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Disco 2 No brake light when the light is on

Discussion in 'Land Rover Discovery' started by berg450, Sep 22, 2020.

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  1. berg450

    berg450 Active Member

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    Hi all
    Just discovered an electrical problem and no idea what could be the reason. I have both brake lights working when the lights are not on, but when i turn on the lights and push the brake only the right one works but the left turns off ( no light at all). When i relese the brake it works again.
    Any idea what to check?
     
  2. marksman

    marksman Well-Known Member

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    Sounds like it will be a poor earth somewhere on the brake light circuit
     
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  3. berg450

    berg450 Active Member

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    Any idea where to check?
     
  4. marksman

    marksman Well-Known Member

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    No not really I don't have access to a wiring diagram but I would have a good look at the light clusters and trace the cable to see if there is anything obvious
     
  5. sierrafery

    sierrafery Well-Known Member

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    Hi. First suspect is the contact in the cluster or at the cluster's plug cos if it's weak it fails due to the brake filament's extra load so check the cluster's internal circuit and it's plug first
     
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  6. berg450

    berg450 Active Member

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    Thanks Fery!
    Do you mean the connector which connects the lamp asm to the wires come from the car body?
    upload_2020-9-23_10-58-52.png
     
  7. PaulJM

    PaulJM Member

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    I think you will find that the earth wire to the cluster that goes out is broken or corroded. What is happening is the power is going to earth via the other bulbs in the cluster, but when you turn the lights on you are losing the path because you have added the lighting power.
     
  8. Stanleysteamer

    Stanleysteamer Well-Known Member

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    First stop, take the bulb out and clean all the contact surface on both bulb and holder. If nec fit a new bulb, then go from there. (Irecommend one of those glass fibre pens for cleanaing up contacts, they are brill!) Mine came with a load of spare brushes. Not sure if mine is exactly the same make but lots of places do them. So useful.https://www.ebay.co.uk/itm/HAMA-GLA...EN-BATTERY-CONTACT-CLEANER-5629-/191130022766

    If the bulb works sometimes then there must be power to it running down a cable which therefore cannot be broken!
    As others have said it'll be a dodgy earth. See what happens when you put the hazards and all tother lights on, you may enjoy the effect!
    Or maybe not!
    Water in the lights holder is likely to have caused it so check to see if the lenses is chipped or cracked!
    Best of luck!
     
  9. Stanleysteamer

    Stanleysteamer Well-Known Member

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    Oh and best of luck getting the screws undone!
     
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  10. berg450

    berg450 Active Member

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    The bulb has already changed to a new one, no effect. Behind the lamp body everything seems OK, not moisture, corrosion, but will double check tonight and clean all connections, bulb holders....
     
  11. sierrafery

    sierrafery Well-Known Member

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    yes, watch the metal plates inside which are going into the pins cos when you push the connector the plate might be dislodged and pushed up so the pind dont make good contact anymore
     
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  12. Stanleysteamer

    Stanleysteamer Well-Known Member

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    Ministry of Cr@p Design again!
     
  13. Stanleysteamer

    Stanleysteamer Well-Known Member

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    Bad enough so it makes the light light with no rear lights on but not when the rear lights are on?
    Weird!
     
  14. mystery

    mystery Well-Known Member

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  15. berg450

    berg450 Active Member

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    Update! Problem has solved. It was the bulb holder which had a connection issue (small copper piece marked on the side of the holder). I had to slightly lift it in order to have better contact with the side of the bulb. Thanks for the suggestions!
    upload_2020-9-28_11-33-32.png
     
  16. Stanleysteamer

    Stanleysteamer Well-Known Member

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    Well done for solving it, mate.
    Thought it would be something simple.
    And, with all due respect, it is easy to miss a contact that small when you are concentrating on the ones at the bottom of the holder. It does look as if a good clean up wouldn't do it any harm, but loss of springiness obviously looks like the main part of the problem.
    Result!:D:D:D
     
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