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

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

Item # C51120

lowest price pledge

Retail:$80.74

Our Price: $43.95

You Save: 46%
Brake Controller

Orders above $50 qualify for Free Shipping

Shipping Weight: 0.72 lbs

Select Ground or Free Shipping for delivery before Christmas
Quantity: 
In Stock
Brake Controller C51120 - Automatic Leveling - Curt
zoom in icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.
Please enter a valid email address.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

pop out icon replay 360 icon
horizontal rotate icon

Product Images

spin image icon
Brake Controller C51120 - Automatic Leveling - Curt
Brake Controller C51120 - Up to 4 Axles - Curt
C51120 - Digital Display Curt Time Delayed Controller
Curt Discovery Trailer Brake Controller - 1 to 4 Axles - Time Delayed Electric C51120
C51120 - Electric Curt Brake Controller
Curt Time Delayed Controller - C51120
Curt Time Delayed Controller - C51120
C51120 - Digital Display Curt Time Delayed Controller
Curt Time Delayed Controller - C51120
Curt Discovery Trailer Brake Controller - 1 to 4 Axles - Time Delayed 360 Degrees C51120

In Use/Installed

C51120 - Automatic Leveling Curt Time Delayed Controller on 2008 Chevrolet Silverado
Brake Controller C51120 - Digital Display - Curt on 2008 Chevrolet Silverado
Curt Digital Display Brake Controller - C51120 on 2008 Chevrolet Silverado
Curt Automatic Leveling Brake Controller - C51120 on 2008 Chevrolet Silverado
Brake Controller C51120 - Digital Display - Curt on 2008 Chevrolet Silverado

Customer Photos


  • Time Delayed Controller
  • Curt
  • Electric
  • Up to 4 Axles
  • Under Dash Mount
  • Automatic Leveling
  • Digital Display
  • 360 Degrees
The best technical support and full brake controller installation instructions. Lowest price Express Van brake controller guarantee and expert service. Chevrolet Express Van, 2008 brake controller by Curt are available from etrailer.com. For expert service call 800-298-8924 to order your Curt Discovery Trailer Brake Controller - 1 to 4 Axles - Time Delayed part number C51120, or order online at etrailer.com.


  • All Info
  • Reviews (180)
  • Q & A (88)
  • Videos (6)
  • Photos
  • Why etrailer?

2008 Chevrolet Express Van - Curt Discovery Trailer Brake Controller - 1 to 4 Axles - Time Delayed

Electronic controller activates electric trailer brakes with a preset intensity when you apply the brakes in your Chevrolet Express Van. Power output and braking aggressiveness are easily adjustable. Includes easy-to-read digital display and manual override.


Features:

  • Brake controller activates trailer brakes with preset intensity
    • Signal is sent to trailer brakes when tow vehicle's brakes are activated
  • Adjustable, thumbwheel power output control lets you determine the amount of braking force
    • Set to maximum when you travel through hilly terrain with a fully loaded trailer
    • Back off the power output when you tow a lightweight trailer
  • Sync setting lets you adjust the aggressiveness with which the brakes are activated
    • Get full power output faster by moving slide-bar switch forward to increase activation speed
    • Achieve smoother braking by moving switch in opposite direction to supply power gradually
  • Easy-to-read digital display communicates brake force output, sync setting, and error codes
  • Self-diagnostics function monitors trailer connection and checks for shorts
  • Built-in, slide-bar manual override
  • Quick and easy installation
    • No need to mount level like proportional brake controllers
    • Mounting bracket and hardware included
    • Plug-in, vehicle-specific brake control adapter (sold separately) can be used for certain applications to reduce installation time


Specs:

  • Application: trailers with up to 4 axles (8 brake assemblies)
    • Designed for use with electric brakes only
  • Limited lifetime warranty


Time-Delayed Braking

The Discovery applies your trailer's brakes when the brake pedal in your tow vehicle is engaged. Every time you apply the brakes in your Chevrolet Express Van, 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 (output) and rate of application (sync) can be adjusted to suit your preference, the road conditions, type of trailer, and size of the load. To determine which levels are best for your application, you must test out your towing setup and choose what feels best.


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, the Discovery sends power out in the same way, with the same gradual delay, no matter the braking situation. Although this delay always exists, it can be adjusted by changing the sync setting.


Built-In Controls for Adjustable Power

Curt Discovery Controls and Components

The above diagram shows the controls and components of the Curt Discovery trailer brake controller.

  1. Digital display
  2. Power output control
  3. Sync control
  4. Slide-bar manual override

Output Control

During the initial setup process, use the thumbwheel control on top of the Discovery to adjust the output. The output control lets you set the maximum amount of power that will be applied to your trailer's brakes. Typically, the output is only readjusted when you experience changing road conditions or if you switch over from a heavy, loaded trailer to a much lighter, empty trailer, or vice versa. To get more power to your brakes, rotate the switch to the right. To decrease the power output, move it to the left. The output setting will appear on the digital display when you press the brake pedal or activate the manual override. This setting ranges from 0 to 10, with 10 indicating maximum output.


Sync Setting

To adjust the aggressiveness of your trailer's braking action, use the slide-bar control on the side of the Discovery to change the sync setting. If you want to reach maximum power output faster, move the switch forward. To get smoother braking action, slide the switch backward, thus supplying power to the trailer brakes more gradually. You can alter the sync setting to suit your driving preferences or to improve handling based on changing road conditions or varied trailer loads. The digital display will only show the sync setting as you adjust it.


Quick, Simple Installation

Because inertia plays no role in the functioning of this controller, you do not have to mount the unit at any particular angle. As a result, mounting options are limitless, so long as you can still easily access the controller.


Installation of the Discovery requires that you either purchase a custom wiring adapter designed to plug into the controller or that you hardwire the controller directly into your Chevrolet Express Van. To hardwire the Discovery, you must remove the plug at the end of the integrated wiring harness.


Installation Accessories

For easier installation, a vehicle-specific wiring adapter (sold separately) is available for most newer trucks and SUVs. One end of the custom adapter plugs into your vehicle, and the other end plugs into the controller - no hardwiring required.


Note: If a custom brake control wiring adapter is not available for your Chevrolet Express Van, 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 Chevrolet Express Van.



51120 Curt Discovery Time Delay Trailer Brake Control



C51120 Installation InstructionsInstallation Details C51120 Installation instructions

Video of Curt Discovery Trailer Brake Controller - 1 to 4 Axles - Time Delayed


Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Curt Brake Controller C51120 Review

Today we're going to take a look at the Curt Discovery Trailer Brake Controller number C51120. This time delayed brake controller activates trailer brakes with a preset intensity. The signal is sent to the trailer brakes when the tow vehicle's brakes are activated.It has an adjustable thumb wheel power output that allows you to determine the amount of breaking force you would set to the maximum when you travel through a more hilly terrain with a fully loaded trailer and you would back off the power output when you're towing a smaller more lightweight trailer.It also features a sink switch here on the side. It allows you to adjust the aggressiveness of the brakes. If you want it full power in this position right here. It will increase the activation speed of the brakes and you would move it back in the opposite direction to achieve a smoother braking by supplying the power more gradually.

It has an easy to read digital display that communicates brake force output, sink setting and air codes and we'll attach this to a power supply in just a moment so you can see that a little better. Self-diagnostics function monitors the trailer connection and checks for shorts. It has a built in slide bar emergency manual override and again we'll discuss that more in just a moment. It has also has a quick and easy installation. It comes with the mounting bracket right here.

The screws to attach the bracket to the controller as well as a quick reference card if you have any questions. One of the differences between the time delay brake controller and a proportional brake controller is there's no need to mount this one level the way you would a proportional controller.You can mount it up, down, side to side, as long as you can see the digital display you're good to go. This application is for trailers up to four axles or eight brake assemblies. It's designed for use with electric brakes only and it does have a limited lifetime warranty. Now we're going to attach it to our power supply and the wiring harness that we're using here is the Curt Universal Wiring Adapter for Curt Trailer Brake Controllers, number C51515.

This particular harness ends in a pigtail and it is intended for vehicles who do not come with a factory installed brake controller port. Now when you hit the brake you will be able to see the digital display and say right here we'll use our output knob here. You can go from zero to ten and we'll set that at five for right now and over here our sink all the way to nine and then slide it back to zero. We will put that at five as well. When we talk about our emergency manual override say youre in traffic and somebody cuts you off and you have to hit the brakes really quick what you would do is hitch your emergency manual override and instead of the normal amount of time it would take for the trailer brakes to brake this removes the time delay function and the maximum output that you had preset it goes to the brakes immediately to help slow you down to prevent any accidents.

That should just about do it for our Curt Discovery Trailer Brake Controller number C51120.


Customer Reviews

Curt Discovery Trailer Brake Controller - 1 to 4 Axles - Time Delayed - C51120

Average Customer Rating:  4.8 out of 5 stars   (180 Customer Reviews)

Electronic controller activates electric trailer brakes with a preset intensity when you apply the brakes in your vehicle. Power output and braking aggressiveness are easily adjustable. Includes easy-to-read digital display and manual override.

- C51120

by:


Excellent customer service very professional. Fast and easy shipping. Very knowledgeable staff. I will be back. 575040



- C51120

by:


The controller was easy to install. It works exactly as it should at a very good price. Costumer service is excellent. The first controller we received was broken. A quick phone call and two days later a new controller. Would definitely order from this company again. 541795



- C51120

by:


Not too thrilled with this one. Three main issues listed in increasing order of magnitude. 1. One of the segments on the display died shortly after installing. 2. The adjustment wheel is very crude and hard to dial in. 3. This one is the killer, if you start by manually applying the brakes using the slider, and then put your foot on the brake pedal, and then release the lever, the BRAKES GO FULL LOCK! That's a design flaw in the circuit. 501648



- C51120

by:


Purchased this controller for limited use. Really like the vehicle specific plug adaptor that came with it. Makes for a quick clean install. Clean compact design and easy to use. 544267



- C51120

by:


After reading the reviews of this product I decided to give it a try myself, with a great price. When I received it within a week along with the plug and play 7 prong trailer hitch adapter, I realized I was missing something. The plug and play adapter for this product. It showed me it when I was buying and for what ever reason I didn't have the option to add it as well. It was very easy to install, like I said plug and play. The problem is it does not work. followed all the directions, double checked everything I just don't have a signal to the trailer from the break controller. Good luck 278660



- C51120

by:


I bought a new car dolly with electric brakes to pull with our motorhome ( Fleetwood FlAIR 2001 ) as all states require brakes on trailers at all different weight levels. I called E trailer and spoke with Danna and after talking with her about different models I choose the C51120 time delay control, as it can be adjusted to work well with the tow vehicle . I received the control with in 3 days of the order and went to put it in and found under the dash wire a harness by Fleetwood which told where each wire on the controller went on the harness. I was able to hook it up sitting in the drivers seat. Completed the hook up and started to test the operation, to find I was not getting the proper readings. I talked with Tom and he said he would bench test a like control and report back to me, at 6 pm he left a message on our phone that he believed the problem was along the blue wire to the trailer on the tow vehicle . I started at the back of the, motorhome and moved forward testing for a brake signal, I found that the butt connector had pulled apart and was not getting current to the plug in at rear of coach. Hooked it back together and re taped the wires and it works like a charm. I want to thank all off you for the prompt and knowledgeable service, I would recommend E trailer to anyone who wants to deal with a great staff and company Thank you 237064


Comments

I used this controller to pull ma car dolly to AZ and back through all the mountains and it worked GREAT I am very happy with how it worked Great product

Bob R - 02/04/2017

22382

- C51120

by:


This Curt Discover controller works great. Super easy to install if you get the pigtail for your model truck. I especially like the fact that you can install the bracket under the dash on my new 2018 Silverado using factory screw under the dash. No drilling required. As always wonderful pricing and delivery from E-Trailer. 533806



- C51120

by:


the brake controller with all the wiring plus the 7 pin plug was better than i thought . it even has great instructions and easy to read. the price was good . the 7 pin plug even has the 4 pin connector mounted in with it very glad that i bought it is everything that you need to make it work . everything about it is excellent very glad that i found it here at a good price . even fast shipping . again thanks for good product 230172


Comments

Use it for pulling camper works great even a good price fast shipping . Its been a year and still working great.

George D - 10/16/2016

21545


- C51120

by:


Awesome product. Easy to install and adjust to your liking. Use in combination with the custom wiring adapter for your vehicle and you have a product that can't go wrong! 198827


Comments

This product has worked flawlessly this past year. Great product and will definitely deal with etrailer for all my trailer needs

Raymond L - 05/29/2016

18132

- C51120

by:


Ordered a brake control and an inline circuit breaker on Feb 11th and shipped the same day. I chose the least expensive shipping option (my bad). A combination of UPS/US Post Office, or so I was told after calling to find out where my shipment was. Tracking info said delivery by the 15th. When it didn't show I called etrailer and was told the post office had it and it was out for delivery...2 days later I finally received it (Feb 20th). I ordered a hitch a couple of weeks prior and received it in 2 days. A 49lb hitch vs a 1lb (maybe) package. Not etrailers fault but I can see why the post office is going broke with service like that! 117375



- C51120

by:


This is an outstanding product - exactly as described. I installed it into my 2005 Ford F150 XLT Extended Cab. Took longer for me to decide where to put it than the actual installation, which took about 3 minutes. My truck had the tow package so the harness - which was included - was an exact match to my truck's harness plug on the right side of the dash in the driver's area. Extremely satisfied. 111895


Comments

It is still working well I used the Brake Controller a week ago and still no problems. Works exactly as described. Great product!

Randy G - 01/05/2015

8405

- C51120

by:


Product works great just as described . Did have a little trouble installing it but otherwise no issues. 544469



- C51120

by:


Easy to install and Thanks for the help. 247727


Comments

Perfect.

Bobby - 04/30/2017

23537

- C51120

by:


Worked very well 550732



- C51120

by:


Product is what fits my truck for proper operation. Compact and easy to use. Price is right and is easy to install. 541792



- C51120

by:


Works very well! Nice product and easy install! Very satisfied! 523370



- C51120

by:


Exactly what I wanted 524866



- C51120

by:


Installed in about 5 min. Arrived ahead of schedule and instruction videos were great. Will buy All trailer stuff here in future. 517464



- C51120

by:


Bought this for my father for father’s day gift. Worked great. He was glad to get it. 517633



- C51120

by:


Good quality product ( electric trailer brake control) and fast delivery!! Very satisfied. Do recommend!! 517385



- C51120

by:


The break controller and dual plug in adaptor worked great for my 2014 QX60. Easy to install and worked perfect. 513770



- C51120

by:


Easy to install and does what I need it to. 514072



- C51120

by:


When i needed to replace my electric brake controller on my truck for pulling my trailers I first ordered from another dealer and when i got the unit and read the instructions there were about 3 items that i wasn't told about and sent it back ,so i kept searching for the controllers and came across e trailers , there were so many questions i had from my researching that when i called e trailers and talked with Preston he was so helpful in explaining the differances with controllers and i explained what i wanted and why he helped set me up with the right one .I then ordered the unit it was received faster than i expectided , it took me about 20 minutes to install the wiring harness and controller, I'm very happy with the customer service rep. Preston with help and time to explain and the choice i made thanks Preston and E trailers 584058



- C51120

by:


Good product selection and high quality. Good service and follow up. Quick and secure shipping. 578797



- C51120

by:


Easy installation. .watched there video made it easy to locate my trucks wires 476511



- C51120

by:


Great glad to have bought it from e tra iler 475746



- C51120

by:


very Satisfied Customer. excellent Customer Service 475714



- C51120

by:


Less than 1 yr after installing on a 2017 F250, controller quit working right. It would surge brake to some high number like 7 (10 being max) regardless of the controller setting which would lock up trailer brakes. Next time it would only allow a setting of 2.5 or 7.5... nothing else. Next time it would do something different. Called Curt who recommended unplugging it for awhile. Worked for awhile then started acting up again. They're going to send me a replacement. Tbd if replacement will be better. 468124



- C51120

by:


Arrived very quickly & in excellent con dition. 465209



- C51120

by:


It worked great I like the fact that it digital number showed you what you're on on the trailer 463436



- C51120

by:


Product was awesome and shipping was fa st! 462544



- C51120

by:


This is a awesome product and a great price you won't be disappointed 460048



- C51120

by:


Easy install, and works great. 450377


Comments

Still working like it did day 1

Russell - 11/09/2018

45576

- C51120

by:


Works great all you need for a small tr ailer 446208



- C51120

by:


Item as described, price cheaper than everywhere else, delivered on time. Did not install it yet. 442676



- C51120

by:


Quick delivery, helpful customer service, good price, Thanks! 441770



- C51120

by:


Had one on my old truck and really liked it so when time came to install one on my new truck I went with what worked for me. Great customer service and fast shipping I would shop again. 438850



- C51120

by:


Plugged into the vehicle and hooked up the brake controller, which indicated it was correctly installed. Haven't had the opportunity to test with a trailer, but should work fine. Great follow-up emails advising order received, shipped and delivered. 436835



- C51120

by:


Appears to work. Simple to use. Small and easy to mount. 432797



- C51120

by:


Makes installation of wires easy, also allows for quick removal of controller should the need arise. 432796



- C51120

by:


Quality in a small convenient package. It fits neatly under the dash and works with outstanding results. Totally satisfied. 431510



- C51120

by:


Haven't installed it yet but looks exactly like the one they showed me online fast shipping 427182



- C51120

by:


I have had MANY braked controllers and this one is the best. Always remember when going from 2 axles to 3, you must match the proper controller. Curt is the best. 5 stars for Curt and etrailer. RB 426327



- C51120

by:


Exactly what I needed for my electric trailer brakes. Works great. Easy set up! 426226



- C51120

by:


Product works great no issues at all 420950



- C51120

by:


Had to remove the plug in adapter because former owner spliced one in ! so I did the same but with the wire diagrams It went well , ! "45 mins." Not Bad !!! 417908



- C51120

by:


Very happy with controler and bracket. Easy to install took me only minutes. 418154



- C51120

by:


Work great, Super easy installation, easy adjustments 412937



- C51120

by:


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. 410152


63
193
Show More Reviews

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


  • 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...

  • Brake Controller Install in 2014 GMC Sierra
  • The install procedure will depend on if you have a 1500 or a 2500/3500 Series. If your Sierra is a 1500 model, you will need a brake controller wiring adapter harness, part # C51451. The 2500 and 3500 series would have the tow package wiring that sits above where the driver's left knee sits. If you click the video link I've provided, you can see a controller being installed in a 2014 GMC Sierra 1500. The FAQ link I provided shows how to install a controller in the 2500/3500 model. The...
    view full answer...

  • Troubleshooting Brake Controller that Flashes When Connected to Trailer
  • It sounds like the problem is corrosion on the trailer 7-way brake output circuit which is causing the controller to only show an intermittent connection. Try cleaning off this pin on the 7-way with some fine grit sandpaper. Testing the brake controller is fairly easy. Sever the blue brake output wire near the brake controller leaving enough room to reconnect it and then apply the manual slide. Using a circuit tester like part # PTW2993, you should get output to the controller side of...
    view full answer...

  • Troubleshooting Curt # C51120 Discovery Brake Controller Showing Flashing Decimal Point on Display
  • What you're describing sounds like it could either be an interruption in the trailer brake voltage output circuit, somewhere between the controller and the trailer brakes, or you could have a defective controller. Use a circuit tester with an incandescent bulb, like part # 40376 and use the probe to pierce the insulation of the blue output wire exiting the rear of the controller and ground the alligator clip. Apply the brake pedal. If the load provided by the tester causes the display...
    view full answer...

  • Curt Discovery Brake Controller Shows OL Error When Trailer is Connected
  • It is possible that it is a simple wiring issue that is causing the errors on your Curt Discovery brake controller # C51120. On your 2010 Chevy Silverado, there is a tow package wire bundle under the dash to wire in a brake controller. The tow package red goes to brake controller black. White goes to white, blue to blue, and the light blue or orange wire on the truck goes to the brake controller red wire. The OL indicates an overload and if all of the connections at the brake controller...
    view full answer...

  • Curt Brake Controller and Wiring Harness for a 2015 Ford F-150
  • For a Curt Discovery brake controller # C51120 you will need wiring harness # C51436 for your 2015 Ford F-150. I have linked video reviews for both parts for you.
    view full answer...

  • Troubleshooting Flashing 0.0 Error Message on Curt Discovery Brake Controller # C51120
  • The troubleshooting guide included in the instructions for the Curt Discovery Brake Controller # C51120 that you referenced does not include this particular display issue, a flashing 0.0, among the possible display messages. My technical contact at Curt has never seen this particular message displayed on a Discovery brake controller. He suggested that either the display is malfunctioning or the controller is bad. Since your brakes are not engaging when you press the pedal with the trailer...
    view full answer...

  • Brake Controller Installation Harness Recommendation for a 2015 Chevy Suburban
  • Yes, there is a port under the dash of your 2015 Chevy Suburban that will allow for a painless installation of a brake controller that won't require splicing. The harness to go along with the Curt Brake Controller part # C51120 that you referenced is the part # C51452. If you went with our most popular brake controller, the P2 part # 90885 you would only need the harness part # 3016. See the install video I attached.
    view full answer...

  • Installing Curt Discovery Brake Controller # C51120 on 1988 Ford F150
  • To hardwire the # C51120 Curt Brake Controller, you can either cut off the existing plug on its wiring harness or use the universal pigtail, part # C51515. The universal pigtail would provide an easy way to quickly disconnect the brake controller, should it become necessary. You would then use our Brake Controller Installation Kit, part # ETBC7. If you do not already have a functional 4-pole trailer connector you would also need to install one using part # 118316. The install kit includes...
    view full answer...

  • Curt Discovery Brake Controller Is Only Showing A Dot When Engaging Manual Override
  • The Curt Discovery Trailer Brake Controller, # C51120, should show only the decimal point dot when the controller is activated and a trailer is not connected. If it shows the dot all the time, the red wire is connected to the wrong side of the stop light switch or the wrong switch completely like the cruise control. If you have only the decimal point when the trailer is connected, the usual cause is that the brake controller does not sense the trailer brakes. This could be due to corrosion...
    view full answer...

  • Curt Discovery Brake Control Flashing 0.0 Troubleshooting
  • The troubleshooting guide included in the instructions for the Curt Discovery Brake Controller # C51120 that you referenced does not include this particular display issue, a flashing 0.0, among the possible display messages. My technical contact at Curt has never seen this particular message displayed on a Discovery brake controller. He suggested that either the display is malfunctioning or the controller is bad. Since your brakes are not engaging when you press the pedal with the trailer...
    view full answer...

  • Troubleshooting Curt Discovery Trailer Brake Controller # C51120 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 # C51120. 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...

  • Curt Discovery Trailer Brake Controller # C51120 Displays Only a Red Dot After Installation
  • If your Curt Discovery Trailer Brake Controller # C51120 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...

  • How to Find and Access the Brake Light Switch Wire on a 2015 Toyota Highlander for Brake Controller
  • If you check out the video I attached you will see how we installed a brake controller in a very similar 2014 Toyota Highlander as your 2015 model. We had to remove the lower dash panel (13:00 mark of the video), to make accessing the green wire possible. The kit used for the install in the video is the part # ETBC7.
    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 # C51120 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...

  • Issues with Brakes Not Activating with Curt Discovery Brake Controller on 2015 Ram 1500
  • I spoke with my contact at Curt about the issues you and other customers have experienced with their Curt Discovery Brake Controllers # C51120 and newer model Ram trucks. The problem stems from a low voltage output on the stoplight wire on the truck. The Discovery requires 12 volts from the stop light wire in order to recognize the signal and activate the trailer brakes. Curt has found that the newer Ram trucks often have less than 12 volts at the stop light wire when the brake pedal...
    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 # C51120 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...

  • Wiring Curt Brake Controller # C51120 in 2002 GMC Sierra 1500
  • Based on your description of the problem with your Curt Discovery # C51120 Time Delayed Brake Controller one cause could be a mis-wired plug-and-play harness. Please refer to the photo provided which shows how the vehicle side of the harness should be wired. For reference I have also linked a help article concerning brake controller installations in GMC trucks. The connector should be pinned out with the four wires as shown in the provided photo. If the red wire is connected to a different...
    view full answer...

  • Troubleshooting 7-Way and Brake Controller Wiring on a 1997 Dodge Ram 2500
  • To have a brake controller function properly you will need to have a 7-way on your vehicle instead of the 4-way. Don't worry, I can help you get your Ram equipped for your RV. Thanks for sending your images, they really helped explain the situation. The simplest way to install the brake controller is to hardwire the vehicle. The part you will want to do this is the # ETBC7, this will adapt your 4-way harness that you currently have and provide you with the added wiring to make the...
    view full answer...


Do you have a question about this Brake Controller?




  • Why etrailer.com?

    At etrailer.com we guarantee:

  • Highest quality brake controller for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate brake controller information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Satisfaction Guarantee
    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Edited by:
Leah B
Expert Research:
Jackie C
Expert Research:
Michael L
Written by:
Lindsey S
Expert Research:
Michael H
Expert Research:
Jameson C
Video Edited:
Joshua S
Test Fit:
Nicholas E
Expert Research:
John H
Updated by:
Adele M
Video Edited:
Andrew L
Expert Research:
Adam R
Video Edited:
Dustin K
Photos by:
Jim W
Test Fit:
Shane T
Expert Research:
Jeffrey L
Test Fit:
Randy B

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.




^
About Us
photos and videos
1,056,204

Original Photos & Videos

Produced to make sure you know what you are getting and you get exactly what you need.

installations
35,570

Installations Completed

To make sure products work and fit the way they are supposed to.

etrailer call center
2,476,511

Phone Calls & Emails Answered

1,125,924 phone calls and 1,350,587 emails to help find the right solution.

etrailer training
400+

Average Hours of Product Training

We get to know our products firsthand so experts can better help you.

etrailer service
71

Years of Quality Customer Service

Assisting our neighbors and customers, face to face at the counter.

etrailer experts
193,357

Pages of Expert Information

Created to make sure you have all the answers to your questions, from real experts.