I Wired-In a New Harness and the Right Turn Signal & Brake Controller are Not Working

Comments

• MuttonChops Member Posts: 1,922

  April 30

  Does the 'new' 7-pin cable have a wiring diagram WITH wire colors and signal name? (not all cables use the same color code)
  If not, use an ohmmeter to trace the Connector positions to the wire colors.
  
  Confirm you installed the 'new' cable based on Signal Name Location.
  
  Several resources on web & in this forum.
  One Junction Box Diagram:
  
  

  '18 320 S,  pitched axle, 3020HE; PNW based
  

  TV: '17 Colorado V6 Z71 4x4, Tow Package, GM Brake Controller
  TV: '25 Canyon AT4
  Adventures:  58   Nights:  405  Towing Miles 50,180

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• Bayliss Member Posts: 1,496

  May 1 edited May 1

  @michaelroyy, your wiring looks identical to my 2019 junction box wiring, except that mine has a blue wire connected between the trailer emergency breakaway switch and terminal #1 in the junction box.  Yours has two black wires that appear to be joined together with a single terminal lug.  I'm not clear as to what those wires are, unless one is from the trailer brakes, and the other is from the breakaway switch.
  
  The other connection that I cannot clearly see is the black wire exiting the wire loom on the left, which appears to be connected to terminal #6 (but, potentially, to #7) - - I have a red wire connected between the breakaway switch and terminal #6, so maybe yours is just black rather than red??  (I agree with the comment by @MuttonChops re confirming the color codes, because that may what the issue is).  
  Maybe double-check each of the connections I have referenced.
  
  Terminal #2 (brown wire) is for the right turn/stop lights - - it appears to be wired correctly.
  
  Double-check your ground wire connections as well.  Often times, that is the simple solution.
  
  If it is of any assistance, I have included a closeup of the drawing posted by @MuttonChops so you can see the wire colors clearly, as well as a photo my junction box connections.  Good luck!!
  
  
  
  
  

  2019 T@B 320 S Boondock Lite; 2025 Toyota Tundra CrewMax 4x4
  (Alde: 3020; Refrig: Isotherm Cruise 65 Eleg; Battery: BB 100Ah LiFePO4; Solar: Renogy 220W Portable Suitcase w/ Victron SmartSolar MPPT 75/15 Controller; Victron BMV-712 Battery Monitor w/ Shunt; Pwr Cntr: PD-4135KW2B; EMS: PI-HW30C)
  Greg & Marlene (Tucson, AZ)
  
  
  

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• michaelroyy Member Posts: 48

  May 1

  Thank you both for responding and the details. I will probably be at it today. Probably start out with my meter and work from there on the diagram & pictures. To be continued...   

  2015 Boondock

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• Grumpy_G Member Posts: 701

  May 1

  I'm late to the party but this might help : https://johnsontrailerparts.com/how-to-wire-a-7-way-trailer-plug-trailer/ it shows the different wiring colors for SAE and RV. 

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