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T680 marker lights interrupter inoperable

Discussion in 'Experienced Truckers' Advice' started by Cowboy2, Apr 11, 2022.

  1. Apr 11, 2022 #1
    Cowboy2

    Cowboy2 Bobtail Member

    9
    1
    Apr 11, 2022
    Texas
    0
    Good afternoon,
    I am hoping someone can help. The button on the turn signal, to flash your taillights as a thank you and when my headlights are off you can typically flash your high beams does not work as well. I also noticed the two front marker lights on the trailer do not work. This has been on 3 trailers, so assume it is something with the truck. I checked all 3 fuse boxes and pulled anything marked lights and they are all fine. I suspect a possible relay. Any thoughts or suggestions would be appreciated.
     
    Cowboy2, Apr 11, 2022
    Cowboy2, Apr 11, 2022
    #1
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  3. Apr 11, 2022 #2
    Magoo1968

    Magoo1968 Road Train Member

    2,028
    5,418
    Mar 18, 2021
    St Malo mb
    0
    Light cord plug is what I would check first . Normally I have a old spare that works so I use that to check.
     
    Magoo1968, Apr 11, 2022
    Magoo1968, Apr 11, 2022
    #2
  4. Apr 11, 2022 #3
    Cowboy2

    Cowboy2 Bobtail Member

    9
    1
    Apr 11, 2022
    Texas
    0
    Thank you. I tried cleaning the light cord inserts with a brush. I’ll try another cable as well. I appreciate your advice
     
    Cowboy2, Apr 11, 2022
    Cowboy2, Apr 11, 2022
    #3
  5. Apr 11, 2022 #4
    mustang190

    mustang190 Road Train Member

    2,831
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    Jan 18, 2011
    Florida Panhandle
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    T680’s have a ton of electrical problems.
     
    mustang190, Apr 11, 2022
    mustang190, Apr 11, 2022
    #4
  7. Apr 13, 2022 #5
    Oxbow

    Oxbow Road Train Member

    12,672
    130,714
    Nov 24, 2015
    Idaho
    0
    It kind of sounds like your switch for either the black or brown wire isn't turned on (clps-marker lights) if you have pulled multiple trailers and some of the marker lights aren't lighting up, but I have never been in a T680 so I don't have any idea of your switches.
     
    Oxbow, Apr 13, 2022
    Oxbow, Apr 13, 2022
    #5
  8. Apr 13, 2022 #6
    Cowboy2

    Cowboy2 Bobtail Member

    9
    1
    Apr 11, 2022
    Texas
    0
    Thank you for your reply. Yes I have 3 light rocker switches and all are on. Next time I get it services I’ll see if the shop can figure it out.
     
    Cowboy2, Apr 13, 2022
    Cowboy2, Apr 13, 2022
    #6
    Oxbow Thanks this.
  9. Apr 15, 2022 #7
    striker

    striker Road Train Member

    6,026
    6,442
    Aug 8, 2009
    Denver, Co
    0
    If it weren't for constant electrical issues, my T680 wouldn't have issues, I swear these trucks were wired by 3 yr olds and the numnuts at KW aren't any better when it comes to fixing the stuff
     
    striker, Apr 15, 2022
    striker, Apr 15, 2022
    #7
  10. Apr 17, 2024 #8
    Mr.Stingray

    Mr.Stingray Bobtail Member

    3
    0
    Apr 17, 2024
    0
    It can be the subframe harness
     
    Mr.Stingray, Apr 17, 2024
    Mr.Stingray, Apr 17, 2024
    #8
  11. Apr 17, 2024 #9
    snowwy

    snowwy Road Train Member

    20,531
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    Since ALL the lights blink..the problem won't be the trailer.

    And it's not confined to the 680. I had the problem in a w900.
     
    snowwy, Apr 17, 2024
    snowwy, Apr 17, 2024
    #9
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