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   Trailer Connection Issue - Lights Work but Trailer Not Recognized

   • cwsartain
   • Nov 7, 2021
   • 6.7 Electronics Discussion (2011-2016)

   10

   1K

   Nov 10, 2021

    by DTMurrell
   1. 

      The Evil Twin

      · Premium Member

      Joined Jan 23, 2018

      ·

      2,941 Posts

      #6 · Nov 8, 2021

      Only show this user

      cwsartain said:

      Is that pretty simple to do? Can you explain how you did it or point me to a resource that you used to wire the up? Thank you!!

      Click to expand...

      No real plans or anything. I'm a ME with a EE skill set so I just came up with it my head first. Lol. But here is what I did:
      Picked up the following stuff from the Amazon express- 7 way harness with terminal box and a pair of cheap magnets.
      

      

      Amazon.com: ONLINE LED STORE 8ft 7-Way Trailer Plug Wiring Harness w/ 7 Gang Trailer Junction Box [7-Pin Trailer Cord Wire Cable] [Waterproof] 7 Prong Trailer Wire/Cable Connection Box : Automotive

      Buy ONLINE LED STORE 8ft 7-Way Trailer Plug Wiring Harness w/ 7 Gang Trailer Junction Box [7-Pin Trailer Cord Wire Cable] [Waterproof] 7 Prong Trailer Wire/Cable Connection Box: Connectors - Amazon.com ✓ FREE DELIVERY possible on eligible purchases

      www.amazon.com

      
      

      Amazon.com

      
      Then I detached the existing trailer 4 way wiring from its mounts all the way to the underside of the trailer. I ran the new 7 way from the coupler (leaving slack to connect to the truck) in the same route the 4 way ran. Then mounted the new 7 way box underneath the trailer near where the existing 4 way wiring came together. The existing wires were cut, stripped and terminated in the new junction box at the specified terminals. I stopped there to make sure all the existing lights worked.
      So for the magnets.... I used a silicone adhesive and mounted the magnets right on the frame rail near the junction box. Essentially glued them to the frame. Lol. The leads were wired in parallel (+ leads together and - leads together) to the brake terminal in the junction box and the ground. When I use the brakes, it energizes the magnets. Obviously nothing happens. I believe the truck just sees the resistance of the magnets and that triggers it to turn off the back up warning. It also increases the bump turn signal by 2 extra flashes.
      Hope that all made sense. The other cool thing is that it made it easy to add reverse lights to the trailer. Makes it easier to back up the driveway at night.

      Show Less

       
   2. C

      cwsartain

      · Registered

      Joined Nov 2, 2021

      ·

      6 Posts

      Discussion Starter · #7 · Nov 8, 2021

      Only show this user

      The Evil Twin said:

      No real plans or anything. I'm a ME with a EE skill set so I just came up with it my head first. Lol. But here is what I did:
      Picked up the following stuff from the Amazon express- 7 way harness with terminal box and a pair of cheap magnets.
      

      

      Amazon.com: ONLINE LED STORE 8ft 7-Way Trailer Plug Wiring Harness w/ 7 Gang Trailer Junction Box [7-Pin Trailer Cord Wire Cable] [Waterproof] 7 Prong Trailer Wire/Cable Connection Box : Automotive

      Buy ONLINE LED STORE 8ft 7-Way Trailer Plug Wiring Harness w/ 7 Gang Trailer Junction Box [7-Pin Trailer Cord Wire Cable] [Waterproof] 7 Prong Trailer Wire/Cable Connection Box: Connectors - Amazon.com ✓ FREE DELIVERY possible on eligible purchases

      www.amazon.com

      
      

      Amazon.com

      
      Then I detached the existing trailer 4 way wiring from its mounts all the way to the underside of the trailer. I ran the new 7 way from the coupler (leaving slack to connect to the truck) in the same route the 4 way ran. Then mounted the new 7 way box underneath the trailer near where the existing 4 way wiring came together. The existing wires were cut, stripped and terminated in the new junction box at the specified terminals. I stopped there to make sure all the existing lights worked.
      So for the magnets.... I used a silicone adhesive and mounted the magnets right on the frame rail near the junction box. Essentially glued them to the frame. Lol. The leads were wired in parallel (+ leads together and - leads together) to the brake terminal in the junction box and the ground. When I use the brakes, it energizes the magnets. Obviously nothing happens. I believe the truck just sees the resistance of the magnets and that triggers it to turn off the back up warning. It also increases the bump turn signal by 2 extra flashes.
      Hope that all made sense. The other cool thing is that it made it easy to add reverse lights to the trailer. Makes it easier to back up the driveway at night.

      Click to expand...

      This is exactly what I needed. Thank you so much for the informative response!!

      Show Less

       

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