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Curt Custom Wiring Adapter for Trailer Brake Controllers - Dual Plug In

Curt Custom Wiring Adapter for Trailer Brake Controllers - Dual Plug In

Item # C51392
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Install your Curt electric trailer brake controller quickly and easily with this custom wiring adapter. Simply plug one end of the adapter into your brake controller and then plug the other end into the built-in port beneath your vehicle's dash. 1-636-306-4830 to order CURT accessories and parts part number C51392 or order online at Free expert support on all CURT products. Guaranteed Lowest Price and Fastest Shipping for Curt Custom Wiring Adapter for Trailer Brake Controllers - Dual Plug In. Accessories and Parts reviews from real customers.
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  • Reviews (30)
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CURT Accessories and Parts - C51392

  • Trailer Brake Controller
  • Wiring Adapter
  • Plugs into Brake Controller
  • CURT
  • Vehicle Specific

Install your Curt electric trailer brake controller quickly and easily with this custom wiring adapter. Simply plug one end of the adapter into your brake controller and then plug the other end into the built-in port beneath your vehicle's dash.


  • Plug-in wiring adapter allows for quick, simple installation of your electric trailer brake controller
  • No cutting or splicing required
    • Custom connector end plugs into the built-in port beneath the dash of your vehicle
    • Other end plugs into the back of your electric brake controller
  • Compatible with time-delayed and proportional brake controllers from Curt
    • Brake controller must have built-in plug for adapter to connect - will not work on controllers with pigtail wiring harnesses
  • 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. 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 port on your vehicle's built-in brake control wiring harness. The harness is located underneath the dash, to the left of the steering column, and it is taped to another harness near the emergency brake pedal.

No hardwiring is required to install this adapter. After you plug it into the factory port, you simply plug the other end of the adapter directly into your electric trailer brake controller. Because there are no wires to connect, installation is not permanent. You can unplug and remove your brake controller at any time to transfer it to another vehicle or securely stow it away.

51392 Curt Quick Plug Brake Control Adaptor Harness

Installation Details C51392 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Reviews

Curt Custom Wiring Adapter for Trailer Brake Controllers - Dual Plug In - C51392

Average Customer Rating:  4.9 out of 5 stars   (30 Customer Reviews)

Install your Curt electric trailer brake controller quickly and easily with this custom wiring adapter. Simply plug one end of the adapter into your brake controller and then plug the other end into the built-in port beneath your vehicle's dash.


The Curt Custom Wiring Adapter for the 2017 Honda Ridgeline worked perfectly for the installation of my new Curt Spectrum Trailer Brake Controller. Thanks etrailer!Thanks Curt!

The Curt Spectrum Trailer Brake Controller has been working flawlessly. I am pleased that the custom harness made the install so simple.
Michael - 09/08/2021


Perfect adapter so you don’t have to splice into your wiring

2018 Ford Transit Connect

Installed the Curt Triflex in 2018 Honda Ridgeline RTL-E and was completely easy with the C51392 Honda specific wiring adapter that plugged into the Honda pre-wiring just above and left of the emergency foot brake as you look at the pedals. Like how the controller fits nicely in front of the shifter flat on the center console storage tray with a bit of Velcro to hold it and prevent movement in transit and matches the black interior trim well (didn't use the metal bracket that came with it). Have had great luck with Curt products (hitches, adapters, etc.) and this product is very well thought out. Too early to tell about long term use though.

2019 Honda Pilot

This part is listed to fit a 2019 Honda Pilot. I needed one for a 2019 Honda Passport;(basically the same vehicle); however since the Passports just came out in about February no one could tell me if it would work on the Passport. So I took a gamble and ordered this wire. Well I can confirm that this part does work on the 2019 Honda Passport. The hardest part was reaching the plug under the dash and getting this wire to plug into it, all without any room and only being able to get one hand up under dash. Wire made hooking up brake controller a lot easier than direct wiring.

2019 Honda Pilot

This fit my 2019 Honda Pilot perfect. Plugged right in under the dash. The plug branches out of another wiring harness directly above your OBD plug in. On the left side of dash. You will have to lay down and get your head near the pedals to see it tucked up in there. Very easy install, glad I went with etrailer. Made it simple.


Just finished the install. It was nice to be assured that I had everything I needed to finish the job before I got started. Honda didn't make it easy.


Perfect fit


Everything about the buying experience has been great! I was impressed with the email communication and the actual phone call to let me know that my ordered had been shipped out. I will be using the website again to make purchases for my trailer and camper accessories! Thanks!

2009 Honda Pilot

The adaptor cable fit perfectly into my Honda Pilot and I had no issues with it what so ever. Great technical help is also available from etrailer. I've purchased from them before and they always do a great job.

2013 Honda Pilot

Worked great I installed my brake controller in new truck in no time. On line instructions were great workout perfect.


Great no problem

Reynaldo S - 08/06/2020

Honda Ridgeline

Delivered faster than advertised. Took me much, much longer to FIND the Ridgelines connector. Once I going that, it took about 25 minutes to put on and secure the wires


This is a great product. It took about 10 minutes to install with the well illustrated instructions showing exactly what needed to be done. Plug and play and on the road!

2011 Honda Pilot

Fast shipping simple to install on my ridgeline and pilot exact fit with the pig tail


Fairly easy to set up. Works well.


I was surprised - completely plug and play! Easy to install


excellent connector. Just the right le ngth


Purchased this controller for limited use.
like the vehicle specific plug adaptor that came with it. Makes for a quick clean install.
Clean compact design and easy to use.


I haven't installed it yet, but the transaction was easy and received product right away.

It has worked great
Mike S - 10/16/2018


Made this really easy


What can you say looks good


Makes the install a breeze.


Great product and fast service.


Perfect fit.


Show More Reviews

See what our Experts say about this CURT Accessories and Parts

  • Install Harness for Curt Triflex for 2019 Honda Pilot with Factory 7-Way
    Since you are having a factory 7-way installed on your 2019 Honda Pilot all you need to install the Curt TriFlex part # C51140 is the install harness part # C51392 since you'll have all of the factory wiring needed to install.
    view full answer...
  • Recommended Brake Controller and Pigtail For 2020 Honda Pilot With Factory 7-Way
    Great news Tom! There is a pigtail that you can use with the 2020 Honda Pilot to use the Curt Spectrum Trailer Brake controller part # C51170. You will need the Spectrum along with pigtail part # C51392 as confirmed by Curt which will plug into a port under the dash to install the brake controller. The Curt Spectrum is a great choice for the Honda Pilot because of it's dash-mounted control knob that can be installed anywhere in the cab (with reachable access) so it's discreet and looks...
    view full answer...
  • Curt Spectrum Brake Controller for 2020 Honda Ridgeline
    For the Curt Spectrum Trailer Brake Controller # C51170 to be installed on your 2020 Honda Ridgeline, you will also need Wiring Adapter # C51392. The wiring adapter will allow you to plug directly into the Honda connector so that you will not need to splice into the factory harness.
    view full answer...
  • Install Harness for Curt Assure Brake Controller for 2021 Honda Ridgeline
    To install the Curt Assure brake controller part # C49UR in your 2021 Honda Ridgeline the correct install harness is the part # C51392. The other harness was designed for other vehicles and not yours.
    view full answer...
  • Brake Controller Wiring Adapter For 2020 Honda Pilot EXL Model Installing RedArc RED44FR
    The Curt Custom Wiring Adapter for Trailer Brake Controllers - Dual Plug In # C51392 is listed as a confirmed fit on the Curt site for the 2020 Honda Pilot EXL. Included is a review video with additional information as well.
    view full answer...
  • Recommended Brake Controller and Wiring Harness for 2019 Honda Ridgeline
    For your 2019 Honda Ridgeline, the Curt Custom Wiring Adapter for Trailer Brake Controllers - Dual Plug In # C51392 is a confirmed fit. The installation will be under the dash, left of the steering column and near the emergency brake pedal. I recommend pairing this with the Curt Spectrum Trailer Brake Controller # C51170 for a really clean dash and easy function. I've attached a video to further assist.
    view full answer...
  • Do All 2019 Honda Ridgeline Have Factory Tow Package Wiring
    The 2019 Honda Ridgeline is pre-wired to attach a 7-Way plug that powers trailer brakes but not all Honda Ridgelines have the wiring harness for a plug and play brake controller adapter. If you need a 7-way I recommend to use Tekonsha T-Connector Vehicle Wiring Harness with 7-Way Trailer Connector part # 118288 which will plug into a port behind the rear bumper. It also comes with the relays needed to activate the tow package on the Ridgeline so power the circuit needed on the 7-way needed...
    view full answer...
    Image 1 for
  • Troubleshooting Trailer Error When Using Curt Echo Under-Dash Controller on 2020 Honda Ridgeline
    Thank you for all of the info! The Curt Echo Wireless Trailer Brake Controller # C51180 just requires the trailer lights and 12V power pin to operate properly but the Curt Echo Under-Dash Trailer Brake Controller # C27JR and Custom Wiring Adapter # C51392 require your 2020 Honda Ridgeline to have the tow package so all of the wiring exists on your 7-Way - especially the brake control pin in the 5 o'clock position (see attached). If you grab a tester and put it on that pin and then apply...
    view full answer...
    Image 1 for
  • Time-Delayed Brake Controller Recommendation for 2014 Honda Ridgeline
    If your trailer uses electric brakes and if your 2014 Honda Ridgeline has a factory 7-way trailer connector at the back, then you can use a time-delayed type brake controller such as the Curt Venturer # C51110 along with a quick-connect wiring harness # C51392. The link provided will let you see all time-delayed units offered. Time-Delay type brake controllers do not require the careful mounting angles of proportional types (which use internal sensors to determine braking level) so they...
    view full answer...
  • Troubleshooting Lack of Brake Controller Power on 2019 Honda Ridgeline with Custom Harness
    The Curt Spectrum Trailer Brake Controller - 1 to 4 Axles - Proportional - Dash Mount # C51170 along with the Curt wiring adapter # C51392 is a confirmed fit for 2019 Honda Ridgeline according to the manufacturer. You can use a circuit tester like # PTW2992 to check for the 12V power on that harness. If you have power you should have lights unless there is a connection issue. Look for bent pins reconnect. Then in engine compartment look at fuse box B located by the brake fluid reservoir....
    view full answer...
  • Length of the Curt Spectrum Brake Controller Wiring
    The Curt Spectrum Trailer Brake Controller # C51170 has a wiring harness that is 48 inches long between the knob and the concealed box. I reached out to the manufacturer to confirm that measurement for you. If you have the factory 7-way on your 2016 Honda Pilot then you will simply use the Custom wiring harness # C51392 which has a 24 inch length to connect your controller to your factory wiring harness. If you do not have the factory 7-way, then you will want the universal wiring harness...
    view full answer...
  • Can I Use the Curt Discovery Brake Controller in a 2021 Honda Pilot
    Yes. You could use the Curt Discovery # C51120 on your 2021 Honda Pilot with the plug and play adapter # C51392 to allow for an easier installation that won't require cutting into any wiring. However, the Discovery is a time delayed brake controller, which means that it applied the brakes with the same intensity and with a slight delay in response to the tow vehicle's brakes being pressed. I do typically recommend going with a proportional brake controller, which uses gyroscopes and sensors...
    view full answer...
  • Brake Controller for a 2012 Honda Pilot
    There are a lot of options for brake controllers on the market that work with your 2012 Honda Pilot. The Curt Venturer Trailer Brake Controller # C51110 is a basic time-delayed controller that mounts in the cab of your vehicle. With a time-delayed controller, both the amount of braking power and rate of application can be adjusted to suit your preference, but these settings will be constant once you set them. The installation difficulty and additional parts needed depend on what kind...
    view full answer...

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Info for this part was:

Employee Leah B
Edited by:
Leah B
Employee Lindsey S
Written by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Wilson B
Updated by:
Wilson B
Employee Kristina F
Updated by:
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Employee Isabelle B
Updated by:
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