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  1. Trailer Brake Controller
  2. CURT
  3. Electric
  4. Electric over Hydraulic
  5. Proportional Controller
  6. Up to 4 Axles
Curt Spectrum Brake Controller w/ Custom Harness - Dash Mounted Knob - Up to 4 Axles - Proportional
CURT

Curt Spectrum Brake Controller w/ Custom Harness - Dash Mounted Knob - Up to 4 Axles - Proportional

Part Number: C36QV
In Stock
$259.95
Trailer Brake Controller

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You can stick the control knob to the dashboard, plug in the module, and your brake controller installation is done with no drilling and no hardwiring. The knob is large and easy to use, while the main unit is out of sight behind the dash. Great Prices for the best trailer brake controller from CURT. Curt Spectrum Brake Controller w/ Custom Harness - Dash Mounted Knob - Up to 4 Axles - Proportional part number C36QV can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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CURT Trailer Brake Controller - C36QV

  • Electric
  • Electric over Hydraulic
  • Proportional Controller
  • Up to 4 Axles
  • CURT
  • Behind-Dash
  • Plug-In
  • Dash-Mounted Knob
  • Multiple Trailers
  • Indicator Lights

You can stick the control knob to the dashboard, plug in the module, and your brake controller installation is done with no drilling and no hardwiring. The knob is large and easy to use, while the main unit is out of sight behind the dash.


Features:

  • Proportional braking - Smooth, safe, and good for your brakes long-term
  • Fingertip control
    • Adjust braking output and sensitivity by turning the dial
    • Push the button to activate manual override
    • Troubleshoot with colored LED indicators
  • No-drill installation - Knob adheres to dash, main unit installs behind it
  • Plug-and-play - Custom-fit wiring harness
  • Assembled in the USA


Specs:

  • Application: trailers with 1 to 4 axles (8 brake assemblies)
    • Compatible with electric or electric-over-hydraulic trailer brakes
    • Compatible with ABS brakes, cruise control, low-voltage wiring, multiplex wiring, and PWM systems
  • Main unit dimensions: 3" long x 3-1/2" wide x 7/8" tall
  • Control knob dimensions:
    • Extension: 1-1/2"
    • Diameter: 1-3/4"
  • Cable length: 4'
  • Warranty:
    • Limited lifetime on brake controller
    • Limited 1-year on wiring harness


How Does the Curt Spectrum Work?

The Spectrum puts control of your trailer's brakes at your fingertips and, with bright LED indicators, you know what your brake controller is doing at a glance.


Curt Spectrum Dash-Mounted Knob

You can adjust all of your settings using the control knob. To switch between modes, press the control button in the center of the knob. Each mode has its own distinct LED display with several different colors and patterns to eliminate any guesswork as you cycle through.


Curt Spectrum LED diagnostics

Output: Braking output is the maximum amount of power that will be applied to your trailer's brakes. 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.


Sensitivity: This controls the aggressiveness of your trailer's braking, meaning how quickly the brakes reach the set output level. This is a great adjustment to make when you're towing a heavy load and the trailer will need more umph to bring it to a stop so it doesn't push your vehicle forward. If your vehicle takes too long to come to a stop, increase the setting. If it stops too abruptly, lower the setting. You may also need to adjust the sensitivity based on your own preferences, or when the trailer load or road conditions change.


Manual Override: The manual override activates just the brakes of your trailer, great for stopping sway or controlling its momentum in an emergency. To engage the manual override, press and hold the button on the control knob.


Curt Spectrum review

No-Drill Installation

The Curt Spectrum comes in 2 pieces: the main unit and the control knob. Because the only part that you need to be able to access is the control knob, the main unit can be mounted out of sight and out of the way. You don't have to worry about banging your knee on a bulky brake controller or interfering with your vehicle's lower airbags.


Curt Spectrum Dash Knob

The dash-mounted control knob can be installed in any convenient spot that's easy for you to see and reach. This can be a blank switch panel, an open spot on your center console, or wherever there's space on your dashboard. The knob sits flush against the dash, so you don't have to worry about finding enough clearance behind the dash. You can use either the included screw to mount the knob, or the adhesive pad for a drill-free installation.


Once you've decided where you want to put the control knob, you'll need to find a good place to install the main unit. Your only restriction is the 4' plug-in cable that has to be able to reach between the main unit and the control knob. Thanks to the 3-axis accelerometer, the main unit can be positioned at any angle or position. No matter how you install it, the unit will sense the direction of travel and its orientation.


The included custom-fit adapter plugs into the port on your vehicle's built-in brake control wiring harness, which you'll find underneath the dash, to the left of the steering column, taped to another harness near the emergency brake pedal. Once you're plugged into the factory port, just plug the other end of the adapter into the main unit. No hardwiring needed!


Note: If you don't already have a 7-way plug at the back of your vehicle, take a look at our exclusive 7- and 4-way brake controller installation kit (ETBC7 - sold separately).


What is Proportional Braking?

What is proportional Braking

Proportional braking means that your trailer brakes mimic your tow vehicle's brakes. If you slam on the brakes in your vehicle, your trailer brakes will activate with the same intensity; if you brake lightly, your trailer brakes lightly too. The trailer's braking is in proportion to your vehicle's braking. This saves wear and tear on the tires and the brakes on both your vehicle and trailer.


The Spectrum uses an internal 3-axis accelerometer to sense how your vehicle is braking so it can send the right amount of braking power to your trailer. It measures the inertia of your tow vehicle and activates the trailer's brakes to ensure that your trailer slows at the same rate. The result is uniform braking across your towing setup. No push-pull action - just smooth, proportional braking every time.



51170 Curt Spectrum Trailer Brake Controller - Dash Mounted Knob - Proportional - 1 to 4 Axles

51525 Curt Quick Plug Brake Control Adaptor Harness

Installation Details C36QV Installation instructionsAlternate Instructions C36QV Installation instructions


California residents: click here


Customer Satisfaction Score:

Ratings & Reviews

4.6

410 reviews
You can stick the control knob to the dashboard, plug in the module, and your brake controller installation is done with no drilling and no hardwiring. The knob is large and easy to use, while the main unit is out of sight behind the dash.

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A wonderful customer experience. Worked with professionals who guided me in selecting the correct product. Thank You!



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Brittany was professional and patient not to mention helpful.



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Excellent service



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Small form factor works great



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Extremely easy to install. Works great!



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They were very helpful on the phone to make sure i purchased the correct setup for my truck. I received it that week and installed it over the weekend. So far it is out performing the previous brake that was installed.



by:

Install was a breeze because of the vehicle specific pigtail, etrailer's customer service is excellent and the information on installation helped me locate my plug



by:

Looks like oem equipment not the big box that hangs down.



by:

Great so far and great tech support


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See what our Experts say about this CURT Trailer Brake Controller

  • Troubleshooting Installation of Curt Spectrum Brake Controller on 2011 Toyota Sienna
    The calibration process of the Curt Spectrum # C51170 should only happen after initial installation and should be run before you plug in the trailer to your tow vehicle. You should have seen the green lights on the knob light up in a clockwise motion 7 times, which indicates the calibration is occurring. If you've gone through this process and the error occurred, then the lights on the knob can tell you a bit about what's potentially going on. If you're seeing all red lights that would...
    view full answer...
  • How Does Brake Controller Unplug from Vehicle to Prevent Battery Draw
    Hey Joe, while I don't know what brake controller you have you should be able to unplug it from the back of the brake controller and that would accomplish what you are wanting. What brake controller do you have?
    view full answer...
  • Troubleshooting Curt Spectrum Brake Controller - No Lights On Control Knob
    The Curt Spectrum Brake Controller # C51170 should illuminate, even if the trailer is not connected. If you are getting no lights at all, this likely means the control unit is mis wired, or there is contamination in the trailer plug socket. We recommend double checking your wiring and making sure everything is done correctly. Also clean and dry your trailer plug. I have included Curts troubleshooting guide below.
    view full answer...
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  • What Lights On Curt Spectrum Are Supposed to Activate When Pressing Brake Pedal and No Trailer?
    I have added a link near the bottom of this page with the instructions for the Curt Spectrum Trailer Brake Controller # C51170. When not connected to a trailer and pressing on the brakes you should see 2 blue lights flash on each side of the control knob. If you can tell me what you are seeing I can help you to determine what fault you may be having.
    view full answer...
  • Troubleshooting No Power To A Curt Spectrum Brake Controller In A 2022 Chevy Silverado 1500
    Hi Adam, Since you used the Curt Custom Wiring Adapter for Trailer Brake Controllers # C51525 to install the Curt Spectrum Trailer Brake Controller # C51170 you likely have either a blown trailer brake fuse or they just never installed one to begin with. The trailer brake fuse should be number 84 in the engine compartment fuse block. I recommend checking it and seeing if you're getting power or if you just need to add in a fuse to get power to the brake controller.
    view full answer...
  • Troubleshooting Curt Spectrum Output and Sensitivity Adjustment
    It sounds like the sensitivity needs to be adjusted on your Curt Spectrum # C51170 since it is too aggressive leading to the jumpy stop. To adjust the output and sensitivity you want to follow the instructions. This means you only make adjustments while stopped, with the transmission in park or neutral, parking brake applied, foot off the brake pedal, and no manual control actuation. Adjust the sensitivity by pressing the rotary knob until the brake control is in the sensitivity control...
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  • Curt Brake Controller Plug for a 2020 Ford Explorer
    Yes, the Curt Custom Wiring Adapter for Trailer Brake Controllers part # C51322 will allow you to use a Curt brake controller like the Curt Spectrum Trailer Brake Controller part # C51170 on a 2020 Ford Explorer (All Models). I checked with Curt just to confirm that the Curt Custom Wiring Adapter for Trailer Brake Controllers is indeed correct for a 2020 Ford Explorer so you can be confident this is the correct harness. The plug will be located under the driver dash, near the center console...
    view full answer...
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  • What Should Display of Curt Spectrum Show When Not Connected to Trailer
    Hey Paul, with the Curt Spectrum part # C51170 you should have blue lights on the sides of the display flashing when a trailer isn't connected and then the same lights go solid when the brakes are applied.
    view full answer...
  • Curt Echo Operation With Panic/Emergency Stop Situation
    The Curt Echo Wireless Brake Controller # C51180 works well in a panic stop/emergency situation. The mobile app has an orange button that you press and hold for that feature. I've attached a video to assist. It works as well as any other controller as long as you have that Bluetooth connection. If you want a brake controller that has the physical button, then I recommend the Redarc Tow-Pro Elite Trailer Brake Controller # RED44FR which is a customer favorite because it can be fit...
    view full answer...
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  • Recommended Brake Controller for a 2018 Thor Ace Motorhome
    For your 2018 Thor Ace Motorhome, I recommend using the Curt Spectrum Trailer Brake Controller part # C51170. The reason for this is because this unit is composed of two main parts, the control box and the output knob. The control box gets mounted out of site and then the output knob will get installed up on your dash for easy use and a very aesthetically pleasing look. The color output of the knob also helps with ease of use. Since your motorhome is on a Ford F-53 chassis, you can use...
    view full answer...
  • Troubleshooting Brake Lights Always on After Installing a Brake Controller
    Hey Honori, welcome back. The red wire being the wrong one would cause that issue if it was wired incorrectly but it would also leave your trailer brakes activated. I don't think it's that. It sounds to me like you have a short or fault somewhere in your tow wiring. Did you have any issues with your trailer lights before you installed the brake controller? If you don't know do you have another vehicle you can connect your trailer to? Isolating the problem to the trailer or vehicle is...
    view full answer...
  • Troubleshooting Random Lights on Curt Spectrum Brake Controller
    Hey Riley! Based on what you're describing with the random lights and flashing green it sounds like your Curt Spectrum # C51170 has an internal issue. Green flashing isn't even part of the troubleshooting guide and since you aren't hooked up to a trailer it wouldn't be ramping up green to try to calibrate. Since the brake controller has a limited lifetime warranty I would reach out to Curt to see if you can get a replacement.
    view full answer...
  • Easy to Install Brake Controller Recommendation for 2009 Ford F-750
    I have a really easy to use Curt brake controller solution for your 2009 Ford F-750 but we don't have any plug and play solutions like you are wanting. Instead though we have the Curt Echo Mobile part # C51180 which basically just plugs into an active 7-way and once synced to a smart phone is ready to tow. It's also a proportional brake controller which means it senses how hard you are applying the vehicle brakes and applies a proportional amount of braking pressure.
    view full answer...
  • Comparing the Curt Spectrum Brake Controller to Redarc Tow-Pro Elite
    By all accounts the Curt Spectrum Trailer Brake Controller # C51170 works well and is easy to use and install on most vehicles. It is a brand new item so not a lot of feedback has come in on it. I did learn a few things though after speaking with our install team about this controller. First, compared to the Redarc controller # RED44FR, the Curt Spectrum is easier to install. It can be surface mounted meaning that drilling is not necessarily required (depends on how you run the wiring)....
    view full answer...
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  • Where is Brake Controller Adapter Plug Located In 2002 Dodge Ram Pickup
    The green connector in your truck is not the correct plug. It is normally a blue plug like what I have shown in the photo that plugs into the adapter part # C51332 if you are using a Curt brake controller like part # C51170. There will be a port to plug into if the truck came with a factory 7-way plug just to the right of the emergency brake. If the 7-way plug was installed after-market, you will need to see how far the wires from the plug are extended so you can complete the install...
    view full answer...
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  • Recommended Brake Controller for 2018 Nissan Titan With Factory 7-Way
    For your 2018 Nissan Titan I very strongly recommend going with the Redarc Tow-Pro Elite item # RED44FR over the Curt Spectrum item # C51170, which does use Wiring Adapter item # C51382 to connect to your 2018 Nissan Titan. The Redarc Tow-Pro item # RED44FR, which you can install in your '18 Titan with Wiring Adapter item # 3050-S, is by far the superior option because it is not only extremely effective and responsive but its manual control knob makes it simple to use; the Tow-Pro can...
    view full answer...
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  • What Colors Will Curt Spectrum Brake Controller Light Up with Brake Pedal Pressed
    The Curt Spectrum # C51170 will light up from green to red (with the trailer connected) depending on what power setting you chose. This will be the case whether you are parked or heading down the road. I confirmed this with my contact at Curt. I've also attached a photo showing what the display will look like as well as a review video you can check out.
    view full answer...
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  • Does Curt TriFlex Plug Into 2007 Chevy TrailBlazer
    Even if your 2007 Chevy TrailBlazer has a factory 7-way there is not a plug underneath the dash for a trailer brake controller such as the Curt Spectrum # C51170; you will need to hardwire it with Wiring Adapter # C51515 though the wires will already be run if you have the factory 7-way (you should already have a factory 4-way). If you do not have the factory 7-way you will need to add the Universal Installation Kit for Trailer Brake Controllers # ETBC7. I've added a link on installation...
    view full answer...
  • Is 3.6V on 2020 Jeep Wrangler Unlimited Trailer Plug Abnormal
    If it's just a 4-Way Flat connector like the T-On # 118786 then I would be surprised to see that much power being pulled to the back of your 2020 Jeep Wrangler Unlimited, but if you have a 7-Way like what we find with the Wiring Kit # ETBC7 then 3.6V on the 12V power pin isn't out of the ordinary and you'll be fine. Attached are photos showing the functions per pin on both a 4-Way and a 7-Way connector for you to reference.
    view full answer...
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  • Troubleshooting a Curt Spectrum That Does not Go Through Calibration Sequence
    There could be a couple of reasons why your Curt Spectrum # C51170 is not calibrating, but it's likely due to your wiring. Even though you're using a plug in adapter # C51523, there still can be an issue with your vehicle wiring. I recommend physically checking your grounds, to make sure that it's to a clean secure surface. If your grounds are good, then check the white and black wires on the main module and make sure they're not flipped; If they are flip them and check again. I also...
    view full answer...
  • Single Red LED Lights Up When Brakes Pressed on Curt Spectrum Trailer Brake Controller
    What you have is in fact the Curt Spectrum Trailer Brake Controller # C51170. The single red light means it is working properly. More lights will light up as more brake power is asserted. This all depends on the settings of the brake controller. If you haven't changed any settings yet I recommend starting on page 11 of the manual to get it properly setup and adjusted. I have attached the link to the instructions below.
    view full answer...
  • Curt Spectrum - What Do Two Flashing Blue Lights Mean?
    Hello Trent, thanks for getting in touch. The two blue lights on the Curt Spectrum # C51170 knob mean the trailer is disconnected. The lights should flash blue when the trailer is disconnected or they will be steady blue with the brakes are pressed with no trailer connected. The green lights when towing are also normal. The knob will show green/red depending on your braking power setting. I have included the list of the LED color patterns for the knob below. If there is an issue you are...
    view full answer...
  • Recommended Plug and Play Brake Controller Adapter for a 2022 Nissan Pathfinder
    No, I am sorry we do not because Tekonsha did not make one for your 2022 Nissan Pathfinder. The Prodigy P3 Brake Controller item # 90195 includes a universal harness you can use but you'll need to cut and splice wires. Curt does have a plug in play adapter but it only works with their brake controllers. It is the Curt Custom Wiring Adapter for Trailer Brake Controllers item # C51382. It will allow you to easily install the Curt Spectrum Trailer Brake Controller item # C51170.
    view full answer...
  • Is Curt Spectrum Compatible With Demco Stay-IN-Play Duo Braking System
    The Demco Stay-IN-Play Duo Braking System # DM86VR is a standalone system so no brake controller is required. The same is true for our other supplemental braking systems for flat towing. The Stay-IN-Play senses the rate of your RV's deceleration and triggers your towed car's brakes to slow down at the same rate just like a proportional brake controller. The Curt Spectrum # C51170 is only designed to work with trailer brakes.
    view full answer...
  • Troubleshooting No Power To A Curt Spectrum Brake Controller In A 2022 Chevy Silverado 1500
    Hi Adam, Since you used the Curt Custom Wiring Adapter for Trailer Brake Controllers # C51525 to install the Curt Spectrum Trailer Brake Controller # C51170 you likely have either a blown trailer brake fuse or they just never installed one to begin with. The trailer brake fuse should be number 84 in the engine compartment fuse block. I recommend checking it and seeing if you're getting power or if you just need to add in a fuse to get power to the brake controller.
    view full answer...
  • Comparing The Redarc Tow-Pro Elite And Liberty Brake Controllers For A 2023 GMC Yukon XL
    Hey Brian, To determine if you have a 12v or 24v system all you have to do is look at the battery. From what I can see your Yukon should have a 12v battery like most other passenger vehicles so the only other notable difference aside from the user-controlled mode for off-roading would be that the Elite # RED44FR is compatible with triple-axle trailers and the Liberty # RED52VR can only go up to tandem axles. Since you don't plan on off-roading the Liberty # RED52VR is likely going to...
    view full answer...
  • Recommended Curt Spectrum Brake Controller W/ Plug-And-Play Adapter for 2022 GMC Sierra Elevation
    Hey Leo, for your 2022 GMC Sierra 1500 Elevation you are going to need the Curt Spectrum Brake Controller w/ Custom Harness - Dash Mounted Knob # C36QV which includes the plug and play adapter # C51525.
    view full answer...
  • Best Brake Controller for a 2024 Chevy Silverado 2500 w/Factory Tow Package
    I highly recommend using the Curt Echo Under-Dash controller and the plug-in adapter for your 2024 Chevy Silverado 2500, so you'll need the following parts: - Curt Echo Under-Dash Brake Controller # C27JR - Plug-In Adapter # C51525 I really like the Echo because it keeps you from having to put a "brick" in your truck cab since you set the controller settings through your phone. Once you get your settings in place the only thing you need your phone for is the manual override. If you'd...
    view full answer...
  • Comparing Redarc Liberty and Curt Spectrum Brake Controllers For a 2023 GMC Sierra 1500
    Personally, I have seen a lot fewer issues with the Redarc Tow-Pro Liberty # RED24FR than with the Curt Spectrum # C51170. The Spectrum was released in early 2018. Currently Redarc only offers the one size control knob. To install the Redarc Liberty # RED24FR in your 2023 GMC Sierra 1500 you will need the Tekonsha Pigtail # 3064-P and the Redarc to Tekonsha Adapter # 331-TPH-017. This will support up to 2 braking axles or 4 brake assemblies. If you go with the Curt Spectrum # C51170...
    view full answer...
  • Installing Redarc Tow-Pro Liberty on 2024 Chevrolet Silverado 2500 With Tow Package
    Yes, there is a way to make this work so you can plug the brake controller into the port under the dash on your 2024 Silverado 2500. Curt has the # C51525 wiring harness which is compatible with your truck. This wiring harness, along with the # 331-TPH-019 adapter, will allow you to install the # RED24FR without having to splice any wires.
    view full answer...
  • Is Curt Spectrum Trailer Brake Controller A Good Option For 2020 Chevy Silverado 1500
    The Curt Spectrum Trailer Brake Controller part # C51170 and the custom wiring adapter part # C51525 is a great option for the 2020 Chevy Silverado 1500 because of its simple out of the way installation. The knob can be installed in any easy to reach location at any orientation. The main unit installs out of the way and utilizes the custom adapter plug for your truck to plug into the factory port. I have attached the measurements of both the main unit and the knob for you to get an idea...
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  • Parts Needed to Install Curt C49UR Assure Brake Controller on 2021 Chevy Silverado
    To install the # C49UR Curt Assure brake controller in a 2021 Chevy Silverado, in addition to the controller you'll also need a # C51525 brake controller wiring harness. The harness plugs in to the connector located under the dash just left of the steering column next to the e-brake pedal as shown in the provided photo. I've linked to a demonstration video showing how the brake controller works.
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  • 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...
  • Curt Spectrum Trailer Brake Controller and Charge Line Circuits On a 2022 Chevy Silverado 1500 LTD
    The Curt Spectrum Trailer Brake Controller # C51170 will not charge the breakaway battery on your 2022 Chevrolet Silverado 1500 LTD. The charge line portion of the 7-way trailer connector runs on a separate terminal(see image). The charge line will be located in the 1 o'clock position while power from the brake controller is sent through the terminal in the 5 o'clock position. If you are not getting 12 volt power to this terminal you will want to check the fuses on your Silverado. The...
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  • Brake Controller For Towing Trailer With Electric Over Hydraulic Brakes 2021 Chevy Silverado 2500
    If your 2021 Chevrolet Silverado 2500 has a factory brake controller you will most likely need the Hydrastar Electric Over Hydraulic Actuator Adapter Module # HBA-CAM to allow your factory controller to operate correctly. Otherwise you will need a brake controller like the Curt Assure Trailer Brake Controller # C49UR which is capable of working on electric over hydraulic brakes. This controller will connect to the factory wiring using the Wiring Adapter # C51525.
    view full answer...
  • Can Curt Spectrum Brake Controller Bypass OEM Controller of 2020 Chevy Silverado 1500
    You can bypass the OEM brake controller of your 2020 Chevy Silverado 1500 with the Curt Spectrum part # C51170 but the truck will need to be taken to a dealer so they can reflash the the computer. The correct install harness for your truck and this controller is the part # C51525.
    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...
  • 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...
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  • Where Is Factory Trailer Brake Controller Port On 2021 Chevrolet Tahoe W/ Factory Tow Package?
    The factory trailer brake controller port on your 2021 Chevrolet Tahoe is located underneath the dash just to the left of the steering wheel. It will be taped to another harness so it may take a bit of looking to find. Keep in mind that if your Tahoe does not have the factory tow package, the connector may not be there and you would need to hardwire a controller. At this time (5/30/2021) the only plug-in adapter confirmed to fit is the Curt Custom Wiring Adapter for Trailer Brake Controllers...
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  • 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...
  • What Brake Controller Do You Recommend For My 2022 GMC Yukon XL AT4
    I prefer brake controllers that have proportional braking. Your trailer gets the same braking power that you are applying in your tow vehicle. With that in mind, my recommended brake controller is the Curt Spectrum Trailer Brake Controller - 1 to 4 Axles - Proportional - Dash Mount, part # C51170. You will also need the Curt Custom Wiring Adapter for Trailer Brake Controllers - Dual Plug In, part # C51525. This controller can be installed in your cab in any orientation and it plugs into...
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  • Will The Curt Spectrum Trailer Brake Controller C51170 Fit On a 2023 GMC Sierra 1500?
    Yes, the Curt Spectrum Trailer Brake Controller # C51170 will work on your 2023 GMC Sierra 1500. You will need the Curt Custom Wiring Adapter # C51525 to connect to the factory connecter under the dash on your Sierra.
    view full answer...
  • Troubleshooting Curt Spectrum Brake Controller # C51170 in a 2021 Chevrolet Silverado 2500HD
    We have not yet been able to install a Brake Controller # C51170 on a 2021 Chevrolet Silverado 2500. The thing that I do not like to hear is when you replaced the controller your issues changed. I would begin by checking the Curt Custom Wiring Adapter # C51525 for the ensure that it is receiving the correct power from your Silverado. You can use a Test Light # PTW2992 or Multimeter # PT29ZR to test the adapter wiring. With the ignition on you should have constant 12 volt power to the...
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  • How Does Curt Assure Brake Controller Install in 2022 Chevy Tahoe
    To install the Curt Assure brake controller part # C49UR in your 2022 Chevy Tahoe would only require the install harness part # C51525 which plugs right in under the dash. The Assure is Curt's answer to the P3 part # 90195 as it has a full screen that uses full words instead of codes to decipher that is also proportional.
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  • Which Trailer Wiring Harness is Needed to Install Curt Triflex NEXT in 2020 Chevy Silverado 1500
    The Curt TriFlex NEXT # C24VV that you have can be used in your 2020 Chevy Silverado 1500, and what you'd need is the wiring harness part # C51525.
    view full answer...
  • Wiring Harness to Install Curt Assure Brake Controller in 2021 Chevy Silverado 1500
    To install the Curt Assure brake controller part # C49UR in your 2021 Chevy Silverado 1500 the correct install harness is the # C51525.
    view full answer...
  • Can Redarc Tow Pro Elite Brake Controller Install in 2021 Yukon XL Denali
    The Redarc Tow Pro Elite brake controller part # RED44FR can install in your 2021 GMC Yukon XL but you'll need to use the correct brake controller install harness which is part # C51525. You'd have to cut the black connector off of the harness and wire it by color to the harness of the Redarc and you'd be set. This is one of the nicest controllers out there as it uses an inertia sensor to determine how much brake pressure to apply and only installs a small knob on the dash.
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  • Parts Needed to Install Redarc Tow Pro Elite in 2022 Chevy Tahoe
    Hey Matt, to install the Redarc Tow Pro Elite part # RED44FR you would need the install harness part # C51525. You would need to cut the black end off of this harness and then hardwire it to the Elite color for color though.
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  • Comparing the Curt Spectrum, Tekonsha Voyager iD, and Redarc Tow-Pro Elite Brake Controllers
    Hey John, thanks for reaching out! Before I dive into it, I just want to throw it out there that the Curt Spectrum # C36QV, Tekonsha Voyager iD # TK86DR, and the Redarc Tow-Pro Elite # RED65CR are all great brake controllers and you'll be happy with any of them. My input is just from my experience of comparing the controllers and the feedback we've received from other customers using them. Ultimately if I had to go with a brake controller it would be the Tow-Pro Elite # RED65CR because...
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  • Troubleshooting Curt Spectrum with Green Light that Stays On
    Hey Tom, so it is possible having your battery disconnected did cause your Curt Spectrum # C36QV to develop an internal problem. Hopefully it's temporary though and by just unplugging it and plugging it back it will allow it to work again. Let me know if the reset works or not.
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  • How do I Bypass the OEM Brake Controller in My 2015 Silverado 3500 to Use Curt Spectrum?
    Hello Andy, To bypass the factory brake controller so you can use the Curt Spectrum Brake Controller w/ Custom Harness - Dash Mounted Knob - Up to 4 Axles - Proportional # C36QV, you’ll want to start by removing the blue wire from the end of the brake controller harness that plugs into the truck. Once that wire is free, connect it to a length of 10-gauge wire, we recommend part # 10-1-1, which is sold by the foot. For example, if you need 20 feet, just enter “20” as the quantity when ordering. Next,...
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  • Will Curt Spectrum Brake Controller Work with a 2025 Chevy Silverado 1500 Without Tow Package
    Hey Lyman, thanks for reaching out! Your dealer should be installing a full 7-Way on your 2025 Silverado 1500, but you'll need to ask them if the brake controller harness will be present under the dash. The 2025 model year is still new enough that we don't have insight into whether that plug already exists or not for vehicle initially not having the tow package. If it does have the wiring then the Curt Spectrum Brake Controller w/ Custom Harness # C36QV will plug right into, but if it...
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  • Recommended Brake Controller and Plug In Harness for a 2024 GMC Sierra 1500
    That is all correct Tom! The Curt Spectrum Brake Controller w/ Custom Harness item # C36QV comes with everything you need to install the brake controller in your 2024 GMC Sierra 1500. 100% plug and play. The harness plugs into the connector located under the dash just to the left of the steering column next to the e-brake pedal. If you have any additional questions feel free to throw them into the comment box below.
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  • Curt Spectrum Brake Controller And Custom Harness For 2021 Chevy Silverado 1500
    Hey Blaize, thanks for reaching out. We have just the thing! Here is what you will need for your 2023 Chevy Silverado 1500: - Curt Spectrum Brake Controller w/ Custom Harness - Dash Mounted Knob - 1 to 4 Axles - Proportional # C36QV This comes with the Spectrum controller, control knob and custom harness for your Silverado, so everything you need. The custom harness included with this kit is part # C51525. The video linked below will show you an example of installation. Let me know if...
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  • Recommended Curt Spectrum Brake Controller W/ Plug-And-Play Adapter for 2022 GMC Sierra Elevation
    Hey Leo, for your 2022 GMC Sierra 1500 Elevation you are going to need the Curt Spectrum Brake Controller w/ Custom Harness - Dash Mounted Knob # C36QV which includes the plug and play adapter # C51525.
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  • Does The Curt Spectrum Brake Controller Dash Knob Light Up When Disconnected From The Trailer
    Hi Steve, The Curt Spectrum Brake Controller w/ Custom Harness # C36QV comes with a manual knob to mount to your dash that would allow you to manually activate the brakes, regardless of whether or not you have a trailer connected. Pressing the knob will bypass the requirements for it to activate and send a full 12 volts out to the 7-way to send out to the trailer's brakes. The control knob will go to sleep when disconnected from the trailer so it's not constantly lit up, but if you...
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  • Difference Between Curt Spectrum Brake Controllers for 2022 GMC Yukon SLT
    Hi Benjamin; the difference is in the custom wiring harness that comes with each. It looks like there are two possible factory connections on your 2022 GMC Yukon so it will be up to you to determine which one you need. If the factory connector looks like it matches the gray and red connector in the attached picture you need the # C36QV. If it matches the white connector you need # C88YV. What kind of trailer will you be towing?
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Info for this part was:

Employee Lindsey S
Edited by:
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Employee Jameson C
Expert Research:
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Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video by:
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Employee Wilson B
Updated by:
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Employee Amanda K
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