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2003 w900 no trailer brake lights

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Adamali21, Dec 4, 2024.

  1. Dec 4, 2024 #1
    Adamali21

    Adamali21 Light Load Member

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    Hello I have a 2003 w900 i am having no brake lights to the trailer, I checked the trailer stop fuse and it’s not getting power. Is there something else I should check
     
    Adamali21, Dec 4, 2024
    Adamali21, Dec 4, 2024
    #1
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  3. Dec 4, 2024 #2
    MM71

    MM71 Heavy Load Member

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    Relay and fuses on firewall under hood, usually somewhere on the upper drivers side by the windshield fluid reservoir.
     
    MM71, Dec 4, 2024
    MM71, Dec 4, 2024
    #2
  4. Dec 4, 2024 #3
    Adamali21

    Adamali21 Light Load Member

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    Does an 2003 w900 have a fuse or relay on the firewall under the hood I thought only the 2000 and under did.
     
    Adamali21, Dec 4, 2024
    Adamali21, Dec 4, 2024
    #3
  5. Dec 4, 2024 #4
    D.Tibbitt

    D.Tibbitt Road Train Member

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    If you have a blown Fuse then you have a brake light wire that is shorting out somewhere.. check the wiring around your brake lights to see if there is some exposed wiring touching the frame... that is the best place to start...
    replace the fuse and see what happens
     
    D.Tibbitt, Dec 4, 2024
    D.Tibbitt, Dec 4, 2024
    #4
  7. Dec 4, 2024 #5
    Adamali21

    Adamali21 Light Load Member

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    The fuse is not blown it’s just not getting power
     
    Adamali21, Dec 4, 2024
    Adamali21, Dec 4, 2024
    #5
    D.Tibbitt Thanks this.
  8. Dec 4, 2024 #6
    D.Tibbitt

    D.Tibbitt Road Train Member

    20,161
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    Apr 26, 2013
    Gettin' down westbound
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    Ok if it doesn't have power to the fuse then check the wiring going into the fuse block itself
     
    D.Tibbitt, Dec 4, 2024
    D.Tibbitt, Dec 4, 2024
    #6
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