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New Battery wont hold charge

twist123 Oct 24, 2011

  1. twist123

    twist123 Member

    Hi All,

    A4 B6 130 wouldnt start a week ago, checked battery and it was the original Audi part, so thought its time to change.

    Bought a new Bosch S4 fitted and all was fine when I drove it daily, parked it Friday and left it till this morning (Monday) and when I started it the low battery (brake symbol) came up and it sounded sluggish when starting.

    Hoping someone can recommend me a few things to check, so far I need to:

    Check the black box on the positive terminal
    Check alternator cables arent corroded
    Check if Hazard light stays on
    Check battery voltages when running and not running

    Can you guys think of other checks I need to do?

    Thanks in advance

  2. hades-

    hades- Well-Known Member VCDS Map User

    have batt and alt checked
    could be the alt not putting enough charge in

    check brake lights aint turning on (it happens)
  3. kite

    kite Member VCDS Map User

    you could have a drain, check amp draw on bettery with everything turned off
  4. twist123

    twist123 Member

    Thanks for the responses.

    Had a garage check voltage, had 14v while running, 13 and decreasing till 12 something when turned off, so seems alternator is fine.

    He had one of those light up screwdrivers and it lit up so somethings pulling current, but he couldnt measure the drain as never had the correct meter. I tried pulling a few fuses but nothing put the light out. I wouldve thought this would be (A) because the car pulls a little current anyway or (B) I pulled the wrong fuses. Guess I need a voltmeter to find that out.

    Any other ideas guys?
    Last edited: Oct 24, 2011

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