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Battery problems

Discussion in 'A3/S3 Forum (8L Chassis)' started by ptr, Sep 3, 2010.

  1. ptr
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    ptr Member

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    [Sep 3, 2010]
    Before I turn the car over the battery light stays on, but as soon as I start the car it goes out. Is this normal?

    It also has problems starting if its been started in the last 30 mins or so, the starter cant seem to turn the engine over - I'm guessing the battery doesnt have enough power. I've checked with a battery tester and it shows up that the battery is good and the alternator is charging it.

    What's going on? Just need a new battery or is the alternator on the way out?

    thanks in advance for any help :happy:
    #1
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  3. Welly
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    Welly VX220 SC Driver :)

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    [Sep 3, 2010]
    Test with a multi meter across the battery terminal whilst the engine is running. You should be seeing 13.5v +.

    If not, alternator is ill.
    #2
  4. ptr
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    ptr Member

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    [Sep 4, 2010]
    Just checked and its 14.5v whilst idling, 12.6v with the engine off...

    Battery seems fine and so does the alternator, so what's going on? :think:
    #3
  5. fingermouse
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    fingermouse thats me

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    [Sep 4, 2010]
    get the battery tested properly, you need to test the battery with a load a multimeter will read over 12v even on a duff battery
    #4
  6. Welly
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    Welly VX220 SC Driver :)

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    [Sep 4, 2010]
    ^^ Agreed. Battery is most likely suspect. Charging voltage is good.
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