Flat battery help

Discussion in 'Tech/Mech General' started by Shuismo, Apr 12, 2016.

  1. Shuismo

    Shuismo Funster

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    The engine battery a Fiat Ducato 2800cc in a 2007 Carthago is flat, I want to jump start it but not sure whether this would damage the electronics, any help please.
     
  2. Munchie

    Munchie Funster Life Member

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    Under bonnet is a black plastic case, lift the lid and this is your + connection. Attach - to any point on engine then you can jump it off.
    Do Not attach to battery terminals!
     
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  3. Figaro

    Figaro Funster

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    Why`s that ? I thought that was the way to do it. It worked in 1979 on my mini 1000 (y)
     
  4. Munchie

    Munchie Funster Life Member

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    Modern electronics do not like it.
    Had a card blow on a jag cos apprentice did not understand the dangers.
    Cost the garage a few Bob he he!
     
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  5. Munchie

    Munchie Funster Life Member

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    That is why Fiat supply a + connection under bonnet!
     
  6. Munchie

    Munchie Funster Life Member

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    On a modern vehicle you can fry the ECU if you connect direct to battery!
     
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  7. pappajohn

    pappajohn Funster Life Member

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    the jump post under the bonnet is connected directly to the battery so if you can be bothered to access the battery then carry on....but the post is easier.
    The reasoning for the post is the battery will be inaccessible....under the cab floor or right at the back of the engine bay etc.
    If the battery is easily accessible there will be no jump post so it shoots down the 'modern vehicles dont like it' theory.
     
  8. pappajohn

    pappajohn Funster Life Member

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    You might fry the ECU if you connect jump leads with the ignition turned on....sudden volt surge....but if the ign is off its no different to having a normal fully charged battery.
     
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  9. pappajohn

    pappajohn Funster Life Member

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    No it isnt...its because the battery is inaccessible.
     
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  10. Munchie

    Munchie Funster Life Member

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    Ok
     
  11. pappajohn

    pappajohn Funster Life Member

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    Come orrrrn.....you can give a better argument than that. :D
     
  12. Munchie

    Munchie Funster Life Member

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    Nope having had a Jag ECU fried due to apprentice connecting direct to battery I will never do it!
    Cost the garage a few Bob cos they were honest.
    Just my personal experience as a modern vehicle electronics numpty.
     
  13. Figaro

    Figaro Funster

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    I can`t really see it making much difference, battery + post or remote + post, power will all go to the same place surely.
    @pappajohn convenience explanation makes more sense.
     
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  14. Gromett

    Gromett Funster

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    I think the problem is when people either connect with the key in ignition or with an engine running.
    Or disconnect with a key in the ignition or an engine running..


    This is the correct way to do it.



    Some cars specifically say do not not jump start in the manual I believe?
     
  15. MH 55 FUN

    MH 55 FUN Funster

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    Not FIAT but Ford state that the negative connection should be made to the body earth & not the negative battery post, & it's ok to connect the positive connection to the battery positive, or in FIAT / SEVAL vehicles to the positive post under the bonnet.

    My 2014 Mondeo has no access to the battery negative post.
     
  16. pappajohn

    pappajohn Funster Life Member

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    The jump post on my car is under the bonnet on the inner wing just behind the headlamp.....the battery is around 10ft behind it in the boot.
    To access the battery means removing the junk from the boot, then the stiff molded carpet liner, then the ply boot floor, then the molded plastic jack/tool tray which then exposes the spare wheel and battery.
    And that is,why there is a jump post under the bonnet.

    The ECU is under the dashboard fixed to the bulkhead/firewall.
    The jump post wire goes to the starter solenoid then back to the battery.
    So....the post is much closer to the ECU than the battery is.
     
  17. andy63

    andy63 Funster

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    If the battery posts were available can't see a problem using them directly bearing in mind points made above, and sometimes the positive post has other fused connections directly to it... If you inadvertently connected to the wrong side of the fuse while jumping you would take those fuses out possibly causing damage to that circuit. .. I think that was mentioned in another similar post recently...
    Andy.
     
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  18. TheCaller

    TheCaller Funster

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    ^^^^^^^ I think what Andy said is the reason for not trying to connect to the +ve post on a Fiat based van. Add the fact that is is safer not to be connecting just above something that is potentially explosive, plus the fact that it's just so much more convenient to use the terminal under the bonnet provided specifically for the job.
     
  19. mjltigger

    mjltigger Funster

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    My 2010 Mondeo doesn't either but there is a -ve post next to the battery case
     
  20. ambulancekidd

    ambulancekidd Funster

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    My Range Rover had points under the bonnet to connect jump leads to. The actual battery terminals had a technical explosive device which blows the battery connection in the event of an accident!

    I don't believe that jump starting if done properly should be an issue. If you can jump start a modern Range Rover a Motorhome shouldn't be too difficult.
     
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