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Thread: Battery Light

  1. #1
    Join Date
    May 2015
    Location
    Cumming, GA
    Posts
    38

    Battery Light

    So the battery light came on today.
    Plugged in my scangauge and was reading 11.9 ish volts while running. Is it safe to say the alternator is bad?
    71k on it, so I'm assuming alternator/battery/etc. is all original.
    2006 330cic ZHP - Mystic Blue Metallic, AT, 72k
    2012 Mazda 3i Hatchback
    1978 Suzuki GS750E

  2. #2
    Join Date
    Nov 2012
    Location
    22841
    Posts
    9,921
    Look at the battery inside the trunk and see what the date stamped on it is. If it is really old, I would replace it either way.

    Also I would disconnect the battery and remove the voltage regulator from the back of the alternator. Inspect it and see the condition of the brushes. If they are really worn out, replace the voltage regulator.

    His - 2004 Imola Red / Alcantara 330i | 6MT | ZHP |

    Her's - 2005 Black Sapphire Metallic / Black Leather 330i | 6MT | ZHP |

  3. #3
    Join Date
    May 2015
    Location
    Cumming, GA
    Posts
    38
    From my limited knowledge, the brushes look fine.
    Not sure how to read these batteries.
    Alternator spins very smooth.

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    2006 330cic ZHP - Mystic Blue Metallic, AT, 72k
    2012 Mazda 3i Hatchback
    1978 Suzuki GS750E

  4. #4
    Join Date
    Nov 2012
    Location
    22841
    Posts
    9,921
    Is one brush shorter then the other ?

    That battery is original btw and looks to be not fully charged. If you have a volt meter measure the battery with the car off.

    Production date of your car ?

    His - 2004 Imola Red / Alcantara 330i | 6MT | ZHP |

    Her's - 2005 Black Sapphire Metallic / Black Leather 330i | 6MT | ZHP |

  5. #5
    Join Date
    May 2015
    Location
    Cumming, GA
    Posts
    38
    Put a new (reman) alternator in. Light is off, voltage at 13.9 when running now.
    Going to put a trickle charger on it and start shopping around for a battery.
    Production date of 12/05.

    However now, the airbag light is on...
    2006 330cic ZHP - Mystic Blue Metallic, AT, 72k
    2012 Mazda 3i Hatchback
    1978 Suzuki GS750E

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