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Thread: Battery losing charge

  1. 21st May 2010, 10:59 AM #1
    Nicky
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    Question Battery losing charge

    Hi all,
    My D2a developed M&S lights on start, restart cleared this.
    Now the battery (which is new) will go from 14.6v on shutdown, to 10.6v and dropping the next morning.
    Runs ok alternator seems to charge correctly, all lights on for 1hr. trip all ok.
    I don't know if there is a test for a dicky diode in the alternator, don't want a costly whole new one.
    Apart from a dead cell what's a probable cause and remedy?
    2003 D2a Auto TD5 good Landy gone
    2015 D4 probably the most amazing yet, why get a RR?
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  2. 21st May 2010, 11:36 AM #2
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    Scouse
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    Quote Originally Posted by Nicky View Post
    I don't know if there is a test for a dicky diode in the alternator, don't want a costly whole new one.
    How about disconnecting the alternator overnight? No drop = suspect alternator.

    Have you done a current draw check?
    Scott
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  3. 21st May 2010, 12:02 PM #3
    biggin
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    I wouldn't discount a dud (new) battery yet either, or a wiring/earthing fault, or accessory/light not switching off.
    Just thinking out loud here.
    Good luck.
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  4. 21st May 2010, 12:11 PM #4
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    drivesafe
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    Hi Nicky and as above, but does your battery voltage drop below 10.6v or just down to 10.6v.

    If it doesn’t drop any further than that, it would sound like you have dropped a cell in the battery.

    For Land Rover Specific Dual Battery Systems and Headlight Wiring Upgrade Kits,
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  5. 21st May 2010, 02:24 PM #5
    Nicky
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    Thanks Guys,
    Stealer said it was a short in the fuse-box, making the ignition live when the key is turned off.
    Credible? Which fuse?
    2003 D2a Auto TD5 good Landy gone
    2015 D4 probably the most amazing yet, why get a RR?
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  6. 21st May 2010, 02:38 PM #6
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    Scouse
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    Quote Originally Posted by Nicky View Post
    Thanks Guys,
    Stealer said it was a short in the fuse-box, making the ignition live when the key is turned off.
    Credible? Which fuse?
    Auth. LR dealer?
    Yes?

    It's true then .
    Scott
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  7. 21st May 2010, 02:52 PM #7
    biggin
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    Quote Originally Posted by Nicky View Post
    Thanks Guys,
    Stealer said it was a short in the fuse-box, making the ignition live when the key is turned off.
    Credible? Which fuse?
    If that's the case, it's obviously just a trickle of current that's not enough to blow a fuse, but enough to flatten the battery. It could be just a build up a muck or something.
    Dirt plus moisture will provide a path to earth.
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  8. 21st May 2010, 04:43 PM #8
    Nicky
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    Question

    Quote Originally Posted by Scouse View Post
    Auth. LR dealer?
    Yes?
    It's true then .
    They said fuse 20, and as it's a printed circuit, the fuse-box has to be replaced??. Waiting on part.
    I can disconnect the battery overnight, a p... in the ..., but surely pulling fuse 20 is quicker and cleaner, as a temporary repair.
    Any thoughts?
    Thanks
    2003 D2a Auto TD5 good Landy gone
    2015 D4 probably the most amazing yet, why get a RR?
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  9. 22nd May 2010, 08:15 PM #9
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    Scouse
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    It might be the feed side of the fuse where the problem is. If so, removing the fuse will have no effect.
    Scott
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  10. 24th May 2010, 09:15 PM #10
    nathand
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    battery

    have you checked the water in you batt fair bit of heat in there, had th same prob with my second batt just ran dry an ****d th plates thats why it wouldnt hold charge on u, but will charge fine just not hold it
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