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Odd electrical faults W123 230E

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by lindendeborah, Apr 14, 2010.

    :confused:

    A strange series of electrical faults have developed overnight with a number of seemingly connected things working or not working, previously everything worked perfectly

    Indicators not working
    Hazard lights working

    Rev counter not working
    speedo working

    fuel guage not working
    ecomony guage working

    Temperature guage not working
    Oil pressure guage working

    Electric windows work with the driver's door open (lower button makes the difference) but not with it closed

    All other lights etc working fine

    I have checked all the fuses and they are fine, the wiring diagram that I have is incredibly complicated and in german if only I could identify th wire(s) feeding these items I'm sure I could fix it. Any help or suggestions would be much appreciated itseems like a host of faults but how could they all develop overnight?
     
  1. Alex Crow

    Alex Crow Senior Member

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    Your Mercedes:
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    sounds like a faulty ignition switch with those faults, fits the problem perfectly. otherwise have a good look at the fuses and give them all a good twiddle - the torpedos tend to suffer poor contacts at the tips so do not assume they are ok if not blown.
     
  2. television

    television Always remembered RIP

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    Exactly as Alex,,those awful torpedo type fuse dirty, or the ignition switch
     
  3. jberks

    jberks Senior Member

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    Makes perfect sense to me - no ignition or accessory electrics (does the radio work?).
    Quite surprising that the engine runs but I assume it's feed is separated. Do your brake lights work though?

    The speedo on the 123 is mechanical so that's why thats working.
     
  4. OP
    lindendeborah

    lindendeborah Guest

    Ignition switch

    Thanks for the replies, am feeling greatly more clued up already.

    I have twiddled the fuses to no avail

    I am assuming some of the electrics think the car is switched off so don't work like the indicators etc, I am surprised the rev counter is not mechanical.

    Does anyone know of wiring diagram for the ignition switch on the net, or to buy, so I can test the switch? I have only an old american manual and the diagrams are not at all comprehensive or even off the same model.
     
  5. television

    television Always remembered RIP

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    I would get hold of a Haines book,, there is little else out there on this
     

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