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Trailer wiring problems. HELP

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Half Throttle, Mar 11, 2013.

  1. Mar 11, 2013 #1
    Half Throttle

    Half Throttle Bobtail Member

    4
    0
    May 9, 2012
    Barbourville, KY
    0
    Ok I have a trailer that the wiring is all screwed up on. I have the correct wires hooked up but don't understand what to do with the red wire (brake). I don't understand why or how when I hook it up it kills my turn signals. If you have your standard 3 wire light (ground, tail, stop/turn) ground to frame yellow or green to turn and black or brown to tail. Now when I hook up red to turn/stop and power it and it turns on all four lights light up like the brake is on. I'm sure it is back feeding but I don't understand how you fix the problem I have searched the net but can't find any diagrams or info on what to do. Am I doing something incorrectly? I need help please it is a semi trailer 7 pin round. Thanks in advance.
     
    Half Throttle, Mar 11, 2013
    Half Throttle, Mar 11, 2013
    #1
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  3. Mar 12, 2013 #2
    Pablo-UA

    Pablo-UA Road Train Member

    7,604
    1,642
    Oct 11, 2010
    Borispol, Ukraine
    0
    really there are separated wires for trailer turn signals. one wire for righ, one for left, not connected to brake wire. install two yellow dir. lights and be happy) LOL
     
    Pablo-UA, Mar 12, 2013
    Pablo-UA, Mar 12, 2013
    #2
  4. Mar 12, 2013 #3
    nikmirbre

    nikmirbre Road Train Member

    5,371
    9,543
    Jul 27, 2011
    High Point NC
    0
    I had this issue in my trailer when i picked it up from great dane after getting some work done. Only problem was when the wire was spliced, they switched wires,,,,,
     
    nikmirbre, Mar 12, 2013
    nikmirbre, Mar 12, 2013
    #3
  5. Mar 12, 2013 #4
    CatPowerC15

    CatPowerC15 Medium Load Member

    347
    90
    Feb 18, 2010
    Siler City, NC
    0
    Trailers, unlike tractors, need a seperate light for the brake lights. Signal lights and brake lights cannot be wired together on a trailer. But, older trucks hooked to newer trailers will blink both on a trailer. Older trucks (pre 1980) will also light the side blinkers while the brakes are pressed.
     
    CatPowerC15, Mar 12, 2013
    CatPowerC15, Mar 12, 2013
    #4
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