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Lighting problem

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Aron, Jan 8, 2018.

Page 1 of 2
  1. Jan 8, 2018 #1
    Aron

    Aron Bobtail Member

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    Nov 13, 2016
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    i have a different 1999 w900 l that recently started flashing trailer clearance lights on and off. Light would go dim and then kick out as do the dash lights have checked all grounds I can think of still nothing anything helps thanks!
     
    Aron, Jan 8, 2018
    Aron, Jan 8, 2018
    #1
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  3. Jan 8, 2018 #2
    BoxCarKidd

    BoxCarKidd Road Train Member

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    Aug 26, 2014
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    Do they still have the electrical panel in front of the clutch pedal? Change the relay and breaker for that, look at the connections for them. Where ever they are. If that does not fix it you will have some spares.
     
    BoxCarKidd, Jan 8, 2018
    BoxCarKidd, Jan 8, 2018
    #2
  4. Jan 8, 2018 #3
    Aron

    Aron Bobtail Member

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    Nov 13, 2016
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    Changed them didn’t help but I did find out my cab and sleeper top lights won’t come on unless a trailer is plugged in
     
    Aron, Jan 8, 2018
    Aron, Jan 8, 2018
    #3
  5. Jan 8, 2018 #4
    bowhunter67

    bowhunter67 Light Load Member

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    May 28, 2016
    rush city mn
    0
    check your pigtail both ends 1 side might be grounding out mine had water on the truck side in plug caused lights to do funny things
     
    bowhunter67, Jan 8, 2018
    bowhunter67, Jan 8, 2018
    #4
  7. Jan 8, 2018 #5
    Oldironfan

    Oldironfan Road Train Member

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    I agree with the pigtail socket. Cab socket usually is the culprit. I had this happen on a 2013 t700 and it caused the dash to go nuts with key off, and light switches off. You may have a bad interrupt switch also.
     
    Oldironfan, Jan 8, 2018
    Oldironfan, Jan 8, 2018
    #5
    bowhunter67 Thanks this.
  8. Jan 10, 2018 #6
    Aron

    Aron Bobtail Member

    33
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    Nov 13, 2016
    0
    Tried new pigtail still have problem did notice my top cab lights will no longer come on unless trailer is plugged never had that before checked as much wiring as I could trace different trailer does same thing
     
    Aron, Jan 10, 2018
    Aron, Jan 10, 2018
    #6
  9. Jan 10, 2018 #7
    Oldironfan

    Oldironfan Road Train Member

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    Did you replace pigtail sockets. I had to do that on a 2013 t700 it was powering the ecm and all lights and dash would go nuts with key off.
     
    Oldironfan, Jan 10, 2018
    Oldironfan, Jan 10, 2018
    #7
  10. Jan 10, 2018 #8
    Aron

    Aron Bobtail Member

    33
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    Nov 13, 2016
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    Yes they are new on the truck now and doesn’t seem to matter on trailer have tried three all the same
     
    Aron, Jan 10, 2018
    Aron, Jan 10, 2018
    #8
  11. Jan 10, 2018 #9
    Oldironfan

    Oldironfan Road Train Member

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    Than you need to get the ground wires checked. Something is not grounding.
     
    Oldironfan, Jan 10, 2018
    Oldironfan, Jan 10, 2018
    #9
  12. Jan 10, 2018 #10
    Aron

    Aron Bobtail Member

    33
    16
    Nov 13, 2016
    0
    Do you or anybody know where the trailer pigtail coming forwards grounds in truck?
     
    Aron, Jan 10, 2018
    Aron, Jan 10, 2018
    #10
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