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Thread: Bmw e46 323i voltage output from alternator to battery low

  1. #1
    Join Date
    Nov 2018
    Location
    California
    Posts
    2
    My Cars
    Bmw e46 323i/320ci

    Bmw e46 323i voltage output from alternator to battery low

    As the title states I have a problem with the voltage that is being put out from the alternator to the battery. I already replaced both battery and alternator with new ones so now I believe I am stuck with cheching the wiring that goes from the alternator to the battery.
    Alternator does charge the battery but too slow to keep it fully charged. After about 2 hours of driving I my voltage output droped from above 14 to 11.9 at about 65mph.

    I could not find the exact locations of grounds and cables that would be important for me to check. If someone has pictures I would appreciate it!

  2. #2
    Join Date
    Jun 2002
    Location
    Aberdeen, NC (yes, again)
    Posts
    23,672
    My Cars
    E39M5, E500 4WD
    Unbolt, clean, and retighten the following:
    Both battery terminals.
    The OTHER end of the negative battery cable.
    The B+ (jump start) terminal underhood.
    The main hot bolt of the starter motor. It should have TWO big cables tightened under that one nut.
    The big wire at the alternator.
    The main engine ground cable at the passenger engine mount -- both ends.

    Chris Powell
    Racer and Instructor since, well. decades, ok?
    Master Auto Tech, owner of German Motors of Aberdeen
    BMWCCA 274412
    German Motors is hiring ! https://www.bimmerforums.com/forum/s...1#post30831471

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