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rare electrical issue 11/87 M3

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  • rare electrical issue 11/87 M3

    hi good day

    car was siting for 10 years

    just finished rebuilding the engine and electrical



    now i got some strange problems


    when i turn on hazzard lights : hazzard lights + obc screen + license plate lights + parking lights , will blink together


    when i turn on lights switch without key , the radio will turn on



    main relay new
    fuel pump relay new
    evap relay old





    car is 11/87 ,

    i was checking C101 and reading about a pin 20



    where can i start looking ?


    thanks









  • #2
    I would start by revisiting every wiring harness earth point then one buy one remove each indicator bulb to see if it is related to a individual indicator.

    E30 M3 1987
    Mini Clubman GT
    BMW E36 323 Msport
    Toyota Corona
    KTM 200EXC
    Honda CB50 (1979)

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    • #3
      thanks for advise , yes this sound like a ground problem

      its posible , a bad bulb cause shorts ?

      should check every single bulb in the car ?

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      • #4
        forgot to mention when car if off the green lights on cluster still iluminated even whithout key

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        • #5
          No just the indicator (turn light) bulbs which is what works when the Hazard lights are going, that is after you investigated each earth point.

          E30 M3 1987
          Mini Clubman GT
          BMW E36 323 Msport
          Toyota Corona
          KTM 200EXC
          Honda CB50 (1979)

          Comment


          • #6
            i just take out the rear turn bulbs and it fix the obc blinking , obc works good without the turn signal bulb



            so confirmed my short should be in the turn signal wiring



            besides this , when ign swith in pos 1 , the 2 pumps are working












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            • #7
              See if you can find where the rear turn bulbs earth point is, or for a quick trial add an extra earth wire to the tail lights to see what happens.
              Just incase it is earth problem not a short circuit in the rear lights.

              E30 M3 1987
              Mini Clubman GT
              BMW E36 323 Msport
              Toyota Corona
              KTM 200EXC
              Honda CB50 (1979)

              Comment


              • #8
                UPDATE

                hi just figure it out , my problem was a G300 ground point , i forgot to put it , rear seat


                just put them and now everything is working great



                thanks for help


                erne

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