E36 325 TDS Brake light strange problem (FIXED)

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  1. E36 325 TDS Brake light strange problem (FIXED) 
    #1
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    Hi, I have a problem with my brake lights on my E36. Its an ealy 1995 model, with on board computer. The computer does not show any problems (mind you I have never seen it show any problems in the 2 years I have owned it!) and there are no warning lights on the dashboard. Someone told me the other day I had a brakelight out so I went to investigate to find neither of these work.

    I have tested the bulbs by putting them into the reversing lights and they work fine. I have checked all the contacts and they also seem fine. I used an ammeter to check if there was voltage at the contacts when the brake is pressed and sure enough there is 12 volts there when the pedal is pressed however when I put a bulb in, it wont light it. Just make sure it wasn;t the bulb carrier, i connected 2 pieces of wire from the contacts to a bulb and it still didn't work!!!! Please help, I have run out of ideas, I cant understand why if there is 12volts at the contacts it wont light the bulb!!!! Any help much appreciated, I have read through previous posts whioch talk alot about the switch failure, but surely it isnt that is it if it still pushes the voltage to the contacts as it should???!!!!!!

    Please help!!! Im as a loss with it.

    Cheers
     
     

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    #2
    RYM
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    Out of interest, what reading do you get when the pedal is not pressed?

    I'm not entirely sure what happens with regards to the switch but perhaps the bulbs rely on a signal from this before they illuminate

    Sorry, i'm just guessing to try and assist with ideas as to what the failure may be?
     
     

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    #3
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    The reading when the pedal is not pressed is 0 volts which was what you would expect I guess! Really frustrating though!!!!! Does anybody think it could be the switch???
     
     

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    #4
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    Because you're getting zero volts when not pressed and 12 when it is that to me would indicate the switch is working.

    How very strange???
     
     

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    I've PM'd a man in the know, he shall receive the message as soon as he logs on to the forum
     
     

  8. Cheers RYM 
    #6
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    Thanks for PM'ing the man in the know. Much appreciated, really hope he can help!!! Thanks again
     
     

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    Sounds like you have no earth, if like you say you have power to the bulb but no bulb work then it must be a earth fault. connect a test light to the + side of the battery and get testing
     
     

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    Or the switch is braking down under load. The switch may be high resistance and a test meter is VERY high resistance so it will not drag the voltage down like a bulb will. More likely no earth tho.

    If you have no luck get a bulb, solder 2 wires to it and use that as your test meter, check live to chassis and see if it illuminates. Then check live to the bayonet earth in the lamp holder. Go from there

    HTH.
     
     

  11. Thanks 
    #9
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    Thanks for your help guys, if I get any joy I will let you know. If anybody else comes up with any ideas please let me know!!! Otherwise, its a trip to the local auto-electricians soon!!
     
     

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    #10
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    Also does it make any difference cos its an auto????
     
     

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