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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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7-Way RV Upgrade Kit for Trailer Brake Controller Installation - 12 Gauge Wires Installation Kit 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. Call 800-298-8924 to order etrailer accessories and parts part number ETBC7L or order online at etrailer.com. Free expert support on all etrailer products. Guaranteed Lowest Price 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

  • 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, 30-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

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

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

Video Transcript for etrailer Trailer Brake Controller 7-Way RV Upgrade Kit Review

Shane: Hi. I'm Shane from etrailer.com. Today we're gonna be taking a look at the ETB27L wiring kit for wireless brake controllers.This is gonna give us our seven pole connection and our four pole connection to provide us with the proper lighting to safely tow our trailer. How this kit is different than the ETB27, this one is designed to be used with wireless brake controllers. With the ETB27, we're gonna have wires we have to run inside the cab of the vehicle and hook them to our brake controller, which is mounted to the dash. This eliminates that.

All you need from this is a power wire going to the battery.Now, as far as mounting this, if your hitch has a pre-welded bracket, your kit's gonna come with a bracket for the plug that's gonna mount directly to it. If your hitch does not have that bracket, you can find no drill mounting brackets here at etrailer.com. They'll mount directly to the hitch.As far as the wiring, it's gonna require a four pole plug coming from the vehicle. If you don't have one, you will have to get one installed.As far as mounting our plug onto our bracket, you're gonna get four screws or bolts in your kit that allow you to mount that plug to that bracket. Your four pole plug, the bracket's gonna have a cutout, it just slides right into place.

The case is gonna be constructed of a durable plastic. It's gonna hold up in all weather conditions. It's gonna hold up against UV rays, so we're not gonna have to worry about it cracking or breaking. It's gonna have a spring loaded lid so that when we're not using it, it stays closed. On the inside of the lid, we're gonna have a foam ring that's gonna seal right around this edge.

It's gonna help keep any dirt and debris and moisture from getting on our connections.Our four pole plug is gonna have a nice dust cap also to help protect our connections from dirt, debris and moisture.Now that we've gone over some of the features, let's show you how to get it installed.First thing we need to do is we need to mount our seven pole plug. Our Draw-Tite hitch here that they have already mounted has a pre-welded bracket for mounting that seven pole plug, or four pole plug. This bracket here is gonna come with the ETB27L, so we're gonna mount right to that bracket. Now we'll mount our seven pole plug onto our bracket. On each one of our bolts, we need to put a flat washer, a lock washer, and a nut.We're gonna have two four pole plugs that come attached to our seven pole plug.

We want the one with the cap. We're gonna mount it right next to our seven pole. That gives us our four pole connection if we need it. We're gonna take the other four pole wire, but we're gonna plug it into our four pole wire that we had previously installed. That's gonna give us all of our light functions to our trailer.I'm gonna take some dialectic grease and I'm gonna put it on my connections for my four pole wiring. It's gonna help keep my connections from corroding if any moisture or anything gets on them. Plug them together.Our blue and yellow wire, we're not gonna be using. What I'm gonna do is I'm gonna tape all of this together. I'm gonna put a zip tie around these two. This is gonna hold my two plugs together. Go ahead and cut off my cover because I'm not gonna need it. Now I'm gonna take some electrical tape and I'm gonna tape over all of this, including my blue and yellow wire. The only thing we're gonna need to do is run our black wire to the front for power. Ground wire, I'm gonna ground, I think I'm gonna try to ground it right here on top. I'm gonna get it taped up first, and then we'll see where we can get to with it.Now, I chose to take this cover off right here. You'll have a couple pushpin fasteners on the bottom, and then on the inside, right along this edge, they're just plastic clips. They clip right into the back of the fascia, and then you'll have some blue clips on the ends that hold it in place on each end. I'm removing this because I'm gonna ground my ground wire right here. With this panel in place, I can't get my drill in there to do it.When grounding your wire, it doesn't necessarily have to be here. You just want to make sure it's on metal.Next, we need to connect our power wire. You're gonna get a bundle of black wire with your kit that you need to run to the front and up to the battery. Let me show you how I ran it. You want to make sure when running it you stay away from anything hot or moving. I went over top of my rear axle, right next to my fuel tank, right along this hard line, and underneath this panel. I didn't have to take the panel off. It's pretty flexible, so I just pulled down here and fed it through, and just kept working it all the way up to the front here. This is where my wire came out.I'm using airline tube from my battery. I got it down here. I'll hook my wire up to it and it'll help me pull it back up to the top. If you don't have airline tube, you can use wire hanger, anything like that. Something to get you down close to the firewall. Hook our black wires together and crimp it down.Now we'll mount our circuit breaker. You want to find somewhere preferably metal to mount to. If you're gonna mount it to plastic, just make sure it's a durable plastic. I'm gonna go right here along this front frame piece.I ran my wire behind this existing wiring here just to help keep it tight. Now I'm gonna cut it to size. The wire coming from our seven pole is gonna go onto this silver post and then we'll take the existing wiring or the extra, go from the copper post to the positive side of the battery. Go ahead and cut that to size, inaudible 00:06:38 it back, and then we're gonna add on a small ring terminal.Take our extra wire, add our second small ring terminal, wrap this around just like this, and I think I'm gonna go ahead and leave it that length. I'll add on our large ring terminal. We can remove that nut and add it to the positive side of our battery.Now we'll test out our wiring using any alternate power source. Left turn, right turn, running lights, brake lights. That's gonna complete our look at the ETBC7L wiring hit for wireless brake controllers.

Customer Reviews

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

Average Customer Rating:  4.1 out of 5 stars   (12 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.


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. 647400


I bought a few different items and had a wonderful lady over the phone who helped me picking out the right stuff and also to save me money. I gave everything 5 star rating except for this one. The reason is two-fold. 1) the instruction video was not good at all and the look and setup of the car in the video was different than mine which forced me to do solutions on my own which feels so and so since I'm neither a car mechanic nor an electrician. Also, the most difficult part of it all, to snake the wire to the front, was shown by flashing the camera for a few seconds... instead i had to remove covers underneath the car and improvise on my own 2) the kit wasn't complete and I had to make runs to the hardware store to buy extra bolts/nuts to assemble the bracket. And the wire itself was barely long enough to make it to the battery which was another reason I had to come up with my own McGyver solutions and wasn't able to follow the guiding instructions from the video. In short, the installation took way longer than expected and left me worried if it'll work. It is done and is working so far, but I would recommend an updated video and more generous length of wire plus extra bolts/nuts for future kits... 628631


Easy install, Perfect setup to mate to my Subaru wire harness! 613156


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. 638383


Good quality product. Not all hardware needed for install is included in this kit. You will need to get some nuts and bolts or screws to mount the bracket to your vehicle. You will also need to get additional wire to reach your battery, there is not enough length included. I do like the quality of the product and would recommend it. 746120


I purchased a "new" to me 2015 Porsche Cayenne. It was not equipped with the towing package, so........off to etrailer I go! These guys are the go-to experts in this stuff. They hooked me up with the wiring kit to have my car, talk to my trailer. The kit comes with plenty of wire, and zip ties to make a clean installation. I had some help installing the kit, but that was more due to my not wanting to screw it up. The instructions and information provided was first rate! Thanks. 715395


In this kit there is 16 ft of 12 gauge stranded wire for connecting the trailer plug to the circuit breaker located near the car battery. In my case it was 4 ft too short. That's not counting an additional 18 inches that was needed to connect circuit breaker to battery terminal. This required me to make a trip to hardware store to purchase more wiring. I see several reviews stating the same problem with not providing enough wire for the installation. I would have gladly paid another few dollars for this kit to get a 25 ft wire. Everything else was good with the kit. 708408


It took only 1 hour to install!! 703225


The product installed reasonably well however, the included 12-gauge wire was nowhere near long enough to reach the battery in our van, and we had to buy a longer replacement for it to finish the wiring. 671062


This product is good but has a few problems preventing it from being great. First it doesn’t include the screws and washers that you need to actually connect it to your hitch. Second and the most important factor is that the kit barely has enough wire to hook up a small SUV let alone a mid or full size one. Save yourself some headaches and buy a new set of wire before you even start. The wire came up feet short in my Kia Sorento but only figured this out after running it all the way to the engine to have it stop. 670202


Great service 639271


Easy to follow video made installation a breeze. 619466


Ask the Experts about this etrailer Accessories and Parts

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    Since your plan is to install a brake controller and want to charge the camper battery what you need is actually the part # ETBC7. This comes with basically the same things as the # ETBC7L except it also includes wiring and circuit breaker to complete the brake controller circuit that you use for charging the trailer battery. I attached a video that shows this kit installed on a similar 2011 Subaru Outback for you to check out as well. The brake controller in the video is our best selling...
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    If you already have a 4-way trailer connector on your 2017 Ford Expedition and you need a 7-way trailer connector then I have two options for you. Please note that if the trailer you are towing has a 7-way trailer connector then odds are this is because it has brakes therefore you will need a brake controller as well. The first option I have for you requires the least amount of modifications to the tow vehicle and it will be the easiest to install. This option entails both the 7-Way...
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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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    To install the Curt Echo Brake Controller # C51180 on your 1999 Suburban with a 4-to 7 Pole adapter, like the one on our # ETBC7L 7-Way RV Upgrade Kit, you just need to plug it into the 7-Pole on the adapter. As long as it was installed correctly, and the rest of the connections were made, the adapter's 7-Pole will contain all of the trailer light functions that were originally on your 4-Pole flat connector, plus the additional functions for trailer brakes, 12V power, and reverse lights...
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    I suggest using the 7-Way RV Upgrade Kit part # ETBC7L and the Curt Echo part # C51180 because of the ease of installation and convenience. The Curt Echo Mobile Trailer Brake Controller just needs the basic trailer lighting functions and 12V power to be fully operational. Just wire the 12V black wire from ETBC7L to the vehicle's battery via the circuit breaker, ground the white wire and connect the 4 pin to the 4 pin portion of the plug shown in the picture I attached. The rest of the wires...
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  • Why Does Black Wire of ETBC7L Run to Vehicle Battery
    If you have a power wire ran to your current 4-way wiring it's to power the taillights of your trailer from the battery instead of your vehicle taillights. The 12 volt power wire of the # ETBC7L is then for providing a 12 volt power source to the trailer or for a brake controller that installs on the trailer like the Curt Echo Mobile part # C51180. I attached a review video for this for more info on this kit as well.
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    The power wire of the # 119250KIT would not be rated high enough to carry enough amperage for both the # 119250KIT and the Echo part # C51180. So what you'd want to do is run the wire that comes with the # ETBC7L along the same routing to get the the vehicle battery and you'd be set. This also prevents a short in the trailer wiring from potentially shorting out the brake controller and damaging it since they will be on separate circuits. Having two 12 volt wires ran to your battery would...
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    Correct, you will need to use a 7-way trailer connector in order to tow a trailer with brakes. The 4-way trailer connector simply does not have the extra pins needed for the trailer brake and battery charge circuits. The good news is that it is super easy to install a 7-way and brake controller on a 2016 Honda Odyssey thanks to the invention of wireless brake controllers that eliminate the need to splice into the vehicles wiring or run a bunch of wires from the cab to the battery. I...
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  • Is Wire Needed for Brake Controller Wiring Kit # ETBC7L on 2015 Hyundai Santa Fe Limited Ultimate
    For your 2015 Hyundai Santa Fe Limited Ultimate the T-One Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector # 118269 is a very easy installation. The plug location is under the vehicle on the driver's side and requires no running of additional wire to power your 4-way. That does change when you add the 7-Way and brake controller as you will need to run at least the 12V power wire (the brake controller output blue wire does not get connected and the yellow...
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  • Why Isnt the Blue and Yellow Wire Needed In Curt Echo Installation
    I am happy to explain why the yellow wire and blue wire are tucked away in the installation video of 7-Way RV Upgrade Kit for Trailer Brake Controller Installation part # ETBC7L. The ETBC7L is a kit used to install the Curt Echo Wireless controller part # C51180 which only requires a 12V power feed from the vehicle's battery and ground wire. The blue wire (which is used for brake output) is not needed because the Echo uses an internal sensor to sense when the vehicle's brakes are applied....
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  • Brake Controller Recommendation For 2020 Kia Telluride
    The Curt Echo Mobile Trailer Brake Controller part # C51180 will fit any vehicle that has a 7-way plug with a power wire to the vehicle's battery and a good ground connection. It is not in the fit guide yet for the 2020 Kia Telluride (August 2019) but you will not have any issues using the Curt Echo brake controller with the Telluride as long as you have an active 7-way plug. If you do not have a 7-way plug on the Telluride, you will need a 4-pole connector to start with part # 118784...
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  • Where is the Blue Brake Output Wire Ran When Using the Curt Echo
    The blue electric brake output wire from the back of the adapter on part # ETBC7L will not be needed when using the Curt Echo Mobile Trailer Brake Controller part # C51180 as the controller operates off an inertia sensor and the stop light switch circuit. The blue wire can just be taped off and secured to the vehicle. The black 12 volt power wire on the adapter will however still need to be ran to the vehicle's battery with a 40 amp circuit breaker placed 6" from the positive terminal.
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    I have the perfect solution for you to easily add a brake controller to your 2008 Lexus RX 350 without running a bunch of wires. If you install the 7-Way RV Upgrade Kit # ETBC7L then all you need to do is connect the adapter to your current 4-Way and then route the black wire to your battery through the included circuit breaker. This then gives you the lighting functions and 12V power on your 7-Way. Once this is installed the brake controller you will use is the Curt Echo # C51180....
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    Yes, the 7-Way RV Upgrade Kit for Trailer Brake Controller Installation part # ETBC7L will absolutely work on a Honda Pilot and then allow you to use the Curt Echo Mobile Trailer Brake Controller part # C51180. The 7-Way RV Upgrade Kit will plug into the 4-way you have now and then you must run the black wire to the battery and the white wire to a ground but that is it, no other connections will be needed/required. This option is by far the easiest way to go to install a brake controller...
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    Yes, the 7-Way RV Upgrade Kit # ETBC7L is EXACTLY what you need to install the Curt Echo Mobile brake controller part # C51180 in your 1998 Ford Explorer that has a factory 4-way. The extra blue wire would not get used and could be taped up and out of the way as needed.
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    If you will be using the Curt Echo Mobile Trailer Brake Controller part # C51180 then the 7-Way RV Upgrade Kit for Trailer Brake Controller Installation part # ETBC7L is preferred as it does not come with a bunch of extras you will not need. In regards to installing this, all you will need to do is run the single black wire that comes with the kit from the black wire on the back of the 7-way up to the vehicle's battery with a circuit breaker in between and then ground the white wire from...
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    It really power your observation camera from your 2018 Toyota Highlander, the first thing you will need is a 7-way with a 12 volt charge, so start by installing the 7-Way RV Upgrade Kit # ETBC7L, which is generally used for wireless brake controller compatibility but is perfect for what you're looking to do. You'll also need the Bargman 7-Pole Round Connector w/ Hardware - Trailer End # 54-67-525 for your trailer and can cap off the unused wires on both of the 7-way connectors and...
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    If you purchased a 4-Way/7-Way Hopkins adapter like part # 37185 so that you can use the Curt Echo Mobile Trailer Brake Controller # C51180 then you are correct about only needing to connect the 12V power wire for the brake controller (in addition to connecting the typical trailer light circuits and ground). The reverse light wiring is optional and is really only needed if your trailer has a separate circuit for the reverse lights. We actually created the kit # ETBC7L for people who...
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  • Wiring Needed to Use Curt Echo Brake Controller on a 2006 BMW X5 with 4-Way Flat Connector
    You are most of the way there! The Curt Echo Mobile Trailer Brake Controller # C51180 that you purchased for your 2006 BMW X5 just needs the basic trailer lighting functions and 12V power to be fully operational. A 4-Way Flat connector like the popular Tekonsha ZCI # 119250KIT provides the basic trailer lighting functions so once that is installed you simply need to install the 7-Way RV Upgrade Kit # ETBC7L. This includes the 4-Way to 4-Way/7-Way adapter as well as wiring for you...
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  • Recommended Brake Controller for 2018 Subaru Outback
    For a brake controller I recommend taking a look at the Curt Echo # C51180. This is a really unique controller that will simply plug into the 7-Way connector on your Outback and pair with your smartphone via Bluetooth after downloading the free app. This allows for a really simple installation and setup and eliminates the need for a separate unit to be permanently mounted inside your vehicle like other controllers. Its built-in accelerometer will activate the trailer brakes at the same...
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Info for this part was:

Edited by:
Lindsey S
Expert Research:
Jameson C
Video Edited:
Joshua S
Video Edited:
Jacob T
Installed by:
Kathleen M
Installed by:
Cole B
Updated by:
Sarah W
Updated by:
Kristina F
Test Fit:
Shane H
Written by:
Mike S
Video by:
Michael B

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