Tail light and dash light problems

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  • Liffa
    Noobie
    • May 2025
    • 14

    #1

    Tail light and dash light problems

    I have been trying to trouble shoot some electrical problems but I cant figure out what is wrong. The car is a 1983 e30 coupe. I have not installed any front headlights yet, but something is going on in the rear.

    When the light switch is in position 0, fully pressed in, no lights are on. This I understand is correct.
    When the light switch is in position 1, parking mode, left and right taillights come on, the dashlight/cluster illumination comes on and can be dimmed.
    When the light switch is in position 2, ON position, only my left tail light works and the dashlight turns off.

    What could be going on here? Do I have a short somewhere? I dont get 12V out from the switch to my left tail light in position 2 (pin 1 of the light switch connector) I have tried another light switch with the same outcome.

    Brake lights and number plate illumination works as it should btw.
  • tomstin
    E30 Addict
    • Mar 2015
    • 564

    #2
    You need to get a wiring diagram for your year. On my 85 the wiring diagrams show a "rear lights check relay" that appears to only affect the tail lights and not the side markers?????
    2004 525i Manual - 1985 325E Coupe Manual

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