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battery connected wrong

Discussion in 'Engine' started by dax121, Mar 14, 2012.

  1. dax121

    dax121 New Member

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    hi guys
    not sure if this is in the right section but the battery on my 98 clk was connected to the wrong terminals. no lights on dash now etc so im wondering what damage was likely done. im hopeing i just blew the relay in the booth but want to know what to check when i go at it
     
  2. panason1c

    panason1c Hardcore MB Enthusiast

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    I would check ALL fusebox fuses first, you might be lucky, otherwise, you may have caused major damage to any ecu's.....just hope its only a fuse issue.
     
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  3. andy27168

    andy27168 Hardcore MB Enthusiast

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    Remember to check the fuses in the ECU box, which is on the opposite side of the engine bay to the main fuse box, but can,t help but think you have caused some major component damage.
     
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  4. neilrr

    neilrr Hardcore MB Enthusiast

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    Don't these cars have some sort of OVP?
     
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  5. jaymanek

    jaymanek Authorised Forum Sponsor Authorised Forum Sponsor

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    IF its fine and everything works then dont worry.
     
  6. panason1c

    panason1c Hardcore MB Enthusiast

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    err........but its not!


    no lights on dash now etc so im wondering what damage was likely done
     
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  7. OP
    OP
    dax121

    dax121 New Member

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    all fuses are ok but i dont know about relays have no way to check. would the relay in the booth not have blown? i would imagine that would blow before ecu or should i say hope it would blow :doh:
     
  8. panason1c

    panason1c Hardcore MB Enthusiast

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    Is there a relay with a fuse above (it might have a cover over it) alongside or close to the battery?, this is the ovp relay, check the fuse and the relay.
     
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  9. jaymanek

    jaymanek Authorised Forum Sponsor Authorised Forum Sponsor

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    ahh sorry i read that as there are no warning lamps on the dash...

    Some models have a battery protection relay and/or massive fuse... Easy to spot.
     
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  10. OP
    OP
    dax121

    dax121 New Member

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    yes it does have a relay in the booth. i went to a auto factors butt they dont have one. ill try get to main dealers and buy one. hopefully it does the job :dk:
     
  11. martyz

    martyz Hardcore MB Enthusiast

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    You could buy relays all day long and get nowhere ,check battery protection fuse first,if ok
    you will have to fault find with meter and good circuit diagram,assuming you have electrical
    experience,failing that contact an auto electrician.How did the battery end up reversed?
     
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  12. andy27168

    andy27168 Hardcore MB Enthusiast

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    Have you checked the fuses in the ECU box under the bonnet, not the fuse box.
     
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  13. OP
    OP
    dax121

    dax121 New Member

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    ive checked all fuses they are fine. and the relay that i taught would be for the battery seems to be for the fuel pump. part number A0025421319 V23134-B52-X336.
     
  14. DRBC43AMG

    DRBC43AMG Hardcore MB Enthusiast

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    Something stupid perhaps, but have you checked the battery has available juice ?
     
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  15. Black c320

    Black c320 Active Member

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    How or why was the battery connected in reverse,and whilst it was connected at what point did you realise and connect correctly,

    The amount of damage could depend on how long it was incorrectly connected.

    Are any systems working i.e lights, starter, accessories etc.
     
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  16. OP
    OP
    dax121

    dax121 New Member

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    it was late at nite when i went to move the car. its not being used so i take out the battery. i picked up the jeep battery i had their and put that into it. not looking at what i was doing when it was dark and connected it wrong. it gave out a loud spark so i disconnected it straight away. but when got the right batt their is no lights or even the steering lock wont turn off
     
  17. sinewave

    sinewave Hardcore MB Enthusiast

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    Well at least you didn't try and start it! :eek:

    That could well have fecked the Alternator! :doh:

    A quick blast with a reverse polarity should only have activated a safety device. :rolleyes:

    Cheapest option would be to call the AA/RAC etc if ya in them and have Home Start.

    Tell em you're a **** when he gets there, make him a brew and you should get it fixed or at least a free diagnosis. :thumb:
     
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  18. OP
    OP
    dax121

    dax121 New Member

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    id say it blew something because when i put in the right battery their was no power reaching the dash or ecu. so cant connect it to a laptop to see whet the fault is :wallbash:
     
  19. panason1c

    panason1c Hardcore MB Enthusiast

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    In the old 'non-electronic dependent' days, you would have got away with a reverse battery connection but in this case, there is potential for major damage to have been caused. Hope i'm wrong though.
     
  20. panason1c

    panason1c Hardcore MB Enthusiast

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