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Thread: Battery drain, cannot find cause

  1. #1
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    Battery drain, cannot find cause

    Hi, any idea please?

    My Golf mk4 1.6 has a constant battery drain of 0.42 amps (5 watts) on the main interior supply from the battery. This is constant despite pulling every fuse in turn except certain ones where it bizarrely increases to 0.72 amps. Removing relays also has no effect.
    I admit that the drivers door lock module microswitch has gone so fuse 14 is out all of the time when testing or else the alarm goes off.
    Does any one know please if there are any un fused circuits or have any other ideas please? Any thoughts would be greatly appreciated as I have to continually disconnect the battery at the moment and am totally stumped.

  2. #2
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    Interior lights?

    John
    2005 Polo 9N3 1.4S 16v, Petrol, BKY engine, GRZ gearbox, 5 Speed

  3. #3
    Administrator Keithuk's Avatar
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    First posts normally go in introductions else you could get a free fix and we never see you again!!!

    Your car spec says 0, only what I've added from this post.

    How are you checking for this current draw?
    2010 Golf GTD (170) CBBB, 5 Door, Shadow Blue (P6/D5Q), Transmission Code: KXZ, Flat Tyre Indicator, Basic Protection Pack + VCDS.


  4. #4
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    Logical thought as it's about a 5w drain but all are off. Thanks for the suggestion.

  5. #5
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    My apologies for the incorrect posting.
    With a multimeter set a 10amps. Initially on the negative side of the battery. Then on the positive side to rule out the alternator regulator and the other battery fused circuits. Hence I know it the main feed to the interior that is drawing the current.

  6. #6
    Administrator Keithuk's Avatar
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    I asked you, How are you checking for this current draw?

    With an ammeter in series or a good clamp meter?

    You generally fit an ammeter and remove each fuse and note if the current draw drops, then you know which circuit that controls.
    2010 Golf GTD (170) CBBB, 5 Door, Shadow Blue (P6/D5Q), Transmission Code: KXZ, Flat Tyre Indicator, Basic Protection Pack + VCDS.


  7. #7
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    Multimeter on amps in series. I have pulled each fuse in turn on the side of the dash and those on the relay plate under it. Current draw doesn't drop to zero, are there any I've missed?

  8. #8
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    Radio? keeping the memory alive?

    John
    2005 Polo 9N3 1.4S 16v, Petrol, BKY engine, GRZ gearbox, 5 Speed

  9. #9
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    Battery is flat in under 24 hours so not the radio but I did try disconnecting it once before.
    Thanks anyway

  10. #10
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    I take it you don't have a workshop manual with wiring diagram?
    I don't as I have a 9N3 , but it would help..

    John
    2005 Polo 9N3 1.4S 16v, Petrol, BKY engine, GRZ gearbox, 5 Speed

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