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Does leaving the car unlocked cause battery drain?

Discussion in 'A3/S3 Forum (8L Chassis)' started by doublem_1, Mar 23, 2012.

  1. doublem_1
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    doublem_1 Member

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    [Mar 23, 2012]
    I left my car in the garage for a week whilst I was away recently and the battery was dead, its a 2 month old Bosch silver battery. The car is a 1.9tdi PD130.

    I checked with a mutliemetre and pulled out most fuses to test current flow, tried the obvious ones such as cig ligher, lights, radio etc and it wasnt showing a thing. Then I tried the engine timing fuses and both registered a reading. The ignition was off. Is this normal? As soon as I put the ignition on, the reading dropped to nothing, on both fuses (37 and 43).

    When I left the car in the garage I never bothered to lock it. I have a habit of doing this and the battery and an older battery has died on me after about 3 or 4 days whilst it was below freezing, the car was unlocked then too.

    So, does the A3 8l use more battery when its unlocked?
    #1
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  3. MURRAYS444
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    MURRAYS444 Member

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    [Mar 23, 2012]
    Don't thinks so the interior lights go off after a minute so does the date and time on the instrument cluster.
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  4. doublem_1
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    doublem_1 Member

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    [Mar 23, 2012]
    I turned the interior lights off manually, the keys were out of the ingition. But why would the engine timing circuit be using power?
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  5. jojo
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    jojo S3 Drift King! Staff Member Moderator

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    [Mar 23, 2012]
    I always leave my car unlocked in the garage for long periods, it's the way to do it, my battery goes flat over time too. Best to just disconnect the battery.
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  6. bez101
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    bez101 Yorkshire & Humber Rep. Regional Rep VCDS Map User

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    [Mar 23, 2012]
    mines never locked never had a flat batt
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  7. jojo
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    jojo S3 Drift King! Staff Member Moderator

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    [Mar 23, 2012]
    I just started mine up after 2 months parked up, all is fine.
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  8. doublem_1
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    doublem_1 Member

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    [Mar 23, 2012]
    Is it suggested then that I take it to an auto electricians? Really getting me worried, can't leave it anywhere for an extended period of time.
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  9. GISXER711
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    GISXER711 New Member

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    [Mar 23, 2012]
    maybe buy a solar charger
    small solar panel sits in car window and conect to car battery
    ebay and other shops
    #8
  10. Ads_AudiA3
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    Ads_AudiA3 Member

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    [Mar 23, 2012]
    Or use a trickle charger :icon_thumright:
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  11. feck_on_a_stick
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    feck_on_a_stick Member

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    [Mar 23, 2012]
    I wondered the same as Id left mine unlocked a few weeks back but the drivers door wasn't fully shut.

    I have the interior lights permanently off but I guess the lower door (kerb) light was still on.
    #10

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