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  5. Plugs into Brake Controller
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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 # C51451
Our Price: $13.44
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Shipping Weight: 0.26 lbs
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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 controller and then plug the other end into the built-in port beneath your 's dash. 1-800-940-8924 to order CURT accessories and parts part number C51451 or order online at Free expert support on all CURT products. Great prices 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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2021 GMC Yukon - Curt Custom Wiring Adapter for Trailer Brake Controllers - Dual Plug In

  • 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 controller and then plug the other end into the built-in port beneath your '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 port is located in the wiring panel underneath the dash, to the left of the steering column, 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.

51451 Curt Quick Plug Brake Control Adaptor Harness

Installation Details C51451 Installation instructions

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Curt Custom Wiring Adapter for Trailer Brake Controllers - Dual Plug In - C51451

Average Customer Rating:  4.8 out of 5 stars   (152 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 controller and then plug the other end into the built-in port beneath your vehicle's dash.


Perfect fit just plugs in…nothing to it!


Thanks to etrailer foor the quick tutorial on where to plug it in at!


I’m not sure if this part is good or not because it is part of a trailer brake choice that doesn’t work well. It is possible that this is the problem, but no one seems to be able to tell me what the problem is.

2015 Chevrolet Silverado

After talking at length (at least 15 minutes) to the rep on the phone, I choose the Curt TriFlex controller for my 2015 Silverado. It happens to be the same unit sold on Chevy's website (but cheaper on etrailor). The sales person was awesome! She wanted to be sure I got the right one, not trying to upsell me on something I didn't need. Just as she promised, it plugged right in under the dash and I even used an existing screw to mount the bracket. A 15minute install!!! I will shop here again.


Works great. Easy to follow online installation instructions for the wiring adapter - no problem!

Bob B.


It works just fine, no problem at all.


The screws for the bracket did not fit into the plastic bushings in the bracket. I have got hooked this up to a trailer with brakes, yet, but everything else seems to work, including the adapter for my Silvy1500. Note that this review bears no negativity on etrailer, but he manufacturer of the brake controller. Stop letting China manufacture our goods and get better product reviews. I have had good experiences with, they always ship fast and deliver quality installation guides. Kudos to them!


It was a very simple install. Only problem I had was getting my fat fingers in the right position to install the adapter harness into place. Took maybe 3 minutes though. Web site said it wasn't compatible with my truck, so I called. After a short wait Jesse came on. He was extremely patient as I explained my problem and had me fixed up in just a few minutes. The shipment arrived 2 days early wich is rare these days. Very pleased for sure.


This thing does everything you could ask a trailer brake controller to do. Easy to install, easy to adjust, and performs flawlessly. And it is priced right where it should be.

2014 Chevrolet Silverado 1500

This is my first order with . The Curt Custom Wiring Adapter was as advertised and came on time as promised.
I had shopped around at All the big three auto parts places (except "NAD*) only to get the same answers: "You have to splice those things to mak'em work"....cost could be around $50-150 bucks" OR " We can't get the connectors from our company". This was not true.
Glad I found " . Thank You ALL. :)

2015 Chevrolet Silverado 1500

The controller arrived quicker than expected along with the wiring harness. Installation, with your instruction, was painless and simple.

I choose to use velcro to mount my accessories, and in the pictures you can see this is a simple fast method. Plus, I can always remove it easily if need be.

Great product, great support, great prices.


2014 GMC Sierra

I recieved this brake controller order on time. I installed it in my 2014 GMC Sierra in about 30 minutes. It work fantastic. I am extremely happy with my purchase from Etrailer.


Just the right length, plug and play


I love this product. I have had many tow vehicles over the years. Wiring a brake controller always took a little time. This plug in device makes the job simple.
It and etrailer both deserve 5 stars.



Don't get much easier then this. The installation video was top notch , easy to follow and accurate. Thank you E-trailer

Ray L.


Great product great company!!!

2002 Chevrolet Silverado

Ok, I just found a package from you guys on my porch when I got home. I'd gotten an email today that said it'd been delivered, but I KNEW that was a mistake because I'd just ordered a couple days ago, paid ZERO for standard shipping, so was certain there was no way anything got here already. Get home, it's ALL there!!!!! It's all exactly what I ordered, and I'll be providing reviews of the stuff as I get it installed and used. But as for etrailer? Nothing but awesome!!!!!!!!! Amazing job. Now THAT'S customer service!

2015 GMC Sierra 1500

Excellent product, made hooking up my brake controller super easy and fast.
Fast and easy ordering from etrailer good people to deal with.




2014 Chevrolet Silverado

E-Trailer had exactly what I needed for my new model year vehicle that I couldn't find elsewhere. The product was accurately described and the installation manuals were available online which helped tremendously in making a purchasing decision. The order was placed on a Sunday and a shipping notification was received on the same day literally minutes after the order was placed. Item was received within 3 days...can't ask for better than that.

I have bookmarked this site for future business...very efficient.


Easy installation for brake controller only Con was there were no instructions provided as to where on the fuse block to plug it in. Had to research website for info. Mirrors fit perfect and allow to see rear of 26 ft trailer for up coming traffic

2015 Chevrolet Silverado

The connector was part of a kit which included the trailer brake. Everything worked as advertised. Plug and play in my 2015 Silverado.

2015 Chevrolet Silverado 1500

Excellent delivery time. Easy to install. All the parts were included to make it a professional easy installation. No problems and the Curt wiring adapter was a good investment to insure a professional job.

2015 Chevrolet Silverado 1500

Must have "accessory" for the brake controller. Made install a snap. YouTube video was very helpful in locating the vehicle's plug in.


Perfect fit and made the Curt brake controller install quick and painless.


After waiting for almost 1 month I finely received my order had too return one order that was not mine and had to wait until I got instructions on returning it. I have placed 3 different orders with etrailer but the last one was a mess, I don't known where you get the people that work in shipping but I think that a 4 year old could do a better job also when you have a complaint U wind up talking too four or five different persons and no one knows what you are talking about the only person that was of any help was Kim P thanks young lady


Totally worth adding this to the purchase of the controller. Cut the installation time and messing around with wiring or splicing ends together


So far all products have been installed. I am quite satisfied. My only worry is the brake controller. Time will tell. Thanks for prompt service.

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