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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

    doublem_1 Member

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    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?
     
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  3. MURRAYS444

    MURRAYS444 Member

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    Don't thinks so the interior lights go off after a minute so does the date and time on the instrument cluster.
     
  4. doublem_1

    doublem_1 Member

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    I turned the interior lights off manually, the keys were out of the ingition. But why would the engine timing circuit be using power?
     
  5. jojo

    jojo Looking for Boost!
    Staff Member Moderator quattro Audi S3

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    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.
     
  6. hades-

    hades- Yorkshire & Humber Rep.
    Regional Rep VCDS Map User

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    mines never locked never had a flat batt
     
  7. jojo

    jojo Looking for Boost!
    Staff Member Moderator quattro Audi S3

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    I just started mine up after 2 months parked up, all is fine.
     
  8. doublem_1

    doublem_1 Member

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    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.
     
  9. GISXER711

    GISXER711 New Member

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    maybe buy a solar charger
    small solar panel sits in car window and conect to car battery
    ebay and other shops
     
  10. Ads_AudiA3

    Ads_AudiA3 Member

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    Or use a trickle charger :icon_thumright:
     
  11. feck_on_a_stick

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    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.
     

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