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Battery Flat

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by margan, Nov 10, 2012.

  1. margan

    margan New Member

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    Hi Guys

    I left the key in the car over night and was'nt aware the radio was on, it's now complely flat, i tryed linking jump leads up to the points the manuel shows & whilst I got some lights,etc on the dash,it would turn over, i've now charged the battery but no lights,locks,windows,etc everything is out & dead. Is their a main fuse that I might have blown?
    Its an E-class coupe 250CGI, 2009....Please help!!
     
  2. television

    television Always remembered RIP

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    Location:
    Daventry
    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    No main fuse, have you any means of measuring the voltage across the battery
     
  3. brianbrian

    brianbrian Senior Member

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    Location:
    cockney in the West Country
    Your Mercedes:
    w124 250D, SL129-deisel
    Battery knackered replace. Hope this helps
     
  4. mercmancdi

    mercmancdi Senior Member

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    Your Mercedes:
    2009 E250 cdi 08 cls320 cdi ,2007 e280 cdi '2005 E 280 CDI ,VW TOUAREG ,JAGUAR S AND xTO NAME A FEW
    I had same problem but mine was a e 280 and battery in boot but I had a main fuse behind a panel against back seat in the boot ...but television said no main fuse ,(he's much smarter than me )but make sure as most main pos cables from battery if followed can lead to a master fuse .when it went in mine it killed the whole car.
     
  5. television

    television Always remembered RIP

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    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    I am sure there is no main fuse as such,, but I could be wrong, it will be a maxi if there is in a fuse box,,, but no reason for it to blow unless leads connected reversed and battery offering no resistance at all
     
  6. LAZZA

    LAZZA New Member

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    Scotland
    Your Mercedes:
    S 500 registered October 2000
    Had this with my S500 last year. The battery needs to be connected to a charge for quite some time before it will start to actually take any charge if it has been completely discharged. If you still have no joy you need new battery. Mine was about £100 from dealer and cheaper than car accessory retailer even with my discount. (I'm in the trade).
     
  7. Steve@Avantgarde

    Steve@Avantgarde Forum Supporter Authorised Forum Supporter

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    C220CDI AMG Line Premium, SLR McLaren Roadster, SL55 & C32AMG
    I would think that the battery was so dead and the current draw was too great to crank the engine into life.

    I would never recommend jump starting a MB anyway, the way forward is to trickle charge it back to life with a 12v battery charger.
     
  8. television

    television Always remembered RIP

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    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    And disconnected to as the high voltage can damage many things as it offers no resistance when dead flat.

    Modern batteries are normally not much good if been left flat for very long
     
  9. Naraic

    Naraic Moderator

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    Your Mercedes:
    2005 CL500.
    So, let me get this straight. You post about a problem at 7:51pm on Saturday and immediately log off...and still haven't reappeared at 5:35pm the next day. So...not an urgent inquiry?
     
  10. television

    television Always remembered RIP

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    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    Its Sunday;)
     
  11. Steve@Avantgarde

    Steve@Avantgarde Forum Supporter Authorised Forum Supporter

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    Especially if he has taken refuge in a lovely warm pub!!!
     
  12. naza911

    naza911 Member

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    Your Mercedes:
    C180 Kompressor 2003 1.8
    I have just had exactly the same problem by leaving the radio back on. It will take a long time to recharge and jump starting just wont work. You will have to use a battery charger to get it back to life. 20hrs on the trickle charge should be enough.
     
  13. television

    television Always remembered RIP

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    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    A 90 amp battery takes 22 hours at a constant 4 amps
     

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