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Tekonsha Custom Wiring Adapter for Trailer Brake Controllers - Pigtail - Toyota

Tekonsha Custom Wiring Adapter for Trailer Brake Controllers - Pigtail - Toyota

Item # 3040-S
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3040-S - Vehicle Specific Tekonsha Accessories and Parts
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Streamline the installation of your trailer brake controller with this custom adapter. Simply connect the wires of the harness to your brake controller and then plug the other end into the built-in port beneath your vehicle's dash. 1-800-940-8924 to order Tekonsha accessories and parts part number 3040-S or order online at Free expert support on all Tekonsha products. Guaranteed Lowest Price and Fastest Shipping for Tekonsha Custom Wiring Adapter for Trailer Brake Controllers - Pigtail - Toyota. Accessories and Parts reviews from real customers.
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  • Reviews (100)
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Tekonsha Accessories and Parts - 3040-S

  • Trailer Brake Controller
  • Wiring Adapter
  • Wired to Brake Controller
  • Tekonsha
  • Vehicle Specific

Streamline the installation of your trailer brake controller with this custom adapter. Simply connect the wires of the harness to your brake controller and then plug the other end into the built-in port beneath your vehicle's dash.


  • Pigtail wiring adapter eases installation of your electric trailer brake controller
  • Connector end plugs into the built-in port beneath the dash of your vehicle
  • Wire end connects to the wires on your brake controller with the included butt connectors
    • Compatible with time-delayed and proportional brake controllers from TrailerMate, Draw-Tite, and Tekonsha
  • Limited 1-year warranty

Installation of Tekonsha Brake Controller Adapter

To install your electric brake controller, you need to connect the wiring of the controller to your vehicle. Certain auto manufacturers offer pre-wired options, typically known as tow packages, wherein wiring is run for you from the dash to the trailer connector on the back of your vehicle. When this is done, a port is installed at your dash so that you can easily plug in a brake controller.

This adapter plugs into the 5-pin connector on your vehicle's built-in brake control wiring harness. The harness is located underneath the dash, to the left of the steering column, taped to another harness near the emergency brake pedal.

To hook this adapter up to your trailer brake controller, just connect the 4 wires of the harness - ground, power, brake switch, and brake power - to the corresponding wires on the brake controller. If your brake controller came with a plug built into its wiring harness, you will have to cut off the plug and connect to the wires themselves.

3040-S Tekonsha Brake Control Pigtail Wiring Adapter - Single Plug - Toyota

Replaces Tow Ready 20265

This Product Fits The Following Vehicles

California residents: click here

Customer Reviews

Tekonsha Custom Wiring Adapter for Trailer Brake Controllers - Pigtail - Toyota - 3040-S

Average Customer Rating:  4.9 out of 5 stars   (100 Customer Reviews)

Streamline the installation of your trailer brake controller with this custom adapter. Simply connect the wires of the harness to your brake controller and then plug the other end into the built-in port beneath your vehicle's dash.


This is not plug and play. It requires another adapter even though the box itself says its plug and play right on the front of it. It does not plug into the brake controller. I guess I have to buy another part? I may have bought it but it was not even recommended by the site.

I see that you had purchased the Liberty Tow Pro from RedArc part # RED24FR
Redarc Tow-Pro Liberty Brake Controller - Dash Knob - 1 to 2 Axles - Proportional
. This controller does not come with the harness that this harness would connect to. You would need part # RED69FR
Universal Wiring Harness for Redarc Tow-Pro Trailer Brake Controllers
as well.
-- Etrailer Expert Jenny N - 04/28/2022


Not compatible with Redarc controller as you need another $20 Redarc harness to plug into the brake controller. Standard female electrical connectors cannot fit the back of the Redarc. Even tried stripping the electrical connector jacket but they will not fit. You would expect the ‘custom’ harness to work but it does not. Purely designed to extract more money for you to buy another harness to supplement the ‘custom’ harness already purchased.

I will have our customer service team reach out to you. For the 2014 Toyota Tundra Red Arc does not have a ready made plug and you will also need part # RED69FR
Universal Wiring Harness for Redarc Tow-Pro Trailer Brake Controllers
to allow it to be plug and play. We are planning to update the fit guided page to allow this to be clearer.
-- Etrailer Expert Jenny N - 12/27/2021

2007 Toyota 4Runner

Literally plug and play with factory tow package on 4th Gen Toyota 4Runner.
Highly recommended to solder Tekonsha harness to Redarc wiring harness pigtails


I wanted to follow up and thank
you for your help! I was able to install the Redarc brake controller with no problem! Thanks for your assistance and recommendations.

One note...There are not a lot of late model Land Cruisers on the road. Toyota only sells about 3-4,000 a year so finding videos and guides for installation is a bit of a challenge. I found some FAQ's on but the information seemed inaccurate or at least not very helpful.

I know the LC comes with a two package and is prewired but it takes some doing to locate it. I remember directions and I found some install help on another site and that helped.

In any event, I appreciate your help. I have attached a photo of the installed Redarc!

2010 Toyota Tacoma

Plugged right into my 2010 tacoma. Gave me plenty of length for mounting everything.


My dealings with etrailer have been a very positive experience. It started with a direct conversation with one of etrailer's sales reps over the phone. He was knowledgeable and respectful. I ordered the product per his recommendation. When the product arrived, I was able to simply plug it into the existing wire harness in my 2003 4x4 Tundra. I followed the instructions on how to install the unit and adjust it to the proper settings without a problem. I have an Iron Bull 5'x10' dump trailer I use all the time and the bake control I purchased from etrailer has actually exceeded my expectations. I'm up and down the Feather River Canyon weekly and I can easily adjust the control unit using the thumb wheel to address the different load weights I happen to be pulling. For the record I so appreciate the fact etrailer allowed me to actually use the product for a year before asking for my feedback. That's how it should be if the seller (provider) wants valid and reliable feedback. Great job etrailer.


This was the easiest on line order I have done. The Etrailer employee featured in the question and answer section on website told me exactly what I needed to order to fit my 2020 Sequoia. I am 81 years old and paid a mechanic to do the install for me. A year younger and I might have done it myself. I highly recommend etrailer should you have the need for any of their products. Great service.


Great product, had it in the truck for almost a year now. Plug and play, with no splicing into the Tundra harness. As shown in photo, a bit of careful drilling and dremelling, I used one of the blank switch locations to locate the controller knob and be able to show the indicator light.


This adapter made the installation of the brake controller super easy. A must have for a clean installation!

Chevrolet Silverado 1500

Thanks for the email. The trailer brake works great! We just traveled to Idaho two weeks ago on a 1500 journey with no problems what-so-ever. Thanks for checking back.


Product made installation of brake controller very clean. Nice quality and nice fit.

It works perfect and looks even better!
Scott - 11/12/2021




very easy to install. I have had this for over 1 year it work great, no problems of any kind. if you follow the instructions I think you will like this as much as I do.


Plug and play as described, no issues at all.

2012 Toyota Tacoma

Just finished the install of the Redarc Tow pro elite controller in my 2012 Toyota Tacoma.

Toyota Tacoma

Very good product, worked great on my Tacoma,would order from E Trailer again. Fast delivery. Thanks


Fast shipping. Product was just as described and worked great.


One of the few brake controllers that allows you to "remote mount" the control unit. Allows for a super clean install that looks like its from the factory rather than having to bolt an obnoxious brick somewhere on your dash only to smash your knee into it anytime you get in your truck. And the actual brake control woks great too! The user interface/control knob is easy to use and provides a simple way making adjustments to the controller. I'm able to easily test the trailer brakes with the push of a button and set the brakes how I want them to function. Installed on a 2012 toyota tacoma.


I ordered these items online with the help of tech support and got the right parts the first time for my mechanic to install on a 2003 Sequoia Limited 2WD. Item 3040-S was installed in conjunction with the Tekonsha Prodigy P3 trailer brake and worked perfectly, and out of the way. With the included bracket i’m able to disconnect and remove the controller from the hot vehicle.


Great product for towing a trailer. I buy a lot of parts from etrailer and they are always good quality parts. I would highly recommend etrailer to any and all who pull a trailer of some type.


We use our Redarc tow pro setup every time we take our offroad trailer camping. The trailer is not heavy but when we are offroad and navigating technical trails it is so nice to have a little more control of the trailer and how it handles. Having the dial makes it so easy to adjust as we are traversing a trail and the 3 axis controller always performs properly even on off camber situations


Wow, They shipped faster than I requested and it arrived early. Great service

2012 Toyota Tundra

I had great anticipation for the delivery and going over the install instructions it was simple install. My biggest worry was trying to make it look clean, 2012 tundra already had tow package so I purchased the specific wire pigtail, so after removing lower dash removing pop out in dash- thanks Toyota- a little work with a Dremel tool for the redarc brake controller in dash install looks EXCELLENT, total install time for me was about 2 hours

2012 Toyota Tacoma

Easy install just plug and play

Toyota Tundra

If you have a Tundra and need to install a brake controller this is a must. It plugs directly into your factory plug underneath the kick panel so you don’t have to run any wires to the rear of the truck

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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Laura H
Updated by:
Laura H
Employee Cole B
Installed by:
Cole B
Employee Alexander C
Written by:
Alexander C

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