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Curt Echo Under-Dash Bluetooth Brake Controller w/ Custom Harness - Up to 4 Axles - Proportional
Part Number: C74SV
In Stock
$329.95
1995 Ducati Monster
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- All Info
- Reviews (22)
- Q & A (0)
- Videos (1)
- Photos
CURT Trailer Brake Controller - C74SV
Highlights
- Custom Fit for Your Vehicle: Works with your vehicle's existing wiring.
- Smooth, controlled stops: Proportional braking syncs trailer and tow vehicle for steady deceleration.
- Clean, out-of-sight install: Mounts under the dash with plug-and-play custom harness—no splicing.
- Simple smartphone control: Adjust output, sensitivity, and manual override through Bluetooth app.
- Ready for any trailer setup: Works with 1 to 4 axles and electric trailer brakes.
- Switch trailers fast: Save multiple profiles so settings load instantly for each trailer.
Features to know about
Clears Up Dash Space: Hidden Under the Dashboard
Bulky brake boxes can clutter your dash and get in the way. This one mounts out of sight under the dashboard, leaving your interior clean and your knees free. The main unit measures just 3-3/8" long x 3" wide x 7/8" thick and can mount at any angle thanks to its 3-axis accelerometer. Once installed, it senses direction of travel automatically, so you still get smooth proportional braking without sacrificing space.
Controls Everything from Your Phone: Bluetooth and the OneControl App
Instead of knobs or dials, this controller connects to your smartphone with Bluetooth using the OneControl app. You can set max output, adjust sensitivity, and apply the manual override right on the screen. The app works offline once downloaded and can store multiple trailer profiles so your preferred settings are always ready. It’s quick to pair—about 5 seconds—and continues to function safely even if the Bluetooth link drops, using your last saved settings.
Smooth Stops Every Time: Proportional Braking for up to 4 Axles
The built-in 3-axis accelerometer senses how fast you’re slowing down and matches your trailer brakes to that motion. Whether you brake lightly or hard, it keeps everything in sync so there’s no jerky push or pull. It works with 1 to 4 axles (8 brake assemblies) and supports electric trailer brakes. That means smooth stops, less wear on tires, and more confidence when towing heavy loads.
Installs Fast with Plug-In Harness: No Splicing Needed
You don’t have to mess with cutting or soldering wires. The included custom-fit harness plugs right into your factory tow wiring port under the dash. Mount the compact box using the adhesive pad or zip ties, plug in your trailer’s 7-way connector, and the system calibrates in seconds. When the LED turns green, you’re ready to tow—clean install, no hardwiring required.
Ready for Multiple Rigs: Save Profiles and Swap Easily
If you tow more than one trailer, this setup makes switching simple. You can save multiple profiles in the app for both trailers and vehicles so every load brakes exactly how you like it. Just swipe to pick the setup you need and hit the road—no reprogramming between trips.
Specs
Application
- Trailers: 1 to 4 axles (8 brake assemblies)
- Brake compatibility: Electric trailer brakes
Dimensions
- Main unit dimensions: 3-3/8" long x 3" wide x 7/8" thick
Smart Device Requirements
- Apple OS: 5.0 and newer
- Android OS: 4.3 and newer
- 1. Manual Override: This big orange button in the middle of the app is your manual override. Press and hold the button, and the brake controller will smoothly apply the trailer brakes without applying your vehicle's brakes.
- 2. Brake Output Indicator: The outer ring gives you a visual indicator of how much power is being applied to the trailer brakes. This is determined by your max output setting.
- 3. Max Output: Braking output is the maximum amount of power that will be applied to your trailer's brakes.
- 4. Sensitivity Level: This controls the aggressiveness of your trailer's braking, meaning how quickly the brakes reach the max output level.
- 5. Vehicle Hazard Lights: If you turn on your vehicle's hazard lights, there’s a chance the trailer brakes will pulse on and off as the lights flash. Turn this setting on any time you activate your hazard lights to prevent this problem.
Warranty
- Brake controller: Limited lifetime
- Wiring harness: Limited 1-year
Note
- If Bluetooth connection is lost: The brake controller will continue to function safely, using the most recently programmed settings. This brake controller is not compatible, but will not interfere, with Apple CarPlay or Android Auto.
- Installation kit information: 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?
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.
51190 Curt Echo Wireless Trailer Brake Controller - Under Dash - Smart Phone Bluetooth Connection - One Control App for Brake Controller - 1 to 4 Axles - Proportional
51352 Curt Quick Plug Brake Control Adaptor Harness
Alternate Instructions
Video of Curt Echo Under-Dash Bluetooth Brake Controller w/ Custom Harness - Up to 4 Axles - Proportional
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Video Transcript for Curt Echo Brake Controllers Manufacturer Spotlight
Ratings & Reviews
4.6
224 reviews
by:
Casey
07/19/2026
2005
Chevrolet
Silverado
Fit my 2005 2500 4x4 6.0 Chevy Silverado and triflex next controller and worked perfectly.
by:
Adam
09/13/2026
2003
Chevrolet
Silverado
Vehicle specific, took 1 minute to install
by:
Freddie
08/08/2026
Pluged in perfect, absolutely recommend
by:
Harold
03/25/2026
Associate was very helpful email several options and price that l could choose Received order in timely manner was easy to install less than 10 minutes Will definitely use these guys again for towing needs
by:
Pete D.
07/28/2016
The Curt electric brake controller was the easiest installation I have ever had. I ordered the custom wiring adapter along with the brake controller; it all came with easy to follow instructions and it only took about 30 minutes to install the entire unit. I had done some checking around to get estimates from various companies which do the installations and their costs were around $300.00. The Curt unit including the adapter wiring was $**.00 and a very easy install. I used the brake controller during a recent camping trip on which I was pulling a 24 foot camp trailer. The controller worked great and I could easily control the trailer in some extreme mountainous terrains in Wyoming.
by:
Alan
03/12/2024
2023
Honda
Pilot
Do not buy either the Curt Under-Dash or plug-in Wireless brake controllers until Lippert fixes the phone app. I’ve used both happily with the old ECHO Smart Control app. I could use the remote manual button with the phone app not even running. As one would reasonably expect the button talked to the controller directly via Bluetooth. The new OneControl Auto app must be running and in the foreground to use the manual remote! And the most recent version of ECHO Smart Control is non-functional, it just tells you to install OneControl Auto.
Jenny N.
3/18/2024
I reached out to Curt about the problems with the new app. They advised that the new app runs the same as the old app it has to run in the foreground unless they are using the button which is the same as the old app. They wanted to know if you were having trouble getting past that screen. Which type of cell phone do you have and which IOS are you using?
by:
Matthew
11/25/2023
The break controller worked seamlessly. Profiles are easy to set up and it has very reliable Bluetooth connectivity with my phone. Installation was really easy on my Honda Pilot!
Matthew
11/25/2024
Still 5 stars, lots of trips including a long tow of over 5000 miles. Consistently worked flawlessly. Mild annoyance that they changed the app but once I learned how the new app worked it continues to function flawlessly.
by:
James
12/19/2023
Jeep
Grand Cherokee
This was relatively easy to install under the dash of our 2021 Jeep Grand Cherokee, especially since ours has the factory Trailer Tow Package and therefore an existing pigtail connector ready to connect to the brake controller. The Curt wiring adapter made it super easy to connect the Brake Controller to the vehicle's wiring harness. The controller was easy to calibrate and worked seamlessly while we're towing a rented trailer. We used a dedicated (older) cell phone to operate it while we're towing to avoid any potential interference from other apps rather than using our regular phone on which we receive phone calls texts, etc. This was our first time towing a trailer and this easy-to-use Brake Controller helped make us feel safe and comfortable. Highly recommended.
by:
David
03/03/2022
2003
GMC
Yukon XL
The adapter is as advertised, although I have an older brake controller that I had to do a small amount of wire splicing.
David
3/4/2023
Just fine.
by:
Mark W.
05/29/2017
Bought this trailer controller cable with a Curt Trailer Brake Controller. I dont know if it works or not. I installed this along with thr trailer brake controller at the same time. Nothing works. No lights power up on the controller. I highly respect Curt Products as I have many installed on my truck, but I'm disappointed with this combo purchase.
by:
Michael
04/05/2023
Easiest install ever !
Plug and play. App is easy understand and use.
My favorite is with the app and on selected active profile you can see the amount of brake amount is being applied to the trailer when the vehicle brakes are applied. I also install the manual override button. FYI: you don’t need the app on your phone open for the controller or the manual override button to work. Also another nice feature of the manual override button is the size about the size of a quarter, uses a CR2032 battery and the battery level is displayed in the app.
Plug and play. App is easy understand and use.
My favorite is with the app and on selected active profile you can see the amount of brake amount is being applied to the trailer when the vehicle brakes are applied. I also install the manual override button. FYI: you don’t need the app on your phone open for the controller or the manual override button to work. Also another nice feature of the manual override button is the size about the size of a quarter, uses a CR2032 battery and the battery level is displayed in the app.
by:
Paul
08/29/2022
I was looking for a trailer brake controller that did not require a permanent mounting to the dash or center console of my 2020 Jeep Grand Cherokee Trailhawk. I initially considered the wireless bluetooth controller from Curt Echo that plugs directly into the 7-pin outlet next to the tow hitch. However, reviews from individuals that tow RV trailers identified that particular option prevents the 12v battery on the trailer from charging off of the TV while connected. This would limit the RV utilization during long trips involving boondocking.
The Curt Echo under-dash controller seems to solve that problem and uses the same user interface as the Curt Echo.
Easy to install and operate; problem solved!
The Curt Echo under-dash controller seems to solve that problem and uses the same user interface as the Curt Echo.
Easy to install and operate; problem solved!
by:
Bill B
06/09/2014
Plug and play for GM trucks, very easy to hook up to the brake controler. Watch the instalation videos to see what terminal it plugs into on the vehicle.
Bill B.
6/9/2015
Im still using the above items and have had no problems with them. Thanks.
by:
Jim S.
04/21/2014
Given the fact that I only planned to tow my travel trailer one way up to the lake, I wanted an inexpensive brake controller. I looked online and in stores, and they were all over $100. When you added in the wiring. The controller I purchased from E-trailer only cost $49.99 including the wiring. I simply plugged it in, and after a short test tow, it works great. Took about 15 minutes to install. I'm very satisfied with my Curt brake controller. Got it in 3 days after ordering. Arrived fast, installed fast, and works great at a great price. What more can you ask? I'll be ordering from E-trailer in the future. Thank you.
by:
none
11/16/2014
Great price and prompt order processing. Controller mounting kit and harness made for a very easy install; about 20 minutes. Unit worked without any problems on a recent 300 mile trip with a horse trailer. Went over some fairly steep inclines in the Blue Ridge area of Virginia. Chose Curt Tri-flex controller over the more expensive brands because two of the three trailer dealers in the area carried those units as their default controller. The unit has all the braking functions without the fancy screens and interfaces. Found that I rarely looked at the controller display and the discrete black box worked for me.
by:
Micheal
08/05/2020
Made brake controller install ridiculously easy. Thanks Etrailer.com
Micheal M.
8/6/2021
Made the installation of brake controller super easy. Absolutely worth it. I wouldnt do it any other way after using this.
by:
Chris
08/20/2022
Honda
Ridgeline
I really wanted a trailer brake controller that I didn’t have to stick an ugly knob/box hanging off my dash. This was my solution and it works perfectly. Plugged right into my Honda Ridgeline existing plug, and easily connected to the app on my phone. Nice setup.
by:
Patrick
03/28/2022
As first time truck and pop-up trailer users, we initially purchased a cheaper brake controller that required drilling the dash. This is a new truck, so we decided to switch and spend more for the Bluetooth. etrailer was easy to work with for a return, and the Bluetooth brake controller is fantastic - so easy to use with our new trailer!
by:
Don Douglass
11/14/2016
Second time I have ordered parts for towing my trailer. Product was a snap well 2 snaps to install and works perfectly. Allows me to move my brake controller between both my vehicles. Used customer service this time as well and was extremely satisfied. Staff was knowledgeable, kind, and friendly.
by:
Earl
08/21/2023
2014
Ford
F-150
Needed a brake controller I could rely on because I was pulling my camper to a site at the top of a 25% grade within a few days. Unit plugged right into the harness for the factory brake controller (with the adapter cable) on my 2014 Ford F-150,and worked perfectly. Bluetooth connectivity works through the app (rather than through the phone's "settings" icon),and connects instantly. I'm very pleased with this product.
by:
Scott
09/18/2022
This brake controller has to be unplugged when not in use or it drains the battery in a few days. I had to have a electrical test done in my vehicle ($XXX). The etrailer tech said the test was done incorrectly. The Chevy dealer claims it was accurate. I’m left with a problem.
by:
Chris
10/03/2022
Was not aware this device draws on the battery constantly. I don't daily drive my truck and have had to replace the battery twice in one month due to being drained below the point where they could be recharged. $[XX] later and this controller removed, I've not had any problems with the battery
by:
Perry
11/28/2017
First, let me say that I have never been disappointed with any of my transactions with etrailer. This holds true with my latest purchase of a Curtis brake controller and pigtail. This is my second because the first was fried when the trailer wiring shorted out. I received the controller in 3 days, which included a partial weekend. The pigtail make installation so simple. I literally had the old controller out and the new one in within 5 minutes. I will look at etrailer first for any of my trailering needs.
by:
Steven
06/10/2020
-Plug in and go--- Quick and easy installation. Works great. etrailer was great to deal with. I had a missing part in one of the boxes, due to careless shipping, and I E-mailed about the part and etrailer sent a new part right away. Thanks for great service.
by:
Cliff W.
10/16/2014
2004
Chevrolet
Silverado
Great way to get an electric brake controller wired into your vehicle. GM was real smart to put a plug receptacle in the electric box for the electric brakes for trailers. etrailer shipped my order right away and all the items ordered were in great shape. Will be buying from them again.
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224
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view full answer... - Trailer Brakes Will Not Work and 2006 Chevy Silverado Lights Malfunction w/Curt Brake ControllerIt sounds like the red wire in the wiring harness # C51352 was not in the correct place. Take a look at the picture I have included and make sure that the wires in your harness are in the same places. This is the end that plugs into the truck. It needs to plug in at the junction box under the dash, to the left. It will plug into the spot that is on the top row, second from the left. The wire functions are white for ground, black for 12 volt power, blue for output to trailer brakes, and...
view full answer...
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view full answer... - Location to Install Brake Controller Power Fuse on 2003 GMC SierraI am assuming you are speaking of the fuse that activates the power feed to the brake controller. The 30 amp fuse is installed in the power distribution box as shown in the photo I have edited. The power distribution box is located under the hood, on the drivers side on the fender well. I have linked you to an FAQ article that describes how to install a brake controller on a 2003 GMC Sierra.
view full answer...
- Curt Brake Controller Wiring Adapter for a 2006 GMC Sierra We do have a plug-in adapter for your 2006 GMC Sierra, but the Curt # C51451 that you referenced is a fit for Chevy Silverado and GMC Sierra pickups starting in 2014. For your 2006 Sierra you want the Curt # C51352 instead. This adapter will plug into the junction box beneath your vehicle's dash as is demonstrated in the attached photos.
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- How to Install a Curt Brake Controller in a 2006 Chevy Silverado 1500You have installed correctly all of the components you referenced. The # C51110, # C51352, and the # HM40975. The issue you are experiencing is that the tow package wiring under the hood of your truck hasn't been completed like you suspected. The blue wire will need to get run to the brake output circuit of the 7-way you installed. Since this circuit isn't connected to anything that means the 7-wires that are at the rear of your vehicle aren't all ran. You will need to run a length of...
view full answer... - Brake Controller Does Not Work After Installation on a 2005 Chevy SilveradoOn certain year Chevy trucks there are additional connections that need to be made under the hood to make everything fully functional. I have included a link to an FAQ article to help you. Make sure that you are plugging in the harness into the spot on the top row, second from the left. The Curt harness you should be using is # C51352. With the brake controller plugged into the right spot and all the under hood connections made and fuses in place the brake controller should work just fine.
view full answer... - Troubleshooting Curt Brake Control Harness # C51352 Installation in 2007 Chevrolet Silverado ClassicThe Curt Brake Control Harness you reference, part # C51352, is compatible with both time-delayed and proportional brake controllers from Curt and is intended for vehicles with factory tow package wiring. As you noted, the connection port for the vehicle-side connector is under the dash in the electric junction box. The box interior is shown in the photo provided; the correct connection port for the harness (the second one from left on the top row) is highlighted in red. There are one...
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- Parts Needed and Method to Install Curt Trailer Brake Controller on 2007 Chevy SilveradoYou may or may not need an additional wiring harness to install the # C84VV. If your 2007 Chevy Silverado is the new body style you will not necessarily need the harness, but if it is a Classic you will need harness # C51352 because there is a port under the dash on the floor, on the far left. One end plugs into the controller, the other end plugs into the port. The port is located in a junction box. There is a black cover on the box. Remove the cover and plug in the harness in the top...
view full answer... - Curt Brake Controller Not Working Correctly After Moving It From 2006 Silverado to 2001 ModelIf you are using the same wiring adapter in the 2001 as you had in the 2006 Silverado, it would explain the problem you're having. Both model years use the same plug, but after the 2002 model year, GM changed the pinout on the connector under the dash. The 2006 Silverado uses the # C51352 wiring adapter, while the 2001 model would use the # C51342. I've edited a photo for you showing the difference between the two connectors, you can move the red wire to the correct location by removing...
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- How to Install Redarc Tow Pro Brake Controller for 99 and 05 SuburbanHey Richard, what you would want is the Redarc Tow Pro Liberty with universal install harness part # RED52VR for the 1999 Chevy Suburban. Then to allow you to install it in your 2005 Suburban you would want the Curt harness part # C51352 and the Redarc # RED69FR harness. The Curt harness fits the 2005 but it does not fit the Redarc so you would need to splice the two connectors together. What are you towing?
view full answer... - Parts Needed to Install a Trailer Brake Controller on a 1997 Chevrolet C/K Series PickupA brake controller wiring harness is not available for the 1997 Chevy K 1500 pickup. You will need to hardwire in a brake controller using 3 parts: a brake controller, a 4 and 7 way installation kit, and a 4-Way trailer wiring harness. If your truck already has a 4-Way trailer connector then you will not need to add one. But if it does not have any trailer wiring you will need to first install # 118315. I have linked installation instructions for you. Next you will need a 4 and 7 way...
view full answer... - Brake Controller Recommendation for a 2005 Chevy Tahoe with Factory Trailer ConnectorThe Curt Echo Under-Dash Brake Controller # C27JR is an excellent choice for your 2005 Chevy Tahoe. I really like it because you mount it under your dash and then you have a clutter-free brake controller to use! The correct wiring kit to connect this to the tow package on your Tahoe is the Curt Adapter # C51352. This gives you a simple plug-and-play installation that takes any guesswork out of the wiring. We have a variety of other controllers to choose from but the Echo Under-Dash is...
view full answer... - Install Harness for 2005 Chevy Tahoe for Curt Spectrum Brake ControllerYes the correct brake controller install harness for your 2005 Chevy Tahoe is the part # C51352 to install the Curt Spectrum # C51170 that you mentioned.
view full answer... - Is the Curt Custom Wiring Adapter # C51352 the Same Part as the Curt 51352?We have the part! The harness you need is the Curt Custom Wiring Adapter for Trailer Brake Controllers - Dual Plug In # C51352. This is the exact same as the Curt part number 51352. I went ahead and attached a demo video of the harness for your convenience.
view full answer... - Wiring Adapter Needed for Curt Reflex Trailer Brake Controller # C51130 on 2005 Chevrolet SilveradoThe wiring adapter needed to install the Curt Reflex trailer brake controller on your 2005 Chevrolet Z-71 Silverado is part # C51352. No cutting or splicing is required. Just plug the one end into the brake controller and the other end into the junction box under the dash. I have attached the installation instructions for you.
view full answer... - Troubleshooting Brake Controller Installation On 2003 GMC 3500When checking the brake output circuit of a 7-Way there should not be 12 volts of power all the time. A Curt brake controller will have what is termed 'dead' voltage at idle. This means there is voltage but no amperage draw. You can test for amperage instead of voltage to see if that is the case. If so, then you do not have a problem. If you are showing amperage draw that would indicate a short somewhere or possibly a problem with the brake controller. For a Curt brake controller, and if...
view full answer... - Troubleshooting Curt Tri-Flex # C51140 Brake Controller Installation in 2006 Chevrolet SilveradoThank you for your recent purchases from etrailer.com. The quick-connect brake controller adapter harness you purchased along with your brake controller, part # C51352, is the correct one for your 2006 Silverado. Brake controller installation in your truck, if it did not have a factory tow package, requires you to complete some electrical connections and install fuses in the engine compartment, at the power distribution box. Since you also ordered a 7-way, I will presume your truck did...
view full answer... - No power to New Trailer Brake Controller Install on a 2007 GMC Sierra ClassicYou will likely have to make at least one connection under the hood of your 2007 GMC Sierra Classic to power the brake controller. You may also need a fuse. I have included a link to the right that shows the connections that you will need to make under the hood to make everything fully functional.
view full answer... - Curt Trailer Brake Controller Does Not Power On when Installed on a 2007 GMC Sierra ClassicThere may actually be some additional connections that you will need to make under the hood. Take a look at the article I have linked that covers everything that you will need to do under the hood on your 2007 GMC Sierra Classic. First make sure you are plugged into the spot in the junction box in the top row, second from the left. Then make sure you have all the connections and fuses in the correct locations. It seems strange but also make sure the fuse you are using is a good fuse and...
view full answer... - Recommended Wiring Harness For A Curt TriFlex Trailer Brake Controller In A 2003 Chevy SilveradoThe part #15085418 you referenced comes back as an OEM GM wiring harness, which you would have to go to a GM dealership to purchase. If you're just needing a wiring harness for the Curt TriFlex Trailer Brake Controller - 1 to 4 Axles - Proportional # C24VV that you linked to so you can plug it into your 2003 Chevy Silverado with factory tow package then you can use the Curt Custom Wiring Adapter for Trailer Brake Controllers - Dual Plug In # C51352. This wiring harness will plug into...
view full answer... - Curt TriFlex Brake Controller C24VV Does Not Show Red Dot on Display After InstallationThe Curt TriFlex Trailer Brake Controller, part # C24VV, and the matching harness for your 2007 Chevrolet Silverado Classic, part # C51352, will work with your vehicle as long as your 7-way connector on your rear bumper is not the type that includes LED test lights. Such 7-way connectors are not compatible with the Curt TriFlex. It is critical that before installing the controller the negative battery terminal be disconnected to avoid potential damage to the unit. Also, the trailer must...
view full answer... - Parts Needed To Install Curt Assure Trailer Brake Controller In 2007 Chevy Silverado 2500HD ClassicI have another option for you, but your 2007 Chevrolet Silverado 2500HD Classic has a factory trailer brake controller port so there is no need to cut any wires. To replace your current controller with the Curt Assure Trailer Brake Controller with Dynamic Screen - 1 to 4 Axles - Proportional # C49UR you will just need the # C51352 which will plug into the factory trailer brake controller port underneath the dash of your truck. I included video reviews for both of the products mentioned...
view full answer... - Can Curt TriFlex Trailer Brake Controller # C24VV Be Temporarily Disabled When Backing UpI did some research on this controller for your 2006 Chevrolet Silverado, and there are no features available that will turn the Curt TriFlex Brake Controller, part # C24VV off. The best way to temporarily disable the controller when you intend to back up is to unplug the trailer. If you were to unplug the controller, it would have to be reset when it is plugged back in. I spoke with my contact at Curt and they strongly advised against doing this because if someone failed to reconnect the...
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Do you have a question about this Trailer Brake Controller?
Info for this part was:
Edited by:
Lindsey S
Updated by:
Wilson B
Updated by:
Alex H
Updated by:
Amanda K
Written by:
Sabrina W
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Pete D.
7/28/2017
Still works great after a year no problems at all.