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Thread: Alternators

  1. #1
    Join Date
    Mar 2005
    Location
    Barrie Ontario, Canada
    Posts
    437

    Default Alternators

    I need a new alternator as far as i know, Everytime i leave a light on or car door open the battery just drains like a mother ****a. any ideas? is it just the battery or is the alternator a problem as well??



    J.McWatters

  2. #2
    Join Date
    Oct 2005
    Location
    Roswell New Mexico
    Posts
    288

    Default

    i know that my car uses a battery ever two years.

    Maybe you should take it to autozone and have them test it????

    bilstin HDs, eiback prokit, K&N instert, DEPO fogs, sound system, zimmerman rotors, metal master

  3. #3
    Join Date
    Mar 2005
    Location
    Barrie Ontario, Canada
    Posts
    437

    Default

    hmm good idea.



    J.McWatters

  4. #4
    Join Date
    Jun 2005
    Location
    Cleveland, OH
    Posts
    1,279

    Default

    FWIW... autozone isn't the end all of battery testing....

    I have had batteries that tested good at autozone... that wheren't worth the metal in them....
    If it cannot be fixed by the dremel or ducktape.. get out the sledge...
    --------------------------------------------------------------------
    I miss my e34

  5. #5
    Join Date
    Jan 2004
    Posts
    1,342

    Default Unlock your OBC and test voltage at ...

    different situations (Shogun has written extensively about the matter).

    If voltage test OK, guess you problem is the battery, as it is not holding/receiving charge. If voltages are low, then it is possible you have a weak regulator in the alternator.

    Javier

  6. #6
    Join Date
    Dec 2003
    Location
    Eastern Tennessee USi
    Posts
    14,694

    Default

    exactly, i guess worn out battery if the lights are bright when the car is running.
    95 E34 530I V2.31
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  7. #7
    Join Date
    Mar 2005
    Location
    Barrie Ontario, Canada
    Posts
    437

    Default

    well yea we charged it. then drove it then when i turned it off it wouldnt start again. so had to boost it. lights are all fine as usual. it just dies immediately



    J.McWatters

  8. #8
    Join Date
    Mar 2004
    Location
    Brisbane, Australia
    Posts
    418

    Default

    get a voltmeter and check the voltage at the battery when the car is running and also at the alternator. put on your lights and wipers etc and see how much the voltage drops, if any. if it stays consistent then your alternator is fine. should be around 13.8 volts

  9. #9
    Join Date
    Jan 2004
    Posts
    1,342

    Default The OBC is a handy voltmeter if you unlock ...

    Hidden Functions. Test 9 is a voltage reading at + post in engine compartment.

    Javier

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