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  • battery dies Alternator?

    Recently my battery has been going flat despite long charging. I can jump start no problem.
    The voltage when idle is around 12.80, when engine running is 14.4 so I would have guessed the alternator is doing something?

    Took the car to Supercheap for a test and they say its in great condition. Left it for around 48 hours over the weekend and its dead again.

    Any ideas?

    Thanks

  • #2
    Check for a parasitic drain on your battery. Done any electrical work lately?
    amts
    Ninja Poster.
    Last edited by amts; 23-01-2017, 11:14 PM.

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    • #3
      No not changed a thing, only some things (USB) would be plugged in the 12v cig points. The radio is off, even don't have the bluetooth odb2 transimtter plugged in. Anyway to test or Auto electrician time?

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      • #4
        First noticed a problem last week driving back from a long journey in the heatwave with the aircon blasting, pressing the brake temporarily cut out the aircon, (possibly all electrics), soon after that the battery started dying.

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        • #5
          Sounds like a dropped cell but apparently tested ok. Need to get voltage readings after the car has rested a few hours.

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          • #6
            How long does it take to go flat?If it is only a day or so then recharge then disconnect the battery recharge it and see if it then hold a chargeif it does then measure the current being drawn from the battery with every thing turned off it should onlybe a few milliamps, if it is higher you have a parasitic drain issue as mentioned above.If that is the case you'll need to remove each and every fuse one at a time to see what circuit/s are drawing the current,don't forget the alternator fusible link as the fault could be in the alternator but do it last as you'll probably have to removelift the fuse box to get it out.
            HKB Electronics, manufacturer of the Alternator Voltage Booster, Silver 2008 D4D,Lifted,Underbody protection, Alternator Voltage Booster, Tiger Z winch, Lightforce DL, Air Horns, Tanami Drawers, Drop down fridge slide, Outback cargo barriers, Rotronics dual Battery system, Polaris GPS, HF/UHF/VHF, Radio speaker combiner, Long ranger water tank, Diff breathers, Inverter, Snorkel and others

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            • #7
              How long does it take to go flat?

              If it is only a day or so then disconnect the battery recharge it and see if it then holds a charge, if it does then measure the current being drawn from the battery with every thing turned off it should only be a few milliamps, if it is much higher you have a parasitic drain issue as mentioned above.

              If that is the case you'll need to remove each and every fuse one at a time to see what circuit/s are drawing the current, don't forget the alternator fusible link as the fault could be in the alternator, do that one last as you'll probably have to remove lift the fuse box to get it out.
              HKB Electronics, manufacturer of the Alternator Voltage Booster, Silver 2008 D4D,Lifted,Underbody protection, Alternator Voltage Booster, Tiger Z winch, Lightforce DL, Air Horns, Tanami Drawers, Drop down fridge slide, Outback cargo barriers, Rotronics dual Battery system, Polaris GPS, HF/UHF/VHF, Radio speaker combiner, Long ranger water tank, Diff breathers, Inverter, Snorkel and others

              Comment

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