Mopar Tow Harness Install

  1. mergedown

    mergedown Well-Known Member

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    #1 Apr 7, 2018
    Last edited: Jun 1, 2018
    Ok, so I got around to installing the Harness today and documented as much as I could remember as I was working. It’s not a terrible job, but took me about 4 hours.

    1. Disconnect the battery. I actually disconnected both the positive and negative.
    E88B1D3C-3EC7-441E-9780-5D27684AEA1D.jpeg

    2. Remove cap and unscrew the plastic bolt holding on the tail light (both sides) and remove the tail light.
    3590E8A1-8F4B-4BE9-A622-4333E7E37544.jpeg
    C2146FF8-47F4-4C63-8F19-70090C2FA694.jpeg

    3. Remove 3 bolts (passenger side) and remove piece 93697236-F5E3-4D44-83C1-B223D6006FBF.jpeg

    4. Remove bolt tray and storage cover.
    81388F90-DBE7-48DC-A4D4-2992E89902F2.jpeg

    5. Remove screw from top left of the subwoofer and remove all the plastics E6E08081-25AA-4A9A-9059-82966EA6184F.jpeg
    3D4B4878-9BDB-46F8-840B-1FB0BC7861D0.jpeg

    6. Remove passenger side door sill trim (front and back) 5135136F-E6F1-4B96-A346-9C32CC664B81.jpeg 35741FCD-2EFE-4D2B-8500-8192E920F431.jpeg

    7. Remove glove box CFA92C57-B95B-4B3F-9236-1CB441BC7436.jpeg

    8. Remove 4 plastic rivets (front passenger side) and two lower clips and pull interior wheel well plastic out of the way.
    710D47A4-893A-4D2D-8096-76E5CE46D05C.jpeg

    9. Feed single wire harness (there are two) through the rubber grommet under the glove box and run under passenger side trim al the way back to the tail light. Connect front end of harness to the fuse box near the battery per the instructions 2C093254-DD5C-47E2-BDCA-A5F3C1042242.jpeg

    10. Run second harness from tail light to the ground bolt and the blue wire up to the glove box
    4D11591E-2D73-4087-BBBD-6E41B1616408.jpeg 1C4C7AB1-30ED-4B4A-BD36-BC19FF228068.jpeg
    96406D1B-68E6-4E41-98B3-DB00D2B7907B.jpeg

    11. Insert red wire that is taped to the harness that runs front to back into connector and plug into controller
    C0950548-089C-477C-AD22-F5E9C2F1F5FF.jpeg

    12. Run wires underneath, red wire and multicolor harness stay under the center of the bumper, two yellow wires run to the other tail light. Re-pin the drive side tail light adapter with the two yellow wires, plug in adapter and replace tail light.
    6A4E1F06-C246-4F13-A295-DE4F6BA1F9E9.jpeg

    13. Wire main plug per the instructions.
    181A3D36-7274-4A00-A2F1-C04353193304.jpeg

    14. ZIP tie wires to top and backside of the frame without letting them get too close to the muffler. Mount the plug with the two bolts provided 37A6E2D7-1E06-42DE-8865-A6EB627A6EC5.jpeg

    That’s about it! Now just put everything back together. There were likely a few minor steps that I missed, but that is 90% of them. I also missed a couple of photos.

    Hopefully this helps everyone! It’s not a terrible job, but takes a bit of time and patience.

    Here is the rivet gun you’ll need to replace the ones you broke when removing the fender well:
    S&G Tool Aid 19400 Rivet Tool for Plastic Rivet https://www.amazon.com/dp/B007QV2E50/ref=cm_sw_r_cp_tai_i_zszeBbYHBJ7P8

    UPDATE:
    Due to some questions I received from others on their install, I wanted to clarify a couple things.
    1.There are 2 red wires. One has to be pinned into the connector that goes to the module. This wire is taped up to the other wires and hard to even see. Make sure you pull out the yellow retaining clip before inserting the wire. The second red wire is longer and goes to the 4/7 pin connector.

    2. The yellow wire that gets pinned into the left tail light harness also requires removing the connector inserts before inserting the them into their proper connectors (male/female).

    Let me know if you have any questions! Hitch has been installed, trailer connected and all is working well!

    8DEBA867-31A3-4ABF-B6D5-1BF0828BA1FA.jpeg
     
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  2. FatBoy01

    FatBoy01 Banned

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    mergedown

    mergedown Well-Known Member

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    I didn’t as the instructions only shows disconnecting the main.
     
  4. jeremyjeep

    jeremyjeep Well-Known Member

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    Is the Tow Harness already installed if you have the towing option from the factory?
     
  5. $uicide$hift

    $uicide$hift Well-Known Member

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    #5 Apr 7, 2018
    Last edited: Apr 7, 2018
    Yes it is part of the towing package. You get the hitch, 4/7 pin connector, and the auxiliary switches for that package.
     
  6. kculp

    kculp Well-Known Member

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    Thank you. i will wait for aftermarket to catch up as all i need is a 4 pin. They do limit towing to only 3500 lbs so this seems like overkill.

    Wow... that is the most complex thing I've ever seen for a trailer wiring harness! Usually it's a 15-20 min job...clip in to the light done... sometimes engineers need to graduate from the college of common sense.
     
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    mergedown

    mergedown Well-Known Member

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    Yes, it is a lot of work, especially compared to th JK install. I would have waited, but I need to tow something this month.
     
  8. Shellbird01

    Shellbird01 New Member

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    It took me about 6 hrs with the hitch. What is the blue wire for? Does it connect to anything in the glove box?
     
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    mergedown

    mergedown Well-Known Member

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    What did you do with the blue wire on your install?
     
  10. $uicide$hift

    $uicide$hift Well-Known Member

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    Somewhere in one of the other hitch threads it was stated this is for the brake controller. You would need to run a wire from the brake controller over to the brake itself, a ground wire, and that blue wire into the controller. I think that was the gist of it from what I recall reading.
     
  11. drogers

    drogers Well-Known Member

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    OMG! You are soooo lucky you left the blue wire disconnected, you do NOT want to know what happens when you connect the blue wire. Your life would forever change, and not for the better.

    I’ve seen combat hardened USMC Gunnery Sergeants poop themselves when even shown a blue wire.

    The blue wire is the only thing Chuck Norris can’t roundhouse.

    You remember ‘the most interesting man in the world’? He thought it would be ‘interesting’ to connect the blue wire. Now he lives in the suburbs. With a cat. And drives a civic.
     
  12. Hootbro

    Hootbro Well-Known Member

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    Thanks for posting the pics, this will help. I bought the kit and just been waiting on weather and a day off to do it.
     
  13. se7en

    se7en Well-Known Member

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    Thanks for posting this @mergedown. Will prove helpful when I do mine.

    Do you anticipate any rattling, post install? Any particular hiccups to watch out for?
     
  14. FatBoy01

    FatBoy01 Banned

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    mergedown

    mergedown Well-Known Member

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    No worries at all, just be careful as your pulling off the plastic trim. They come off pretty easy, but you don’t want to break any of the mounting points. Other than that it really wasn’t too bad, just time consuming.

    Most difficult part was feeding the wire through the firewall.
     
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