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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,C51522

Retail:$190.69
Our Price: $127.85
You Save: $62.84
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: C51522

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.



51522 Curt Quick Plug Brake Control Adaptor Harness

California residents: click here




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 - C51522

Average Customer Rating:  4.6 out of 5 stars   (29 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: William03/30/2020

This made for an easy plug and play installation—and even included instructions for removal is the lower dash trim panel in my Audi.



by: Barry12/02/2022
Audi

This brake controller works perfectly for my 2014 Audi Q7! The instructions were easy to follow thereby making the installation a straightforward process. The hardest part was deciding where to install the dial. The dial has a solid and deliberate feel when turning and numerous options for fine tuning.



by: John R05/24/2024

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



by: Jerry 04/25/2024

Tested . Work fine and advertised



by: Todd03/13/2024
2019 Volkswagen Atlas

The product was exactly what was required for the job. Was disappointed in shipping since I paid extra for expedited shipping and it arrived a day later than expected. I could have got it in the same time frame and saved $XX.00.



by: Ethan 03/15/2024

excellent service and delivery.



by: Sidney 09/21/2023

Like its compact size and simple operat ion.



by: Dusten09/21/2023

Very helpful, knowledgeable and friendl y!



by: Martin 05/11/2021
Audi

perfect fit for Audi Q7



by: Scott 05/13/2020

Product is as advertised, functions perfectly, and arrived on time.



by: Eric 10/29/2020

Bien reste à essayer merci



by: Gary 02/10/2024



by: Christopher 03/22/2024



by: Thomas 02/14/2024



by: Steve04/19/2024



by: Roy03/03/2024



by: Vernon 05/04/2024



by: William 03/13/2024



by: Casey 05/08/2024



by: Joseph 03/23/2024



by: Efrain 02/07/2024



by: Jose 04/05/2024



by: Steven 05/20/2024



by: Paul 03/25/2024



by: Andy03/22/2024


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Show More Reviews

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


  • 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...

  • 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...

  • Troubleshooting No Power on Blue Wire After Installing Curt Discovery Brake Controller
  • The issue you're describing likely has to do with the red brake input wire coming from the Curt Discovery Brake Controller # C84VV and corresponding harness # C51515. You will want to make sure that this red wire is connected to the cold side of the brake light switch behind the Suburban's brake pedal. This is the wire that ONLY gets power when the brake pedal is depressed and no power with any other function. I recommend using a circuit tester like # PTW2993 to verify you have found
    view full answer...

  • Troubleshooting Trailer Brake Controller that Only Functions When Engine Isnt Running
  • That is an interesting problem you are having, but the problem lies somewhere in the wiring of the brake controller/7-way. The only way a brake controller is going to work properly with the key in the ACC position but not when the vehicle is running has to be due to wiring. Check to make sure there are no shorts between the two wires you ran to the rear of the 7-way. It sounds like you ran a wire for the 12 volt accessory circuit and an additional wire for the brake output. You might
    view full answer...

  • Help! Curt Discovery Trailer Brake Controller # C84VV Only Shows Decimal When Brake is Applied
  • Since the Curt Discovery Trailer Brake Controller, # C84VV, is still displaying the decimal when the trailer is connected, the controller is not sensing a connection with the trailer brakes. In this case the issue is most likely related to a wiring problem or brake magnet problem. I would start by making sure that there isn't any corrosion in either connector. Next, I recommend using a circuit tester like part # PTW2993, to make sure that you have power on the brake controller output pin
    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...

  • Parts Needed to Install the Curt Discovery Brake Controller # C51120 on a 2013 Dodge Durango
  • The Curt Discovery Trailer Brake Controller, # C84VV, and the Custom Wiring Adapter, # C51446, will work on your 2013 Dodge Durango without splicing as long as your Durango came with a factory 7-way trailer connector at the trailer hitch. The 7-way trailer connector would indicate that your truck has the factory tow package, which would include a brake controller plug under the drivers side dash. You should see a gray connector just to the left of the steering column. If your Durango
    view full answer...

  • Curt Discovery Brake Controller Display Flashes with Left Turn Signal
  • It could be a wiring issue. Specifically, it is likely related to the brake controller red wire. If that wire is not attached to the correct circuit, it can cause some strange things to happen. The red wire needs to be connected to a brake switch wire that only has power when the brake pedal is pressed. If that same wire has power, then the headlights or a turn signal are on then it is not the correct wire. I have heard that the correct brake switch wire is the white wire so use a circuit
    view full answer...

  • Curt Discovery Brake Controller # C84VV Generates Output Signal at All Times
  • Thank you for your recent purchase from etrailer of a Curt Discovery Brake Controller # C84VV and harness # C51515. The blue output wire on your Discovery brake controller should carry an output signal under two conditions: when the brake pedal is pressed or when the manual override slide bar is engaged. Since your unit generates output continuously without either of these conditions met this means that either the unit is malfunctioning or that the red input signal wire to the controller
    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...

  • Brake Stoplamp Switch Wire Color For Brake Controller Install on 2016 Ford F150
  • You'll be looking for a purple and white wire, but if you're wanting to install a brake controller there is a plug and play option that would require no cutting or splicing. If you look at the installation video I've linked for you, you can see that the brake controller connector is located behind the dash, all you'll need is the correct wiring harness to connect the controller and the vehicle and you'll be good to go. If you're using a Curt brake controller like the # C84VV, you would
    view full answer...

  • Which is Better a Time Delayed or Proportional Brake Controller
  • Between the two controller I would go with the proportional Curt Triflex part # C51140 over the time delayed Curt Discovery part # C84VV. A time delay controller is so named because there is a delay between the time that you initially apply the brakes in your tow vehicle and the time that the controller reaches maximum power output. Unlike a proportional brake controller, which activates your trailer's brakes based on the deceleration of your tow vehicle, a time-delayed controller sends
    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...

  • Compatibility of Curt Discovery Brake Controller With 2010 Chevy Silverado
  • Brake controllers are not vehicle specific. The # C84VV 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...

  • Troubleshooting Trailer Brakes that Lock Up When Trailer Is Connected
  • There is a short or a mis-wire on the 7-way you installed. It sounds like the 12 volt accessory circuit is shorting out to the brake output circuit which is causing the brakes of the trailer to lock up anytime the 7-way is connected. This is a fairly common issue as wiring up connectors is a bit confusing. Since the controller never senses a connection it sounds like the problem is the circuits just being wired backwards. I attached a chart that has what the 7-way pin out should look like.
    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 Discovery Trailer Brake Controller # C84VV Displays Only a Red Dot After Installation
  • If your Curt Discovery Trailer Brake Controller # C84VV displays only a red dot when you do NOT have a trailer connected then this indicates that the controller's red (input signal) wire is connected to the wrong side of the brake light switch. This red wire should connect to the COLD side of the switch that has power only when you press the brake pedal. If your Discovery displays the red dot when you DO have a trailer connected then this usually indicates a problem in the trailer brake
    view full answer...

  • Brake Output on Connector with No Trailer Connected Using Curt Discovery Trailer Brake Controller
  • In regards to the Curt Discovery Trailer Brake Controller part # C84VV, there should not be power on the brake output pin inside the trailer connector without a trailer hooked up. There could be a few different things causing this but in order to rule out the brake controller you'll want to do a bench test outlined below. If the controller test good then that means you have a short on the brake output wire on the vehicle and you'd need to start tracing and checking for shorts. It may also
    view full answer...

  • Gauge Wire Recommendation for Installing Curt Discovery Brake Controller
  • Curt does recommend that you use 10 gauge wire like part # 10-1-1 sold by the foot to install the Curt Discovery # C84VV, but the common recommendation for installing brake controllers is to use 12 gauge or larger wire. If you use 12 gauge wire you should be just fine, especially since you will only be activating 4 brake assemblies.
    view full answer...

  • 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 # C84VV you will also need pigtail # C51515. Then you can make the following connections: Vehicle red/black wire to controller black wire for 12
    view full answer...

  • Brake Controller For 2009 Volkswagen Touareg With Factory Tow Package
  • You will need a brake controller for your Forest River travel trailer with electric brakes and for your 2009 Volkswagen Touareg with the factory tow package, there is a plug-in option available from Curt: - Curt Assure Trailer Brake Controller with Dynamic Screen # C49UR - Curt Custom Wiring Adapter for Trailer Brake Controllers # C51522 The Assure # C49UR will give your travel trailer smooth braking proportional to that of your truck so you have a more comfortable, safe towing
    view full answer...

  • Easy to Install Brake Controller for 2014 Audi Q7
  • I have a really easy to install brake controller for your 2014 Audi Q7 that works great and is super convenient but the only way to install a Redarc Tow Pro part # RED44FR is going to be by hardwiring the install. Instead check out the Echo Mobile part # C51180. Basically this just plugs into an active 7-way and once you sync it to your phone it's ready to go. This brake controller is proportional which means it senses the amount of deceleration your tow vehicle is applying and applies
    view full answer...

  • Plug-In Brake Controller Adapter for a 2018 Audi Q5
  • I do have a really great alternative brake controller solution for your 2018 Audi Q5 but none of the top brake controller manufactures offers a plug-in brake controller adapter harness like the Curt Custom Wiring Adapter for Trailer Brake Controllers part # C51522 for this vehicle yet. Therefore, you have two options which are to hardwire your own harness in or use a wireless brake controller. If you wish to hardwire your own harness in then you will need to cut the factory plug off the
    view full answer...

  • Install Harness for Redarc Tow Pro Elite Brake Controller 2012 Volkswagen Touareg
  • The recommended install harness for the Redarc Tow Pro Elite part # RED44FR to install in your 2012 Volkswagen Touareg is the Curt # C51522 which would match color for color when you wire it to the Redarc controller. So yes, you'd just need to match the colors and you'd be good.
    view full answer...

  • Plug-In Harness to Install Tekonsha Brake Controller on 2017 Audi Q5
  • You are correct that Tekonsha does not currently have a plug-in wiring harness available for your 2017 Audi Q5 but you're also right that you can simply cut off the brake controller end of the Curt # C51522 and hardwire it to the pigtail on your Tekonsha Prodigy P2 # 90885 for installation. You will then still be able to use the vehicle-side plug to connect to the factory port behind the dash of your Audi Q5. After cutting off the controller-side plug on the harness the wires will splice
    view full answer...

Info for these parts were:

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

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