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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

Part Number: C51342
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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 junction box beneath your vehicle's dash. 1-800-940-8924 to order CURT accessories and parts part number C51342 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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CURT Accessories and Parts - C51342

  • 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 junction box 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 electric junction box 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.

Junction Box on VehicleBrake-Control Adapter Port

This adapter plugs into the port that is built into the electric junction box beneath your vehicle's dash. The black box is located to the left of the steering column, just above the carpet. To plug in the adapter, first remove the cover on the box. The adapter plugs into the second slot from the left, on the top row.

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.

51342 Curt Quick Plug Brake Control Adaptor Harness

Installation Details C51342 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 - C51342

Average Customer Rating:  4.8 out of 5 stars   (56 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 junction box beneath your vehicle's dash.

2000 Chevrolet Silverado

Trailer brake controller was very easy to install and works great with my trailer.

2001 Chevrolet Silverado

Wire harness fit perfectly. Delivered quickly and great price. Also the video from Etrailer on how to install the entire unit was spot on.


Easy install with factory 7way plug didn't need any extra not included in kit. 02 Chevrolet 2500HD and pull an aluminum 3 horse gooseneck trailer, this brake system works great so far loaded and unloaded. Mounted nicely out of way to the dash under shifter.



Im still very happy with the product i purchased. Works great!! I pull a 3 horse gooseneck aluminum trailer behind my 02 Chevy 2500 4x4 and have no problems stopping even fully loaded down.. thank you for checking in with me..


Works as it should !


No problems. Plug and play.


I purchased a Curt brake controller from the Chevy dealership and when it arrived it was a controller and a hand full of wires to splice into my system. I got a hold of etrailers and the staff was pleasant and sold me what I actually wanted from the dealership. Now I know to call these guys for all my trailer wiring needs.


brake ontrol works great and better
then the one I had before. The plug I got for the truck just pluged right in and I was all set to go. very happy with its performancw.



works great no problems


I bought the brake controller and wore harness it came fast and was super easy to install and used it the next day to tow my at and trailer and it worked perfect I would deffinitly recommend this brake controller to anyone it's a great but for the low price

2002 Chevrolet Avalanche

This made installing my Trailer Brake Controller a breeze. I had a harness already that came with my truck, but would have to get the connector and pins to put on it to mate it up to the controller. This was already done and ready to go. 2 minutes time to installt he brake controller and have it ready to go.


Well built wiring adapter for brake controller plugged into fuse box two screws for new brake controller , done in ten minutes and tested on the road with trailer ..Whole install and op's check took 30 minutes..


A good product for the price. etrailer has always been great to order from, product ratings, instructions, fast delivery, and variety.



Great product for the price, works great.

Land Rover Discovery II

Ordered this due to wrong harness coming with brake controller. Haven't installed yet but looking at the harness looks like it will work as intended. Plugs directly into the Curt Discovery controller I received. Thanks

2002 Chevrolet Silverado

worked great. the web sight my daughter bought her controller from did not show that she needed this adapter harness but etrailer web sight did. bought the harness separate and installed in seconds. that's why I tell her I like etrailer.


It was EXACTLY want I needed - didn't have to cut wires or anything. Simply plug and play. Great offer by etrailer to provide this adapter. Great product, great service, great price rate, fast delivery - what else can you ask for?


I have not had the opportunity to install my latest purchase but I am extremely satisfied with all my purchases from etrailer as to the correct part being sent and full instructions for installation. Please keep up the good work and I am so glad for the free shipping of my purchases.
Thanks, Al H


Great product, easy install with with the wiring adapter. etrailer is the best, fast shipping and helpfull information


I got kit witch should of had a square end but they sent a flat hook-up wouldn't fit so I had to re-order right one$2.89 shipping ,plus had to wait to hook -up would buy from again but would talk to some body before I order great fit work when plugged in


Made brake controller installation a breeze. 5 minutes and done. completely plug and play on wiring.

Chevrolet Tahoe

Worked great on my Tahoe with oem installed trailering package


Worked perfectly. I had my brake controller installed in minutes.

2002 Chevrolet Silverado 1500

Fits my Avalanche 1500 perfectly. Thank you

Tanya G.


Still works great!!!!


Works awesome hooked right into my truck it took longer putting the screws in than it did anything else. Very happy and stops trailer with ease. just what i needed for the heavy loads.

2002 GMC Sierra

This product made hooking up a trailer brake unit very simple. I would recommend this to anyone looking to set up a trailer brake unit.

Chevrolet Silverado 1500

The brake controller for my Chevy 1500 HD was simple to install with the easy to follow instructions. It works great.


Super easy to install, can't believe I paid to have brake controller installed on all my previous trucks!

Show More Reviews

See what our Experts say about this CURT Accessories and Parts

  • Wiring Harness to Plug in a Curt Venturer Brake Controller to a 2002 GMC Yukon XL Denali
    We certainly do! For your 2002 GMC Yukon XL Denali you will need wiring harness # C51342 to plug in your Venturer brake controller # C74VV. I have included a link to a video review of the harness for you.
    view full answer...
  • Brake Controller Installation on 1999 GMC Pickup
    It will depend on which truck you have. 1999 was a split model year for GMC pickups. They offered both the C/K series which was a carryover from the 1998 model or the Sierra which was an all-new body style. If you have the C/K series, the vehicle isn't prewired for a brake controller. You'll need to begin with a functional 4 pole trailer connector. You can install # 118315 if you don't already have one. Then, to install a 7-way trailer connector and install the brake controller, you'll...
    view full answer...
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  • Curt Brake Controller Not Working Correctly After Moving It From 2006 Silverado to 2001 Model
    If you are using the same wiring adapter in the 2001 as you had in the 2006 Silverado, it would explain the problem you're having. Both model years use the same plug, but after the 2002 model year, GM changed the pinout on the connector under the dash. The 2006 Silverado uses the # C51352 wiring adapter, while the 2001 model would use the # C51342. I've edited a photo for you showing the difference between the two connectors, you can move the red wire to the correct location by removing...
    view full answer...
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  • No Power to Trailer Connector on 2002 Chevy Suburban with Curt Trailer Brake Controller
    On certain model year Chevy and GMC trucks and SUVs there are some connections that need to be made under the hood to make everything fully functional. It happens on vehicles with or without the factory tow package. Basically, it sounds like the power output to the trailer connector from the brake controller is not run. You will need to manually run it from where the wire terminates under the hood to the back of the 7-Way in the 7 oclock position. You can use wire # 10-1-1 sold in increments...
    view full answer...
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  • Troubleshooting Curt Venturer Trailer Brake Controller on 2002 Chevrolet Silverado
    It sounds like the wiring harness under the dash of your 2002 Chevrolet Silverado does not have power running to it. To test this, use a circuit tester like # PTW2993 to check the connector. If this is the problem, you will need a Universal Wiring Kit for Brake Controllers # C51500. The install instructions are attached. You'll also need to modify the factory harness in your truck a bit. On the factory harness cut the battery wire leading to the factory connector leaving enough room...
    view full answer...
  • Troubleshooting a Curt Discovery part # C84VV Not Working on a 2002 Chevy Silverado 1500
    On certain model year Chevy and GMC trucks and SUVs there are some connections that need to be made under the hood to make everything fully functional. It happens on vehicles with or without the factory tow package. I checked your order notes and you also bought the Curt Wiring adapter part # C51342. To see what under the hood connections need to be made check out the link I provided to the right that details everything you would need to install a controller like the Curt Discovery part...
    view full answer...
  • Curt Venturer Brake Control Applies Full Power to Trailer Brakes All the Time on 2000 GMC Sierra
    The first thing to check is the wiring harness # C51342 for your 2000 GMC Sierra. Specifically, check the location of the red wire on the end that plugs into the truck. Make sure it is in the same location as the one in the picture. If not, or if any of the wires are in different locations, move them to the correct locations according to the picture. Make sure the controller is mounted within the range specified in the instructions, linked to the right for reference. If it is outside of...
    view full answer...
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  • Installing Curt Tri-Flex Brake Controller on 2002 Chevy Silverado 2500
    Brake controllers are not vehicle specific, but their wiring adapters are. The # C51342 wiring adapter would be the correct adapter for installing a brake controller into your 2002 Silverado. The adapter would plug into the convenience center under the dash as shown in the help article I linked you to. If your Silverado has the OEM 7-way, all you should need to do is plug the controller into the convenience center and attach the mounting bracket to the underside of the dash. If not, you...
    view full answer...
  • Troubleshooting Curt Brake Controller Installation in 1990 Chevy Silverado
    If your brake controller is a time-delay type like the Curt Venturer # C74VV it should activate the trailer brakes either when you press the brake pedal or press the manual override lever. But if you have a proportional type controller like the TriFlex # C24VV, which is triggered by inertia (from the motion of your truck) then the brake pedal will activate it ONLY if you are moving. With both types of controller the manual override lever should activate the brakes to the selected power...
    view full answer...
  • Parts Needed to Install Curt Triflex Brake Controller in a 2002 Chevy Suburban
    All you need to install the Curt Brake Controller part # C24VV in your 2002 Chevy Suburban with the factory 7-way is the install harness part # C51342 that you referenced. This harness plugs into the port under your dash and it will be fully active and ready to go once you mount it.
    view full answer...
  • Parts Needed to Install Brake Controller in 2000 Chevy Silverado 1500
    To install the Curt Echo Under Dash part # C27JR in your 2000 Chevy Silverado 1500 you'd need the install harness part # C51342 which plugs in under the dash. If you were wanting something a little more economically priced you'd want the Brake EVN part # TK63VR with the install harness part # 3025-P which works great and is very reliable.
    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 Wilson B
Updated by:
Wilson B
Employee Kristina F
Updated by:
Kristina F
Employee Isabelle B
Updated by:
Isabelle B

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