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Thread: 02 330i alternator or...?

  1. #1
    Join Date
    Mar 2018
    Location
    Toronto
    Posts
    1
    My Cars
    e46 330i

    02 330i alternator or...?

    Hey guys, need some help from you. Since I don’t know if my alternator or the cables are bad.
    Backstory: while driving the battery icon came up and basically my car went into “safe mode”, all electronics died aka wipers, radio, steering etc.
    Tried to charge the battery to full, put it back in - car didn’t start.

    Bought a new battery - car started perfectly. I did the alternator test on my dash (test 19/9) While driving the numbers were 14.3 - 14.5 did about 20km and the battery icon on the cluster came on again showing me 12.0, though the electronics didn’t die (I assume yet because the 12 is basically fully charged battery?).
    Now my question is: is it the alternator or something else is messing up?
    Thank you for the advice in advance 😊

  2. #2
    Join Date
    Mar 2015
    Location
    west chicago il
    Posts
    509
    My Cars
    01 E46 330i 5sp man spor
    Replace the alternator.

    Sent from my SAMSUNG-SM-G870A using Tapatalk

  3. #3
    Join Date
    Feb 2010
    Location
    Newburyport ma
    Posts
    2,108
    My Cars
    88,m5 95 740 04 XI E90
    Yep they come and go. You can try a new voltage regulator if you want to save a little money.

  4. #4
    Join Date
    Jul 2011
    Location
    Arlington, VA
    Posts
    9,933
    My Cars
    2018 BMW M240i
    Be advised that bmw sourced alternators from Bosch and Valeo. They are not interchangeable. Remove the air cleaner box and the upper hose. Use a mirror and a flashlight yo read the label at the back of the alternator. Hopefully it’s a Bosch. If it is a Bosch, buy a rebuilt alter that’s in a black Bosch box. Easy swap.

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