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  1. #1
    Join Date
    Dec 2019
    Location
    Kansas City, MO
    Posts
    2

    Default New Voltage Regulator Issues

    I have a 2007 XC70, I was getting a charging system warning and battery light on long road trips, and the car was getting hard to start after a few short trips. So I replaced the battery and voltage regulator with part number Bosch F00MA45212. Now I get the charging system error and battery light about 10-15 seconds after starting the car. When I check the voltage there is no charge occurring from the alternator. Today the battery was down to 11.65 volts even with the car running. After checking the regulator there doesnt seem to be much I could have done wrong. Anything else to look at other than maybe a bad/wrong part?

  2. #2
    Join Date
    Feb 2010
    Location
    Virginia Beach
    Posts
    3,854

    Default

    Bad part.

    Or.

    Wrong part. Brushes and/or rectifier might have been the problem.
    Current Fleet:
    2016 Tundra Crewmax 4WD 1794
    2005 MB S600 (100K, Michelin AS3+, M1 0W40)
    2002 V70-XC (238K, Castrol Edge 0W40)
    2002 V70-T5 (195K, IPD bars, Bilsteins)
    2001 V70-T5 (76K)
    1932 Packard Sedan (straight 8, dual sidemounts, original paint and interior, Shell Rotella 15W40)

  3. #3
    Join Date
    Dec 2009
    Location
    GA
    Posts
    1,324

    Default

    Quote Originally Posted by Brillokc View Post
    Anything else to look at
    Alternators can fail in many ways other than just the voltage regulator/brushbox.

    I'd say you need a new alternator - or someone that can fix yours. (as long as you installed the regulator properly)

  4. #4
    Join Date
    Dec 2019
    Location
    Kansas City, MO
    Posts
    2

    Default

    Thanks, I think I'll order another regulator for it, to be sure its just not a bad part. Then take it in somewhere.

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