R129 odd lighting fault- help needed with diag.

Discussion in 'Electronics' started by Burgunder, Oct 20, 2016.

  1. Burgunder

    Burgunder New Member

    Messages:
    6
    Joined:
    Oct 18, 2015
    Location:
    Yorkshire, UK
    Car:
    SL 500 1992
    Hi, 1992 sl 500. All day driving lights turn on (front side, number plate, rear side lights) when car sat unused for days or weeks. No alarm fitted, keys not in. Def not leaving switch on. Runs batt flat. Had new battery. Repaired lighting monitor module (for diff issue) still doing it, I don't think it's that module. Is there a master relay for sides/daytime. Anyone else had this fault? Cheers guys. Oh btw if I reach in and turn lights on and off they all go off. Very odd. And annoying of course. Not good for my missus love of the car, lol.
     
  2. optimusprime

    optimusprime Hardcore MB Enthusiast

    Messages:
    3,013
    Joined:
    Dec 29, 2013
    Location:
    Kidderminster Worcestershire UK
    Car:
    Mercedes W124 260E M103
    Alternator relay nees checking .You may be able to remove this from the rear of the alternator yourself .Only a few screws holding it in. When you turn key on ,do you have a red charging light on?
     

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