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Trailer Wiring Harness

Discussion in '3rd Gen Tundras (2022+)' started by pyoung62, Dec 5, 2023.

  1. Dec 5, 2023 at 1:14 PM
    #1
    pyoung62

    pyoung62 [OP] Retired

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    Has anyone tapped into the trailer harness yet? I'm adding the Morimoto backup boost bar since backup lights on this truck suck just as bad as they did on my 2018 F150. I added it to that truck and it works amazingly well.

    I need to tap into the wiring harness, but am not having any luck finding a wiring diagram for the gen 3. I found one for a 2022 Sequoia which showed the same colors as my F150 - yellow for backup light and white for ground. But I don’t know if that’s a standard. Yes…I know I can always use my Fluke and test it, but I really don’t like to penetrate the insulation on an external harness just to test and let road salts and other crap into the copper.
     
    Last edited: Dec 5, 2023
  2. Dec 5, 2023 at 1:43 PM
    #2
    teab

    teab 2023 Platinum w/ PRO bits

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    **Edit you need a 5-way plug if you want reverse.

    Don't have to splice your wires at all if you spend about $30.00, Basally add a harness that plugs into your current harness and a 4-way and you're off to the races. Get behind the bumper unplug the OEM harness going to the 7-way/4-way and add in the first harness below.

    This will add a 4 way plug to your harness with no splicing.
    https://www.amazon.com/dp/B0009FJ38Q

    Then you can plug in a 4-way and tap/wire it to reverse.

    https://www.amazon.com/dp/B001GN3BSI?th=1
     
    Last edited: Dec 5, 2023
  3. Dec 5, 2023 at 1:52 PM
    #3
    DRP

    DRP Old Member

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    Would you be able to post pics once you get this installed? Definitely interested in adding to my truck as well. TIA.
     
  4. Dec 5, 2023 at 1:53 PM
    #4
    teab

    teab 2023 Platinum w/ PRO bits

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  5. Dec 5, 2023 at 1:57 PM
    #5
    jctmundra

    jctmundra New Member

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    Connector comes off backside or 7 wire connector. Black/white is ground, beige is reverse lights.

    Watch the placement, about 1/8in clearance when tail down.
    upload_2023-12-5_16-56-8.png
    upload_2023-12-5_16-56-36.png
    upload_2023-12-5_17-0-39.png
     
    pyoung62[OP] likes this.
  6. Dec 5, 2023 at 1:59 PM
    #6
    pyoung62

    pyoung62 [OP] Retired

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    I haven’t pulled the plug off the backside yet, but that might work. Was hoping someone had skinned this cat already and could just confirm the colors though.
     
  7. Dec 5, 2023 at 2:02 PM
    #7
    pyoung62

    pyoung62 [OP] Retired

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    Thanks! The Morimoto bar I’m using goes over the license plate screws. Makes it look like it’s part of the plate frame. Clearance shouldn’t be an issue. I do like how yours looks though.
     
  8. Dec 5, 2023 at 2:03 PM
    #8
    pyoung62

    pyoung62 [OP] Retired

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    Will do!
     
  9. Dec 5, 2023 at 2:03 PM
    #9
    jctmundra

    jctmundra New Member

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    those are morimoto plate lights
     
  10. Dec 5, 2023 at 2:08 PM
    #10
    pyoung62

    pyoung62 [OP] Retired

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    I see. I actually like that look a lot. Having had one on my F150, I can’t even imagine how bright two of them are. Just one was bright as ****!
     
  11. Dec 5, 2023 at 2:13 PM
    #11
    jctmundra

    jctmundra New Member

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    Make sure you have the clearance when tail drops as the light will be above the plate, it won't be much. I ended up with double side taping them.
     
    pyoung62[OP] likes this.
  12. Dec 5, 2023 at 2:19 PM
    #12
    pyoung62

    pyoung62 [OP] Retired

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    So are you saying when you attached it to the plate frame, it still stuck up enough that the tailgate was that close? Or that it was close where you have them mounted now?
     
  13. Dec 5, 2023 at 2:30 PM
    #13
    jctmundra

    jctmundra New Member

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    It's close everywhere. The cannot go any higher where they are now. I did try the plate, either really close or hit. Be really caution on the clearance.
    If you have not purchase the light bat yet, may be better getting a flush mount set for the plastic bumper panels for DD /Baja etc.

    I had the Morimoto's in the mod pile for another use and decider to use both here.

    I am looking into repurposing the front LED fog lights into backups in the plastic fillers in the bumper. Light length is the issue as there is a steel bumper support right in the middle of the fillers
     
  14. Dec 5, 2023 at 2:54 PM
    #14
    pyoung62

    pyoung62 [OP] Retired

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    Good to know. Many thanks! I’ve already ordered it, so will have to figure it out, but I will definitely take your advice and go slowly.
     
  15. Dec 5, 2023 at 3:15 PM
    #15
    dodgemaniac

    dodgemaniac New Member

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    PNW
  16. Dec 5, 2023 at 3:35 PM
    #16
    jctmundra

    jctmundra New Member

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    That is nice. I had added a brake light on my plate with modulator from my motorcycle days to wake the txt'rs which I used the aux power from the trailer to power it. Would have been so much easier to wire on the bench than on the back under the bumper.
     
    Soupbean77 likes this.
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