KW T680 Fuse Trouble Shooting

Discussion in 'Kenworth Forum' started by moybutter, Dec 16, 2025.

  1. moybutter

    moybutter Bobtail Member

    38
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    Jul 16, 2018
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    I want to share with you all the strangest thing that just happened while troubleshooting a fuse problem. Early this morning I woke up early this morning and saw that my tablet was dead, battery drained and playing with the charging cable didn't work.
    Later on in the day my radio wouldn't turn ON so I figured that both issues were related.

    I located the 15A CB Radio fuse in the fuse box under the steering wheel. I replaced the fuse and my radio worked Yay! Then I noticed that all my lights were ON; interior, tractor, and trailer with key switch ON and all would go out when I turned if OFF. The light control buttons did not work on the center dash. My lights were working just fine prior.

    I went back into the fuse box to see if I knocked something loose or unseated any of the fuses; everything was good. The lighting issue still was there. I flipped the CB Radio fuse around and put it in the other way to see if that would make a difference it didn't. I was confused.

    Then I noticed that the MSM 5 amp fuse was in the wrong spot: A10 vs A9. I moved it to A9 and my lights worked. I never moved the fuse from the spot previously and my lights working just fine since I have been in this truck??? Strange....

    My tablet is charging but the battery has been stuck at 0% for a while. Hopefully it will charge up.
     
    Last edited: Dec 16, 2025
    Reason for edit: Accidentally submitted it
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