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  1. #1

    Default battery voltage reading

    2007 4x4 chevy silverado

    My battery voltage seems to run @ 13.0 volts after i have ran my truck for about 15min. When i crank it it reads 14.4 but after running it a little while it reads 13.0 volts and sometimes when i am running it under 45 mph it will go back up to 14.4 then shortly after run back down to 13.0. i changed the battery and alternator and still doing the same the thing. what could be causing this??

  2. #2
    Jr. Mechanic
    Join Date
    Dec 2008
    Location
    Gettysburg, Pa.
    Posts
    103

    Default battery voltage

    Sounds perfectly normal to me.

  3. #3

    Default

    Are you using a hand held volt meter? The volt meter in the dash is not very accurate. A fully charged battery should read 12.6 volts after the surface charge is removed by turning on the headlights for 30 seconds. To check charging voltage turn on all accessories and run the engine at 2000 RPM. Voltage should be about 13.6 to 14 volts with all the accessories on.
    Jim

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows



    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

  4. #4

    Default

    Yea what u got is perfectly normal, Voltage fluctuates a lot between 12.6 - 14.4 if it goes under 12 then that would say your alternator is gone and your running the whole truck on the battery.


    1995 Chevy Silverado
    Fully loaded!!!
    4Wheel Drive
    5.7 Liter
    Blue
    Best Engine In The World!!!!!
    Once i had a nearly dead battery and was only able to get 1 slow crank per attempt, Once to the fifth crank she fired up! (True Story)
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