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Curt Discovery NEXT Trailer Brake Controller - 1 to 4 Axles - Time Delayed
Curt Custom Wiring Adapter for Trailer Brake Controllers - Dual Plug In

Part Numbers: C84VV,C51525

Retail:$158.40
Our Price: $116.81
You Save: $41.59
Trailer Brake Controller

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Curt Discovery NEXT Trailer Brake Controller - 1 to 4 Axles - Time Delayed
part number: C84VV

An easy-to-read digital number display, 10 power levels, and a pinch-trigger manual override make this time-delayed brake controller easy to use. Installation is simple with no mounting restrictions. Activates brakes with a preset intensity.

Features:

  • Brake controller activates trailer brakes with preset intensity
  • Adjustable power output control lets you select the amount of braking force
    • Rocker switches located on left front of module for easy access
  • 10 Gain settings and 9 load settings allow you to adapt to various driving conditions
    • Select a higher setting for harder braking and lower for more gradual braking
  • Pinch-trigger manual override is within easy reach for controlling trailer sway or stopping in emergencies
  • Simple LED display shows the amount of power output
    • Self-diagnostics monitor trailer connection and check for shorts
  • LCD display shows power adjustments in 0.5 increments
    • Brightness is adjustable for optimal visibility
  • Auto-sleep mode prevents battery drain after 5 minutes of idle time
  • Quick and easy installation with no mounting restrictions
    • No need to mount level - install anywhere at any angle
    • Included mounting bracket and hardware designed to hold the brake controller flush against the dash
    • Plug-in, vehicle-specific brake control adapter (sold separately) available for select vehicles to reduce installation time


Specs:

  • Application: trailers with up to 4 axles (8 brake assemblies)
    • Compatible with low-volt, PWM, ABS, cruise control, and electric-over-hydraulic trailer brakes
  • Dimensions: 4" long x 3-1/8" wide x 1" tall
  • Limited lifetime warranty


Gain Adjustment

Gain control lets you set the maximum amount of power that will be applied to your trailer's brakes, adjusting in increments of 0.5. How much braking output you need is determined by the weight of your trailer; a heavier trailer will need more power to bring it to a stop. You want to go as high as you can without the trailer brakes locking up. Typically, the gain is only readjusted when you experience changing road conditions or if the weight of your trailer changes. To get more power to your brakes, press the upper orange rocker switch. To decrease the gain, press the lower switch. When you make your adjustment, the gain setting will show on the LED screen for 10 seconds as a series of bars and then go into sleep mode.


Load Control

Once you have the gain set, you can fine-tune your braking by adjusting the load control on a scale of 1 to 9. This controls the aggressiveness of your trailer's braking, meaning how quickly the brakes reach the maximum braking level. Load control can get the braking power to your trailer faster and with more intensity so that it doesn't push your tow vehicle forward. If your vehicle takes too long to come to a stop, increase the setting by pressing the upper black rocker switch. If it stops too abruptly, decrease the setting by pressing the lower switch. You can alter the setting to suit your driving preferences or to improve handling based on changing road conditions or varied trailer loads.


Pinch-Trigger Manual Override

The Discovery comes with a easy-to-reach, pinch-trigger manual override, great for stopping sway or controlling your trailer's momentum in emergencies. To engage the manual override, just push in the trigger. This will activate the trailer's brakes and brake lights without you having to apply the brakes on your tow vehicle, perfect for limiting trailer movement while you're cruising.


LED Display

The LED display on the Discovery is large and easy to read at a glance. It will show you what setting the brake controller is on as well as give you information for troubleshooting. You can adjust the screen brightness or trigger night mode so it won't glare obnoxiously on your dash. Press the control button to cycle through the different modes.


Curt Discovery NEXT

Quick Installation

Because inertia plays no role in the functioning of this controller, you do not have to mount the unit at any particular angle. Your mounting options are limitless, so long as you can still easily access the controller and the manual override. The included bracket is designed to mount the brake controller flush to the dash so it takes up almost no space at all.


If your vehicle already has a plug-in brake controller wiring harness, just connect the unit to it. Otherwise, you will need to purchase a vehicle-specific wiring harness (sold separately) to plug into. If a harness is unavailable for your vehicle, hardwiring will be necessary.


Note: If a custom brake control wiring adapter is not available for your vehicle, one of the following will be required:

20-Amp circuit breaker (9506P - sold separately) for 2- to 4-brake applications

30-Amp circuit breaker (38630 - sold separately) for 6- to 8-brake applications


See also etrailer.com's exclusive 7- and 4-way brake control installation kit (ETBC7 - sold separately) if you don't already have a 7-way plug at the back of your vehicle.


Time-Delayed Braking

what is time-delayed braking

The Curt Discovery comes equipped with time-delayed braking. Every time you apply the brakes in your vehicle, a signal is sent - via the brake switch - to the Discovery. The controller then sends power out to your trailer brakes to activate them with an intensity set by you, at a rate determined by you. Both the amount of braking power (gain) and rate of application (load) can be adjusted to suit your preference, the road conditions, the type of trailer, and the weight of your load. To determine which levels are best for your application, test your towing setup and choose what feels right.



51126 Curt Discovery NEXT Time Delay Trailer Brake Control - 1 to 4 Axles

Replaces Curt 51120



Curt Custom Wiring Adapter for Trailer Brake Controllers - Dual Plug In
part number: C51525

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.

Features:

  • 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.



51525 Curt Quick Plug Brake Control Adaptor Harness




Customer Satisfaction Score:


Customer Reviews

Curt Discovery NEXT Trailer Brake Controller - 1 to 4 Axles - Time Delayed - C84VV

Curt Custom Wiring Adapter for Trailer Brake Controllers - Dual Plug In - C51525

Average Customer Rating:  4.8 out of 5 stars   (86 Customer Reviews)

An easy-to-read digital number display, 10 power levels, and a pinch-trigger manual override make this time-delayed brake controller easy to use. Installation is simple with no mounting restrictions. Activates brakes with a preset intensity. 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.

by: Thomas03/07/2024
Chevrolet Silverado

This is used on a 2020 Chevy Silverado 1500 pulling a 16' enclosed cargo trailer. With the appropriate adaptor cable it was very easy to install, just plug in and mount in a convenient spot. Once installed it was simple to get it matched to the weight and brake setup of the trailer. Close to 6k miles with it so far & very happy.



by: Brian 04/21/2024
2024 Chevrolet Silverado 1500

The combo of the Curt Spectrum brake controller and wiring harness made installation a snap



by: Jon05/31/2024

Having issue with intermittent power.

Etrailer Expert

Jenny N.

5/31/2024

Jon, what you will want to do is to take a multi-meter like the Item # PT29ZR and ensure you are getting power to your controller. You should be getting 12 volts on the black power wire and when you hit the manual over ride you will get 12v on the blue brake controller wire. If you are not getting full power you will have a loose connection somewhere and you will want to start at your fuse and work forward until you find it.



by: Travis 09/06/2022
2022 Chevrolet Silverado 2500

The wiring adapters worked great. It made installation quick, easy, and clean.

Travis

9/8/2023

The wiring adapter made connecting the trailer brake controller so quick and easy that I dont think I will ever use butt splices again.

Etrailer Expert

Mike L.

11/1/2023

@Travis The custom brake controller adapters like the Curt # C51525 certainly make the brake controller install much quicker and less complicated!


by: John R05/24/2024

Took about 10 minutes to install. Have not made all the adjustments yet, but is easy to understand.



by: Richard 05/30/2024

I like the way it installed



by: Jerry 04/25/2024

Tested . Work fine and advertised



by: Ethan 03/15/2024

excellent service and delivery.



by: Damon 04/09/2024

Makes hookups fast and easy.



by: Andy 02/10/2024

Product was perfect for my use.



by: Adam 02/07/2024

It does what it's supposed to.



by: Floyd 02/07/2024

Fit properly



by: Pamela01/09/2021

We got a new truck and needed to convert our trailer breaking unit to the new truck. I wrote to be sure what I needed, got an answer right away, ordered it, and it was easily installed!



by: Sidney 09/21/2023

Like its compact size and simple operat ion.



by: Dusten09/21/2023

Very helpful, knowledgeable and friendl y!



by: James 09/05/2023

The right part as needed



by: David 05/30/2020

Plug and Play installation with this cable! Thanks!



by: Timothy 09/27/2021

Perfect fit that made it easy to plug in and go



by: Howard03/26/2021

The products are excellent and the installation instructions are very easy to follow. Products are very well made



by: Ron R01/06/2021

Adapter is well worth it! No fussing with the wiring, just plug and go



by: Bobby B09/24/2020

Worked great with the Controller, and was a simple plug and play installation



by: Tom 09/22/2022

Easiest ever!!!



by: Donald09/20/2020
2020 Chevrolet Silverado 1500

Was just able to install controller, everything went really smooth, works great, thank you for the quick delivery as always.



by: Steve09/13/2021

Easy install with good instructions. Works well!



by: Michael11/03/2022

Works great looks great


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Ask the Experts about this Trailer Brake Controller
Do you have a question about this Trailer Brake Controller?


  • Recommended Trailer Hitch, Wiring and Brake Controller for 1994 Chevy C/K Series Cab and Chassis
  • The Draw-Tite Class V hitch, part # 41947 will most likely work for you. The hitch has a drop (distance from the bottom of the frame to the top of the receiver tube) that's adjustable to 6-5/8, 8-1/4 or 10-1/4 inches. One of these distances should allow your receiver tube to clear the bottom of the back bumper, but you'll want to measure the distance from the underside of the frame member to the lowest point of the rear bumper. For wiring, you'd begin with a 4 pole, provided by # 118315.
    view full answer...

  • Adapter Needed to Install Curt Discovery Electric Brake Controller in 1999 Ford F-350
  • To connect the Curt Discovery Electric Brake Controller # C84VV directly to the factory plug under the dash of your 1999 Ford F-350 you need # C51322. Without the harness the controller can be installed but it would need to be hardwired into the truck.
    view full answer...

  • Installing A Brake Controller in a 2008 GMC Yukon XL Without Plug and Play Adapter Harness
  • On your 2008 GMC Yukon XL, there is not a direct plug and play harness for a brake controller. This is because no plug is present under the dash, however the needed wires are already run so it is a simple install. You will connect the brake controller wiring with the vehicle wiring already present under the dash with butt connectors like # 05731-5. The Curt Discovery Timed Delay Brake Controller # C84VV gives you the option to either cut the connector off the brake controller or use
    view full answer...

  • Brake Controller Installation 2004 Chevy Avalanche
  • Your Avalanche should be prewired for a brake controller. Check the fuse panel in the engine compartment. Remove the outer and the inner fuse box cover, and on the inboard side of the fuse box, you'll see two threaded studs. The stud closest to the rear of the vehicle powers the brake controller, there should be a 30A fuse installed next to it. The stud closest to the front of the vehicle powers the 12V feed to the trailer connector. There should be a 40A fuse installed next to it. If the
    view full answer...

  • Troubleshooting Curt Discovery Trailer Brake Controller # C84VV Installed in 2002 Chevrolet Tahoe
  • Thank you for your recent purchases from etrailer. I would like to suggest some additional testing before you return the Curt Discovery Trailer Brake Controller # C84VV. This will help isolate the problem and confirm whether the unit is indeed defective. The code OL indicates that the controller has sensed an overload condition. Disconnect the trailer from the Tahoe. Apply your grounded tester to the pins at the 5-o-clock and 7-o-clock positions on the Tahoe 7-way, as shown on the
    view full answer...

  • Troubleshooting Brake Controller Install Where Brakes Lock Up As Soon as Brake Pedal is Touched
  • Since your controller is not showing a connection and your brakes are locking up anytime the brake pedal is touched that means that instead of having the brake output circuit connected to the trailer brakes (blue wire of controller) you have a stop/turn signal circuit connected to the circuit instead. You can test this pretty easily by turning on either blinker and you should feel the trailer brakes lock up with the blinker getting activated. Since your brake controller would have been
    view full answer...

  • Wiring Harness to Install Curt Discovery Brake Controller on 2010 Toyota Tundra
  • In order to install the Curt Discovery Trailer Brake Controller part # C84VV on a 2010 Toyota Tundra you'll need the Curt Custom Wiring Adapter for Trailer Brake Controllers part # C51362.
    view full answer...

  • Brake Controller Installation on 2011 Toyota Tundra
  • If your 2011 Tundra has the factory tow package, which includes the factory installed 7-way trailer connector on the rear bumper, it will be equipped with the tow package plug under the dash, as shown in the photo I've edited for you. Some models with the factory 4-pole (or 4-pin) trailer connector will also have the plug under the dash, you'll need to look for a white plug located above and to the left of the emergency brake pedal, above the toe kick. Occasionally, the plug will be located
    view full answer...

  • Turn Signals Work But Brake Lights Do Not Light Up
  • You came from a brake controller page when you asked the question. Is this issue related to the installation of the brake controller? Or are we just talking about brake lights on a trailer or vehicle? If it is on the trailer then usually there is a bad ground connection since the brake lights draw more constant power than the turn signals. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should be attached
    view full answer...

  • Can I Use the Curt Discovery Brake Controller in a 2021 Honda Pilot
  • Yes. You could use the Curt Discovery # C84VV 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 Wiring Adapter for a 2015 Toyota Tacoma with Factory 7-Way
  • No worries, the 5-wire harness will work just fine because the extra connection is for the illumination circuit and it's not needed. The Curt Discovery trailer brake controller # C84VV is a fit for your 2015 Toyota Tacoma and the direct fit pig tail adapter # C51362 you referenced is correct. You will simply plug the adapter # C51362 into your factory brake controller tow port and route the pigtail to the location of your choice so you can connect your brake controller.
    view full answer...

  • Will the Curt Custom Brake Controller Adapter # C51322 Work with a 1998 Lincoln Navigator
  • The Curt Custom Wiring Adapter, # C51322, was designed to work with the factory brake controller plug on your 1998 Lincoln Navigator. The pin for the red wire coming from the brake controller should mate with the pin for the light green wire on your factory plug. It will be the middle pin and on one side you should have a pin with constant 12 volt power and the pin on the other side should have no power. I have attached a photo that shows the functions of each pin on the custom wiring adapter
    view full answer...

  • Can Curt Discovery Brake Controller be Installed 2015 Hyundai Santa Fe
  • Yes, you can install the Curt Discovery brake controller part # C84VV in your 2015 Hyundai Santa Fe. You will also need the harness part # C51515 to give you 4 wires to then wire to your vehicle. You will need to start with a 4-way (if you do not have one). For that you would want the # C56332. From there you would need to convert the 4-way to a 7-way so that you can install the brake controller. For that you will want the Brake Controller Install Kit and 7-Way Adapter part # ETBC7.
    view full answer...

  • How to Access Vehicle Brake Light Signal for Trailer Brake Controller Installation
  • If your 2005 Toyota Sequoia has a factory-installed 7-way trailer connector you can install the Curt Discovery trailer brake controller # C84VV using only the mating wiring adapter part # C51362. If it does not then the installation will be hardwired. You can gain access to the vehicle brake light signal, which is what triggers the Discovery controller to generate output voltage for the trailer brakes, either by tapping into brake light wiring or by installing a fuse tap in the brake
    view full answer...

  • Curt Brake Controller, Wiring Harness 1999 F-350 Super Crew
  • The Curt brake controller # C84VV can plug directly into your 1999 F-350 Super Crew using the proper wiring harness, # C51322. This harness is sold separately. I have included a link to a video to the right that shows where the connection point on a similar truck. The brake controller and harness are different in the video but they plug into the same place on the truck.
    view full answer...

  • How Does Brake Controller Install in 2012 Ford F-150
  • When installing the Curt Discover part # C84VV with the harness for your 2012 Ford F-150, part # C51436 all you'd have to do is plug in the controller and harness and you'd be set if you have the factory 7-way like it sounds like you do. It's really a pretty simple install. Otherwise you'd need a 4-way to 7-way adapter like part # 37185 and you'd have to run the wire from the truck's frame rail to the adapter and you'd be set. See attached picture for more info on that.
    view full answer...

  • How To Install Curt Discovery C51120 In 2017 Chevrolet Equinox W/ ETBC7
  • I would be happy to help! I looked up your order and it looks like you purchased the following products: 7-way Connector # ETBC7 4-way Connector # C56210 Curt Discovery Trailer Brake Controller # C84VV Curt Wiring Adapter # C51515 Now it looks like your 2017 Chevrolet Equinox does not have the factory trailer connector. If that is the case then the # C56210 you ordered will not work as it is designed for vehicles with the factory trailer connector. You would need the # C56594
    view full answer...

  • How to Install Curt Discovery Brake Controller in 2008 Ford F-150 With Factory 7-Way
  • The Curt Discovery brake controller part # C84VV that you referenced can easily fit your 2008 Ford F-150 with the factory 7-way by using custom install harness part # C51322. This plugs into the brake controller install port under the dash of your truck and then into the back of the controller and you're set.
    view full answer...

  • Curt Brake Controller Wiring Harness for 2018 Ford F-150
  • Curt replaced the 51437 with the # C51436 which fits a 2018 Ford F-150 (among other Ford vehicles) and is compatible with the # C84VV Curt Discovery brake controller.
    view full answer...

  • Curt Brake Controller Wiring Pigtail for 2013 Jeep Wrangler Unlimited
  • The correct pigtail wiring harness for installing a Curt Discovery Trailer Brake Controller # C84VV in your 2013 Jeep Wrangler Unlimited is part # C51515.
    view full answer...

  • How Would Brake Controller Install in 2021 Chevy Tahoe
  • If that part is available it would be through GM only. But you could also bypass needing a connector and just wire what you have found directly to a brake controller like the Brake EVN part # TK63VR instead. For this controller the black wire is the 12 volt power wire, red is stoplight circuit, blue is brake output, and white is ground.
    view full answer...

  • Where is the Factory Trailer Brake Controller Port On a 2022 Chevrolet Tahoe
  • If your 2022 Chevrolet Tahoe does not have the factory tow package then the plug may not be there. If this is the case you would need to hardwire in a brake controller. If your Tahoe does have the tow package then the plug will be under the dash. The plug will often times be taped together with another harness making it not always apparent that it is the plug you are looking for. You may need to do some searching to find the correct plug. Currently at this time (2/10/2022) the only adapter
    view full answer...

  • Parts Needed To Install Curt Assure Trailer Brake Controller On a 2024 Chevy Silverado 2500
  • The Wiring Adapter # C51525 will allow you to connect the Curt Assure Trailer Brake Controller # C49UR on your 2024 Chevrolet Silverado 2500HD.
    view full answer...

  • Curt Brake Controller Wiring Plug for a 2021 Chevy Silverado 1500
  • Thanks for reaching out, Alan! In order to install a Curt brake controller to your 2021 Chevy Silverado 1500 you'll need the Adapter # C51525, yes. This will connect under the dash to that larger gray connector you found. If you don't already have the brake controller then I really like the Curt TriFlex NEXT Trailer Brake Controller # C24VV as it has a proportional operation so the trailer brakes match the time and intensity of your truck braking.
    view full answer...

Info for these parts were:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Kathleen M
Installed by:
Kathleen M
Employee Wilson B
Updated by:
Wilson B
Employee Kristina F
Updated by:
Kristina F
Employee Isabelle B
Updated by:
Isabelle B
Employee Ronnie R
Written by:
Ronnie R
Employee Jonathan Y
Video by:
Jonathan Y
Employee Matthew B
Test Fit:
Matthew B

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