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Thread: Over voltage

  1. #1
    Join Date
    Sep 2010
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    Corpus Christi Texas USA
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    850ci, M5, Alpina B7

    Over voltage

    Trying to nail down a 14v to 16v fluctuation in system voltage. Have replaced original alt with 2 rebuilt ones. Both produced over voltage put new voltage regulator one OE alternator and seemed to work fine charging about 14.8 volts. Now it’s out of whack also. This WAS not a BMW regulator. The batteries are almost new but have been stressed running low and or flat. Now I’m thinking they maybe two years old and the car sat almost that long. Maybe I answered my question.


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  2. #2
    Join Date
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    I think you probably have - but where do you measure and with what?
    Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i


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  3. #3
    Join Date
    Sep 2010
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    850ci, M5, Alpina B7
    I have been measuring recently at the engine compartment terminals with a volt meter/circuit tester sometimes at the alternator. Suggestions?


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  4. #4
    Join Date
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    99 840ci Sport Indv
    Very likely to be failed batteries - the alternator needs a good load (the batteries) to regulate correctly.
    Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i


    My BMW Repair YouTube Channel
    My Current 840ci Sport Individual
    My Current 650ci Sport Individual
    My E31 Repair and Information Website
    My E38 Repair and Information Website
    My E63/E64 Repair and Information Website

    Chase - Heroes to a generation

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