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[Vectra B] [95-02] Fairly heavy battery drain

Discussion in 'Cavalier, Calibra, Vectra, Signum, Sintra & Insignia owners forum' started by batumi, Dec 27, 2016.

  1. batumi

    batumi Member

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    I know battery drain has been covered many times but as this is fairly heavy, I thought someone may have a clue where I can look.

    New battery drains overnight - completely dead. I have test equipment as my hobby is electronics but I'm completely new to car electrics. Battery drain is a hefty 5.8 amps or around 70 watts. Sometrhing should be getting warm but I can't find it. I had the car run through a diagnostic test by computer just before Christmas as things like that are very cheap here - engineer to your home with computer and one hour road test to keep checking battery voltage = £7 :) and the only fault found was a problem with the central locking. I think that may be a rear door lock which is non-functional but I've disconnected it in case the motor was jammed with no result. I just wondered if anyone could think of something on the car which takes around 6 amps??
     
  2. andy_v

    andy_v Well-Known Member

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    Location:
    middlesbrough
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  3. batumi

    batumi Member

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    Is that a google chrome link? I have only Firefox but the checks suggested in the "parasitic battery drain" list on google appear to be the ones I have made with no luck. This was the reason I asked if anyone could think of something which takes such a hefty current. Removing fuses has virtually no effect on drain.

    Oh and thanks for the welcome :)
     
  4. andy_v

    andy_v Well-Known Member

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    yes g/c, should be same links what ever browser you use, been a hell of a long time since i did one,
     
  5. Pedrosquires

    Pedrosquires Well-Known Member

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    Have you had a good look at the alternator?
     
  6. batumi

    batumi Member

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    Alternator has been out and tested. Also computer diagnostic test said no fault with charging system, charge relay etc
     
  7. MikeSW17

    MikeSW17 Well-Known Member

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    Hi. While you're watching the current drawn, pull and replace fuses (engine box, passenger box, rear box) until you find which is carrying all that current away. The 'larger' fuses probably feed sub-system fuses so don't stop testing as soon as you find one culprit.
    From the fuse location and number it should be easy to identity the circuit involved.
     
    loffty01 likes this.
  8. batumi

    batumi Member

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    Hi, Yes thanks for the input, I had said in my second post that removing fuses made virtually no difference - only a few milliamps. I'm looking for in excess of 5 amps plus.
     
  9. MikeSW17

    MikeSW17 Well-Known Member

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    Where/how are you measuring the 5amp current flow?
     
  10. MikeSW17

    MikeSW17 Well-Known Member

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    Okay, A quick look at the circuit diagrams....

    It seems the battery feeds 3 main fuses all 60A, on the circuit diagrams they are FV1, FV2 & FV3, no idea if that's what they're labelled.

    If those 3 are removed and the current drain continues, there are only two items left connected (un-fused) to the battery positive : the starter motor and the alternator.

    I'm excluding any insulation fault and short-circuit battery side of the 60A fuses or the magic smoke would be escaping in clouds.

    Assuming the drain is battery side of 60A fuses, most likely (comes to mind) is a partial break-down of the rectifier in the alternator as that's the only thing that could handle (and limit to) 5A without getting hot.

    I looked at the 2000MY circuit diagrams - if yours is a different year, let me know (and engine type & transmission type) and I'll see if there is any big difference.
     

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