Another which wire thread. This time light switches!

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  • JamesE30
    R3VLimited
    • Feb 2007
    • 2092

    #1

    Another which wire thread. This time light switches!

    Ok i'm putting in some new light switches.
    The front and rear fogs were easy,
    but the headlights have this pull/twist knob thing.

    the back of this "knob" has 10 wires coming out of it,
    -grey/white
    -grey/black
    -green/yellow
    -grey/blue
    -brown/black
    -brown
    -grey/yellow
    -grey/green
    -brown/white
    -grey/red

    what are each of these wires?

    i wish to have an on/off switch for park lights
    an on/off switch for head lights
    and the dash lights allways on full brightness

    can anybody help me?

    THANKS
    James
    Last edited by JamesE30; 02-22-2007, 10:23 PM.

    R.H.D
    M-technic I club
  • AndrewBird
    The Mad Scientist
    • Oct 2003
    • 11892

    #2
    Here is what I found:

    -grey/white - RH Tail lights, Front RH rear turn/park and Front RH side marker
    -grey/black - Power from fuse #22
    -green/yellow - to foglight switch?
    -grey/blue - ?
    -brown/black - ?
    -brown - Ground
    -grey/yellow - LH Tail lights, Front LH rear turn/park and front LH side marker
    -grey/green - Power from fuse #23
    -brown/white - ?
    -grey/red - Dash lights, switch lights, rear side markers, license plate lamps

    Hope that helps.

    If I was you, I would determine (with a test light) which wires become hot when the headlights are on and and when the parking lights are on and then just use a switch to give power to these wires. Also figure out which wires are hot (should be grey/black and grey/green) and use those for power. Simple as that.

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    • jht3
      Wrencher
      • Feb 2004
      • 288

      #3
      connect the brown/white wire to ground (brown) to full illumination on the dash lights
      James
      '88 M3

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