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"Factory" 7pin Trailer Harness Installation

Discussion in '2nd Gen. Tacomas (2005-2015)' started by Sandman614, Sep 7, 2015.

  1. Sep 7, 2015 at 9:56 PM
    #1
    Sandman614

    Sandman614 [OP] Snarky TWSS elf, Travis #hotsavannahdotcom, LRGRNR

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    Here is my version of a "factory" 7pin trailer harness for any 2nd gen (2005+) that didn't come with a 7pin trailer harness. Note: Toyota does not sell a true factory 7pin harness afaik.
    Notice: check all wiring diagrams for your truck before cutting/splicing/running wires to make sure your wiring is the same as this. Though this should work on all non-7pin harness 2nd gens.
    **If you look under you're truck and you have these 2 connectors (BE1 connector) between the drivers side frame rail and spare tire then you don't need this how-to.


    Parts List:
    - 1x Sumitomo TS / SL Female Terminal 0.5 - 1.25 mm2 ( 20 - 16 AWG ) *I have a couple for sale
    - Crimp Tool for Weather Pack and Metri-Pack
    - Factory 4pin harness
    {2005-2010: 08921-04960}
    {2012-XXXX: PT725-35120}
    - Hopkins 48470
    - Waterproof 3pin connector set (Metri-pack 630)
    - ~25ft Yellow wire (14ga)
    - ~8ft Blue wire (14ga)
    - Scotch lock or custom taillight coupler *explanation below
    - Zip ties
    - Brake Controller (Tekonsha P3)

    Installation:
    1. Feed your Yellow wire through the factory 4pin harness loom. This serves to protect the wire. **optional, it's kind of a pain but it looks better.


    2. Install the factory 4 pin harness. We will use the factory 4pin harness that Toyota sells, because why not use what they make available!
    4pin installation instructions
    2005-2010: 08921-04960.pdf
    2012-XXXX: PT725-35120inst.pdf
    [​IMG]


    2.5. In Progress (credit @caribe makaira). Even if you have the 5pin connector (T 7) for the brake controller, you still need power for it. The 30amp TOWING BRK fuse slot doesn't have both connectors in it so you can't just pop a fuse in.

    3.
    Crimp the Sumitumo terminal to the 'cab' end of the Yellow wire.

    4. Insert Yellow wire with terminal into Pin-8 of the ID2 connector inside the drivers kick panel. On our trucks Toyota did not put in the wire from the brake controller to the rear of the truck.



    5. Route the Yellow wire along with the 4pin harness loom if you did not run it inside of it. Use zip ties as you see fit.

    6. Remove the Drivers side taillight and use the Scotch lock to tap into the reverse light (R-W) wire. Alternatively you can make a custom line splice out of an old/broke aftermarket towing harness







    7. Route the Blue wire down to meet the 4pin harness. Use zip ties as you see fit

    8. **optional, route a 10-12ga 12v+ wire through a relay and fuse/breaker from the battery to the rear along the 4pin harness. Use zip ties as you see fit.

    9. Cut your 3 extra wires (Blue Reverse, Yellow Brake Controller, and Power) with a little slack even with the plug at the end of the long 4pin harness loom. Now crimp these three wires in the Waterproof 3 pin connector.


    10. Cut the 4pin harness (smaller section) about 1/4 of the back from the Flat trailer plug and splice the square 4pin plug and the 3pin plug to the 7pin trailer plug. **just pretend for now that the 3pin plug is there, and the yellow wire is tucked inside the loom.**



    11. Mount your 7pin trailer plug as you see fit.

    12. Install your brake controller per its instructions. I am using the Tekonsha P3, simple plug and play. Make sure you get/have the Toyota pigtail to plug the brake controller in.
     
    Last edited: Aug 16, 2016
  2. Sep 8, 2015 at 6:15 AM
    #2
    holyfield19

    holyfield19 GO TIGERS!

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    Busted CV boots and lots of squeaks.
    [​IMG]

    This is where I moved mine too. Super easy to do with a hole saw on the factory bumper. This way it doesn't hang down below the truck.
     
  3. Sep 29, 2015 at 8:52 PM
    #3
    crabhab

    crabhab Member

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    Thanks for the leg work! I am outfitting a 2015 4cyl Pre Runner for towing.
     
    Sandman614 [OP] likes this.
  4. Sep 29, 2015 at 9:00 PM
    #4
    Sandman614

    Sandman614 [OP] Snarky TWSS elf, Travis #hotsavannahdotcom, LRGRNR

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    ARB Front Bumper, Projector Headlights w/Slimcubby 4300K HID's, Oznium LED's, LED taillights, DIY Washable Cabin Moose Filter, Sockmonkey SR5 Off Road, Aux Audio plug, OME 886x, OME Nitrochargers, Wheelers 3 Leaf Progressive AAL, ImMrYo Rear-View Mirror Lift Bracket, Dodge D-Rings
    I'm glad it could help someone
     
  5. Oct 5, 2015 at 8:31 PM
    #5
    crabhab

    crabhab Member

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    Quick question, your using the factory trailer brake controller plug located next to the fuse box for trailer brake controller power, ground and brake signal? I see how you tapped into the ID2 plug at the missing brake controller wire and ran the yellow back to the 7 way.


    I plan on using my curt plug in controller at the back of the truck with a curt 4way to seven way converter and add the brake controller wire. I will be missing the reverse and trailer 12v+ but not a big deal for my 16ft flat bed.


    Just think I just got rid of a 2013 f150 lariat crew cab 4x4 eco boost......I miss that truck no rigging wires....

    My 2008 4Runner has the factory hitch and 7way simply plug and play.
     
  6. Oct 5, 2015 at 10:12 PM
    #6
    Sandman614

    Sandman614 [OP] Snarky TWSS elf, Travis #hotsavannahdotcom, LRGRNR

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    Yes the brake controller will plug into the factory harness, you will need to make sure you get a controller with the Toyota pigtail or buy it seperate.
     
  7. Oct 5, 2015 at 10:34 PM
    #7
    crabhab

    crabhab Member

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    Thanks for the clarification.
     
  8. Oct 5, 2015 at 10:53 PM
    #8
    Sandman614

    Sandman614 [OP] Snarky TWSS elf, Travis #hotsavannahdotcom, LRGRNR

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  9. Oct 5, 2015 at 10:54 PM
    #9
    crabhab

    crabhab Member

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    That's a descent controller i installed one on my 2008 F150 worked well with my 19ft travel trailer
     
  10. Oct 5, 2015 at 10:55 PM
    #10
    crabhab

    crabhab Member

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    I am going with a Reese POD and putting it in the drop down change holder where the fuses are so I can hide it. This truck has a very small interior
     
  11. Aug 15, 2016 at 7:51 PM
    #11
    IdRatherBNTheSanJuans

    IdRatherBNTheSanJuans Well-Known Member

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    Just for my clarification, the metri pac 3 way connector is used in step 9 correct?

    Thanks! And thanks for the write up!
     
  12. Aug 15, 2016 at 8:20 PM
    #12
    Sandman614

    Sandman614 [OP] Snarky TWSS elf, Travis #hotsavannahdotcom, LRGRNR

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    Correct, I just didn't have it in time for the write up. This reminds me I need to reinstall it after the frame swap.
     
  13. Aug 15, 2016 at 8:24 PM
    #13
    caribe makaira

    caribe makaira Well-Known Member

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    For Battery Charging..right?

    Props for the install...:thumbsup:
     
  14. Aug 15, 2016 at 8:24 PM
    #14
    Sandman614

    Sandman614 [OP] Snarky TWSS elf, Travis #hotsavannahdotcom, LRGRNR

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    Correct!
     
  15. Aug 15, 2016 at 10:36 PM
    #15
    IdRatherBNTheSanJuans

    IdRatherBNTheSanJuans Well-Known Member

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    Any recommendations as to where to get the metri-pack 630 3 pin connector and theSumitomo TS / SL Female Terminal 0.5 - 1.25 mm2 ( 20 - 16 AWG )?

    What AWG should the metripack be for?

    Sorry for all the questions! I'm finding them online, but would prefer a recommendation if someone had a good, fast-shipping, source.
     
  16. Aug 15, 2016 at 11:32 PM
    #16
    caribe makaira

    caribe makaira Well-Known Member

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    How did you get juice to the trailer break control since your '06 didn't have the tow from factory?
     
  17. Aug 16, 2016 at 7:40 AM
    #17
    Sandman614

    Sandman614 [OP] Snarky TWSS elf, Travis #hotsavannahdotcom, LRGRNR

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    I got the metripack from eBay and the sumitomo from Ballenger autosport. Metripack awg should be enough to handle 12v power for charging trailer batteries (10 or 12awg) , or smaller if you don't want that (14 - 16awg).

    My truck had the plug in for the brake controller tucked away in the side kick panel. Just have to find it and plug in the brake controller.
     
  18. Aug 16, 2016 at 1:24 PM
    #18
    caribe makaira

    caribe makaira Well-Known Member

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    So your engine fuse block had the 30 amp towing brake fuse slot ready...nice:thumbsup:
     
  19. Aug 16, 2016 at 2:39 PM
    #19
    IdRatherBNTheSanJuans

    IdRatherBNTheSanJuans Well-Known Member

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    Wonder if mine does...
     
  20. Aug 16, 2016 at 3:02 PM
    #20
    caribe makaira

    caribe makaira Well-Known Member

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    Mine didn't/doesn't...:facepalm:

    upload_2016-8-16_18-2-38.jpg
     

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