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W900 Top of cab marker lights

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by nikmirbre, Jan 5, 2021.

Page 1 of 3
  1. Jan 5, 2021 #1
    nikmirbre

    nikmirbre Road Train Member

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    I have no power to my cab marker lights up top of cab. I was gonna change the lights and I took one off and it took me a few weeks to find the correct light(ive been off 2 months). According to the fuse panel, unless they put it elsewhere, there is no fuse in the spot where it says marker lights.....I don't know where to start. How do I access the wiring under the wiring under those lights? The hole isn't but about the size of a quarter.

    Its a 2016 w900 glider.....
     
    nikmirbre, Jan 5, 2021
    nikmirbre, Jan 5, 2021
    #1
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  3. Jan 5, 2021 #2
    Inderjit

    Inderjit Heavy Load Member

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    There is a spot in the fuse box for marker lights with no fuse in it?
    If so put a fuse in that spot and see if that fixes the problem.
    I have seen fuses fall out of the terminals in KW fuse boxes.
     
    Inderjit, Jan 5, 2021
    Inderjit, Jan 5, 2021
    #2
    Bean Jr. Thanks this.
  4. Jan 6, 2021 #3
    nikmirbre

    nikmirbre Road Train Member

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    I thought the same thing but being I hadn't driven it in over 2 months I didn't think that would help. And it was working a few weeks ago when I went to take one off so I can buy a similar one.
     
    nikmirbre, Jan 6, 2021
    nikmirbre, Jan 6, 2021
    #3
  5. Jan 6, 2021 #4
    Inderjit

    Inderjit Heavy Load Member

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    Some of the new fuses the terminals where they plug in are quite a bit thinner than the older fuses.
    Makes for more incidence of fuses making poor connection falling out and burning out the fuse socket.
     
    Last edited: Jan 6, 2021
    Inderjit, Jan 6, 2021
    Inderjit, Jan 6, 2021
    #4
    nikmirbre Thanks this.
  7. Jan 6, 2021 #5
    nikmirbre

    nikmirbre Road Train Member

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    High Point NC
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    Im gonna go back to truck as it was just before dusk when I was working on it yesterday.... Ill take another look @Inderjit
     
    nikmirbre, Jan 6, 2021
    nikmirbre, Jan 6, 2021
    #5
  8. Jan 6, 2021 #6
    062

    062 Road Train Member

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    Could also be a bad switch. If you have a multimeter check for continuity.
     
    062, Jan 6, 2021
    062, Jan 6, 2021
    #6
  9. Jan 6, 2021 #7
    nikmirbre

    nikmirbre Road Train Member

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    Jul 27, 2011
    High Point NC
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    You mean the switch to turn on the marker lights?
     
    nikmirbre, Jan 6, 2021
    nikmirbre, Jan 6, 2021
    #7
  10. Jan 6, 2021 #8
    062

    062 Road Train Member

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    Yes. You’ll have to pull the dash panel back and Either back probe the plug or unplug it, then test the sockets in the switch that have wires going to them.
    Easiest way is put meter on diode symbol if you have it. If not put it on ohms looking for whatever it reads as a dead short.
     
    062, Jan 6, 2021
    062, Jan 6, 2021
    #8
    nikmirbre Thanks this.
  11. Jan 6, 2021 #9
    Inderjit

    Inderjit Heavy Load Member

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    Put the fuse in and see if the lights work before you dig any deeper.
     
    Inderjit, Jan 6, 2021
    Inderjit, Jan 6, 2021
    #9
    Perchie15 and nikmirbre Thank this.
  12. Jan 6, 2021 #10
    IH Truck Guy

    IH Truck Guy Road Train Member

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    Are you hooked to a trailer?
    Unplug the cord to isolate the truck.
    Years ago I had a trailer that had a bad wiring repair and was just a ball of green corrosion.
    Lost all marker lights on the truck.
     
    IH Truck Guy, Jan 6, 2021
    IH Truck Guy, Jan 6, 2021
    #10
    nikmirbre Thanks this.
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