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Thread: Low battery - 6.5 - 8.5V

  1. #21
    Join Date
    Jun 2010
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    Quote Originally Posted by DiscoMick View Post
    Is the vehicle being left locked or unlocked? If it's unlocked, has it shut down or are the electronics still active, draining power? Also, wouldn't opening the door wake up the electronics which would then go through a check?
    It was left unlocked overnight as i was concerned the battery would drain beyond the point of unlocking the car, though everything was shut.

    Ive left it unlocked overnight before with no issues.

    Cheers

    Dan
    '08 D3 4.0 V6 :) - 265/65/R17 on X5 rims.
    FINN - '72 88" S3 - 2.286 petrol - yet to go on it's first adventure
    GONE '96 D1 300Tdi - 2" lift, 32" tyres, HD rear axles, lockers :(

  2. #22
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    Oct 2014
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    Quote Originally Posted by Disco-tastic View Post
    My next step is to totally disconnect the battery overnight and measure the voltage drop.
    If the battery comes up good from that, does anyone have any ideas what could be drawing the current?
    If the alternator is disconnected I still think the battery is your issue Dan.
    The normal small drain from ECU checks every few hours overnight could be causing the voltage drop you're reading if the battery is cactus.
    Remember the battery measured at very low voltage in your initial post.
    The battery taken out of vehicle without any load on it may not show symptoms.
    Perhaps a proper battery test is the go.

    Cheers,
    Scott
    D4 TDV6 MY14 with Llams, 18" Wheels & BFG KO2s, Traxide DBS, Drifta Drawers, Rhino Platform, APT Sliders & compressor plate & Mitch Hitch
    Link to my D4 Build Thread

    Ex '77 RRC 2 door. Long gone but not forgotten.

  3. #23
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    Logan
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    Doesn't leaving it unlocked mean the electronics are still active and doing periodic checks, draining power?
    2009 Defender 110 2.4. ARB bulbar, Ironman winch, Safari snorkel, Steinbauer chip, AP HD clutch, Lightforce spots, larger tank, Off Road Systems drawer, Traxide 160 controller, Tekonsha brakes, Mulgo seat runners, Uniden UHF, Nuggetstuff seat corners, breathers, Polaris GPS.

  4. #24
    Join Date
    Oct 2014
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    Quote Originally Posted by DiscoMick View Post
    Doesn't leaving it unlocked mean the electronics are still active and doing periodic checks, draining power?
    Locked or unlocked makes no difference to the periodic checks, which draw very little power anyway.
    Older models take longer to go to sleep initially after stopping when left unlocked (approx 30min versus 3min).

    Scott
    D4 TDV6 MY14 with Llams, 18" Wheels & BFG KO2s, Traxide DBS, Drifta Drawers, Rhino Platform, APT Sliders & compressor plate & Mitch Hitch
    Link to my D4 Build Thread

    Ex '77 RRC 2 door. Long gone but not forgotten.

  5. #25
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    Jan 1970
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    Queensland
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    6,866
    Hi Dan, charge everything back up and then disconnect your cranking battery’s NEGATIVE ( - ) terminal and then see if the battery’s voltage drops over night again.

  6. #26
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    Central Coast NSW
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    Quote Originally Posted by drivesafe View Post
    Hi Dan, charge everything back up and then disconnect your cranking battery’s NEGATIVE ( - ) terminal and then see if the battery’s voltage drops over night again.
    Thanks Tim. Should i disconnect the second battery before?

    Can you please explain the logic so i have a better understanding of whats going on? I'm assuming you're checking foe an earth leak or something, but I dont really know.

    Cheers. Dan
    '08 D3 4.0 V6 :) - 265/65/R17 on X5 rims.
    FINN - '72 88" S3 - 2.286 petrol - yet to go on it's first adventure
    GONE '96 D1 300Tdi - 2" lift, 32" tyres, HD rear axles, lockers :(

  7. #27
    Join Date
    Jan 2017
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    Geraldton WA
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    5,028
    If you fully charge the cranking battery then disconnect the earth lead overnight you will be able to tell if the battery is RS If the voltage has dropped overnight
    You only get one shot at life, Aim well

    2004 D2 "S" V8 auto, with a few Mods
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    2012 Navara twincab GONE

  8. #28
    Join Date
    Jun 2010
    Location
    Central Coast NSW
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    1,797
    well, I unplugged the negative terminal of the main battery (and disconnected the secondary battery). I first unplugged the battery completely and it measured 12.5V. An hour later I reattached the positive terminal at it measured 12.53V. This morning it measured 12.5V again (about 12 hrs total)

    Previous measurements were 0.3V and 0.7V loss over 17hrs, so i take this to mean the battery is not the cause of the problem (even if it may be damaged).

    My next step will be to disconnect the SC80 overnight and measure voltage drop.

    If anyone with more knowledge than me has any further opinions please let me know!

    Cheers
    Dan
    '08 D3 4.0 V6 :) - 265/65/R17 on X5 rims.
    FINN - '72 88" S3 - 2.286 petrol - yet to go on it's first adventure
    GONE '96 D1 300Tdi - 2" lift, 32" tyres, HD rear axles, lockers :(

  9. #29
    Join Date
    Jul 2009
    Location
    Hobart
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    2,540
    Hi,
    I think it is the little yellow earth wire that you need to disconnect to turn it off.
    Chers

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