Interesting battery fault

Discussion in 'General chat' started by 535i MSport, Sep 14, 2021.

  1. 535i MSport
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    535i MSport WARLORD Site Supporter

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    I had an interesting fault on one of my son’s cars on Sunday. It started fine and drove fine, but when he got to work and parked he noticed he had left his window open, so turned the ignition on to close it and nothing. Tried again and had a relay constantly chattering, but nothing worked.

    After towing it home, the battery voltage was good at 12.5V when disconnected, but when reconnected - and the relay chattering - only around 9V. After reading some horror stories about French electrics (the car is a Clio) and failing power modules, the dim interior light flashing in unison with the chattering, made me suspect it had a voltage issue / dead cell which is why I measured “on load”. I then tried some jump leads from my car and it started straight away and had an alternator voltage of around 13.5V so charging fine.

    Fitted a new battery and all is good with the world!

    So after having lots of batteries over the years that aged and eventually required replacement, this was the first sudden failure that manifested itself in abysmal load regulation. Prior to this event, the battery had always cranked well and did so that very morning.


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  2. Wynne71
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    Wynne71 WARLORD Site Supporter

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    Reminds me of the good lady Mrs A’s old Clio, 54 plate. She called me to say the dashboard was like Xmas and it wouldn’t start. Jump started the car for her, for back but still wouldn’t restart. New battery and was fine, still took a good few days before all the lights went out though. Voltage sensitivity indeed.
     
  3. Alan Gunn
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    Alan Gunn

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    My daughter some years ago left home one morning to go to work.
    She started her car on this frosty morning with no problem at all.
    Stopped half a mile down the road at the paper shop but came back to her cat one minute later.
    Key in the ignition and nothing at all no lights on the dash.
    Phoned me to sort it and the battery was dead new battery and never had a problem and drove it for around 5 years after until it was sold.
     
  4. Peter
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    Peter WARLORD Site Supporter

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    I had a battery start fine in the morning, went to go home for lunch and totally dead. Local tyre/battery shop only about 200 metres from our works. A couple of minutes had the battery out, made the 200 metre dash. When they tested it, completely shot. Walked back with a new battery and home to lunch. :)

    Peter
     
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  5. 535i MSport
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    535i MSport WARLORD Site Supporter

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    Lol. Not just me then!!


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  6. slim_boy_fat
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    slim_boy_fat WARLORD

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    That seems to be the way they fail now, I had the same as @Peter.
     
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  7. Peter
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    Peter WARLORD Site Supporter

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    Pleased I've a new battery in the F11. Ten years is good going, but into risky territory. Didn't want to push the limits as in our cars voltage glitches can cause havoc. (CTEK's can only do so much. :) )

    Peter
     
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  8. 535i MSport
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    I just checked the date code on the old (original) Clio battery, Jan 2010, so it did pretty well.


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