Thread: Brand new battery not charging past 13.3V, bad alternator?

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  1. #1 Re: Brand new battery not charging past 13.3V, bad alternator? 
    Killa Bee Scottydoggs's Avatar
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    what are you testing the charging voltage with? 13 v is still charging. turn the head lights on, see how much it drops if at all. my cars always mid 13's.

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  2. #2 Re: Brand new battery not charging past 13.3V, bad alternator? 
    GTX Level Member industrialfish's Avatar
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    DIC, Aeroforce, and multimeter all read within .1V

    The 04+ have some funny deal going on where the alternator only charges based on total current draw or something, and 15V is perfectly normally during charging.

    With the headlights, heated seats, and bass on, it'll drop into the 12s with the brand new battery but never higher than mid 13s, typically 13.3.

    Trying to see if anyone knows of any typical issues like maybe bad alternator ground or something.
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