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Universal Wiring Harness for Redarc Tow-Pro Trailer Brake Controllers

Universal Wiring Harness for Redarc Tow-Pro Trailer Brake Controllers

Item # RED69FR
Our Price: $23.50
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Redarc Wiring Adapter Accessories and Parts - RED69FR
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Universal wiring harness allows you to install the Tow-Pro brake controller in your vehicle without a factory tow package. Plug one end of the harness into the brake controller and the other end splices into your vehicle's wiring. 1-800-940-8924 to order Redarc accessories and parts part number RED69FR or order online at Free expert support on all Redarc products. Great prices and Fastest Shipping for Universal Wiring Harness for Redarc Tow-Pro Trailer Brake Controllers. Accessories and Parts reviews from real customers.
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Redarc Accessories and Parts - RED69FR

  • Trailer Brake Controller
  • Wiring Adapter
  • Redarc

Universal wiring harness allows you to install the Tow-Pro brake controller in your vehicle without a factory tow package. Plug one end of the harness into the brake controller and the other end splices into your vehicle's wiring.


  • Universal wiring adapter provides a quick-disconnect for your electric trailer brake controller
    • No need to cut the plug off the brake controller to wire it directly to your vehicle
    • Makes it simple to plug and unplug controller for use in a different vehicle or for storage when you're not towing
  • Wire end splices into your vehicle's wiring
    • Use on a vehicle that does not have a factory tow package or is not equipped with a plug-in port
  • Connector end joins with the plug on your electric brake controller
    • Compatible with Redarc Tow-Pro brake controllers
  • Made in the USA
  • 2-Year warranty

TPH-025 Redarc Wiring Harness for Tow Pro Electric Brake Controllers

This Product Fits The Following Vehicles

Video of Universal Wiring Harness for Redarc Tow-Pro Trailer Brake Controllers

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Review of Redarc Trailer Brake Controller Parts - Universal Wiring Harness - RED69FR

Ellen: Hey everyone. I'm Ellen here at And we're going to be taking a quick look at the Universal Brake Wiring Harness for your Redarc brake controller. This allows you to connect your Redarc brake controller to any kind of vehicle even if it doesn't have a factory wiring harness. So you do have to connect these wires in. You will have to do some cutting and slicing to get those in place.

But it's pretty straightforward, so we'll talk about that in just a second. The other end is going to plug into that main unit on your Redarc brake controller. So just plugs in there and it's pretty easy.As far as the wires, you're going to have a white wire that goes to ground. The blue wire, which will connect to the brakes on your trailer. So this will run all the way back to your wiring socket on the back of your vehicle.

Red wire goes to your brake signal. So this goes to the actual electrical signal from your brake. And then this goes to a power source. Typically, from your battery or maybe from the fuse box on your vehicle. But a 12 volt power source, it's where that needs to go.

It does have complete instructions on how to get this installed, and some tips on how to do that. I would also suggest that you want to get some butt connectors to make those connections.And also a couple of zip ties to keep the wiring nice and tidy underneath your dash, so that it doesn't get tangled up with your pedals while you're driving, or your feet, or anything like that. You can find butt connectors and zip ties here at So if you want to pick those up while you're here, not a bad idea. So that's pretty much all there is to it for our look at the Universal Wiring Braking Harness.

It is made in the USA, and it is covered by a two-year warranty. I hope this video has been helpful in deciding if this is the right one for you. We do have a couple of custom fit options, so check those out if you have a appropriate vehicle, but this one should work for just about anything out there. Thanks for watching..

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Customer Reviews

Universal Wiring Harness for Redarc Tow-Pro Trailer Brake Controllers - RED69FR

Average Customer Rating:  4.8 out of 5 stars   (369 Customer Reviews)

Universal wiring harness allows you to install the Tow-Pro brake controller in your vehicle without a factory tow package. Plug one end of the harness into the brake controller and the other end splices into your vehicle's wiring.


Overall, I’m completely happy with the REDARC Tow-Pro Liberty controller. The design and execution is elegant, the installation is fairly simple, and the completed appearance -in my opinion- is unmatched. I’m slightly annoyed that the REDARC product doesn’t come with some basic accessories you need, leaving you to hunt for and assemble things they know you’ll need like a fuse, fuse-holder, and the basic wiring harness to even connect to the REDARC Tow-Pro Liberty. So, if you’re price shopping different brake controllers I recommend factoring in about another $50 worth of accessories into the overall cost of the product when considering the REDARC Tow-Pro Liberty and comparing it to other brake controllers. The folks at, of course, make that simple by suggesting the items you’ll need automatically.

There is one “feature” of the REDARC Tow-Pro Liberty that is made VERY clear in the owner’s manual, that perhaps should be made clearer when advertising the product: The Brake Sense wire, which is the wire that connects to your brake lights and tells the controller you’ve activated the tow vehicle brakes, is bi-directional. In other words, in normal proportional operation it senses the 12 volts from your brake lights, but when in manual mode it also outputs 12 volts with the intention to activate your brake lights if you manually activate the REDARC controller. This matters a lot if your tow vehicle has factory automatic braking and collision avoidance or adaptive cruise control as the REDARC Tow-Pro Liberty can back feed these systems and cause a lot of damage. When the Mazda is in adaptive cruise control, or if the factory collision-avoidance system activates, the Mazda also activates the brake lights. A blocking diode is the solution and the placement is critical.

I have a 2020 Mazda CX-5 with AWD and their turbo 2.5-liter engine and the factory adaptive cruise control and collision-avoidance systems. The vehicle has a 2,000-lb towing capacity. I am towing a teardrop styled camping trailer that weighs 1,200-lbs, so I’m well within the capability of the vehicle. Trailer brakes just enhances the safety. Mazda is curiously quiet on their recommendation of how to properly wire this, and the dealership really wasn’t any additional help. This set me to find schematics and figure it out on my own.

The solution included two devices. The REDARC Tow-Pro Liberty, and the Tekonsha model # 118746 Trailer wiring module; both from I installed the Tekonsha trailer light wiring system first, then installed the REDARC controller. Instead of connecting the REDARC brake sense wire to the normal brake lights, I connected it to the positive side of the wire that feeds the rear center brake light on the Mazda. This is where I installed a 50-cent Schottky diode to allow the brake light to send +12v to the REDARC controller but prevent the REDARC controller from sending +12v back to the center brake light when the brake controller is in manual mode. I’ve included a schematic in this review as one of the photos; I hope this helps others.

The result is beautiful. You get the aesthetically pleasing factory appearance of the single-knob REDARC controller in the dash, that operates perfectly in both automatic proportional mode and in manual mode, AND the Mazda’s adaptive cruise control and automatic collision avoidance system still operates perfectly and will also automatically operate the REDARC controller and your trailer brakes. The REDARC Tow-Pro Liberty can install in any orientation, which makes installation a breeze, the proportional braking is smooth and confident. I’m extremely pleased with both products: The REDARC controller and the Tekonsha wiring model # 118746 and thrilled with who offered both at a reasonable price and reliable shipping/delivery.


This sure does look nice when done. I mounted it under the steering column and the knob as in the photos. The instructions were straight forward and installation was easy. I did make a custom panel for the control knob added a couple switches for future use) and I did make a custom bracket for the 7 wire trailer connector.


Make install straight forward. Finding a location on my 2016 Haghlander was challenging. If using the existing rubber grommet on the passenger side firewall, on the 2014 to 2019 Highlander order an extra 5 or 6 feet of the black and white encased wire.


Worked perfectly, but should have come with the Tow Pro Liberty.


Not much to say on this product. It plugs in to the controller and then you wire it up. Obviously, if your vehicle has a plug in for a brake controller buy the harness that is specific to your vehicle. My car did not have that ability and I was going to have to wire it myself (no plug and play) and this did the trick.



Still working as expected after a year.

2016 Kia Sorento

I really like the simplicity of the controls and the look once installed. I am using this to tow my Aliner pop up and like to keep things simple without creating an eyesore on the interior of my car. I had a competitive bluetooth controller that I eventually gave up on. I had intermittent issues with brakes locking up, and even a few times not engaging at all. This controller brakes perfectly and looks great. I installed this on the fuse panel cover so if I sell my 2016 Sorento, I can potentially swap this out with a new cover if the new buyer does not want it.

This solved potential safety issues with my old controller, and towing is far less anxious due to the smooth braking.

I will follow up after one year, I hope this thing keeps working like it is now.


Great help from the staff, to determine what to order and how to install it. I am very happy with my choice to use them as a source for my equipment.

Toyota Highlander

We have gone on over 7trips
with our trailer which almost Max's out the capacity of our Highlander and it only took 2 stops to adjust the trailer brakes, from then on it has performed flawlessly on every occasion, even through the mountain roads of Colorado. The best part, it looks stock and nobody knows it's there.

2010 GMC Sierra

East to install in my 2010 GMC Sierra. Works excellent and looks good too. I would definitely buy again.


Could not of wiried up without it finding the right wire to tap into was difficult


I am very happy with the controller and the harness kit. I installed the controller myself in about 4 hours. Over the past year I have taken several trips covering about 7000 mikes, both on and off road, and the controller has worked perfectly.


This is a great controller! I will be removing and reinstalling if I ever need to buy a different vehicle, the simplicity of this thing is just truly amazing


Doesn’t work

Etrailer Expert

Jenny N.


I wanted to see if you could explain in more detail what is happening with the harness.


The only negative thing I can say is I had to buy this separately, it should have been included with the brake controller


This product is still working great after the first year and was easy to install.


Product shipped quick and arrived when promised. Customer service went above and beyond to take care of me.


It's the right part and I got it on time in good shape,what else can I say


always quality product fair price fast shipping.


This connector is required to complete the installation of the controller. Great product!

2023 Jeep Grand Cherokee

Worked great. Decided to add a diode to the red wire so my brake controller wouldn't trigger my Jeep's brake lights when I push the manual button, probably not required, but it makes me feel better.


Worked great

John W.


Works fine


Made wiring simple


I like having the controller hidden so as not to be in the way, but the control is handy I like showing everyone what a neat installation looks like.

2013 Toyota Highlander

etailer told me over the phone that this part is required for RedArc break controller install and emailed me a cart of everything I needed. It wasn't needed and now they want to make me pay $XX return shipping on a $XX item. Are you serious!


Just the pigtail for the Tow Pro it is what it is. I wish it came with it or in the description it made it clear that it did not come with a wiring connector..

Show More Reviews

See what our Experts say about this Redarc Accessories and Parts

  • Why Does The Redarc Universal Wiring Harness Use 14 Gauge Wire?
    All of the Redarc Universal Wiring Harness like the # RED69FR use 14-gauge wire. It's just how they are made. It is fine to use 14-gauge wire for those connections. As long as you are using wire equal to, or greater is size then you will be fine.
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  • Recommended Brake Controller for 2024 Ford E-450
    For your 2024 Ford E-450 I recommend the Redarc Tow-Pro Liberty # RED24FR. This brake controller is reliable and takes up almost no space in the cab. The main unit installs behind the dash so only the control knob is visible. The knob controls the braking power and also acts as the manual override. As of right now we do not have a plug and play wiring adapter for any brake controller that is confirmed to fit the 2024 model. The same is true for the 2023 model so it seems unlikely there...
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  • Should The Light On The Tekonsha Primus IQ Always Be On
    Your Tekonsha Primus IQ brake controller will remain on to store store your settings. The power draw wouldn't be enough to drain the battery unless you were leaving it sitting for months at a time so you really don't need to worry. If you want to cut the power you can just remove the connector in the back of the controller to cut the power. There are other brake controllers that will shut down the lights the vehicle is turned off, like the Redarc Tow-Pro Liberty Brake Controller # RED24FR,...
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  • Does a 2018 Toyota Highlander Have a Plug In Adapter for a Brake Controller?
    No, there isn't. I checked with our vendors and no one has a plug in adapter for any model brake controller on a 2018 Toyota Highlander because Toyota did not include the necessary port when they manufactured your vehicle. To install the Redarc Tow-Pro Liberty Brake Controller item # RED24FR in your Highlander you will need the Universal Wiring Harness for Redarc Tow-Pro Trailer Brake Controllers item # RED69FR.
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  • Parts Needed to Install Redarc Tow-Pro Liberty in 2023 Ram ProMaster 2500 w/ Tow Package
    Good news for you Stephen - since your 2023 Ram ProMaster 2500 already has the factory tow package, the only things you'll need are the brake controller and wiring harness and you're all set. Here are the exact parts for you: - Redarc Tow-Pro Liberty Brake Controller # RED24FR - Wiring Harness for Redarc Tow-Pro Trailer Brake Controllers # RED69FR This is a splice-in harness, which is needed because your ProMaster doesn't have a port for a brake controller, even with the tow package.
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  • Installation of Redarc Tow-Pro Liberty Brake Controller on 2021 Hyundai Palisade
    The Redarc Tow-Pro Liberty Brake Controller, # RED24FR installed using the Universal Wiring Harness for Redarc Tow-Pro Trailer Brake Controllers, # RED69FR will draw its power from from the black wire on your 7-way RV plug and directly to the negative terminal of your vehicles start battery. We have an excellent installation video created that I have linked below. The blue wire is the brake output signal that goes back to the 7 way - black will be the power source that needs to go to...
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  • Redarc Tow-Pro Liberty Brake Controller Installation On a 2022 Chevrolet Blazer With Factory Towing
    I was able to find the same information as you in the owners manual for your 2022 Chevrolet Blazer that states the 4 blunt wires behind the headlight switch. I was able to find where one person found the wiring near where the brake pedal mounts(see image). Once you find the wiring you will be able to install a Redarc Tow-Pro Liberty Brake Controller # RED24FR with a Universal Wiring Harness # RED69FR.
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    Image 1 for
  • Redarc Tow-Pro Liberty Brake Controller for 2018 2WD GMC Canyon
    Yes, I do agree with your choice it sounds like you have done your research. The Redarc Tow-Pro Liberty Brake Controller item # RED24FR is a great brake controller and would work well for your application. It is a proportional brake controller that works with electric or electric over hydraulic brakes. You will need the Universal Wiring Harness for Redarc Tow-Pro Trailer Brake Controllers item # RED69FR for your 2018 GMC Canyon. The main unit of the brake controller is able to be mounted...
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  • Troubleshooting 3020 Brake Controller Only Sending 5V on Output Wire
    It sounds like you've done everything right when it comes to troubleshooting your brake controller. If you have the gain cranked up all the way and you're still only seeing that 5V coming through the output of the controller then that tells me there is something internal going on with the controller and it needs to be replaced. If it has a lifetime warranty I recommend taking advantage of that, otherwise we have a variety of options to choose from. For a replacement controller I highly...
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  • How Does Redarc Tow Pro Liberty Install in Vehicle with Brake Controller already Wired In
    To install the Redarc Tow Pro Liberty # RED24FR in your 2007 Toyota Tundra that has a brake controller wired in currently you'd need the install harness # RED69FR which has the four wire colors you mentioned and would wire in color for color.
    view full answer...
  • Recommended Wiring Harness to Install a Redarc Tow-Pro Liberty in a 2023 Ford Ranger
    To install a Redarc Tow-Pro Liberty Brake Controller item # RED24FR in your 2023 Ford Ranger you will want to use the Universal Wiring Harness for Redarc Tow-Pro Trailer Brake Controllers item # RED69FR. The 2023 Ranger's do not have a port for a plug in adapter so you will need to manually wire into your truck.
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  • Recommended Brake Controller for a 2005 Kia Sorento EX
    Welcome back! The best option for a brake controller for your 2005 Kia Sorento EX is going to be the Redarc Tow-Pro Liberty Brake Controller item # RED24FR. This is a proportional brake controller that activates your trailer's brakes when your Kia decelerates. The reason the Tow-Pro Liberty is the best option is because of its unique installation method where the only visible portion is the control knob that's about the size of a nickel. The main unit is hidden away inside your dash to...
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  • Troubleshooting Hopkins Agility Reads 10 Followed by 0 When Brakes Applied
    If the power display on your Hopkins Agility brake controller drops from 10 to 0 when you apply the brakes this could mean that you are losing your trailer connection at the 7-way or that your controller is not correctly installed, meaning level and oriented in the direction of travel. Also, this is a proportional controller. If you are attempting to test the brakes with the pedal while stationary it will not work. Check your vehicle socket and trailer plug for any signs of corrosion or...
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  • Parts Needed to Install Redarc Tow Liberty In 2013 GMC Sierra
    Since your 2013 GMC Sierra has blunt cut wires under the dash that get wired to a brake controller the correct install harness you'd need is the part # RED69FR to install the Tow Pro Liberty brake controller # RED24FR. I attached a help article on installing a brake controller on a GM truck like yours for you to check out as well.
    view full answer...
  • Universal Wiring Harness for Use with Tow Pro Liberty Brake Controller
    The universal wiring harness to use with the Tow Pro Liberty part # RED24FR is the part number # RED69FR. This plugs into the module and gives the standard 4 wire brake controller wire setup.
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  • Replacement Brake Controller for a Draw-Tite Activator
    I spoke with my contact at Draw-Tite, and he said that the part number RG 059 that you gave for the Activator isn't a part number. If you are wanting to replace the original Activator then I recommend going with the Redarc Tow-Pro Liberty # RED24FR which installs with the Universal Wiring Harness # RED69FR. This is a simple brake controller that can be mounted pretty much anywhere and uses color coding to let you know the different settings so you don't have to try to remember a bunch of codes.
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  • Is the RedArc Liberty Compatible with a 2012 Chevy Silverado
    The RedArc Liberty # RED24FR is compatible with your 2012 Chevy Silverado 2500 HD and is a good value priced brake controller that will provide with proportional braking for trailers with 2 or fewer axles. I really love RedArc controllers because they install out of the way and provide you with very responsive braking. The only downside of the Liberty is that there are no adapters available that allow for plug and play installation so you'd need to use the Wiring Harness for Redarc Tow-Pro...
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  • Does Redarc Tow-Pro Liberty RED24FR Allow You To Manually Engage Trailer Brakes?
    Yes, the Redarc Tow-Pro Liberty # RED24FR you were looking at does allow you to manually apply the trailer brakes. This is done by simply pressing the control knob, and is useful for correcting trailer sway or if you are off-road and need to apply the brakes of your trailer before the brakes of your vehicle. Now the # RED24FR will get installed into your vehicle with either the Universal Harness # RED69FR or a vehicle wiring harness that would plug into the factory trailer brake controller...
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  • Can I Install a Redarc Tow-Pro Liberty Brake Controller in a 2016 Kia Sorento?
    Yes, the Redarc Tow-Pro Liberty item # RED24FR will absolutely work in your 2016 Sorento. The reason it says it doesn't fit is because you need to purchase the Universal Wiring Harness item # RED69FR to complete your install. There isn't a port in your Kia to plug in the brake controller so you will need to use this harness. I have linked an installation video below that we did on a 2018 Kia Sorento so you can see the process.
    view full answer...
  • Wiring to Install Redarc Tow-Pro Liberty Brake Controller on a 2024 Chevy Suburban
    The Redarc Tow-Pro Liberty # RED24FR will need the Universal Wiring Harness # RED69FR to install on your 2024 Chevy Suburban. This will connect to the OEM wiring under your driver's side dash. I tried looking up the color functions or to find more of a specific location for those wires in the online owner's manual but I was unable to find anything. You'll be looking for a bundle of wires that should be labeled with the functions for a brake controller. Once you find that you'll just have...
    view full answer...
  • Where to Hook Up Red Wire for Redarc Brake Controller on 2017 Toyota Highlander
    The red wire on a trailer brake controller like the Redarc Tow-Pro Liberty Brake Controller part # RED24FR when using the Universal Wiring Harness for Redarc Tow-Pro Trailer Brake Controllers part # RED69FR will need to be attached to the cold side of the brake pedal. In other words, it's the wire that only has power while the brakes are active. The wire will be located inside the bundle of wires that attaches to the brake pedal. It's difficult to get to and even harder to test but required...
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  • Is There a Wiring Harness For a Redarc Brake Controller in a 2023 Jeep Grand Cherokee 4xe Overland
    Unfortunately, we do not currently (4/14/23) have any brake controllers that have a harness available for your 2023 Jeep Grand Cherokee 4xe Overland. To use a brake controller like the Redarc Tow-Pro Liberty Brake Controller # RED24FR, you would need to use the Universal Wiring Harness for Redarc Tow-Pro Trailer Brake Controllers # RED69FR.
    view full answer...
  • Can The Redarc Tow-Pro Liberty Brake Controller Be Installed on 2021 Hyundai Palisade Factory Tow?
    I do have a solution for you to be able to install the Redarc Tow-Pro Liberty Brake Controller # RED24FR on your 2021 Hyundai Palisade with the factory tow package. You will need a Plug-In Wiring Harness # RED69FR to splice into the factory wiring on the connector. The Universal Wiring Harness # RED69FR where you found the images of the Liberty brake controller installed does not have the factory tow package. It uses different components to install the controller.
    view full answer...
  • Wiring Harness For Redarc Tow-Pro Liberty in 2012 Toyota 4Runner
    The correct wiring harness for your 2012 Toyota 4Runner and the Liberty brake controller is the universal splice-in option: - Universal Wiring Harness for Redarc Tow-Pro Trailer Brake Controllers # RED69FR - Redarc Tow-Pro Liberty Brake Controller # RED24FR I verified this with the manufacturer, Redarc, for you.
    view full answer...

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