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Universal Wiring Adapter for Curt Trailer Brake Controllers

Universal Wiring Adapter for Curt Trailer Brake Controllers

Item # C51515
Our Price: $9.21
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Shipping Weight: 0.22 lbs
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This wiring adapter is designed for vehicles that do not come equipped with a factory brake control wiring harness port. One end plugs into your Curt trailer brake controller while the other end splices into your vehicle's wiring. 1-800-940-8924 to order CURT accessories and parts part number C51515 or order online at Free expert support on all CURT products. Great prices and Fastest Shipping for Universal Wiring Adapter for Curt Trailer Brake Controllers. Accessories and Parts reviews from real customers.
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CURT Accessories and Parts - C51515

  • Trailer Brake Controller
  • Wiring Adapter
  • Plugs into Brake Controller
  • CURT
  • Universal

This wiring adapter is designed for vehicles that do not come equipped with a factory brake control wiring harness port. One end plugs into your Curt trailer brake controller while the other end splices into your vehicle's wiring.


  • Universal wiring adapter eases installation of your electric trailer brake controller
    • No need to wire brake controller directly to your vehicle
  • Wire end splices into your vehicle's wiring
    • Use on a vehicle that does not have a factory tow package or on one that has a brake control harness but is not equipped with a plug-in port
  • Connector end joins with the plug on your electric brake controller
    • Compatible with time-delayed and proportional brake controllers from Curt
    • Simple to plug and unplug control for removal
  • 2' Long, 12-gauge wires have protective covering to deter damage
  • Limited 1-year warranty

Installation of Curt Brake Controller Adapter

To install your Curt 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. Usually when this is done, a port is installed at your dash so that you can easily plug in a brake controller. However, if no port is present, you will have to splice into your wiring.

With this universal adapter, you can install your Curt brake controller without having to wire the controller directly to your vehicle. If your vehicle has a factory tow package, just splice the pigtail end of the adapter into your vehicle's factory brake control harness wiring, and then plug the other end of the adapter into the controller. If your vehicle doesn't have a factory tow package, you'll have to hardwire the pigtail end of the adapter into your vehicle's wiring. Because only the adapter is hardwired to your vehicle, you can unplug and remove your brake controller at any time to transfer it to another vehicle or securely stow it away.

If your vehicle is not equipped with a factory tow package, you will need to purchase additional equipment to ensure that the signals from your brake controller are sent to your trailer's brakes. We recommend's exclusive 7- and 4-way brake control installation kit (ETBC7 - sold separately).

51515 Curt Universal Quick Plug Brake Control Adaptor Harness with Pigtail

California residents: click here

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Customer Reviews

Universal Wiring Adapter for Curt Trailer Brake Controllers - C51515

Average Customer Rating:  4.7 out of 5 stars   (421 Customer Reviews)

This wiring adapter is designed for vehicles that do not come equipped with a factory brake control wiring harness port. One end plugs into your Curt trailer brake controller while the other end splices into your vehicle's wiring.


Worked perfectly with the Curt Spectrum.


I have the Dodge Ram Truck 94 model with factory wire 7 connector plug. This is the truck that many people can't find the blue wire under the dash. 94 model didn't come with a factory wire plug under the dash like later models have. I found the wire tape to the main wiring harness about two inches from the fire wall to the right of the emergency brake paddle. This harness worked great


this went into my VW Touareg which requires the relay modification described in the Technical Bulletin. Because ground and +12V is already present in the harness, instead of running additional cables, I soldered the relay right into the cable, making it a clean plug and play setup which is 100% removable. I also bought the VW housing and wire kit to complete the install


This is a "must have" if your vehicle did not come with a "tow package". If your vehicle does have a tow package try to get the correct wiring adapter and you can just plug it in without having to make wiring connections.



So far, so good!


I can't tell you how much time you saved me. I need a clean wiring no junk connection you hit it out of the park plug and play wires I love it. And the price was cheaper than the local trailer shop that tried to they would have done it
better I seen their work thank you again for the great service and fast shipping.


This was a quick and simple installation. The flat connector cover does not stay on and needs to be redesigned. Does not have enough friction. Generous squirts of Fluid Film keep it from corroding,
The round connector cover is fine.


Wiring up a brake controller can be tricky. Routing the wire from the hitch to the firewall and finding the right wire on the brake are the hardest part, but etrailer will do their best to help.

Consider running the wire inside the car along the door bottom just under the carpet. This avoids problems with the tie-wraps under the car -- there just isn't anywhere to tie wrap under the middle of the car. Use "loom clamps" ordered separately to solve this problem, if you go under the car.

To find the right brake wire without cutting insulation, use the fish wire from the hitch install to contact the end of the wire inside the connector (from the back). Then touch the fish wire with the continuity tester and apply the brake pedal. My brake had a four wire connector and I found the right one on the second try.

If you find a hole in the firewall with a rubber plug in it, don't discard the plug. Make a short slice in it with a razor blade and push the wires through. You may have to work the wires around to get them through the carpet. Be patient.

Be sure to watch all the videos and allow plenty of time, taking a break before you tackle the hard parts. Rest assured that doing it yourself is better than allowing UHaul to cut corners and charge you labor. :-)

If you are doing the hitch install and four-wire harness, those are much easier. If you are installing the hitch alone, be sure to have a magnet wand for when you push the bolt up into the frame rail. If I had it to do again, I would use a little electrical tape to hold the bolts down so a slight bump wouldn't knock them up.

Kent E.


Ive not had any trouble with the hitch or the brake controller. I can tow my tear trailer anywhere I want and the hitch protects my mufflers from damage when I go offroad. Nice extra benefit.


Part functioned as required


Easy installation.


I own a 2008 Chevy Silverado. I ordered the brake controller - C51515 and the universal wiring adapter on Friday and received it on Tuesday. My friend who is a mechanic installed it in about an hour on Wednesday. I towed my camper trailer to Lincoln, NE (about a 5 hour trip) on Thursday and returned on Sunday. After reading the settings instructions, all stops were made smooth and firm. was great and the Curt Trailer Brake Controller is excellent!



I have enjoyed the use of the electric brake controller. The stops are always safe and smooth. Im glad I got it for my truck and Ive never had a problem with it. I just need to get out and use my camper more! The initial contact with was very favorable and I will do business with them again when I need something for my trailers or tow vehicles.


I bought a 7 pin trailer wiring/brake connection for my Dodge pickup. I installed it myself, the instructions were absolutely clear and correct. It was an easy installation. In the year since, I've pulled my trailer (tandem axle, 16') many times. The brakes continue to work perfectly as well as the lights. The connectors are solid, all work just like new. I recommend Etrailer parts and their people 100%!

Howard S.


Still working great. Not any problems. A great product


I had this professionally installed at the trailer rental place so I can't comment on installation but the technician indicated it was fairly simple. It works great!


The right product for the job...if e-trailer makes it any easier their competitors will be out of business!


The Curt Spectrum Brake Controller works great for my 2008 Toyota Highlander. I mounted it on the front of the console armrest compartment behind the cup holders (facing forward). I was easily able to route the wiring out the bottom of the console and access the module under the drivers seat (be very careful installing the pins into the clip, they are very fragile). Then I ran the wires under the bottom edge of the console and out through the fire wall (Be very careful drilling your hole through the firewall. I caused some damage I had to have repaired}.
Also, the help I had from Yolanda, making sure the kits I needed were compatible, was extremely important because I was leaving for a cross country trip later that week. She was wonderful and everything worked great for my trip.
Thank you etrailer. I'm a regular customer and will remain so.


Awesome customer service!! Installed trailer brake control on my 2018 Chevy Colorado . Install was a breeze, control knob is small and out of the way and it works perfectly!


Easy to install and well written installation instructions.


Same shipping took to long


controller wasnt working nbr being helped pl


Nice labeling , must have for not voiding brake controller warranty . Fair price


Works well, I am very happy with it.


I purchased the wiring harness to aid with hooking up the Curt Brake Controller I had previously purchased. The shipment was fast. The product was perfect. The on-line installation video was perfect and allowed me to complete the installation like a professional. I have never purchased anything from .... but should I ever need anything in the future, they will be my first choice.



Perfectly. No issues at all with wiring or controller.


Worked like it should. You might leave the sleeve uninstalled on the 4 wires for the installer to fit. I only needed it for the 2 wires going through the firewall. It was not useful for the ground and switch wire.


Excellent web site with great installation videos and application info.
Easy ordering with good feedback notifications and prompt delivery.
Trailer Brake Controller works very well and as described on your web site. I will do business with you again and recommend you to my auto club.

Charles B.


Worked fine, but sold vehicle 6 months ago.


Spoke with etrailer on the phone, they helped me get the right hitch for my car. The hitch was good quality, and their install video really helped.
They shipped promptly and everything arrived in just a few days.
Great experience.


Made hooking up the Curt Discovery Trailer Brake Controller to our non-wired 1982 GMC 1-ton (without voiding the controller warranty) a snap.

Drew V.


No issues, completely satisfied!

Show More Reviews

See what our Experts say about this CURT Accessories and Parts

  • Troubleshooting Brake Controller Not Allowing Truck To Start
    For your 2014 Chevy Suburban, no plug is present under the dash, but the needed wires are already run. You will connect the brake controller wiring with the vehicle wiring already present under the dash using the Universal Wiring Adapter for Curt Trailer Brake Controllers # C51515. It seems the 2007 to 2013 brake controller wiring was carried over into 2014 for your vehicle. I've attached and article to assist. The issue you are experiencing is most likely because you have a plug that...
    view full answer...
  • When Does Brake Output Circuit of Vehicle 7-Way Have Voltage
    The brake output circuit on a 7-way (5:00 pin) will only have as much voltage on it as the brake controller is sending. Typically this going to depend on the amount of gain selected on the controller and other factors like brake controller style and ramp up speed of the controller. The only time the circuit would have voltage without the brake pedal being applied would be if you had the manual override lever of the controller slid. I attached a couple help articles on brake controllers...
    view full answer...
  • Troubleshooting Curt Brake Controller Installation in 2007 GMC Sierra New Body Style
    First I suggest making sure you are testing the brake circuit pin on your Sierra's 7-way trailer socket. If you refer to the linked photo of a trailer connector you will note the brake controller's output is carried on the pin at the 5:00 position; the ground is at the 7:00 position. If you happened to test the 12V auxiliary power circuit, carried on the pin at the 2:00 position, it will have power at all times. I see that you purchased Curt Universal Wiring Adapter # C51515 which installs...
    view full answer...
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  • White Ground Wire Is Taped To Orange Wire 2009 GMC Sierra 1500 Brake Controller Install
    You want to use the white wire in your photo for the ground. The other orange wire is the CHMSL circuit which stands for center high mount stop light wire. It is not used by a brake controller so you can tape it up and stow it out of the way. You will need 4 wires to install the brake controller, 12 volt power (red and black in your photo), trailer brake output (solid blue in your photo), stoplight circuit (light blue with stripe in your photo) and ground (white).
    view full answer...
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  • Does the Curt TriFlex Brake Controller Need to be Disconnected when Backing Up
    You should not have to disconnect the Curt TriFlex Brake Controller, # C51140, when backing up. Brake controllers are designed to send power to the trailer brakes when you step on the brake pedal. When backing up, you typically step on the brake pedal several times, so many people simply disconnect the trailer connector from the tow vehicle before backing up. The Curt TriFlex brake controller is a proportional brake controller that uses an internal inertia sensor to sense the braking...
    view full answer...
  • Is there a Direct Plug In Port on a 2011 Chevrolet Silverado for Installing a Brake Controller
    For your 2011 Chevrolet Silverado there is not a direct plug in application under the dash that will connect the brake controller and your vehicle. On that generation of Silverados the wiring that connects to the brake controller is established from the factory and is located under the steering column. You will need to locate this wiring bundle, and hard wire your truck wiring to the plug that connects to the back of your brake controller (part # C51515). I have included a helpful article...
    view full answer...
  • Brake Controller and Installation Recommendation for a 2013 Chevy Tahoe
    Yes, the Curt Venturer Brake Controller # C51110 and the install harness part # C51515 that you referenced are a confirmed fit for a brake controller for your 2013 Chevy Tahoe that has a factory 7-way trailer connector. No plug is present under the dash, but the needed wires are already run. You will connect the brake controller wiring with the vehicle wiring already present under the dash. See the attached install video.
    view full answer...
  • Wiring Harness for Curt Spectrum Brake Controller on 2019 Volkswagen Atlas
    The wiring adapter you need to use the Curt Spectrum Trailer Brake Controller # C51170 in your 2019 Volkswagen Atlas is the Universal Wiring Adapter for Curt Trailer Brake Controllers # C51515. This is a splice-in adapter because there is not a plug-in adapter available for your '19 VW Atlas, for the Spectrum or for any other brake controller. I have added links to video reviews for you to take a look at as well.
    view full answer...
  • How Does Brake Controller Install in 2011 Chevy Colorado
    Yes it is that simple! To wire in a brake controller to your 2011 Chevy Colorado only requires you to wire the four wires of the controller to the 4 wires that are present under the dash of your truck. I attached an install video that shows this process on a similar 2015 Colorado.
    view full answer...
  • Brake Control Harness # 51515 Installation Process in 2008 and 2013 Chevrolet Silverados
    The Curt Brake Controller Harness you referenced, part # C51515, can be used for both the 2008 and 2013 model years of the Chevrolet Silverado since it is a universal-fit harness. For your 2013 Silverado you will want to follow the procedure outlined in the linked article. Please refer to the photo provided which shows the vehicle tow package wiring that can be found under the dash. You will connect these wires to the leads on the Curt harness as per the article, using butt connectors...
    view full answer...
    Image 1 for
  • Installing Curt Venturer Brake Controller # C51110 on 2008 Chevy Trailblazer w/ Factory Tow Package
    The Trailblazer doesn't have a connector under the dash, the tow package wiring is four bare wires located under the dash. To access the wires, you'll need to unscrew the under dash panel and locate the wiring harness as shown in the video I linked. To connect your Curt Venturer brake controller, you'd use the # C51515 and use butt connectors to attach to the tow package wires as shown in the video. If your Trailblazer has the 7-way trailer connector, all you'll need to do is attach the...
    view full answer...
  • How Many Wires Under Hood Need Attached On 2008 Chevy Silverado for Brake Controller
    The Curt TriFlex Trailer Brake Controller part # C51140 is an excellent option for a 2008 Chevrolet Silverado when used with the Universal Wiring Adapter for Curt Trailer Brake Controllers part # C51515. The wires under the dash are already ran and labeled for you. Once the wires under the dash are hooked up, all you will need to do is make one connection under the hood in the engine bay. This connection is a red wire to the right of the fuse box which needs to be attached to the M6 stud...
    view full answer...
    Image 1 for
  • Will Tekonsha Wiring Harness # 22114 Work with a Curt Brake Controller and 2015 Ford Transit
    Trailer wiring harness # 22114 will fit your 2015 Ford Transit and it will work with your Curt brake controller. The brake controller will be hardwired in since the vehicle does not have a factory tow package. So instead of using the harness that comes with the kit to hardwire in the controller you would need the Curt version, # C51515, if you don't already have it. I have included some links that will help with the installation. You will be looking at the parts relating to hardwiring...
    view full answer...
  • Curt Wiring Adapter For A Brake Controller Compatible With Vehicles Without A Factory Wiring Plug
    Yes we do, The Universal Wiring Adapter for Curt Trailer Brake Controllers, part # C51515, is designed to work with Curt Trailer Brake Controllers on vehicles without a factory brake control wiring harness. These wires will have to be spliced into your vehicle's existing wiring, so there should be no issue with your 2004 Toyota Tacoma. I have included a product description link, a video installation link, and a video review link below.
    view full answer...
  • Recommended Brake Controller and Adapter for a 2009 Toyota Tundra w/ the Factory Tow Package
    Since your 2009 Toyota Tundra has the factory tow package, you will want the Curt Custom Wiring Adapter item # C51362. This adapter will plug into a port which is under the dash to the left of the steering column. You will be able to use this adapter to install the Curt Spectrum Trailer Brake Controller item # C51170 without having to cut or splice wires. The Universal Wiring Adapter for Curt Trailer Brake Controllers item # C51515 you referenced, is for vehicles without the tow package....
    view full answer...
    Image 1 for
  • Plug and Play Brake Controller Recommendation for 2020 GMC Savana Van
    While there is no plug and play custom adapter available for your 2020 GMC Savana Van, I do have an option that would not require any cutting or splicing into your vehicle's wiring. Take a look at the Curt Echo Wireless Trailer Brake Controller # C51180. It's definitely a more expensive option, but it's the only brake controller available that uses Bluetooth technology to wirelessly allow you to monitor and control your trailer's braking activity. It's also proportional, instead of time...
    view full answer...
  • Compatibility of Curt Discovery Brake Controller With 2010 Chevy Silverado
    Brake controllers are not vehicle specific. The # C51120 Curt Discovery brake controller is compatible with your 2010 Silverado. You'll also need the Universal Curt Brake Controller Pigtail, part # C51515. The pigtail wire will connect directly to the tow package wiring located under the dash between the steering column and the emergency brake pedal. Look for a bundle of wires with a white tag hanging from it. The wires of the pigtail will connect to the tow package wiring as follows: Red...
    view full answer...
  • Does the Curt Spectrum Work with Adaptive Cruise Control and Safety Emergency Braking
    The Curt Spectrum # C51170 is a proportional brake controller, meaning that the brakes on the trailer are applied in proportion to the amount of inertia sensed by the slowing of the vehicle. So to answer your question, it's going to sense small slow downs and lightly apply the trailer brakes, but will also respond when you brake the vehicle using the brake pedal and apply the brakes on the trailer as well. This is going to work regardless of whether you've got the adaptive cruise control...
    view full answer...
  • Installation of Curt Venturer Electronic Brake Controller in 1999 Chevrolet S-10
    To install the Curt Venturer Electric Brake Controller # C51110 you definitely need the red wire. Black to 12 volt power White to ground Blue to 7-way at rear of vehicle Red to cold side of the stop light switch The cold side of the stop light switch will have power only when the brake pedal is pressed. The red wire carries the signal from the brake pedal to the controller so it can send a signal on the blue wire to the trailer's brakes. The wiring harness to hardwire into your 1999...
    view full answer...
  • Adapter for Curt Venture Brake Controller on VW Touareg
    In order to use the Universal Wiring Adapter for Curt Trailer Brake Controllers # C51515 with your Curt Venturer # C51110 brake controller, you will need additional parts from your Volkswagen dealer. Please see the attached help article on installing a brake controller in 2005 and up Volkswagen Touareg's. It states in part: "To install a brake control on a 2005-current Volkswagen Touareg or Porsche Cayenne using the factory brake control connector, you will need to assemble a brake control...
    view full answer...
  • Do I Need a Brake Controller for a 2007 Chevy Tahoe with Tow Package Towing a 2017 Jayco Baja
    Assuming your trailer has brakes, you may still need a brake controller. GM started putting factory brake controllers in their trucks and SUVs in 2007, but it was an option. The factory brake controller did not come standard with the tow package. If you have a factory brake controller, you will see a black square with a horizontal lever and two buttons (+ and -) just below your light controls to the left of your steering wheel. If you don't have that, then you will need to add a brake...
    view full answer...
    Image 1 for
  • Installing a Brake Controller in a 2009 Chevy Suburban
    The 2009 Chevy Suburban does not have a port to plug in a brake controller which is the same as the trucks of the same year. But it does have the tow package wire bundle up under the dash, to the left of the steering column, held together with a white tag. Pull the wire bundle out to wire in a brake controller. With Curt brake controller # C51120 you will also need pigtail # C51515. Then you can make the following connections: Vehicle red/black wire to controller black wire for 12 volt...
    view full answer...
  • Will The Curt TriFlex Trailer Brake Controller # C51140 Work as a Replacement For Old Tekonsha?
    Yes, the Curt TriFlex Trailer Brake Controller # C51140 can be used to replace the Tekonsha controller in your 2002 Dodge Ram 1 ton pickup. I do recommend wiring in the Pigtail # C51515 so you will be able to easily disconnect the controller in the future. This will help in the event you have a wiring issue down the road or wish to move the controller to a new truck.
    view full answer...
  • Curt Triflex Brake Controller and Wiring Adapter Recommendation for a 2006 Jeep Grand Cherokee
    The easiest way to order the Curt Triflex part # C51140 that you referenced and get the correct wiring adapter part # C51515 would be to just order both the part numbers separately. If you are on the multi-product page that shows both part numbers listed next to each other when you hit add to cart both part numbers will be in the cart. These two parts would work well in your 2006 Jeep Grand Cherokee, I attached an install video for you to check out also.
    view full answer...

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