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7-Way RV Upgrade Kit for Trailer Brake Controller Installation - 12 Gauge Wires

7-Way RV Upgrade Kit for Trailer Brake Controller Installation - 12 Gauge Wires

Item # ETBC7L
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If you have only a 4-way flat on your vehicle and want to install a brake controller that pulls power from a 7-way trailer connector instead of wiring directly into your vehicle, this kit will adapt your plug for use with your brake controller. 1-636-306-4830 to order etrailer accessories and parts part number ETBC7L or order online at Free expert support on all etrailer products. Great prices and Fastest Shipping for 7-Way RV Upgrade Kit for Trailer Brake Controller Installation - 12 Gauge Wires. Accessories and Parts reviews from real customers.
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etrailer Accessories and Parts - ETBC7L

  • Trailer Brake Controller
  • Installation Kit
  • etrailer

If you have only a 4-way flat on your vehicle and want to install a brake controller that pulls power from a 7-way trailer connector instead of wiring directly into your vehicle, this kit will adapt your plug for use with your brake controller.


  • Kit allows you to use a trailer brake controller that pulls power from your trailer connector instead of wiring into your vehicle
    • Great for use with Tekonsha Prodigy RF (90250), Autowbrake (3430001), and Curt Echo (C51180) trailer brake controllers
  • Pre-wired 7- and 4-way trailer connector mounts easily at rear of vehicle with included bracket
    • Plugs into existing 4-way trailer connector on vehicle
  • (20') 12-Gauge wire lets you run power from your vehicle's battery to the trailer connector
    • General Purpose Thermo-Plastic (GPT) insulation is highly resistant to acids, gasoline, oil, grease and most industrial solvents
  • Heavy-duty, 40-amp circuit breaker protects your vehicle's electrical system by preventing overload
  • Installation hardware included
    • Ring terminals for battery and breaker hookup
    • Self-tapping screws for attaching circuit breaker and ground
    • Zip-ties for securing loose wires

Note: If your vehicle does not already have a 4-pole flat trailer connector installed, the etrailer application guide can be used to find the easy-to-install connector made specifically for your vehicle.

57672 Connector Diagram

7-Way RV Upgrade Kit for Trailer Brake Controller Installation - 12 Gauge Wires

Customer Satisfaction Score:

Customer Reviews

7-Way RV Upgrade Kit for Trailer Brake Controller Installation - 12 Gauge Wires - ETBC7L

Average Customer Rating:  4.6 out of 5 stars   (205 Customer Reviews)

If you have only a 4-way flat on your vehicle and want to install a brake controller that pulls power from a 7-way trailer connector instead of wiring directly into your vehicle, this kit will adapt your plug for use with your brake controller.


This part was installed on a 2018 Subaru Outback. I did use a CURT 57204 bracket to help stiffen the mounting area since I'm using an Ecohitch Hidden Hitch. I also had to use a little more 12 gauge wire than was provided in the kit, as suggested in etrailer's installation video. Great product and very useful videos made this installation a breeze. Thanks etrailer!
PS - Use this product if you have already installed etrailer's 4-Pole Flat Trailer Connector in your Subaru.


I installed the ETBC7L 7 way adapter plug on my new 2022 Santa Cruz to be used with the Curt C51180 wireless brake controller. I was able to bend the 7way mounting bracket flange in vise from 90 degrees to about 45 degrees to match the Hyundai OEM hitch 7way mounting bracket. The wire to battery I encased all the way with protective flexible cover. I mounted the circuit breaker under hood by battery and capped breaker terminals with rubber cover that was cut off 4way plug, it worked perfectly. This is one neat little pickup with its 5000 lb tow rating with a brake controller. It was a fairly easy installation and the best way I think without cutting into vehicles wiring for a brake controller. I have enclosed some pics.


This fit ALMOST perfectly on my 2007 Tacoma. I zip tied the four pin trailer connection to the tow vehicle harness. Besides the four pin, I only needed the black power wire because I am using a Curt Echo bluetooth brake controller. I ran the power wire along the frame, into the cab, through the firewall and to the battery via the included breaker. I zip tied the unused wires to the harness and wrapped the whole thing in electrical tape. The included bracket almost fit my OEM four pin mount perfectly. The holes were a bit too narrow but I just had to widen them with a drill bit pressing outward. The setup looks stock and I'm very pleased with it.

Like many other on here, my screws have rusted. I would gladly pay the extra $2 for stainless ones to come in the kit. Otherwise everything is still working good.
Thomas R - 04/13/2021


I used this kit to convert an OEM 4-way flat connector to a 7-way on a 2012 Toyota FJ Cruiser. Easy, straightforward install. Only issue I ran into was that I had to elongate the kit mounting bracket holes to use the existing bracket holes. etrailer provides excellent written and video installation instructions.


This it it! Perfect kit for my BMW X5 without a tow package. Pair this with a wireless proportional brake controller and you’re set!


Great installation kit. Easy to use, especially with the videos on e-trailer. Kudos to e-trailer!


Everything delivered as ordered with easy installation instructions, and working perfectly. The etrailer website was very helpful in selecting what hardware was needed. A bit disappointed the Curt wireless controller doesn’t seat more securely in the 7- way, but the provided safety strap should keep it in place. Would definitely recommend etrailer and will use it again.


Had to modify for my 2017 Wrangler JKU.
Muffler is too close to bumper frame, so had to mount the bracket to the edge so wires would clear heat of muffler.
Bumper bottom is not flush with frame. Could not open 7-pin connector cover all the way, had to mount it sideways. So I had to drill new holes in mounting bracket.
There is not enough wire to properly route. Had to add 4 feet.


Pros; pretty much everything you'll need for the upgrade is provided except the electrical tape. Lol. If you are going to be using a bluetooth brake controller and no reverse lights on the trailer, after plugging into your vehicles existing 4 pin you'll need to attach the ground wire and run the hot wire to the breaker and then to the vehicle's battery. Pretty simple. Cons; very poorly designed mounting bracket feature for 4 pin (this is an understatement). I was able to overcome that by mounting the OEM supplied 4 pin bracket onto the one that comes with this kit.


Used on 2015 Wrangler JKUL. Based on recommendation from Erik (etrailer) the product was received. Installed without any issues. Only note is this kit has single black wire for 12v not the 12v/brake cable. So make certain you do not need to attach to the brake circuit.


Purchased this for our 2016 Kia Sorento So we could tow a pop-up camper. Had to purchase the Tekonsha 4-way kit for factory tow package first, then added this ETBC7L to convert it from 4-way to 7-way electrical. Most challenging part was running the wire up to the battery. I did not like the bracket that came with it so bought a draw-tite bracket that looked cleaner. **The 30amp circuit breaker was missing from the ETBC7L kit that I purchased. It was inconvenient that it was missing but customer service and getting the replacement was easy and expedient.** THIS IS NOT A MANUFACTURED KIT FROM TEKONSHA...ETRAILER BUILDS THIS AS A KIT WITH ALL THE PARTS NEEDED TO SET UP**


Very easy to install, came complete with all needed to connect lights from tow vehicle to trailer plug.


I installed the 7-way wiring kit myself. The Instructions were difficult to understand, but I found a [online} video that was very helpful. My biggest complaint is the 4 screws that hold the wiring kit to the mounting bracket all rusted out, which now look terrible one year later. Other than that, I’m happy with the wiring unit itself.

I recommend replacing the screws or cleaning the screws and using a rust resistant spray like Rustoleum with them.
-- Etrailer Expert Jenny N - 01/11/2022


The kit itself is very nice. I wired it on a Rav4 Prime SE. The 4-pin does not really secure very well to the mounting bracket, there is just a slot and rubber ribs that slide in. Mine has not fallen out yet, but it just seems kind of insecure. I would have preferred it be permanently mounted and I did not notice it before I ordered. Also, the four mounting screws that secure the connector to the mounting plate are coated with black oxide that will rust within a week or two. I plan to replace the mounting screws with ones that are coated with a more automotive grade coating.


Easy to do, comes with everything you need, except the long wire wasn't quite long enough, so I bought another piece of wire, AND the bolts that hold the socket together were not stainless, I have rust stains coming from them, would like to get them replaced this year with some stainless bolts. Was easy to install, I was quite worried it was going to be too complex, but it was simple. Save over $100 doing it myself, plus knowing done right.


Great product and looks sleek. I installed on my 2020 Subaru Outback Touring XT and attached to my factory installed hitch. With a vice and hammer, I had to bend the supplied bracket straight for the correct mount orientation; it turned out great though! I gave 4 ??'s because of several factors: 1) After taking a bit of time routing the 12 awg wire to the battery, I could have used a foot or two more wire; my car isn't even that long, and I took a pretty direct route. I even measured and preplanned, thinking I'd be fine. Had to use some spare 12 awg wire I had on hand. 2) As another reviewer stated, I was having problems with the 4-pin sliding out of the bracket. But, I fixed the problem by tying one of the supplied zip-ties around the rubber 4-pin edge and two of the bracket screws, which now holds it in place. 3) It would have been nice to have a set of screws and nuts to attach the bracket to the hitch; I just utilized the existing ones from my 4-pin factory installed bracket.
All in all, I'm really happy with this product!


The videos and help were invaluable in connecting all of the wires for the power and brake control. The video was even on the exact model that I was putting the connector on.

There are three difficult procedures in the installation.
1) Getting a connection to the brake light under the dash is very difficult as there is very little room. I would have liked to see how the tech was able to determine which wire was the correct one to use and extend it in order to make a splice. I removed the brake switch from the bracket which allowed me to pull it down enough to test each wire and find the one that went live with the brake pedal being used.
2) Making a hole in the firewall to pass power, ground and the brake control wire. Here the video was spot on. The difficulty is that the firewall is about 12" behind the ducting on the engine side and there is not much room inside to work. I used a 24" 1/4 drill from the engine side to start a hole in a good place. Using a drill from the inside the hole was than enlarged to what was needed.
3) Routing the wire from the engine to the back. Here the video did not go into detail as to how the fish the wire through and over the various components. Having a high lift would definitely help here.

The remaining connection and wiring was straight forward. I used expandable braided shielding on all of the wires to bundle them together and add additional abrasion resistance.

As an added safety measure, inexpensive rubber boots were used to cover the exposed connections on the breakers. Without the boot, the studs would be exposed even with the engine covers in place.


This part was exactly what I was looking for. I knew it would not fit my volvo XC90 perfectly, so Iwanted something that I could cut/bend to make it fit the way I wanted. This part was a great starting point and yielded a very robust mount that is tucked up out of the way.


Today I installed:
- Draw-Tite Max-Frame
Trailer Hitch Receiver (Item #76156)
- Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector (Item #C56217)
- 7-Way RV Upgrade Kit for Trailer Brake Controller Installation - 12 Gauge Wires (Item #ETBC7L)

It took about 4 hrs at an amateur pace with manual tools.

This is the second time I put a trailer hitch receiver on a Toyota Highlander. My first installation was a Curt on a 2010 Highlander. This time I got the Draw-Tite for my 2018 Highlander.

Few observations:
- The fact that the car comes pre-wired and with welded nuts for the hitch makes the installation smooth and easy. Nicely done by Toyota.
- The Draw-Tite hitch receiver is NOT designed for use with weight distributing hitch, which may be an issue for some users.
- I like the that the hitch is nicely hidden under the rear bumper and comes with the bracket for trailer electric connector. Keeps things nice and tidy.
- The installation can be done by one person (with the aid of a couple of plastic buckets), but I STRONGLY recommend to have a helper. The hitch receiver is heavy and if you drop it can cause some serious damage to your body.
- There is no need to remove the passenger side plastic mud cover behind the rear wheel.
- There is a good reason why they don't show you the cutting and installation of the driver side mud cover in the etrailer videos. It's the proverbial PITA. :-)
- The receiver ends-up about 16" from the ground (with the car unloaded), so you will need a 2-3" rise ball mount to end around 17-18" once the trailer is hooked up.
- The cables can be routed nicely through an existing hole under the driver side plastic storage bin. It comes with a rubber plug which can be cut just enough to lush the connector through. This is the cable routing for OEM Toyota trailer cables. And because is it hidden under the plastic mud cover, you don't have to worry water getting in when driving on a rainy day.
- Make sure to protect the cables with a plastic hose or by wrapping them with plenty of insulating tape to prevent chaffing in the places where the cables cross hitch members. Some edges can be sharp and sooner or later will cut through the insulation.
- Trailer wiring and the T-connector are power all the time, regardless of if the key is in the ignition or not. So make sure to unplug your trailer when parked for extended period of time to prevent running down the battery. The T-connector itself draws only about 1 mA when idle, so you don't have to worry as long as the trailer is not connected.
- The fact that you can see the hitch with the rear view camera makes hooking up the trailer a breeze by just person.

Overall, I'm happy with the product.

And etrailer customer services and prompt shipping was, as always, 5-stars. (I am a returning customer)


Wire kit came with everything needed to install on my 2020 Subaru Outback. Took some time to make sure the 12v power was ran safely from the battery to the plug but easy to find a good path. I threw away the bracket that came with the kit as my curt hidden receiver didn’t have a mounting place. I used the curt easy wording bracket that goes over the collar of the hitch and supports the 4 way and 7 pin adapter. I also used the curt plug and play wire adapter for the 4 pin harness and cut a hole in the drain plug for it to run out the spare tire area and into the wire harness.


Worked very well! My only issue is that I had no brake lights or taillights at first. It took me a while to figure out there was a blown fuse on the 4 way connector wiring (2012 Honda Pilot 4 way wiring kit previously DIY installed a few years ago). After fixing that it works perfectly.


I installed this so I could use the Bluetooth trailer brake control. It took about 3-4 hours. works great like it supposed to. easy instructions.


used it to get 7-way plug for my Subaru Outback to tow a Aliner. Use it with curt echo wireless and works well for me.


It works. Hardware could be better, already rusting after a year.


Dealer installation using etrailer kit on 2021 Hyundai Palisade. The hitch sits low @ 13”. I’ll be using a Curt Echo and am excited to tow popups and ultralights.

Show More Reviews

See what our Experts say about this etrailer Accessories and Parts

  • Can Power for Curt C51180 Echo Brake Controller Be Obtained from Trailer Mounted Battery
    For the most reliable and safe connection possible, Curt recommends obtaining the power for the controller directly from the vehicle battery and running the circuit through a 40 amp breaker like what's provided with the # ETBC7L. This way, you can both power the controller and provide a maintenance charge for the trailer mounted battery. You're certainly welcome to install it however you wish but for liability reasons, I couldn't recommend installing it in any other manner than what the...
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  • Converting 4-Way Trailer Connector to 7-Way on 2018 Toyota Highlander
    Since you already have a 4-way connector on your 2018 Toyota Highlander you need to use one of our adapter kits to convert it to a 7-way. If the trailer doesn't have brakes you only need to power its lights and the battery so you can use part # ETBC7L which includes the adapter and the wiring and circuit breaker to make the 12 volt pin active. This way you'll be able to provide a maintenance charge to your battery as well as power the trailer's lights. On the other hand if the trailer...
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  • Wiring a 2021 Subaru Outback to Use a Wireless Brake Controller
    To get both of the 2021 Subaru Outbacks pulling the Safari Condo F1743, you would need to purchase two of the # ETBC7L kits. They would piggy back off of the existing 4 pin connections already on the vehicles, so you are already partially there. The # ETBC7L would allow you to utilize the Tekonsha Prodigy RF controller, or add on a hardwire kit at a later date if needed. There have been a few connectivity issues, but generally with larger vehicles and or motorhomes. One of the big pluses...
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    In order to allow a 2015 Ford Explorer to be able to tow a trailer with brakes you will need to install a 4 to 7-way adapter. For this, the Universal Brake Controller Install Kit part # ETBC7L is what I recommend. This kit is almost completely plug-n-play, you will have to plug the two 4-way ends in together, ground the white wire, and then you will have to run a power wire up to the battery with a circuit breaker in-between but that is all. The kit will work just fine with your wireless...
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  • What to do with Blue Wire with Install Harness # ETBC7L with Curt Echo Mobile C51180
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    We do have what you are needing, with a 7-way kit that does not have brake wire since you aren't going to be using electric trailer brakes, and only want the 12 volt power. What you can use is the following kit: - 7-Way RV Upgrade Kit # ETBC7L Though the # ETBC7L is technically for brake controllers it does not have the brake wire, it comes with the 7-way, 12-gauge wire, mounting bracket and 40-amp circuit breaker (which would be used instead of a fuse).
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  • Can 12 Volt Power Source for Brake Controller Install Kit # ETBC7L Run to Alternative Circuit
    The reason you want to run the power wire of the # ETBC7L up to the vehicle battery is because this is the circuit that the brake controller draws power from and you want it to bypass all of the vehicle wiring so as to prevent a short from damaging any of the circuits. This is why you can't use the circuit at the rear of the vehicle.
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  • Do I Need To Run A Separate Power Line For My 7-Way Connector, Part EBTC7L
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    The black wire on the # ETBC7L should be run to the battery. The 12V cigarette lighter is meant to be used for accessories. Running the wire to your battery ensures that you do not cause any damage to your vehicle wiring if something were to draw too much power. I have attached an installation video so you can see what the process is like.
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    Sorry to hear about the troubles you're having with the 7-Way RV Upgrade Kit for Trailer Brake Controller Installation # ETBC7L on your 2022 Subaru Outack Wagon. Apart from checking for blown fuses, the only other thing you'll want to verify is, that your grounds are secured properly to a clean, bare metal surface. You'll also want to verify that your trailer connectors as well as your grounds are clean and free of rust and corrosion. If you're still having issues after checking, let...
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  • How to get 12 Volt Power to a 7-Way on a 2003 Toyota Tacoma
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  • 4-Way to 7-Way Adapter Recommendation for Installing Curt Echo Mobile Brake Controller
    Since your plan is to use the Curt Echo part # C51180 the 4-way to 7-way adapter you need is the part # ETBC7L which was made with the Echo in mind. It comes with the correct size breakers and wire gauge that the controller needs which happens to be 12 gauge and 40 amp.
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  • Where Does the Blue Wire Go On the 7-Way When Using the Curt Echo
    If you are using the Curt Echo Mobile Trailer Brake Controller part # C51180 with the Universal Installation Kit for Trailer Brake Controller part # ETBC7 or part # ETBC7L then you only need to run the black wire to the battery and then the white wire to a ground. The blue (brake output) and yellow wires do not need to be run and can just be tied off. I think this is what you are asking but if not please just let me know.
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  • Installing 7-Way Trailer Connector on a 2018 Toyota Highlander Hybrid
    Instead of extending the black wire from the 7-Way plug in 7-way upgrade kit part # ETBC7 to the battery under the hood you would extend the black wire from the plug to the positive side of the battery in the back of the vehicle with a 40 amp circuit breaker. You would then need to extend the power wire from the brake controller adapter back to the battery in the back of the vehicle with a 30 amp circuit breaker. The ground wire of the brake controller would need to be extended back to...
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  • Will the 7-Way RV Upgrade Kit ETBC7L Charge the Trailer Battery When Using Curt Echo
    The 7-Way RV Upgrade Kit for Trailer Brake Controller Installation part # ETBC7L and the Universal Installation Kit for Trailer Brake Controller part # ETBC7 will both still charge your trailer's battery even when using the Curt Echo Mobile Trailer Brake Controller part # C51180. The onlybdifference between these two kits is that the latter comes with extra wires and circuit breakers which are needed for a in-cab brake controller but you could still use this with the Curt Echo as well if...
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  • Recommended Brake Controller and 7 Way Connector for 2006 Acura RX 400h
    Because you're only going to be towing occasionally, I recommend using the Curt Echo Mobile Brake Controllers # C51180 because it's the easiest to install. Because you don't have a factory 7 way connector on your 2006 Lexus RX 400h, you'd normally be required to hard wire in a brake controller, but the Curt Echo just plugs into a vehicle 7 way connector and then accepts your trailer plug to provide you with an install brake controller. The Curt Echo is also easy to use, since it's controlled...
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  • Easy to Install Brake Controller Recommendation for 2020 Toyota Highlander with 4-Way
    The 4-way trailer wiring you have now will not control trailer brakes as that type of connector only covers the basic turn signals, stoplights, and running lights. To control trailer brakes you'd need to convert that to a 7-way and install a brake controller to actuate the trailer's electric brakes. So the easiest to install brake controller that also works really well is the Curt Echo Mobile part # C51180. Basically this just plugs into an active 7-way and once you sync it to your phone...
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  • 7-Way Kit Recommendation For Installing Curt Mobile Echo Brake Controller
    We actually have a version of the # ETBC7 that was specifically put together for the Curt Echo Mobile brake controller part # C51180 with the part # ETBC7L which is what you'd want. This only comes with the components of the ETBC7 that you'd need to install the controller. I attached an install video for it for you to check out as well.
    view full answer...
  • How does Curt Echo Distinguish Brakes from Signal Lights?
    The Curt Echo # C51180 works differently from a normal brake controller since it is wireless. In order to activate your trailer brakes, the Echo needs to detect that both the left and right brake lights are illuminated and that the vehicle is decelerating (detected via internal accelerometer). If it only detects one of your turn signals, no power will be sent to the trailer brakes. In the case that you need to use your hazard lights while using the Echo, there is a specific setting to address...
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