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12V power socket supply

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by GordonTarling, Dec 11, 2012.

  1. GordonTarling

    GordonTarling Senior Member

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    2007 E63 AMG Estate
    For various reasons, the fact that the rear 12V power socket in my 2005 E320cdi turns off with the ignition, is a real pain, so I'd like to enable it to be live all the time. Now, I was given to understand that this may just need a fuse to be swapped to a different position, but specifics seem hard to come by - even the local MB dealers don't know! So, does anyone have a clue as to where this particular fuse may be located? Thanks!
     
  2. whitenemesis

    whitenemesis Senior Member

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    Can't see that working TBH as the circuit fed on that fuse will not have moved?
     
  3. kay187

    kay187 Active Member

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    In the fusebox under the bonnet there is a fuse for the cigarette lighter which you can move positions to allow it be on all the time or just with the ignition depending on the position. Can't remember which one it is and if just the front or rear 12v supply but will try giving you fuse position later if no-one does.
     
  4. television

    television Always remembered RIP

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    Not heard of that one, but I cannot check it out right now.

    Gordon, what do you need the socket for
     
  5. Troon

    Troon Active Senior Members

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    Your Mercedes:
    A big one
    It's fuse 54 in the engine compartment fuse box, at least on my 2006 facelift S211. It has two positions, one ignition-live, one permanent live. It's the rear of the two "double-width" fuse positions, next to relay P.
     

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  6. whitenemesis

    whitenemesis Senior Member

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    Just found it myself Mark. Everyday is a school day!!

    Can't find an equivalent for the rear socket though
     
  7. kay187

    kay187 Active Member

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    That's the one I was thinking of! I don't think you can switch it for the rear one as far as I'm aware.
     
  8. television

    television Always remembered RIP

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    It does depend on what the OP wants to use it for, it can be done but we need that answer first
     
  9. OP
    GordonTarling

    GordonTarling Senior Member

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    Malcolm - I want it so that our coolbox will still run when parked up in the summer (if we ever see another one!). There's no danger of running the battery down, as the coolbox has its own low voltage protection built in.

    Troon - thanks for that, I'll take a look tomorrow morning - it's too dark now.

    I'll check to see if moving the fuse enables the supply to the rear socket, but I rather suspect it'll have its own separate fuse. If there's no facility for an alternative fuse position, I guess I'll have to look at some DIY wiring! It does seem a little shortsighted of MB though, if they've put the facility there for just the front socket.
     
  10. television

    television Always remembered RIP

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    No fuse up front can activate the rear one, You have the rear SAM and you can take the connection from that, sadly right now I cannot give you the pin outs as I have no access to WIS right now due to computer problems.
     
  11. OP
    GordonTarling

    GordonTarling Senior Member

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    OK, thanks Malcolm, no worries. I'll get something sorted out!
     
  12. television

    television Always remembered RIP

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    You can join into the trailer coupling spot:D
     
  13. OP
    GordonTarling

    GordonTarling Senior Member

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    Good idea Malcolm, I'll check that out!
     
  14. television

    television Always remembered RIP

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    The trailer coupling does have one feed as you on a caravan to supply the constant 12v,,, I have this info but cannot get to it:(
     
  15. DIYMAN

    DIYMAN Senior Member

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    Does that mean the trailer socket could be used to connect a trickle charger overnight?
     

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