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Thread: Abnormal Battery Voltage With Motor Running

  1. #1
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    Abnormal Battery Voltage With Motor Running

    I measured the battery voltage as part of the process of identifying wiring to connect my additional camera. Was surprised when my multimeter read 14.84V. To confirm I then measured the voltage across the battery terminals and it was the same.

    Admittedly the meter is a brand new cheapy to replace my Fluke so there could be a calibration error however this voltage is rather high.

    Appreciate any comment as this appears abnormal.

  2. #2
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    Certainly if the battery is down a bit or you have just started I see 14.5v then after the engine has been running for a while and the battery gets a bit of charge to recover the starting loss it settles back to 13.5v and sits there.
    REMLR 243

    2007 Range Rover Sport TDV6
    1977 FC 101
    1976 Jaguar XJ12C
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  3. #3
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    what's abnormal? 14 volts is normal from the alternator to charge the battery. It'll fluctuate in these cars because of the smarts.

  4. #4
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    Hi Gravy, 14.7v is normal when first starting your motor.

    The slightly higher voltage you saw was probably because of cold ambient temperatures.

    Here in Australia, that is about as high as it gets unless in very cold areas.

    In Northern Europe, 15.5v is normal in winter months, so yours is fine.

  5. #5
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    Cold Enough

    Quote Originally Posted by drivesafe View Post
    Hi Gravy, 14.7v is normal when first starting your motor.

    The slightly higher voltage you saw was probably because of cold ambient temperatures.

    Here in Australia, that is about as high as it gets unless in very cold areas.

    In Northern Europe, 15.5v is normal in winter months, so yours is fine.
    Well the smarts on this LR is something I am going to have to get to terms with. Probably the ambient temperature would have been 10 degrees when I made these measurements.

  6. #6
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    Quote Originally Posted by Gravy View Post
    I measured the battery voltage as part of the process of identifying wiring to connect my additional camera. Was surprised when my multimeter read 14.84V. To confirm I then measured the voltage across the battery terminals and it was the same.

    Admittedly the meter is a brand new cheapy to replace my Fluke so there could be a calibration error however this voltage is rather high.

    Appreciate any comment as this appears abnormal.
    Mine runs low/middle 14's constantly.
    Jaycar sell a $20 voltage "indicator" which plugs into the cig lighter. Is surprisingly accurate.
    Before: Ser 2a LWB, Ser 3 S/W, 1979 RR 2 door, 1981 LR Stage 1 V8 (new), 1985 LR 110 V8 County (new), 2009 RRS TDV8
    Now: MY13 D4 TDV6. "E" rear diff. Cambo's magic Engine & Auto Tune. 1968 Austin 1800 Mk1 auto (my 5th)

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