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Have I an alternator problem ? (video)

Discussion in 'A3/S3 Forum (8L Chassis)' started by arsenal_69r, Jan 7, 2010.

  1. arsenal_69r

    arsenal_69r audi a3

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  3. arsenal_69r

    arsenal_69r audi a3

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    loads of views yet no replys? as you can tell by the video the car starts sloppy and all rev and petrol counters work up untill the heating or windows are operated
     
  4. voorhees

    voorhees Moderator
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  5. Sandip

    Sandip Well-Known Member

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    Not sure but could be a bad earth somewhere, tricky one
     
  6. arsenal_69r

    arsenal_69r audi a3

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    whats the best way to check the alternator? using a voltmeter? or the best way to see whats wrong
     
  7. Sandip

    Sandip Well-Known Member

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  8. Broken Byzan

    Broken Byzan Photographic Moderator
    Staff Member Moderator VCDS Map User Audi A4 quattro

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    check your earths

    a multimeter will show a bad alternator, measure voltage before starting and then start car, the voltage at the batt should go up to around 14 ish volts. If it does the alternator is 99% working fine.
     
  9. arsenal_69r

    arsenal_69r audi a3

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    nice one cheers bud, one more thing. do i check the wire from the alternator to the battery yer?
     
  10. arsenal_69r

    arsenal_69r audi a3

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    nice one cheers also is the earths or the alternator the most likey course of this? just so i can shorten it down and concentrate on that cheers
     
  11. Broken Byzan

    Broken Byzan Photographic Moderator
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    Check volts at the batt, however IMHO there is no way for alt output to have a bearing on this at all. It will more likely be an earth in the car, probably under the knee bolster or similar
     
  12. Sandip

    Sandip Well-Known Member

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    Think you just connect the black to earth and red to live and see what happens with the light show lol Mark's (byzan A4) more of an expert than me
     
  13. arsenal_69r

    arsenal_69r audi a3

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    how and where would i check the earth and if it is what then would i do? cheers appreciate this alot
     
  14. Sandip

    Sandip Well-Known Member

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    Agree with you chief! The dodgy earth could be under the steering wheel trim
     
  15. arsenal_69r

    arsenal_69r audi a3

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  16. arsenal_69r

    arsenal_69r audi a3

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    another quick thing. how would the earth all of a sudden become a problem?
     
  17. Sandip

    Sandip Well-Known Member

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    It's a process of elimination with electrics, when you put any heating device on your asking for alot of voltage, is the car actually going off when you put the heating on full?
     
  18. arsenal_69r

    arsenal_69r audi a3

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    well the first time it done this was when i was driving along the motorway and i pulled over and turnded the engine of and it wouldnt start again it was like a had a flat battery. but to answer your question whilst just the engine is running and the heating fully up the engine is not cutting out now just the dash goin and also the interior light flickering.
     
  19. arsenal_69r

    arsenal_69r audi a3

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    would using vag pick the problem up or?
     
  20. Sandip

    Sandip Well-Known Member

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    Its a bad earth :)
     
  21. arsenal_69r

    arsenal_69r audi a3

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    so what am i to do about the earth then? where would it be and mainly how do you fix it?
     
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  23. arsenal_69r

    arsenal_69r audi a3

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    honeslty appreciate the help bud :)
     
  24. Sandip

    Sandip Well-Known Member

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    I'm not sure which earth it'll be you need to check, just to be on the safe side, just check if your earth on the battery is secure and not loose, could be an easy fix
     
  25. arsenal_69r

    arsenal_69r audi a3

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    ill have a look at my batterys earth in the morning, so best thing probs would be to get it looked over then yer?
     
  26. arsenal_69r

    arsenal_69r audi a3

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    also what ive just thought if it was my alternator or battery the battery light would pop up on the trip computer?
     
  27. MIKE GTR

    MIKE GTR Member

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    FFS just get it tested, KWik fit will do it for free, it could be the voltage regulator within the alternator. There's no point in hunting for a bad earth that might not even be there, it could even be a dry cell in the battery
     

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