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Thread: jump leads on fire

  
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    jump leads on fire

    Hi guys tried jump starting an mx5 the other day and as far as im aware i did everything by the book

    red from the dead battery to my positive

    black from the negative mx5 to my neg battery. tried to find somewhere on the car to earth it on the mx5 but there was nowhere.

    anyway nothing happened but a shit load of sparks and the leads actually set on fire. They were definately 100000% the right way round so whats gone wrong? no fuses have gone or anything and the mx5 did absolutely nothin!

    my car was running when i did all this should i not have had it running or something. be good to know for future reference theres no point me having jump leads if i dont know how to use them properly ha!!!

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    did you do it battery to battery?
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    yep sure did

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    Only thing I can think of is the electrodes inside the battery are short circuiting, it does happen, Take the battery out and get it tested somewhere like halfords on their Bosch 121 tester, and they'll be able to tell you for sure
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    thanks. The only reason i aks is cause the mx5 bird got her fella out and it went straight away from the sounds of it have a done anything wrong i dont waana be blowin fuses and stuff if i ever need to do it again

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    Were they thin jump leads?
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    they werent the best but they used them before and they were fine ive defo seen worse

    just been lookin on youtube and i had my car running so i can only assume that the leads should be connected in the sequence and then started. It appears the neg for the dead battery should definately be earthed on the car and not the neg terminal on the battery itself

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    nah u did everything correct mate

    battery should be running when u connect the leads so u were correct there

    ok ideally it should be black lead on engine earth but putting it on neg terminal if space is limited is still ok

    im assuming theres a serious problem in the dead battery as explained in an earlier post - best get it removed and checked or better still just replace it

    i got a nice 70 amp battery this morning from vxl on trade club for £50 so if u can get trade somewhere id recommend u do the same - ebay has some good prices too

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    Quote Originally Posted by GeordieBandit View Post

    battery should be running when u connect the leads so u were correct there
    If you mean the car with the good battery should be running when you connect them up this should NEVER be done. The voltage difference between the flat battery and running one could end up spiking a ecu and blowing it up
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    oops - maybe thats why i always use a jump pack

    gonna do some research on this andy as it would appear ive been misled some time ago

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