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Thread: Battery draining issue

  1. #11
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    I had it suggested to me the alternator could be the culprit due to bad diodes. Thoughts?

    Can an Alternator Drain a Battery? | It Still Runs

  2. #12
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    Hi Ranga and if it was your alternator, your battery would most likely be flattened in a an hour or so.

    Have you disconnected the SC80 from your cranking battery?

  3. #13
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    Quote Originally Posted by drivesafe View Post
    Have you disconnected the SC80 from your cranking battery?
    No, didn't even think of that! I now understand it could be that the auxiliary is less than fully charged, and drawing from the cranker - correct? What levels/rates in the batteries does this occur?

  4. #14
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    Quote Originally Posted by Ranga View Post
    No, didn't even think of that! I now understand it could be that the auxiliary is less than fully charged, and drawing from the cranker - correct? What levels/rates in the batteries does this occur?
    Put a switch in the thin wire running to an earth lug from the SC80,makes isolating the batteries easy.

    I always charge mine separately as they seem to charge better,particularly if both are not AGM.
    Paul

    D2,D2,D2a,D4,'09 Defender 110(sons), all moved on.

    '56 S1,been in the family since...'56
    Comes out of hibernation every few months for a run

  5. #15
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    Just went and checked again, 12.69

    It has had bonnet up for few days and no doors opened and no second battery.

    I have done a couple of intermediate readings of an increase to 12.7, a drop to 12.68 and the current reading of this posting.

    The variations are probably multimeter probes resistance more than anything.

    I thought them battery monitoring/isolator thingys had mosfets in them sucking less than the batterys internal losses?

  6. #16
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    Quote Originally Posted by johnp38 View Post
    Just went and checked again, 12.69

    It has had bonnet up for few days and no doors opened and no second battery.

    I have done a couple of intermediate readings of an increase to 12.7, a drop to 12.68 and the current reading of this posting.

    The variations are probably multimeter probes resistance more than anything.
    Temperature differences is the most likely cause of voltages going up and down, but in the same area.

  7. #17
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    It gets stranger - it was down to 12.41 this morning, and wouldn't turn over. No idea why it wouldn't start at that voltage. I reluctantly de-isolated the auxiliary and it started fine. Bad earth?

  8. #18
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    Quote Originally Posted by Ranga View Post
    It gets stranger - it was down to 12.41 this morning, and wouldn't turn over. No idea why it wouldn't start at that voltage. I reluctantly de-isolated the auxiliary and it started fine. Bad earth?
    What was the voltage while cranking?

  9. #19
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    have you only got a surface charge on the battery Ryan try putting say a trouble light or something with a bit of a load on battery and see if it holds voltage

    if holds -- battery ok then its terminals ,wiring etc

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