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Gauges backlight stopped working

Discussion in 'Ask An Owner Operator' started by Flatbedotr, Sep 30, 2023.

  1. Sep 30, 2023 #1
    Flatbedotr

    Flatbedotr Light Load Member

    98
    32
    Nov 26, 2018
    0
    Hello,
    Was wondering if anyone can help with this issue. The backlight of my dash gauges (speedometer, air brake, etc) is currently not working. Other lights (like the AC cluster, the 5th wheel slide, and the air dump) are working, however. Looked at the fuse panel diagram, and thought it was C10, but that fuse is good. Does anyone know what fuse controls the gauges backlight in a Peterbuilt 579, made in 2020? Thanks for any help!
     
    Flatbedotr, Sep 30, 2023
    Flatbedotr, Sep 30, 2023
    #1
    Flat Earth Trucker Thanks this.
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  3. Sep 30, 2023 #2
    skallagrime

    skallagrime Road Train Member

    3,784
    9,705
    Apr 10, 2012
    Indiana
    0
    While i dont know that truck, i would lean towards that gauge cluster just having a broken or loose or disconnected positive. Pretty sure if you have backlight on all the rest, it shouldnt be a fuse
     
    skallagrime, Sep 30, 2023
    skallagrime, Sep 30, 2023
    #2
    Flat Earth Trucker Thanks this.
  4. Sep 30, 2023 #3
    062

    062 Road Train Member

    6,010
    32,580
    Oct 20, 2013
    0
    It may be controlled by a module.
    You can try unhooking the batteries,then after hooking them back up do a few key cycles without starting.
    Sometimes if you don’t allow all the modules to communicate before starting the truck,then you may have problems.
    @Goodysnap
     
    062, Sep 30, 2023
    062, Sep 30, 2023
    #3
    Oxbow and Flat Earth Trucker Thank this.
  5. Sep 30, 2023 #4
    Espressolane

    Espressolane Road Train Member

    16,179
    94,653
    Nov 21, 2009
    Just south of the north 40
    0
    Both KW and Petes have this problem.
    It is not a fuse. It is a combination of the ignition switch and the body computer.
    With the truck OFF, work the ignition switch several times. Basically wiggle it. Sometimes after the ignition switch is shut off for a while, it will start working again. Sounds goofy but it is what it is.
     
    Espressolane, Sep 30, 2023
    Espressolane, Sep 30, 2023
    #4
    Vampire, Rickp and Oxbow Thank this.
  6. Oct 1, 2023 #6
    Flatbedotr

    Flatbedotr Light Load Member

    98
    32
    Nov 26, 2018
    0
    Yup yup, just needed a restart like my phone or computer and cleared it up, thanks for assist guys.
     
    Flatbedotr, Oct 1, 2023
    Flatbedotr, Oct 1, 2023
    #6
    Long FLD and Oxbow Thank this.
  7. Oct 1, 2023 #6
    Long FLD

    Long FLD Road Train Member

    10,635
    42,019
    Mar 4, 2015
    0
    Don’t turn the key and fast start it. Give it a few seconds after you turn the key to let the ABS cycle and let all the modules start booting up before you start the truck.
     
    Long FLD, Oct 1, 2023
    Long FLD, Oct 1, 2023
    #6
    Vampire and Oxbow Thank this.
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