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Left signal feeding thru parking lights

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Flightline, Apr 27, 2012.

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  1. Apr 27, 2012 #1
    Flightline

    Flightline Road Train Member

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    My left turn signal is feeding thru all the tractor and trailer parking lights and brake lights.
    Disconnected trailer and still back feeding.
    If I turn on the parking lights, the signal quits flashing.
    I unplug rear brake light bulbs thinking it might have shorted together.
    Also replaced turn signal switch on colum and no different.
    All suggestion appreciated.
     
    Flightline, Apr 27, 2012
    Flightline, Apr 27, 2012
    #1
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  3. Apr 27, 2012 #2
    112racing

    112racing Road Train Member

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    Its a bad ground somewhere
     
    112racing, Apr 27, 2012
    112racing, Apr 27, 2012
    #2
    MNdriver and windsmith Thank this.
  4. Apr 27, 2012 #3
    Flightline

    Flightline Road Train Member

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    I thought about a bad ground but also a bad ground normally would pull ground, not send power to the parking lights.
    Getting power on both sides of the flasher unit when the parking lights are on.
     
    Flightline, Apr 27, 2012
    Flightline, Apr 27, 2012
    #3
  5. Apr 27, 2012 #4
    heyns57

    heyns57 Road Train Member

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    Possibly a broken filament. Replace all left turn bulbs. Disconnect "pig tail".
     
    heyns57, Apr 27, 2012
    heyns57, Apr 27, 2012
    #4
    bender, Flightline and JohnP3 Thank this.
  7. Apr 27, 2012 #5
    112racing

    112racing Road Train Member

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    No the power needs to go somewhere so if the ground is bad it will backfeed ....electricity always takes the path of least resistance
     
    112racing, Apr 27, 2012
    112racing, Apr 27, 2012
    #5
    2bit and MNdriver Thank this.
  8. Apr 27, 2012 #6
    jsnap

    jsnap Light Load Member

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    BAAAAAAAAAAAAAAAAAAAAAAAAD GROUUUUUUUUUUUUUUUUUUUUND that's it don't talk about it any more just Fiiiinnnnnnnnnnnd IT
     
    jsnap, Apr 27, 2012
    jsnap, Apr 27, 2012
    #6
    MNdriver, bender, 2bit and 1 other person Thank this.
  9. Apr 27, 2012 #7
    Flightline

    Flightline Road Train Member

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    I found two wires melted together (left turn signal and tail light) in the wiring feeding the tractor rear lights.
    Sure took a lot of time getting into the rear wiring harness.
    But pulled these two wires apart and it fixed the problem.
     
    Flightline, Apr 27, 2012
    Flightline, Apr 27, 2012
    #7
  10. Apr 28, 2012 #8
    belltransit

    belltransit Light Load Member

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    good thing flightline didnt listen to u guys yelling bad ground...he would still have a problem. all the times ive had to deal with light problems a bad ground will either not let the light work or it will be real dim..
     
    belltransit, Apr 28, 2012
    belltransit, Apr 28, 2012
    #8
    Hammer166 Thanks this.
  11. Apr 28, 2012 #9
    black_dog106

    black_dog106 Road Train Member

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    Glad you found it Flightline. Just went through a small fix with Western Star's wonderful wiring. A wire pulled (rotted) out of a plug feeding LF directional. Electricity will try to go somewhere. As 112 said, it will take next path of least resistance. In my case, it was trying to ground through parking lights.
    And as heyn said, sometimes a bad bulb does the same thing. If "juice" cant get through bulb, it trys to go next easiest path. Electricity can do some strange and weird things when its normal path is interupted. :biggrin_25514:
     
    black_dog106, Apr 28, 2012
    black_dog106, Apr 28, 2012
    #9
  12. Apr 28, 2012 #10
    MNdriver

    MNdriver Road Train Member

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    Yop.....a short to ground.....

    It's leaving the circuit you want it in and shorting to a ground some where else.

    Now, if the insulation was melted together. Why and what caused that....

    Sounds like someone used the wrong bulbs in the trailer.
     
    MNdriver, Apr 28, 2012
    MNdriver, Apr 28, 2012
    #10
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