Engine Compartment Fuse Boxes

Discussion in 'Electronics' started by GlenQ, Jul 20, 2011.

  1. GlenQ

    GlenQ Hardcore MB Enthusiast

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    Hi

    S500 W220

    Before I get out the DMM does anyone know if either of the two fuse boxed located under the bonnet are ONLY LIVE when the ignition switch is turned on?

    I am trying to find a fused supply for a set of DRL's that will only illuminate when the car is running.

    I know that I will have to run this supply through a relay to turn off the DRL's when the headlights are on.
     
    Last edited: Jul 20, 2011
  2. OP
    OP
    GlenQ

    GlenQ Hardcore MB Enthusiast

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    Anyone?
     
  3. Diesel Benz

    Diesel Benz Hardcore MB Enthusiast

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    Is it really necessary to have the DLRs off when ignition is on but the engine is off? It would be easy to find a 15R fused output but the "engine running" signal might need to come from a CAN BUS (like the alternator on signal).
     
  4. OP
    OP
    GlenQ

    GlenQ Hardcore MB Enthusiast

    Messages:
    203
    Joined:
    Jun 16, 2011
    Location:
    Derbyshire UK
    Car:
    2004 W220 S320 CDI
    I only need the DLR's on when the ignition is on then take that feed through a relay that is open when the headlights are on so I need a fuse that is only live when the ignition is on.

    Will taking a supply from the headlights (to energize a relay) throw up a fault with the headlight monitoring system?
     

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