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2000 freightliner fld120 brake light problems

Discussion in 'Trucks [ Eighteen Wheelers ]' started by truckerbangin, Mar 13, 2014.

  1. Mar 13, 2014 #1
    truckerbangin

    truckerbangin Light Load Member

    262
    44
    Jan 22, 2013
    0
    good day guys my fld has a wiring issue when i have no tail lights or brake lights only the turn signal works. as well when i first got the truck when i pressed brakes the signal lights came on. can some one please help me out.
     
    truckerbangin, Mar 13, 2014
    truckerbangin, Mar 13, 2014
    #1
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  3. Mar 13, 2014 #2
    jameslawton

    jameslawton Light Load Member

    257
    65
    May 1, 2013
    Tulsa OK
    0
    Star with the basics chalk bulbs and fuses on the brake lights not working would guess bad brake light switch or turn signal switch can cause that as well and check the tail light wires I am sure a truck that age has been cut into a few times also check tri harness if wires loose in that brake lights can touch turn signal wires on trailer connections and cause problems
     
    jameslawton, Mar 13, 2014
    jameslawton, Mar 13, 2014
    #2
  4. Mar 20, 2014 #3
    truckerbangin

    truckerbangin Light Load Member

    262
    44
    Jan 22, 2013
    0
    i have traced the problem to the signal that comes from the brake light switch. with a multi meter i get 12 volts, if i connect the stop and turn light to my output from brake light switch no lights, if i connect the tail light to the output from the brake light switch i get a very dim tail light. i've bin scratching my head for a few hours here and can't think to what would cause that to happen.
     
    truckerbangin, Mar 20, 2014
    truckerbangin, Mar 20, 2014
    #3
  5. Mar 20, 2014 #4
    jameslawton

    jameslawton Light Load Member

    257
    65
    May 1, 2013
    Tulsa OK
    0
    What is the voltage at the tail light its self sounds like a bad ground at tail lights and check voltage at bright light and marker light
     
    jameslawton, Mar 20, 2014
    jameslawton, Mar 20, 2014
    #4
  7. Mar 20, 2014 #5
    truckerbangin

    truckerbangin Light Load Member

    262
    44
    Jan 22, 2013
    0
    forgot to mention i was checking the brake light pin in the connector for the signal light switch with a pigtail and light. if i put the pigtail and light to either pin for rear left or right turn signal i get correct signal light operation.
     
    truckerbangin, Mar 20, 2014
    truckerbangin, Mar 20, 2014
    #5
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