129 300 sl electrical problem

Discussion in 'Electronics' started by stainless, Jun 10, 2016.

  1. stainless

    stainless New Member

    Mar 23, 2008
    Hi, trying to put a 1991 300 sl back on the road that has been stood for
    2 years.working through various electrical faults and i cannot get the rear lights
    or the brake lights to work.I have changed fuses but still nothing
    Is there a relay on this model that controls the rear lights and brake lights?
    Thanks for any help.
  2. grober

    grober MB Master

    Jun 22, 2003
    Perth, Scotland
    W204 C200CDI Estate
    Failure of both brake and side rear lights might point to rear light assembly earthing problems or bulb connection corrosion--contacts can develop a thin film of oxidation. With the brakes an obvious check would be the brakelight switch on the brake pedal assembly. Time to breakout the test meter to measure some voltages and continuity.

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