Volks AutosAH Fabrications
Results 1 to 5 of 5
  1. #1
    beanoir's Avatar
    Sharpest Tongue in the West

    Status
    Offline
    Join Date
    Jan 2007
    Location
    51 Degrees North
    Posts
    2,173

    Battery Drain on 8L S3 after new Head Unit Installed

    Ok, i've had a search but not really found too much, so thought i'd ask the question.

    Ive got a parasitic drain on my battery and this morning it was as dead as a black gospel singer with a crack addiction. Had the RAC dude out to juice it (as I couldn't get it up on the drive by pushing) and he tested the battery and the alternator and he said it's charging fine but that something is draining about 0.5amps from the battery when the ignition is off which is way too much (should be about 0.05amps).

    I've checked all the bits i've found from searching, boot light staying on, glovebox light etc etc. The only thing I can think of is the new head unit i've installed, but i've got the live feeds correct as far as I can see, so i'm kind of at a loss - unsure if the amp has any funny connections I should be aware of that might mean it's not turning off (although i've got it connected to the remote). The battery is charging overnight so I can start testing all the circuits one by one with a multimeter tomorrow.

    So if anybody has any pointers before I trial and error then i'd be grateful!

    Cheers
    Porsche Cayman S |Jeep Grand Cherokee|1988 Ford Fiesta XR2

    www.essexdriversclub.com

  2. # ADS
    ADS
    Join Date
    Always
    Location
    Global
    Posts
    Many
     
  3. #2
    1st Gear

    Status
    Offline
    Join Date
    Jul 2011
    Location
    Cornwall
    Posts
    205
    Quote Originally Posted by beanoir View Post
    The only thing I can think of is the new head unit i've installed, but i've got the live feeds correct as far as I can see, so i'm kind of at a loss -
    What stereo did you install?

    How many live feeds?

    You should only have one live feed for memory and one switched live (ignition live) which is usually fed from the fuse box.

  4. #3
    beanoir's Avatar
    Sharpest Tongue in the West

    Status
    Offline
    Join Date
    Jan 2007
    Location
    51 Degrees North
    Posts
    2,173
    I installed a Parrot Asteroid.

    Thats exactly what i've got, I ran a switched live to the fuse box and used the memory/permanent live from the existing stereo connector. The amp is using a switched live from the head unit....

    ARRGGHHH!!
    Porsche Cayman S |Jeep Grand Cherokee|1988 Ford Fiesta XR2

    www.essexdriversclub.com

  5. #4
    Moderator

    Status
    Offline
    Join Date
    Jun 2003
    Location
    World of my own
    Posts
    9,813
    Have you used an antenna amp adapter and is that wired correctly to the power antenna feed on the HU?
    If the amps are switched with the remote on then it can't be them so must be HU related.
    "How to tear apart the ties that bind, perhaps fcuk off might be too kind"
    Alex Turner

  6. #5
    beanoir's Avatar
    Sharpest Tongue in the West

    Status
    Offline
    Join Date
    Jan 2007
    Location
    51 Degrees North
    Posts
    2,173
    They were my first 2 thoughts actually Andy, and so during my spent removing all the fuese and checking current draw with a mulitmeter, I narrowed it down to the headunit, I then disconnected both the amp (pulled the multiplug to the sub box in the boot) and the aerial amp and still the HU was pulling nearly half an amp.

    So, I can only assume that there must be a fault in the HU itself, which is rare in my experience but I guess it's possible...

    I'll have to remove it all and send it back under warranty.
    Porsche Cayman S |Jeep Grand Cherokee|1988 Ford Fiesta XR2

    www.essexdriversclub.com

 

 

Similar Threads

  1. Battery drain
    By Tazzie in forum A4/A4 cabriolet/S4 forum(B6 chassis)
    Replies: 6
    Last Post: 11th July 2012, 16:22
  2. serious battery drain problem b6 01 Help
    By rob irl tdi in forum A4/A4 cabriolet/S4 forum(B6 chassis)
    Replies: 22
    Last Post: 19th January 2012, 20:36
  3. battery drain on tt
    By ty160 in forum TT/TT-S/TT-RS Forum
    Replies: 9
    Last Post: 12th September 2010, 18:56
  4. A4 Battery drain-help
    By audimike in forum Audi S4/A4/A4 Cab (B7 Chassis)
    Replies: 2
    Last Post: 23rd December 2008, 07:24
  5. Issues With Newly Installed Aftermarket Head Unit
    By AA3 in forum A3/S3/Sportback (8P Chassis)
    Replies: 2
    Last Post: 18th September 2008, 01:01

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Single Sign On provided by vBSSO

Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.

Content Relevant URLs by vBSEO