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Curt Spectrum Trailer Brake Controller - 1 to 4 Axles - Proportional - Dash Mount
Universal Wiring Adapter for Curt Trailer Brake Controllers

Part Numbers: C51170,C51515

Retail:$262.64

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Curt 360 Degrees Brake Controller - C51170
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Curt Spectrum Trailer Brake Controller - 1 to 4 Axles - Proportional - Dash Mount
part number: C51170

Proportional brake controller installs anywhere in your cab and at any orientation. User-friendly, dash-mounted control knob with 10 tri-color LEDs creates a clean, OEM look. Easily adjust braking output, switch between modes, and view diagnostics.

Features:

  • Brake controller activates trailer brakes in proportion to your vehicle's braking action
    • Automatically adjusts trailer's braking based on deceleration of tow vehicle
    • Activates immediately - no pausing like with time-delayed brake controllers
  • Push-button rotary control knob mounts on your dash for easy access and a clean appearance
    • Allows for convenient braking output and sensitivity adjustment
    • Equipped with 10 tri-color LEDs to display settings and diagnostics
    • Provides easily accessible manual override - just press knob to activate
  • Main module mounts out of sight and at any orientation
    • No more banging your knee on a bulky controller
    • No interference with airbags or other vehicle accessories
  • Triple-axis accelerometer is highly responsive to ensure smooth, uniform stopping action
    • Allows unit to automatically level and calibrate
  • Manual override functions as time-based for a slow reduction in trailer braking
  • Compatible with ABS brakes, cruise control, low-voltage, and pulse width modulation (PWM) systems
  • Multiple mounting options - choose between drill-mount or adhesive-mount
    • Mounting hardware and adhesive pads included
  • Plug-in, vehicle-specific brake-control adapter (sold separately) can be used for certain applications to reduce installation time
  • Made in the USA


Specs:

  • Application: trailers with up to 4 axles (8 brake assemblies)
    • Designed for use with electric or electric-over-hydraulic trailer brakes
    • Works with 12-volt vehicle electrical systems
  • Main module dimensions: 3" long x 3-1/2" wide x 7/8" tall
    • Horizontal distance between mounting holes (center to center): 3/4"
    • Vertical distance between mounting holes (center to center): 2-3/4"
  • Control knob diameter:
    • Base diameter: 1-3/4"
    • Knob diameter: 1"
  • Control knob overall height: 1-1/2"
  • Full length of wiring harnesses when connected: 48"
  • Limited lifetime warranty


Spectrum Dimensions

Whether you're a seasonal or weekend tower, you'll appreciate the out-of-the-way, easy-mount design and factory appearance of the Spectrum brake controller. The rotary knob allows for convenient adjustment, and it is lined with sleek, multi-color LEDs that provide valuable diagnostics.


Proportional Braking

With a proportional brake controller, you can get heavy-duty emergency braking, general braking, or slow-to-an-idle braking for your trailer automatically. The intensity with which your trailer brakes are activated and the rate at which they are applied are dependent on the deceleration of your tow vehicle. This means that, unlike time-delay controllers - which send the same amount of preset power to your trailer brakes every time - proportional controllers are able to adapt to every braking situation differently. So, if you slam on the brakes in your truck, your trailer brakes will activate with that same extreme intensity. And if you merely slow down as you approach a red light, your trailer will gradually brake in the same manner.


Once the Spectrum is mounted, it will sense - via an internal 3-axis accelerometer - how your tow vehicle brakes. This inertia-based sensor responds to the deceleration of your tow vehicle as you brake by signaling the controller to send out enough power to your trailer brakes so that they are activated with an intensity that matches. The result is uniform braking across your towing setup. No push-pull action - just smooth, proportional braking every time.


How to Use the Spectrum Brake Control

The Spectrum provides the smooth, precise braking action that you've come to expect from Curt brake controllers while allowing you to maintain the from-the-factory look of your vehicle. Make all of your braking adjustments from the dash-mounted rotary knob, which is equipped with 10 tri-color LEDs for simple monitoring. The LED lights change color to display different information about the controller, including which of the 4 operating modes is selected and multiple diagnostic indicator sequences.


Spectrum Control Knob

To switch between modes, press the control button in the center of the knob.


Spectrum Modes and Functions

Output: The output mode lets you adjust the maximum amount of power that will be applied to your trailer's brakes. You will need to adjust the output during the initial setup, but following that, you should only need to adjust the output control when the trailer load changes, if you switch trailers, or when road conditions change. Optimum output should cause your trailer brakes to function effectively without locking up.


Sensitivity: In sensitivity mode, you can fine-tune the power by adjusting the sensitivity of the internal sensor to get either more or less aggressive braking.


Boost the setting to get your trailer brakes to activate with more intensity right off the bat. This means that they will also reach maximum braking faster simply because they will start out at that higher intensity. This is particularly beneficial if you are towing a heavy load because the intensity required to stop that load may be far greater than that needed to halt your vehicle. Therefore, sending out more initial power to the trailer brakes - and causing them to reach maximum braking faster - allows you to better control the trailer so that it doesn't push your tow vehicle before coming to a complete stop.


You may need to adjust the sensitivity to accommodate for driver preference, trailer load changes, or changing road conditions.


Manual Control: Press and hold the button on the knob to activate the manual override.


Manual control mode is used to activate the trailer brakes independently of your tow vehicle. Doing this can have several advantages. Slowing the trailer down a bit as you travel can help to pull the trailer back in line behind your tow vehicle when you experience sway. You can also use the manual override to achieve a slow reduction in speed by creating just enough drag to slow your entire setup using only the trailer brakes. In addition, the manual override can help prevent a jackknife situation by limiting the momentum of your heavy trailer as you travel down steep hills.


When the manual control is pushed, the brake control will ramp up the trailer brakes until the maximum power output set is reached. If you realize that you need more power immediately, turn the control knob clockwise to reach maximum power faster.


The maximum power for the manual override can be chosen during installation via a small switch at the rear of the unit. The brake control unit is factory-set with the switch in the "ON" position, which allows 100% trailer braking power when manual control mode is actuated, regardless of the output control setting. When the switch is in the "OFF" position, the maximum override braking power will be determined by the output control setting.


The state of California requires that your trailer's brake lights illuminate when the manual override on your electric brake controller is activated. Therefore, to comply with state regulations, the Curt Spectrum offers a brake light activation feature. A small switch at the rear of the unit controls the unit's brake light activation feature, and it is factory-set in the "ON" position.


Simple, Out-of-the-Way Installation

Long gone are the days of knocking your knees on your brake controller. The 2-piece Spectrum can be installed nearly anywhere, and at any orientation.


Spectrum Control Knob LEDs Illuminated

First, determine your preferred location for the control knob. This is where you'll make braking adjustments, so it will need to be easily accessible while you're driving. Whether the knob is installed in a blank panel switch, on an open area of your center console, or somewhere on your dashboard, the simple, subtle design will provide a clean, uncluttered look. And the knob sits flush against any flat surface with no parts protruding behind the mounting location. This means that there is less chance of interference with wires and instrumentation behind your dash or console, so you have more mounting options than you might with other similar brake controllers.


Spectrum Control Unit Mounted Under Dash

Once you have determined where to mount the control knob, you'll need to find a good place to install the main unit. The only mounting restriction for the unit is that the included 4' long plug-in cable must be able to reach between the main unit and the knob.


The triple-axis motion-sensing accelerometer that is inside the main unit detects the inertia of your vehicle and trailer, and it uses this information to recognize the direction of travel and any change in position. Because this feature can read the direction of travel, the main unit can be mounted at any orientation for greater flexibility.


If your vehicle already has a plug-in brake controller wiring harness, just connect the main control module 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.


Both the control knob and main module can be mounted using the included hardware or adhesive pads for fast and easy installation.


For assistance in properly wiring the Curt Spectrum, please refer to the diagram below:


Spectrum Wiring Diagram

Installation Accessories

See 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.


Note: If a custom brake control wiring adapter is not available for your vehicle, a 30-amp circuit breaker (sold separately) may be required for installation.



51170 Curt Spectrum Trailer Brake Controller



California residents: click here



Universal Wiring Adapter for Curt Trailer Brake Controllers
part number: C51515

This wiring adapter is designed for vehicles that do not come equipped with a factory brake control wiring harness port. One end plugs into your Curt trailer brake controller while the other end splices into your vehicle's wiring.

Features:

  • Universal wiring adapter eases installation of your electric trailer brake controller
    • No need to wire brake controller directly to your vehicle
  • Wire end splices into your vehicle's wiring
    • Use on a vehicle that does not have a factory tow package or on one that has a brake control harness but is not equipped with a plug-in port
  • Connector end joins with the plug on your electric brake controller
    • Compatible with time-delayed and proportional brake controllers from Curt
    • Simple to plug and unplug control for removal
  • 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. Usually when this is done, a port is installed at your dash so that you can easily plug in a brake controller. However, if no port is present, you will have to splice into your wiring.


With this universal adapter, you can install your Curt brake controller without having to wire the controller directly to your vehicle. If your vehicle has a factory tow package, just splice the pigtail end of the adapter into your vehicle's factory brake control harness wiring, and then plug the other end of the adapter into the controller. If your vehicle doesn't have a factory tow package, you'll have to hardwire the pigtail end of the adapter into your vehicle's wiring. Because only the adapter is hardwired to your vehicle, you can unplug and remove your brake controller at any time to transfer it to another vehicle or securely stow it away.


If your vehicle is not equipped with a factory tow package, you will need to purchase additional equipment to ensure that the signals from your brake controller are sent to your trailer's brakes. We recommend etrailer.com's exclusive 7- and 4-way brake control installation kit (ETBC7 - sold separately).



51515 Curt Universal Quick Plug Brake Control Adaptor Harness with Pigtail



California residents: click here



Video of Curt Spectrum Trailer Brake Controller - 1 to 4 Axles - Proportional - Dash Mount


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




Video Transcript for Curt Brake Controller - Proportional Controller - C51170 Review

Speaker 1: Today taking a lot at the Curt Spectrum Trailer Brake Controller. The Spectrum Trailer Brake Controller gives you powerful precise braking operations in an extremely simple design inside your vehicle.The main module which is this part here. This can be mounted anywhere at any orientation. It can even be mounted behind the dash of the vehicle for a completely out of sight design.The interface is a single rotary knob with a push button in the center. This unit allows the driver to easily adjust the brake power output. So, rotating the knob clockwise increases the brake output.

Rotating the knob counter clockwise decreases the braking output. It features ten tri color LED's to show the automated power output of the control and the brightness can be adjusted as needed.Now, the main module, again this part here. This has a triple access motion sensing accelerometer that's able to detect the inertia of the vehicle and trailer no matter what. So, whatever speed and whatever grade your traveling on, up or downhill. The spectrum produces the exact amount of power needed for a smooth safe stop every single time.It also features automatic leveling and calibration so that eliminates set up requirements.

This is a fully compatible unit so it's able to operate up to eight trailer brakes at a time. So, anywhere from one to four axle trailers. It can be used on vehicles with ABS brakes and cruise control. It works with low voltage and PWM systems.Installation is quick and easy. Two installation options are included.

You'll notice that is has the pre-drilled holes here so you can actually drill this in so you can mount it using screws. This as well comes with a base and hardware so you can actually mount this to your dash and give it that OEM look, like it looks like it's from the factory that way. The design of the unit's going to match the design of the interior of your vehicle. So, really nice, again two installation options are included. Drill mount or surface adhesive mount and it does come with adhesive pads.It comes with a quick plug for easy plug and play installation.

This is designed to connect to vehicle specific harness plug and then plugged directly into your vehicle. It can be hardwired as well if there is not a plug available for your specific vehicle.The unit features four modes and three indicators. So, I'm going to spend some time going over those real quick. When it comes to the four modes that it offers. It offers manual, which is indicated by red LED's, brightness, which is indicated by white LED's, output which is green and red and sensitivity which is blue and red.Then, when it comes to the indicators, it's calibration, which it will ramp up so it will be like a dotted line going up. Overload, which will be flashing and then disconnected which is also flashing.Now, it does come with a quick reference guide so it shows you right here all the indicators. So, here's your four modes, again, manual, brightness, output, sensitivity, and it shows you the colors that go with it. Red, white, green and red, blue and red. Then you have calibration which is green, that'd be ramp up, so each line will appear individually and then you have overloaded which would be flashing red and yellow. Disconnected would be flashing blue.You definitely want to keep that quick reference guide handy. It's just a small card you can put in your wallet, in your glove compartment, anything like that. But, calibration simple indicates when the brake control is self calibrating it occurs when power is applied to the brake control and the trailer is connected.The overload indicator indicates when the brake control is in an overload or short circuit condition and then the disconnected indicators indicates when the trailer has been disconnected or if the brakes are pressed with no trailer connected at all.The manual override can be engaged by pushing the middle button and holding it down. So, pressing and holding the button during any mode activates the manual brake output. It functions as time based and ramps up over time. The red LED's light up in a sequence proportionally to the brake output. You can adjust the gain and active process by rotating the knob clockwise to increase and counter clockwise to decrease the gain while holding the button down.Then, releasing the button returns to the previous mode every time. The manual control can be set up to allow 100% of the units power to the trailer brakes or to limit power to the output control setting. This feature is set up at installation using the small switch at the rear of the unit.Also, brake light activation with the manual control is an optional setting as well. Some tow vehicles circuits do not allow power for brake lights from a second source so in these applications the brake light feature can be switch off using a second small switch at the rear of the unit.Then it also features sensitivity control so you can adjust the trailer brake aggressiveness simply by using the knob to increase or decrease the sensitivity. That's great because that can be adjusted for individual driver preference, trailer load changes, or changing road conditions.The product is a very clean system. It's very easy to get connected. I do want to point out that I already made my connections here but this can be disconnected really easily and then if you want to feed the wires through your dash, like through this mount here and through you dash for that nice OEM look, mounted to your dash. Each individual wire actually feeds into this plug right here. So, I already did the connecting but when it comes to you this will not be connected. The install guide walks you through how to do it. Very easy, only took me about, really just a few seconds, maybe up to a minute to get all those connected. Then once you have the wires connected and you have the wire routed where you want it simply just plugs in right there. That's all there is too it.So, nice, small, compact unit. Put it in the palm of my hand. You can see how it fits. How small it is. Same right here, just a nice small design. Compact, very clean, very easy to use.That's going to do it for today's look at the Curt Spectrum Trailer Brake Controller.



Customer Reviews

Curt Spectrum Trailer Brake Controller - 1 to 4 Axles - Proportional - Dash Mount - C51170

Universal Wiring Adapter for Curt Trailer Brake Controllers - C51515

Average Customer Rating:  4.8 out of 5 stars   (239 Customer Reviews)

Proportional brake controller installs anywhere in your cab and at any orientation. User-friendly, dash-mounted control knob with 10 tri-color LEDs creates a clean, OEM look. Easily adjust braking output, switch between modes, and view diagnostics. This wiring adapter is designed for vehicles that do not come equipped with a factory brake control wiring harness port. One end plugs into your Curt trailer brake controller while the other end splices into your vehicle's wiring.

- C51170
by: Matthew05/17/2019

Fits perfect if you want the more factory install look. Easy to mount and the control box is out of site with nothing to bash you knee into under the dash. Haven’t hauled my trailer yet but, I like how clean the finished product looks 642918



- C51170
by: Richard S C04/03/2019

Honda Ridgeline 2019 Install Plan to tow an RPOD 195 Travel Trailer as soon as I pick it up Simple Installation Didn't need to remove dash to install, as free space behind this location. Knob on lower left of Dash. Module Tie Wrapped to the Parking Brake Bracket under the Dash. Used the C51392 Wiring adapter to connect the Brake Controller to the Truck. Pictures of Dash Install only. Haven't functionally tested yet as I am waiting on Delivery of the Trailer. 616735



- C51515
by: David03/27/2019

Not much to say about this. Is what it is. Plugs in to the curt triflex brake controller nice and firm. A little longer (it’s about 2’ long) than I needed in my 2011 Silverado but the excess wire tucked away nicely. 614612



- C51170
by: Johnboy Willis05/03/2019

Decided I wanted a high quality brake controller without the clunky box on the dash and this seemed like the best out there. Super easy install. I bought the extra cable for my Silverado and it all plugged in perfectly. I saw somebody complain about tiny connectors. Don't listen to them. This thing is excellent and the quality is clearly top tier. The set up was a breeze and on our first trip out I got it dialed in with no problems. Works better than my previous controller by far. 637364



- C51170
by: James03/14/2019

I could not have imagined an easier, and more sleek, trailer brake controller to install. I put this into our 2019 4Runner, and it looks great, and I am not hitting my knee on the old style controller like we had in our previous tow vehicle. With the additional wiring harness that etrailer sells for the 4Runner it was simple plug and play. No need to struggle with finding correct wire lengths, just used some zip ties to have everything be tidy and clean. Thanks etrailer! 611935



- C51515
by: Robert09/30/2018

Product was easily located on website and was exactly what I was looking for. I had forgotten to take off of my old vehice before I sold it, so this allows me to plugin my Curt brake controller without having to cut the connector off of it. 570389



- C51515
by: Christopher03/12/2018

The items I ordered I got in a timely manner great job 484308



- C51515
by: BiscuitsNGravy10/21/2013

I own a 2008 Chevy Silverado. I ordered the brake controller - C51515 and the universal wiring adapter on Friday and received it on Tuesday. My friend who is a mechanic installed it in about an hour on Wednesday. I towed my camper trailer to Lincoln, NE (about a 5 hour trip) on Thursday and returned on Sunday. After reading the settings instructions, all stops were made smooth and firm. Etrailer.com was great and the Curt Trailer Brake Controller is excellent! 104632


Comments

I have enjoyed the use of the electric brake controller. The stops are always safe and smooth. Im glad I got it for my truck and Ive never had a problem with it. I just need to get out and use my camper more! The initial contact with etrailer.com was very favorable and I will do business with them again when I need something for my trailers or tow vehicles.

BiscuitsNGravy - 10/21/2014

7356

- C51515
by: Ted07/03/2014

I purchased the wiring harness to aid with hooking up the Curt Brake Controller I had previously purchased. The shipment was fast. The product was perfect. The on-line installation video was perfect and allowed me to complete the installation like a professional. I have never purchased anything from etrailer.com .... but should I ever need anything in the future, they will be my first choice. 139007


Comments

Perfectly. No issues at all with wiring or controller.

Ted - 07/03/2015

13016

- C51515
by: Mainly Dave07/22/2015

Recently used this kit to install electronic brakes on a 2014 FJ Cruised. Absolutely essential and worth every penny! Instructions straight forward and everything included! 213491


Comments

Have been using this product for a year now. Commonly haul 2-3 tons. Absolutely no problems and the braking system works well. Adjustments based on load are easy. Highly recommend!

Mainly D - 07/22/2016

19561

- C51515
by: Frank S02/14/2014

this went into my VW Touareg which requires the relay modification described in the Technical Bulletin. Because ground and +12V is already present in the harness, instead of running additional cables, I soldered the relay right into the cable, making it a clean plug and play setup which is 100% removable. I also bought the VW housing and wire kit to complete the install 116584



- C51170
by: Bob In Florida01/12/2019

After knocking my knee into my brake control for the last 20 years with the new GMC Savana I wanted something a little different. Technology has moved trailer brakes forward quite a bit and Etrailer has an immense amount of information! I original looked at the Tekonsha Prodigy RF Wireless Trailer Brake Controller but it would take up a valuable power outlet with the control unit but it's kind of trailer specific as the control mounts to the trailer you never know when you might have to tow another trailer and was leery of the control wandering around the console, Next up was the Redarc Tow-Pro Elite Trailer Brake Controller but did not like the control mounting options. Then ran across the Tuson DirecLink Lite Trailer Brake Controller crazy amounts of technology in this unit but again concerns over the remote so after lots of head scratching the Curt Spectrum seemed like the best choice. Easy install very small control box mounted easily with the included double stick tape under the dash. I moved my traction control button to the left where a blank filler was you have to cut a little piece of it off to get it into the hole as the are "keyed" to specific locations I guess but worked perfectly! I left enough slack in the connection so I can simply disconnect the harness if I am not towing for awhile as the blue indicator lights come on every time you hit the brake if its disconnected. Just installed it so I will send an update after our first trip with the new rig but I'm thinking it will work as described. Thanks again etrailer fast shipping great information!!!! 597075



- C51170
by: Gary10/13/2018

Was an easy install for my 2018 Grand Cherokee with the addition of the specific cable adapter. I was able to secure the main unit under the dash on-top of the diagnostic port bracket and then run the wire for the dial up the drivers side of the dash so that it is concealed once the door is closed. The dial now sits on-top of the left side of the dash by the windshield pillar. I wanted to make this a temporary install incase I traded the truck in the near future. I have not hooked up a trailer yet so can not give a review on how well it works. 574127



- C51515
by: George D10/17/2015

good quality and works with brake controller so you don't have to rig it up its all there glad i bought it thanks 230175


Comments

Very easy to do still working great

George D - 10/16/2016

21546

- C51515
by: Kent E.06/05/2016

Wiring up a brake controller can be tricky. Routing the wire from the hitch to the firewall and finding the right wire on the brake are the hardest part, but etrailer will do their best to help. Consider running the wire inside the car along the door bottom just under the carpet. This avoids problems with the tie-wraps under the car -- there just isn't anywhere to tie wrap under the middle of the car. Use "loom clamps" ordered separately to solve this problem, if you go under the car. To find the right brake wire without cutting insulation, use the fish wire from the hitch install to contact the end of the wire inside the connector (from the back). Then touch the fish wire with the continuity tester and apply the brake pedal. My brake had a four wire connector and I found the right one on the second try. If you find a hole in the firewall with a rubber plug in it, don't discard the plug. Make a short slice in it with a razor blade and push the wires through. You may have to work the wires around to get them through the carpet. Be patient. Be sure to watch all the videos and allow plenty of time, taking a break before you tackle the hard parts. Rest assured that doing it yourself is better than allowing UHaul to cut corners and charge you labor. :-) If you are doing the hitch install and four-wire harness, those are much easier. If you are installing the hitch alone, be sure to have a magnet wand for when you push the bolt up into the frame rail. If I had it to do again, I would use a little electrical tape to hold the bolts down so a slight bump wouldn't knock them up. 257414


Comments

Ive not had any trouble with the hitch or the brake controller. I can tow my tear trailer anywhere I want and the hitch protects my mufflers from damage when I go offroad. Nice extra benefit.

Kent E - 01/23/2018

33496

- C51170
by: Logan09/24/2018

I've I stalked it but haven't used it yet because I thought the right adapter came with. I like the sleek fit to it so nothings hitting my knees etc. I recommend the design I stall forsure. Not sure how good it works yet like I said. I have a 2006 ford f150 fx4. 568517


Comments

For your 2006 Ford F150, youd need the # C51322
Curt Custom Wiring Adapter for Trailer Brake Controllers - Dual Plug In
$8.89
wiring harness. This will allow a plug and play installation. Once end will plug into the brake controller unit, the other into the gray tow package plug shown in the photo you provided.

-- Mike L - 09/25/2018

44003

- C51170
by: Wayne08/25/2018

I was looking for a unit that was out of way and would look like it belonged in the cab of the Chevy Colorado pickup. The Curt Spectrum control was easy to install under the dash and out of the way. The LED knob went on the dash with the wires going through the dash out of sight. 557904



- C51170
by: Fred06/10/2019

When installing the control knob I could not use the screw mount base. The epoxy ( or what ever it is) on the back of the knob assembly that covers the wire connection kept the knob from snapping into the mount. I had to use the other mount to install the knob, hopefully it will stay in place. 655996



- C51170
by: George05/26/2019

2019 Honda Ridgeline RTL AWD— The Curt Spectrum C51170 controller and harness C51392 was exactly as I had read it would be! All connections hooked up as described and all connectors fit! The knob works as described but I have yet to hook up trailer to get response from the accelerometer! I’m sure the quality shown it will work fine! Only problem I had was access under the dash. Thanks Bill and etrailer! Pictures attached! 647206



- C51515
by: Edward06/14/2019

product looks good havent installed yet but pulled my trailer without it cant wait to see the difference wene the trailer brakes are back working as they should and have heard good things about the curties brand ! 659132



- C51515
by: Jeffrey06/08/2019

Was the correct part. Works great 655092



- C51515
by: Bill06/07/2019

Fast and Great Servive 656135



- C51515
by: Darrel whipple05/31/2019

I beleave I receive everything I ordered and it all worked well 650742



- C51515
by: Reynaldo05/31/2019

Great 650536



- C51170
by: Luther05/04/2019

No trouble hooking it up with the plug and play connector,took about 1/2 hr and works great 638208



- C51515
by: Marc04/27/2019

Installed this brake controller last weekend. etrailer has helpful videos that also include associated products with part numbers. Watching the video and checking other references confirmed I needed the wiring harness, too. So I ordered both and it made the install go smoothly. 635468



- C51515
by: Alan04/20/2019

Easily installed 633763



- C51170
by: Dennis04/13/2019

Very easy to figure out. Wish they had an online vehicle wire color reference based on year make model and style. Did find a video on line to find the wires and metered them out which wasn’t too hard. I would buy this again 628186



- C51515
by: Chris03/27/2019

Great quality. Thank you again. 614577



- C51515
by: Humphrey,02/15/2019

Easy install 605452



- C51515
by: Jon02/11/2019

This made to real simple for the connec tions. 604158



- C51515
by: Scot02/03/2019

Great parts at a great price. 602453



- C51515
by: Larry01/24/2019

The plug fit my controller making it easier to hook up 599972



- C51515
by: Doug12/05/2018

I works great. Top quality! 588424



- C51515
by: Jim11/13/2018

Works well. 582452



- C51515
by: Jonathan K.10/20/2018

I am completely satisfied. The package arrived quickly and I was able to install on my truck the same day with help from the installation videos. I will definitely purchase from etrailer.com in the future. I have saved money by spending with etrailer.com and doing the upgrades myself. 576833



- C51170
by: Mike10/14/2018

Great product. Easy to install. Easy to setup and program. 574466



- C51170
by: Doug r.10/11/2018

fast shipping. easy to install,makes nice factory look. 573455



- C51515
by: Trevor10/03/2018

Simple and easy to install. Helps make a cleaner look 571173



- C51515
by: Jeff09/18/2018

made wiring painless 566423



- C51515
by: Robert08/21/2018

Packed well and delivered on time. Easy installation, and Etrailer always provides additional resources if you get stuck and need help. Great company 556678



- C51515
by: Ross08/17/2018

Easy to use, great customer service. 554693



- C51515
by: Noob07/20/2018

Great product, makes a brake controller install easy. 543674



- C51515
by: Robert07/10/2018

This was my first purchase from etrailer. I will definitely come back again and again. Fast shipping. You all are great. Thank you so much. 540026



- C51170
by: Alan06/18/2018

received my package two days before i expected it. 523613



- C51515
by: Matt06/18/2018

Works very well! Nice product and easy install! Very satisfied! 523773



- C51515
by: Peter06/17/2018

Excellent fantastic service. 522824



- C51515
by: Don06/11/2018

Great quality product ! 520809



- C51515
by: Cliff06/08/2018

Worked great and went on very easy. Feels a lot better to tow a trailer with brakes!! 519530



- C51515
by: James06/01/2018

Easy install, nothing to it! 515410


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  • 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 # 331-EBRH-ACCV2, 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
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  • Comparing the Curt Spectrum Brake Controller and Redarc Tow-Pro Elite for a 2016 Audi Q5
  • Both the Curt Spectrum # C51170 and the Redarc Tow-Pro Elite # 331-EBRH-ACCV2 are excellent brake controller options for your 2016 Audi Q5 but in comparison I recommend going with the Tow-Pro Elite over the Spectrum. Although both controllers can be used as proportional brake controllers (they activate your trailer brakes at the same time and with the same intensity as the brakes on your Q5) the Tow-Pro Elite can also be switched to "User Control" mode which means your trailer brakes
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  • Length of the Curt Spectrum Brake Controller Wiring
  • The Curt Spectrum Trailer Brake Controller # C51170 has a wiring harness that is 48 inches long between the knob and the concealed box. I reached out to the manufacturer to confirm that measurement for you. If you have the factory 7-way on your 2016 Honda Pilot then you will simply use the Custom wiring harness # C51392 which has a 24 inch length to connect your controller to your factory wiring harness. If you do not have the factory 7-way, then you will want the universal wiring
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  • Can Curt Spectrum Brake Controller Install in 2011 Ford F-350 with Integrated Brake Controller
  • The Ford factory brake controller that is in the dash does not have to be removed. You will need to unplug the connector under the dash and plug in the # C51432 adapter for the Curt Spectrum brake controller # C51170 to the factory brake controller plug behind the dash. The vehicle will need the computer flashed so it will keep from searching for the connection to the OEM brake controller in the future, eliminating any fault codes. This will usually have to be done at the Ford Dealer.
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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
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  • Wiring Harness for Curt Spectrum Trailer Brake Controller on 2016 Jeep Wrangler Unlimited
  • The correct adapter for the Curt Spectrum # C51170 trailer brake controller on your 2016 Jeep Wrangler Unlimited is Wiring Adapter for Curt Trailer Brake Controllers # C51515. One end of this adapter will plug into your Spectrum brake controller and the other end will splice into your Jeep's brake controller wiring; you can use Butt Connectors # 05731-5 to help make this connection. I have added a link to a video review of Adapter # C51515 for you to check out as well.
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  • Is Curt Spectrum Trailer Brake Controller a Good Option for 2018 Chevy Silverado 1500
  • The Curt Spectrum Trailer Brake Controller # C51170 is a great choice for a brake controller in your 2018 Chevy Silverado 1500 because it is easy to use with the control knob you referenced and is a proportional controller so you will get smooth braking. To install it in your '18 Silverado you would also need the Curt Custom Wiring Adapter # C51451. The only other brake controller I recommend checking out is the Curt Echo Mobile Trailer Brake Controller # C51180 because this is even
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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
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  • Can Trailer Brake Controller be Used on Harley Davidson Motorcycle Pulling Small Trailer
  • The Curt Spectrum Trailer Brake Controller # C51170 can be absolutely be used with your Harley pulling a small trailer for your pups (and in the process making your wife happy). Normally with a motorcycle you want to use a time-delayed controller like the Curt Discovery # C51120 but since the Spectrum's main unit can be mounted at any angle, this is one of the proportional controllers that can be used so long as you can find a good mounting point for both the main unit and the control
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  • Trailer Disconnected Indictor When Trailer Is Disconnected From Curt Spectrum Brake Controller
  • I will be happy to assist you with the issue you are having with the Curt Spectrum Trailer Brake Controller # C51170. I reached out to my contact at Curt and they indicated that the disconnected light only comes on when you hit the brakes with your trailer disconnected. Curt advised that there is no way to disable this feature without disconnecting the entire unit.
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  • Dimensions of Components in Curt Spectrum Trailer Brake Controller C51170
  • On the Curt Spectrum Trailer Brake Controller # C51170 the round base of the rotary knob component measures 1-3/4-inches in diameter and has a depth of 1-1/2-inches. The main control box component measures 3 x 3-1/2-inches overall and has mounting holes spaced apart on center at 3/4 x 2-3/4-inches. I made a photo with these dimensions which is linked for you. The Spectrum does have a 10-LED display but the controller output is not limited to only 10 specific power and boost settings.
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  • Dimension of Bracket for Curt Spectrum Trailer Brake Controller
  • I went out to our warehouse to measure the bracket for the Curt Spectrum Trailer Brake Controller # C51170 that you referenced and found that it has an outside diameter of just under 2 inches (1-15/16 inches to be exact). I have attached the image you sent with this dimension labeled that you can also use for reference.
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  • Do the Lights Flash on the Curt Spectrum Trailer Brake Controller with Trailer Unconnected
  • The two blue lights (see photo) on each side of the Curt Spectrum Trailer Brake Controller part # C51170 will only display when a trailer is disconnected and the brake pedal is applied. You cannot turn this feature off but you can dim it with the included dimmer feature. You can also mount the knob out of direct eyesight which is more or less what it is designed for. If you can tell me what vehicle you will be installing the Spectrum brake controller on, I would be glad to check if
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  • Curt Spectrum Trailer Brake Controller on a 2019 Subaru Ascent
  • You will have to hardwire the Curt Spectrum Brake Controller part # C51170 to your 2019 Subaru Outback Wagon but it is a pretty simple process. You will need to first start with a 4-way confirmed as a fit for your vehicle. For that you'd want the Tekonsha part # 118467 which is a plug and play style of install. 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
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  • Electric Trailer Brake Controller and Wiring Harness for 2015 Toyota Tacoma
  • To use the Curt Spectrum Trailer Brake Controller # C51170 on your 2015 Toyota Tacoma, you will want the Curt Custom Wiring Adapter # C51362. It sounds like you may have a pigtail harness like # 3040-S with exposed wires on one end and this adapter plug for under your dash on the other. If that is the case you may use that, but you will need to then use butt connectors and cut the quick connect end of your brake controller. I've attached a couple videos to assist.
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  • Do I Need a Brake Controller for a 2007 Chevy Tahoe with Tow Package Towing a 2017 Jayco Baja
  • Assuming your trailer has brakes, you may still need a brake controller. GM started putting factory brake controllers in their trucks and SUVs in 2007, but it was an option. The factory brake controller did not come standard with the tow package. If you have a factory brake controller, you will see a black square with a horizontal lever and two buttons (+ and -) just below your light controls to the left of your steering wheel. If you don't have that, then you will need to add a brake
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  • How Does Curt Spectrum Brake Controller Install on 1994 Chevy Silverado
  • You'd have to hardwire the install of the Curt Spectrum Trailer Brake Controller # C51170 in your 1994 Chevy Silverado just like a standard brake controller as your vehicle does not come with any brake controller wiring from the factory.You will need to start with a 4-way (if you do not have one). For that you would want the # 18252. 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
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  • Availability of Brake Controller Plug-In Adapter for 2016 Jeep Wrangler
  • There is not a plug-and-play brake controller harness available for your 2016 Jeep Wrangler simply because the Wrangler isn't equipped with a port to which one could plug into. If your Wrangler currently has a standard 4-Flat connector this will need to be converted to a 7-Way in order to use a brake controller like the excellent Curt Spectrum # C51170 that you referenced. To do this I recommend using the Wiring Kit # ETBC7, which includes all the necessary wiring and circuit breakers
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  • Where to Access Brake Signal for Curt Spectrum Brake Controller in 2010 Mercedes-Benz ML350 BlueTec
  • To correct the unwanted braking action from your Curt Spectrum # C51170 caused by the 3.6V monitoring signal generated by your 2010 Mercedes-Benz ML350 BlueTec you'll need to access the brake light signal at a location other than at the brake light switch. You can tap into the circuit at the CHMSL (center high-mount stop light) or at one of the two main brake lights and run that wire back to the controller's RED input trigger wire. My contact at Curt confirmed this and that you do not
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  • Troubleshooting Lack of Brake Controller Power on 2019 Honda Ridgeline with Custom Harness
  • The Curt Spectrum Trailer Brake Controller - 1 to 4 Axles - Proportional - Dash Mount # C51170 along with the Curt wiring adapter # C51392 is a confirmed fit for 2019 Honda Ridgeline according to the manufacturer. You can use a circuit tester like # PTW2992 to check for the 12V power on that harness. If you have power you should have lights unless there is a connection issue. Look for bent pins reconnect. Then in engine compartment look at fuse box B located by the brake fluid
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  • Troubleshooting Curt Brake Controller Installation in 2007 GMC Sierra New Body Style
  • First I suggest making sure you are testing the brake circuit pin on your Sierra's 7-way trailer socket. If you refer to the linked photo of a trailer connector you will note the brake controller's output is carried on the pin at the 5:00 position; the ground is at the 7:00 position. If you happened to test the 12V auxiliary power circuit, carried on the pin at the 2:00 position, it will have power at all times. I see that you purchased Curt Universal Wiring Adapter # C51515 which
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  • Adapter for Curt Venture Brake Controller on VW Touareg
  • In order to use the Universal Wiring Adapter for Curt Trailer Brake Controllers # C51515 with your Curt Venturer # C51110 brake controller, you will need additional parts from your Volkswagen dealer. Please see the attached help article on installing a brake controller in 2005 and up Volkswagen Touareg's. It states in part: "To install a brake control on a 2005-current Volkswagen Touareg or Porsche Cayenne using the factory brake control connector, you will need to assemble a brake
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  • Brake Controller Recommendation for a 2012 Mercedes GL450
  • In order to install a trailer brake controller on your 2012 Mercedes GL450 it will require hardwiring in the controller unless the Mercedes dealer has a wiring harness specific for a brake controller and your vehicle. If they do then you will need to wire in the controller to the Mercedes harness by function. On a brake controller, the wire functions are as follows: White is ground Black is 12 volt power Blue is output to the trailer brakes Red is input from the brake switch On
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  • Brake Control Harness # 51515 Installation Process in 2008 and 2013 Chevrolet Silverados
  • The Curt Brake Controller Harness you referenced, part # C51515, can be used for both the 2008 and 2013 model years of the Chevrolet Silverado since it is a universal-fit harness. For your 2013 Silverado you will want to follow the procedure outlined in the linked article. Please refer to the photo provided which shows the vehicle tow package wiring that can be found under the dash. You will connect these wires to the leads on the Curt harness as per the article, using butt connectors
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  • Brake Controller and Install Harness Recommendation for a 2006 Jeep Commander
  • The correct Curt brake controller install harness you will need for your 2006 Jeep Commander is the part # C51515 that you referenced. I would recommend you go with a proportional brake controller with it like the Curt Triflex part # C51140 as it will sense the amount of braking you are applying with your vehicle and will provide a proportional amount of braking power to the trailer. Some models will require a wiring kit to run wire to the battery. This may require drilling a hole
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  • How to Install the Curt Wiring adapter # C51515 on a 2008 Chevrolet Silverado
  • To install the Curt Wiring adapter # C51515 in your 2008 Chevrolet Silverado you will need to hardwire it under the dash. To be sure that the wire bundle you found under the dash is the correct set of wires I would check the white tag for any indication as to what each wire is for. If none of them have labeling then it would be best to test their functions with a circuit tester like part # PTW2979. You will then connect the following wires from the Curt adapter to the following functions: Blue
    view full answer...

  • Wiring Adapter for Curt Electric Brake Controller on 2016 Toyota Tacoma
  • We do offer the Universal Wiring Adapter for Curt Trailer Brake Controllers # C51515. This adapter will connect with the plug on the back of the Curt electric brake controller on one end and the other end will allow you to hardwire install the brake controller. If you need to add a 7-Way to your tow vehicle, the # C51515 adapter will work well with the Universal Installation Kit for Electric Trailer Brake Controller # ETBC7. The instructions for this hardwire installation are linked
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  • When Does Brake Output Circuit of Vehicle 7-Way Have Voltage
  • The brake output circuit on a 7-way (5:00 pin) will only have as much voltage on it as the brake controller is sending. Typically this going to depend on the amount of gain selected on the controller and other factors like brake controller style and ramp up speed of the controller. The only time the circuit would have voltage without the brake pedal being applied would be if you had the manual override lever of the controller slid. I attached a couple help articles on brake controllers
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  • Troubleshooting Brake Controller Not Allowing Truck To Start
  • For your 2014 Chevy Suburban, no plug is present under the dash, but the needed wires are already run. You will connect the brake controller wiring with the vehicle wiring already present under the dash using the Universal Wiring Adapter for Curt Trailer Brake Controllers # C51515. It seems the 2007 to 2013 brake controller wiring was carried over into 2014 for your vehicle. I've attached and article to assist. The issue you are experiencing is most likely because you have a plug
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  • Custom Wiring Adapter for 2012 Chevy Silverado Curt Brake Controller
  • If you are looking for the custom adapter for the Curt Reflex Trailer Brake Controller # C51130, you will need the Universal Wiring Adapter for Curt Trailer Brake Controllers # C51515. Unfortunately, no factory plug is present under the dash on your truck, but the needed wires are already run. You will connect the brake controller wiring with the vehicle wiring already present under the dash. It is a two foot long wire. These are twelve gauge wires with a protective coating to prevent
    view full answer...

  • Troubleshooting Curt Venturer Brake Controller Installed on 2011 Dodge Ram 1500 Pickup
  • Getting a single green LED on the display indicates that there's no trailer connected. Since you're getting this with the trailer connected, it would seem to indicate that the brake controller isn't 'reading' the trailer for some reason. The most common reason for this to happen would be a dirty, corroded or damaged connector on the vehicle or the trailer. Examine the trailer connectors, and ensure everything is clean. If you see any white or green corrosion on the pins or sockets of the
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  • White Ground Wire Is Taped To Orange Wire 2009 GMC Sierra 1500 Brake Controller Install
  • You want to use the white wire in your photo for the ground. The other orange wire is the CHMSL circuit which stands for center high mount stop light wire. It is not used by a brake controller so you can tape it up and stow it out of the way. You will need 4 wires to install the brake controller, 12 volt power (red and black in your photo), trailer brake output (solid blue in your photo), stoplight circuit (light blue with stripe in your photo) and ground (white).
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Info for these parts were:

Edited by:
Lindsey S
Expert Research:
Michael H
Expert Research:
Jameson C
Video Edited:
Jacob T
Expert Research:
John H
Expert Research:
Adam R
Installed by:
Cole B
Video by:
Chris R
Photos by:
Stacy F
Written by:
Kristina F
Edited by:
Leah B
Expert Research:
Michael L
Video by:
Andrew K
Installed by:
Jeff D
Video by:
Joshua S
Test Fit:
Nicholas E
Video Edited:
Andrew L
Video Edited:
Dustin K
Photos by:
Jim W
Test Fit:
Shane T
Video Edited:
Sue W
Updated by:
Sarah W
Test Fit:
Brent H

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