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Curt Universal Installation Kit for Trailer Brake Controller - 7-Way RV - 10 Gauge

Curt Universal Installation Kit for Trailer Brake Controller - 7-Way RV - 10 Gauge

Part Number: C57186
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This universal wiring kit lets you install an electric brake controller (sold separately) in your vehicle and a 7-way connector for your trailer lights at the same time. Plugs into the existing 4-way on your vehicle. Great Prices for the best trailer wiring from CURT. Curt Universal Installation Kit for Trailer Brake Controller - 7-Way RV - 10 Gauge part number C57186 can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (58)
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CURT Trailer Wiring - C57186

  • Wiring Adapters
  • Single-Function Adapter
  • 7 Round - Blade
  • Plug and Lead
  • 4 Flat
  • CURT

This universal wiring kit lets you install an electric brake controller (sold separately) in your vehicle and a 7-way connector for your trailer lights at the same time. Plugs into the existing 4-way on your vehicle.


  • Universal kit includes wiring and hardware required for installation of a trailer brake controller (sold separately)
    • Designed for use on a vehicle with an existing 4-way flat trailer connector
  • 20' Long duplex cable houses (2) 10-gauge wires
    • Connect 1 wire to the blue wire on the brake controller
    • Connect 1 wire to the positive post on the vehicle's battery via the included 40-amp circuit breaker
  • Pre-wired 7-way trailer connector mounts easily at rear of vehicle with mounting bracket (sold separately)
    • Plugs into existing 4-way trailer connector on vehicle
  • 30-Amp and 40-amp circuit breakers protect your vehicle's electrical system by preventing overload
  • Quick-splice wiring connector lets you easily connect your brake controller's stop signal wire to your brake pedal switch
  • Heavy-duty replacement flasher prevents your turn signals from blinking too fast
  • Ring terminals attach to wires so you can connect leads to circuit breakers and battery posts
    • (5) #10 Ring terminals
    • (2) 3/8" Ring terminals
  • 4 Butt connectors for joining wires
  • (8) 8-1/2" Long cable ties let you secure loose wires
  • Limited 1-year warranty


  • No existing 4-pole connector: If your vehicle does not already have a 4-pole flat trailer connector installed, the application guide can be used to find the easy-to-install connector made specifically for your vehicle.
  • Extra-long vehicles: If you drive a crew cab, extended cab with long bed, cargo van, or extended-length SUV, extra wire (ETBCXW - sold separately) will make installation much easier.

Wiring Diagram for Trailer Brake Controller Installation

Wiring diagram of brake controller installation

57186 Curt Universal Installation Kit for Electric Trailer Brake Control - 7-Way Blade and 4-Pole Flat - 10 Gauge Wires

Installation Details C57186 Installation instructions

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Curt Universal Installation Kit for Trailer Brake Controller - 7-Way RV - 10 Gauge - C57186

Average Customer Rating:  4.8 out of 5 stars   (58 Customer Reviews)

This universal wiring kit lets you install an electric brake controller (sold separately) in your vehicle and a 7-way connector for your trailer lights at the same time. Plugs into the existing 4-way on your vehicle.


I ordered this wiring kit for a 2003 Dodge Ram 1500 I recently acquired. The Ram was not tow ready but did have a factory 4-way. I also ordered hitch #13333. The wiring kit is very high quality and was easy to install. The 7-way fit perfectly where the factory 7-way would have gone. I'm using a Tekonsha Prodigy RF wireless brake controller so the blue lead was not needed but I left some extra should that change. Thanks etrailer!


Arrived on time and installing now



Excellent!! I lovbe it


I was skeptical about this purchase at first, but when I thought of all the parts I was going to have to round up at our local auto parts store, whether they had them in stock, and if they had to order them, I decided to get this product from etrailer. I am very glad I did as I found out the existing 7-way plug on my truck had lots of rust/corrosion and the ground wire was almost rusted off its connection points. It is nice having all of the connections already in the 7-way plug and the product arrived in just 2 days with standard shipping! The directions that came with this product were very helpful! I won't hesitate to ordering from etrailer again. I also purchased C51140: Curt TriFlex Trailer Brake Controller to go with this. Works great!


Great product and very easy to understand the installation instructions. Very quick shipping. My 2013 Ford F-150 had no factory wiring and this is gonna give the 7-way I need





used on chevy express van works well, van was not prewired for trailer connections or brakes this was my only option, installation took awhile for connections under hood and dash, circuit breakers mounted under hood greased up w/ dielectric grease so far so good made it through 1 Michigan winter


This trailer brake wiring harness worked very well on my wife's 2013 Chevy Equinox, and the videos and instructions Etrailer provides for nearly everything they sell can't be beat. Have been using this since April 2020.


This product made life real easy converting a standard 4-way plug into a 7-way blade plug and adding a Tekonsha P3 trailer brake controller on my motorhome (1993 Monaco Dynasty). It solved several problems, now I do not have the buy (and have installed) a tow bar and pneumatic brake system for the pickup, just load it up on the car hauler and go (with brakes). Follow the instructions & wiring diagram (simple); the hardest part (not that difficult) of the job was running the controller wire to the front of the MH. Thanks George.


The 7 way trailer light system and brake controller- installed easily and worked well with our pop up trailer.


Used this and other items to install an RV connection with bake controller in a Subaru Forester that had a factory hitch and four way trailer connection.


It was not entirely clear about what to do with the blue wire in the instructions. The blue wire must connect to the controller for everything to work. Other than that, its a decent kit


etrailer videos make installation easy, took 2 hours and saved hundreds. Put the trailer brake controller on and now have my eyes on air suspension through etrailer.


The 7 way break connector I received was equipped with excellent instructions and all parts needed to hook up I had no problem installing and works excellent I would give 5 stars


Installed easily and have had no problems over the year I have used this wiring harness.


Delivered as it was suposed to.


nice with easy instructions to follow



Still working great


Easiest 4 Way to 7 Way plug conversion I have ever done!


I bought this connector for a 1995 F- Super Duty cab and chassis and it was an exact fit. Plug and play. Thanks etrailer!


Had everything I needed to install brake wiring on my 2011 Santa Fe


Quality product


Arrived ahead of promised date. Quality is good. Instructions were excellent. Very satisfied.


Good quality, good price and fast shipping keeps me coming back to


good instructions and easy to install


Was very good, but ground wire too short


Quality wireing and good instructions


Return customer; as always, etrailer went above and beyond with their great customer service!

Show More Reviews

See what our Experts say about this CURT Trailer Wiring

  • Installing Tekonsha Prodigy P3 In A 2022 Toyota Highlander XLE Without Factory Tow Package
    Hello Paula. To install a Tekonsha Prodigy P3 in your 2022 Toyota Highlander you will just need to install a 7-way harness. I recommend the Tekonsha OEM Replacement Vehicle Wiring Harness # TK57VR. This will come with everything you need to wire your vehicle with a 7-way, including all of the necessary wires for connecting your P3 brake controller.
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  • Parts List to Re-Wire a Trailer w/ Electric Brakes
    To completely rewire your 20' trailer from start to finish I recommend using the following parts: 7-Way Connector and Cable - Hopkins Molded Cable 8' Long item # H20046 Junction Box - Trailer Wiring Junction Box - 7 Color Coded Terminals item # 3375601101 10 Gauge Wiring for Brakes and 12v Power Sold by the Foot - 10 Gauge Primary Wire item # 10-1-1 16 Gauge Wiring for Lights Sold by the Foot - Bonded 4 Wire item # 16-4B-1 3/16 Inch Ring Terminals item # 44-5310A 1/4 Inch Ring Terminals...
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  • Installing A Reese Brakeman Controller In A 202 Ford E250 With Factory 4-Flat
    Hey John, I can definitely help with that. The Reese brakeman controllers are compatible with the Tekonsha brand plug-and-play adapters. For your 2002 Ford E250 you can use the # 3035-P to plug directly in to the factory brake controller plug. You will also need item # 37185 to complete your wiring. The brake (blue) wire will need to be run from the brake controller back to the plug in the rear. The brake controller power and brake pedal wires are already run. A 12 volt hot lead from the...
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  • Parts Needed For Adding A Brake Controller To a 2017 Subaru Outback Wagon
    While the Curt Universal Installation Kit for Trailer Brake Controller # C57186 will give you everything that you are needing, I prefer the etrailer Universal Installation Kit for Trailer Brake Controller # ETBC7 for your 2017 Subaru Outback. Our trailer connection will give you a provision that will allow you plug into a 7-way or 4-way flat trailer without unhooking any wiring or using a separate adapter. And our kit will include a mounting bracket for the 7-way so you wont need to purchase...
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  • Trailer Brake Controller for 2017 Jeep Wrangler Unlimited with Factory 4-Pole
    We can help you select a trailer brake controller and the 7-way wiring setup needed to enable towing your camper. A great place to start is the linked video in which one of our technical team reviews some of the more popular controller options including the well-proven Prodigy P3 # 90195. The P3 offers the advantages of a large clear display, brake power settings you can store and call up on demand and an outstanding record of reliability. The P3 will install using kit # ETBC7 as shown...
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  • Recommended Universal 7-Way Kit for 2010 Toyota RAV4
    You are exactly correct in that you can use either the Curt Installation Kit # C57186 or the Universal Installation Kit # ETBC7 to install a brake controller and fully functional 7-Way from the 4-Way you already have installed. These are both universal 7-Way kits that will work on your 2010 RAV4. Between the two kits, I actually recommend going with the # ETBC7. This is because unlike the Curt Kit, this will include a circuit tester to help with installation, along with a bracket to attach...
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  • Does Curt Universal Installation Kit # C57186 Include Wiring to Activate 12V Pin on 7-Way
    If your vehicle is equipped with a 4-Way connector, the Curt Universal Installation Kit # C57186 that you referenced includes everything needed to convert it to a fully-functional 7-Way. This includes the needed 10 gauge wire that you will connect to the vehicle's positive battery post via the included 40 amp breaker to activate the 12V pin on the 7-Way. This is the terminal you will use to charge the battery on your trailer while you are towing. I have attached the complete written installation...
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  • Is Red Wire Needed on Curt Brake Controller Installation Kit
    The red wire coming out of the 7-way on the Curt Universal Installation Kit for Trailer Brake Controller # C57186 is for the reverse light circuit. If you do not have this function or don't want to use it then no, you do not have to and can simply tie it off. I've added a link to the written instructions as well as a video review of this kit for you to check out.
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  • Should I Always Have Power On Blue Wire After Installing Curt TriFlex Trailer Brake Controller
    The only time you want to see power on the blue brake wire from the Curt Triflex Brake Controller part # C24VV is when the brake pedal depressed in the vehicle or the brake controller manual override is activated. If the blue wire has a constant 12V then it is an indication that there is an issue with the wiring. This could lead to your trailer brakes locking up, getting hot or not working at all once you hook your trailer up. I was able to find your account and it looks like you used...
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  • Troubleshooting Brake Controller Output on the Curt Universal Installation Kit # C57186
    It sounds like the brake controller output on the 7-Way of the Curt Universal Installation Kit # C57186 isn't functioning properly. This is probably the result of some damaged wiring but would start off by checking the brake controller pin and the pin for the 12V power (since those wires are run together) just to make sure. Using a circuit tester # PTW2979 test the pins in the 1 o'clock and 5 o'clock positions for functionality (see attached photo). The 12V power pin will have constant...
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  • Easiest to Install 7-Way and Brake Controller for a 2010 Toyota FJ Cruiser
    Yes, we have a 7-way trailer wiring harness for you that uses the existing 4-way trailer connector and we have a brake controller that does not require you to splice into the stop light switch circuit. For this, I recommend using the Curt Universal Installation Kit for Trailer Brake Controller part # C57186 along with the Curt Echo Mobile Trailer Brake Controller part # C51180. The Curt Universal Installation Kit will plug into the 4-way you have now as mentioned above and the only other...
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  • Does Curt Universal Brake Controller Install Kit # C57186 Come with Battery Charge Line Components
    Yes, the Curt Universal Installation Kit for Trailer Brake Controller # C57186 that you referenced does come with everything needed to run charge line for trailer battery charging. What this comes with that's related to that is 10 gauge wire plus a 40 amp circuit breaker needed to activate this circuit. I attached a review video link to this page for this kit for you to check out as well.
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  • Can Curt 57186 7-Way Adapter Work with Curt 51180 Echo Wireless Brake Controller
    Yes, you can use the Curt Universal Installation Kit for Trailer Brake Controller # C57186 instead of the # ETBC7L to install the Curt Echo Mobile brake controller part # C51180. You'd do exactly like what you mentioned. You'd wire up just the black wire to the vehicle battery with the included wire and 40 amp breaker and you'd be set.
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  • Wiring And Brake Controller Needed For A 2006 Chevy Express Van 1500
    Hey RJ, For the 4-pole wiring I recommend the Tekonsha T-One Vehicle Wiring Harness # 118392. This comes with plug-in connectors for a fast and easy installation. From there you'll want the # ETBC7 to get the 7-way. It will plug into the Tekonsha 4-pole connector and have a few more wires to run. I've attached videos for both of these harnesses to help walk you through the installation process. I do recommend picking up a no-drill bracket # 18136 to make mounting the 7-way on the trailer...
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  • Recommended Brake Control Setup For A 2022 Ram Promaster 3500
    When it comes to installing a brake controller in your 2022 Ram Promaster 3500 the first thing you will need is The Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires # ETBC7. This kit is designed for use on your vehicle with an existing 4-way trailer connector. It will plug directly into your 4 way and make it to where you could either run a 7 round plug or a 4 flat plug. There will be 4 additional wires that you will have to use to activate...
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  • Wiring Kit For Installing A Brake Controller On a 1997 Chevrolet C/K1500 Truck
    The Curt Universal Installation Kit # C57186 is universal and will work on your 1997 Chevrolet Silverado 1500. It does not have a mounting bracket for the 7-way and will require you to already have a 4-way Trailer Connection # C55315. I recommend using the Universal Installation Kit for Trailer Brake Controller # ETBC7. Our kit will include the mounting bracket for the 7-way and on the trailer connector there is a separate connector for 4-way trailers. This means that you will not need...
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  • Installing Curt 7-Way C57186 to 2007 Dodge Ram With Factory 4-Flat
    Since you mentioned you already have the plug under the dash but not a 7-way, I am going to assume your 2007 Dodge Ram has the factory 4-way. If that is the case, you just need to plug in the 4-way and connect the blue brake wire to the Curt Universal Installation Kit for Trailer Brake Controller # C57186. The blue brake wire is often located under the driver's side of the vehicle, right behind the front wheel well, and I have linked a help article below which details exactly what you...
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  • How to Add a 4 and 7-Way Trailer Connector to a 2011 Ford Ranger
    The best option I have for you to add a 4-way trailer connector to your 2011 Ford Ranger is with the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 56014. The reason that this is the best option is because it does not require any cutting/splicing, it will just plug in behind each of your taillights. If the trailer you will be towing with your Ranger has brakes then you will also need both a 7-way trailer connector and a brake controller. For a 7-way,...
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  • How Much Can a 2015 Subaru Forester Tow
    The towing capacity of your 2015 Subaru Forester is 1,000 lbs if the trailer doesn't have brakes and 1,500 lbs if it does have brakes according to the owner's manual. Therefore, as long as the camper you are looking at has brakes or you add them then yes you can safely tow the trailer with this vehicle. In order to tow a trailer with your Forester you will need a trailer hitch, wiring harness, and ball mount/hitch ball. For a trailer hitch I recommend the Curt Trailer Hitch Receiver...
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  • Parts Needed To Tow with a 2017 GMC Savana 2500 Van
    If the trailer you will be towing with your 2017 GMC Savana 2500 Van has brakes then yes, you will need to use a 7-way wiring harness and brake controller in addition to the trailer hitch, trailer wiring harness, and ball mount/hitch ball. These will be the only requirements to tow the trailer but you may also be interested in a transmission cooler to help prolong the life of your vehicle's transmission. For a trailer hitch, I recommend the Trailer Hitch Receiver part # E98861....
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  • Installation Videos for the Universal Installation Kit ETBC7
    I do have a couple videos of the Universal Installation Kit for Trailer Brake Controller item # ETBC7 being installed on a Hyundai Santa Fe but we haven't been able to get our hands on a 2022 model so they are a few years older. This being a universal installation kit there won't be any differences in the steps you will need to follow. You will need a 4-flat connector to use the Universal Installation Kit on your 2022 Santa Fe. If you don't already have one, I recommend the Curt T-Connector...
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  • Do Both 4-Way and 7-Way Hot Leads Need to Be Ran on a 2017 Toyota Sienna
    Yes, the 12 volt power wire on the Curt T-Connector Vehicle Wiring Harness part # C56106 which is a fit for your 2017 Toyota Sienna SE will still need to be ran to the positive side of the battery terminal when combined with a 7-way wiring harness like the Curt Universal Installation Kit for Trailer Brake Controller part # C57186. The reason for this is because the power wire on the 4-way harness is designed to help minimize the power draw on the vehicle's electrical circuits whereas the...
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  • What is the Towing Capacity of a 1999 Ford F-350 with V10 Engine
    The maximum conventional towing capacity of your 1999 Ford F-350 is 5,000 lbs at the bumper and 10,000 lbs at the trailer hitch. If you are looking to tow under 5,000 lbs then all you would need is a hitch ball like the 2" Hitch Ball part # 40038 or the 2-5/16" Hitch Ball part # C40007. However, if you looking to tow in excess of 5,000 lbs then you would need a frame mount trailer hitch like the Curt Trailer Hitch Receiver part # C15316 which is a custom fit that provides you with a 2"...
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  • Parts Needed to Convert 4-Way of 1986 Dodge W250 to 7-Way to Install Brake Controller
    To convert your 4-way to a 7-way so that you can install a brake controller all you need is the adapter part # ETBC7. This comes with everything needed to adapt to the 7-way and wire in the brake controller. The Curt Venturer # C74VV would work with this adapter and your truck as well.
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