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    My Battery is Dying, Right?

    I just installed a digital voltmeter and I've been monitoring some idiosyncrasies in the voltage that i think might be pointing me toward battery replacement. My data is as follows:

    Key On/ Engine not running: 12.0V
    After sitting overnight with key on/ Engine not running: 11.5V
    Engine running: 13.5-13.8V
    Whitle starter is is engaged: 10.0-11.0V
    Brake lights on (while running): 13.2V
    Last edited by ClayW; 04-09-2013, 08:35 AM.
    1987 325e Commuter Project Blog

    1967 1600 Project Blog: www.TX02.blogspot.com

    #2
    Originally posted by ClayW View Post
    I just installed a digital voltmeter and I've been monitoring some idiosyncrasies in the voltage that i think might be pointing me toward battery replacement. My data is as follows:

    Key On/ Engine not running: 12.0V
    After sitting overnight with key on/ Engine not running: 11.5V
    Engine running: 13.5-13.8V
    Whitle starter is is engaged: 10.0-11.0V
    Brake lights on (while running): 13.2V
    Wait, what? Tell me you meant key off, right?

    That is just about perfect, actually. Maybe a few tenths of a volt low, but do you have cause to worry? Has it been acting up? Starting poorly?

    Closing SOON!
    "LAST CHANCE FOR G.A.S." DEAL IS ON NOW

    Luke AT germanaudiospecialties DOT com or text 425-761-6450, or for quickest answers, call me at the shop 360-669-0398

    Thanks for 10 years of fun!

    Comment


      #3
      Seems fine to me.
      Owner - Bavarian Restoration
      BMW and European Electronics Repair and Restoration
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        #4
        Originally posted by StereoInstaller1 View Post
        Wait, what? Tell me you meant key off, right?

        That is just about perfect, actually. Maybe a few tenths of a volt low, but do you have cause to worry? Has it been acting up? Starting poorly?
        I meant that there is a 0.5V drop after sitting overnight. I turned the key on at night without starting the car and read 12.0V. I turned it off and slept. In the morning, I again turned the key on, without starting it, and read 11.5V.

        Sorry for the confusion.

        Yeah, I'me getting an occasional hard start. I'm also getting a sticky starter relay, despite the supposedly recently new starter.
        1987 325e Commuter Project Blog

        1967 1600 Project Blog: www.TX02.blogspot.com

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          #5
          Clean the orange starter relay near the steering column. Also consider upgrading your engine ground cable and possibly alternator cables. Customers have reported faster engine crank times with the set.
          Owner - Bavarian Restoration
          BMW and European Electronics Repair and Restoration
          www.BavRest.com
          My Feedback Thread
          Our Facebook!
          Follow our Instagram!

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            #6
            Originally posted by Gregs///M View Post
            Clean the orange starter relay near the steering column. Also consider upgrading your engine ground cable and possibly alternator cables. Customers have reported faster engine crank times with the set.
            Only Autos have starter relays, if you have a 5 speed, no relay.

            Closing SOON!
            "LAST CHANCE FOR G.A.S." DEAL IS ON NOW

            Luke AT germanaudiospecialties DOT com or text 425-761-6450, or for quickest answers, call me at the shop 360-669-0398

            Thanks for 10 years of fun!

            Comment

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