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Thread: flat battery

  1. #1
    Regular Member LAV6Y's Avatar
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    Default flat battery

    After recently leaving the car headlights on and letting the battery go flat(DOHHHH!!!!) i tried to get the car started on a set of jump leads, much to my amazement but the engine management light came on when the leads where connected and it refused to start on the jump. HOWEVER, when it got just a SLIGHT push she fired up and was away in no time. Any-one got any ideas why?????

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    Regular Member SirGSi's Avatar
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    Careful when bump starting a car with Catalytic convertors m8 as any unburnt fuel can end up knackering them!

    Not sure why the jump start didn't work though?

    Maybe connecting the leads charged the battery just enough to start the car?

    I'm sure someone else will be along to help!

    Grant.

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    Regular Member Green Growler's Avatar
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    Did you follow the procedure in the hand book ?
    If you connected the jump lead to the negative terminal of the flat battery you are very lucky if you didn't cause some damage.
    It has been known for voltage spikes to fry ECU's !!! (let alone exploding batteries, lol)
    The only other thing I can think of is, if you tried to turn the car with the flat battery over straight away ?
    If the battery was completely flat, it is always a good idea to give it a minute or two to take some charge on board before you try starting it.

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    Regular Member LAV6Y's Avatar
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    oooooppppppsssssss!!!! cheers green growler, sound like i have got off lightly
    still is weird but, the leads weren't connected up in any unusual way and it was left to give a boost for a minute ir two. just seemed like the car wouldn't let the battery take any charge.
    Not too worry anyway, everything is ok now!!!!!

  5. #5
    Regular Member Spikey©'s Avatar
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    Jump leads? JUMP LEADS?!? Who needs them eh? Just ask Mark and Dean......

  6. #6
    Regular Member Green Growler's Avatar
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    Those of us with auto box's, that's who, lol.

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    Regular Member Gsi3.2's Avatar
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    if you'd seen how we had to start the snot rocket on sunday you'd have run a mile....

    think long welding earth leads with only one croc clip and you get the idea..

  8. #8
    Regular Member Gsi3.2's Avatar
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    Quote Originally Posted by Green Growler View Post
    Did you follow the procedure in the hand book ?
    If you connected the jump lead to the negative terminal of the flat battery you are very lucky if you didn't cause some damage.
    It has been known for voltage spikes to fry ECU's !!! (let alone exploding batteries, lol)
    The only other thing I can think of is, if you tried to turn the car with the flat battery over straight away ?
    If the battery was completely flat, it is always a good idea to give it a minute or two to take some charge on board before you try starting it.
    ALWAYS connect the dead vehicles earth lead to the engine..never the battery as as GG said it'll fry the ecu...

    connecting to the engine will lessen the chances greatly..

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