can phone a dealer to check if your serial no. is effected by this recall.

    Please let me know how you get on.


  • Radio Code Pro
    Radio Code Pro Jul 01, 2009

    I am going to see if I have the fuse diagrams for this model.

    However for your info you should have a fuse diagram in your car. It should be in the spare tire area where the wheel chock is.

    It's a little paper pamplet in a 3'' by 4'' square. Assuming you have a spare, remove the spanner and foam insert, lift the tire up and it should be under the wheel chock.

    If you have the tire foam/ compressor instead, it should be in a cubbie hole on the left also under the cargo floor. Hope this helps.

    I will also do some further investigation.

  • Radio Code Pro
    Radio Code Pro Jul 01, 2009

    There is a fuse for it - yes - but it may also be related to a relay or fault with the brake switch. I am still trying to identify which fuse is in the circuit. Bear with me.

  • Radio Code Pro
    Radio Code Pro Jul 01, 2009

    Yes double darn!

    I may be able to get this for you tomorrow. There are 3 fuse boxes in this vehicle so we need the diagram!

    Also there is a known issue with faulty brake switches on the ML350 but I would have thought that would leave both brake lights out. Fuse or relay looks most likely.


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Maybe the bulb is blown out, so you could try to replace the bulb. If not this you can try to go to the dealer ,sometimes the light on the dash board will malfunction and you can get your dealer to have it looked at , if they find the problem they will fix it ,and the light will turn off.

Posted on Jul 01, 2009


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