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Curt Trailer Connector Adapter - 4-Way to 7-Way RV and 4-Way Flat
CURT

Curt Trailer Connector Adapter - 4-Way to 7-Way RV and 4-Way Flat

Part Number: C57672
$36.89
Retail:$49.80
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Trailer Wiring
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This multi-function, vehicle-end connector converts any 4-way flat, vehicle-end plug to a combination 7-way outlet and 4-pole flat outlet. Great Prices for the best trailer wiring from CURT. Curt Trailer Connector Adapter - 4-Way to 7-Way RV and 4-Way Flat part number C57672 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (412)
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CURT Trailer Wiring - C57672

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

This multi-function, vehicle-end connector converts any 4-way flat, vehicle-end plug to a combination 7-way outlet and 4-pole flat outlet.


Features:

  • Adapts 4-way flat to both 7-way RV and 4-way flat
    • 4-Way flat output connects tail lights, brake lights, and turn signals
    • 7-Way connects tail, brake, reverse, turn signals, and auxiliary power
  • Dust covers keep connectors clean when not in use
  • Split loom keeps wires contained and well protected
  • Simple installation
    • Wiring harness plugs into existing 4-way flat connector and hardwires to existing wiring to get additional functions needed for 7-way
  • Included hardware and metal mounting bracket secures wiring to the vehicle or trailer hitch
  • 1-Year limited warranty


Specs:

  • Distance between bracket mounting holes center to center: 2-1/4"
  • Harness length: 17"
  • Yellow wire is for reverse lights
  • Blue wire is for brakes
  • Black wire is for 12 volt power
  • White wire is ground


57672 Connector Diagram



57672 Curt Multi-Function Socket - 7-Way RV Blade and 4-Way Flat - Universal Fit

Installation Details C57672 Installation instructions


California residents: click here


Customer Satisfaction Score:


Customer Reviews

Curt Trailer Connector Adapter - 4-Way to 7-Way RV and 4-Way Flat - C57672

Average Customer Rating:  4.7 out of 5 stars   (412 Customer Reviews)

This multi-function, vehicle-end connector converts any 4-way flat, vehicle-end plug to a combination 7-way outlet and 4-pole flat outlet.

by:

I just installed this on my 2015 Volvo XC70. I also used the Curt XC70 plug and Play for wire kit. I watch two of etrailers excellent insulation videos. Installing the hitch and both the wiring products took me around 3.5 hours. I think Curt products are great and they are reasonably priced! e-Trailer makes your DIY installations easy. You just need to take your time when removing interior panels and double check your work. I used Volvo's torque specs for the bumper parts when I installed the hitch. E-trailer doesn't stop with just hitches and wiring solutions, they have just about anything you need to load and haul overhead or behind safely. What about performance? E-trailers got you covered. If you get in a jam during the insulation, don't fret or worry, call the text at e-trailer and they'll walk you through it. I want to thank E trailer and their professional staff for helping me with my truck and auto towing and lighting solution for over 10 years now!



by:

This was/is a critical piece of any towing system, and as such requires extra care to hook up properly . I would recommend testing each connection as you hook it up being extra careful to make sure you are matching the terminals in the mating connector properly. This harness/connector performs perfectly when properly installed.



by:

Worked great for me. Ran my own wiring. In retrospect I would just order the kit from Mopar but this did the trick!



by:

The connector works as expected and installed easily, but it would be better if there was a better way to store the flat connector instead of having it slide into the bracket from the side.



by:

So far, so good. Haven't installed it yet, but have installed similar one on another vehicle. Have to find good path for the power wire up to the battery.



by:

Nearly plug and play. Makes for easy wire identification and installation.



by:

I used this on my 2017 RAV4. This harness provides me the flexibility of using flat-4 or a 7 way connector for towing flexibility. The RAV4 is a small tow vehicle and I like the added security of electric brakes even on lighter single axle trailers which the 7 way allows. I plugged this adapter into the flat-4 connector provided by the "T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector Item # 118578" and used heat shrink tubing around the crimp connectors for the brake controller wires to keep moisture out.



by:

Good product easy to install only reason for 4 stars is that the 4 pin connector doesn’t stay in the provided slot on the bracket



by:

Your site us very helpfull for information and support and i reallt apreciate etrailer for all tge purpose.good product ,help support,and fait delivery even heure in Canada.
Tgank to all of your team.i am presently installons the controller on my car after the installation i Will feed about how it work.
Have a nice day

Luc profile picture

Luc

7/30/2023

Very well great product,goid brake controll ,smooth,ibreally like the way it work,and Allo it take juste à small place under dash for me 10 star a grest product

Luc profile picture

Luc

7/30/2023

Great product the curt7pin with the 4 pin on the side really helpfull for installation good product ,to be sure keeping moisture away in the connector i Also use electric compound grease in it to prevent corrosion and still very good no connection problem yet even with the kind of weather we have here up North in Quebe crain ,snow,..good product well made.



by:

Needed to slightly modify the bracket clearance holes to have the plastic holes line up properly and fit cleanly. Not a big deal but someone else may have struggled with that if they expected a simple install.



by:

Installed it myself and towed my camper from NC to Cali with it! Worked great and held up the whole time!



by:

The connector fit the existing mount on my 2007 Dodge Ram 1500 bumper perfectly. Four bolts and nuts, plug in the wiring, and I'm ready to roll. Thanks, etrailer! Another great product!



by:

Easy to install.



by:

Works well for our needs!



by:

THE people to go to for trailer and towing stuff. Myself and friends all order here, can't say enough about the great customer service, always getting the right parts, and the overall quality. It is always a pleasure.



by:

Turned out I didn't need this part. Was surprised at the charge billed for the return. Seemed high.



by:

Like this a lot.



by:

Works perfectly. No problems at all.

Just
an FYI, the installer didn't hook up the reverse wire although we asked. This is a common practice according to our camper's manufacturer so be adamant with your installer if you want the wire connected.



by:

Great all in one unit



by:

Not even 2 years after install all rusty. Electric brake pin broke due to rust.
Impossible To remove 4 bolt holding connector due To rust. I do not recommend

Katrina B. profile picture
Etrailer Expert

Katrina B.

7/19/2022

Its unfortunate that your pins and bolts are unusable due to rust. I see that you are located in Canada, we recommend making sure that you are using dielectric grease often to prevent and keep the rust from spreading along the harness. Unfortunately, rust is not covered under warranty, and even if it was, this is well passed the one-year warranty for this item. I would recommend contacting our customer service department for them to assist you in ordering a new harness, such as part # 118467.



by:

Good product overall, installed on my 2016 Volkswagen Golf to tow a 13' Scamp fiberglass trailer. Although do be attentive, as other reviews have stated, that using all the functions of the 7-pin connector (electric brakes on the trailer) may require extra work. In my case, it required running an extra lead from the car battery with a fuse in line. I was was able to run it through the body of the vehicle, although I gather it's also possible to run it under the entire vehicle. Just something to be aware of; as my first time towing anything, it was a learning curve to understand how to put it all together.



by:

I had an existing 4 pin, this plugged in and gave me the 7 pin I needed for picking up my teardrop. I did not use the other wires and just taped them to the casing. Worked perfect.



by:

This would be a 5 star rating if all my trailer plugs fit equally well. The preformed trailer wiring plugs are a perfect fit, (4 out of my 6 trailers have them), but two aftermarket plugs are a struggle to get the retention notch to fit inside cover hook that keeps the plug in place. ((Otherwise the plug pops out)).
Bottom line is I would buy this connector again because of the price point and ease of installation. From now on I will be buying the preformed trailer wiring harness for the perfect fit.



by:

Overall, satisfied. The installation videos were helpful, and the product seems quality. I only have one complaint, which is what kept this from being a 5 star review. This may be obvious to most people, but it wasn't to me. This WILL get you to a 7 pin connector, but there is a good bit more work to do to get all the functions of a 7 pin connector to work. Meaning, to get power to my 7 pin connector and trailer, I had to run a wire to the battery, and place a circuit breaker inline with that wire. Again, this may seem obvious to some, but it took some figuring out for me, and any time I asked this question to etrailer, they could never seem to give a straightforward answer. But for my Mazda CX-5, about 15 feet of 12 gauge wiring and a small fuse kit did the trick. Lots of splicing of course.



by:

Worked great for a while. Then the pins started to pull out and stick in the trailer plug. Have to pull them out of the trailer plug and push them back in.


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Show More Reviews

See what our Experts say about this CURT Trailer Wiring

  • 4-Way to 7-Way Adapter for Trailer Light Functions
    Thanks for reaching out, Jack! What I recommend using is the Curt Adapter # C57672 and securing it to your vehicle with the No-Drill Bracket # 18136. This gives you the ability to seamlessly use either the 4-Way or 7-Way connection but doesn't require you to wire up the 7-Way to be fully functional. For a quick solution we have the Hopkins Adapter # HM54RV, but this won't have any support for the connectors so I see them wearing down so I don't recommend going that route.
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  • Wiring and Circuit Breaker Kit for 4-Way/7-Way Connecter to Add a Brake Controller
    Hey Erik, thanks for reaching out! We can definitely get you to the # ETBC7 kit building off of your Curt Trailer Connector Adapter # C57672. What you need is the Wiring Kit # 5506 which has everything else in it aside from the circuit tester. If you don't already have a circuit tester then we have part # PTW2993 that works really well. These parts will work really well with the Redarc Tow-Pro Elite # RED44FR or Liberty # RED24FR for your 2022 Subaru Outback Wagon!
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  • What Parts Do I Need To Upgrade My 4 Flat To A 7 Way Connector And Use A Wireless Brake Controller?
    It sounds like you are definitely on the right track here. You would plug the Adapter # C57672 into the existing 4 flat plug. Then the Kit # C51500 contains the rest of the wires you will need to run to upgrade to a 7 way. From there you will be ready to plug in and use a wireless brake controller like the # C51180. Since the Curt echo works off of the vehicles brake lights, technically you would only need to connect the 12v wire to the 7 way plug in order to use it. The additional wires...
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  • Best Way to Add a 4-Flat and 7-Way Connector to a 2007 Jeep Grand Cherokee w/ out Tow Package
    I have a couple of wiring harnesses that will add a 7-way and a 4-flat to your 2007 Jeep Grand Cherokee. However, since you do not have the towing package the 7-way harness is going to need to be wired in. The first wiring harness you will need is the Tekonsha T-One Vehicle Wiring Harness item # 118425. This custom-fit T-One connector plugs into your Jeep's wiring harness, which is located behind the driver's-side and passenger's-side tail lights. This will provide you with a 4-flat connector....
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  • Adding A 7 way Plug To A 2019 Toyota Highlander With A Factory 4 Flat
    I can definitely help set you up. You can use the adapter like the # C57672 you mentioned. You can plug into the existing 4 flat plug. You would also need to run additional wires for a brake controller. We make a kit # 5506 specifically for this purpose. This will be everything you need to get the 7 way plug working. The last thing you need will be a brake controller. For that I recommend the Tekonsha Prodigy P3 # 90195. This brake controller is very user-friendly and will be easy to...
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  • Can Trailer Brakes Function Without a Brake Controller on 2022 Hyundai Palisade
    That is correct. A 7-way adapter like the Curt Trailer Connector Adapter # C57672 has a blue wire which connects to a typical brake controller in your vehicle. The brakes on your trailer cannot be used without a brake controller. You need the brake controller to send the signal for braking in order for your brakes to function. You can, however, use the Curt Echo # C51180 without running the blue wire off of the back of the adapter. The Echo plugs in-line with the 7-way at the back of...
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  • Recommended 4 Pin Male To 7 Pole Vehicle End Adapter
    When it comes to getting a wiring adapter that goes from a 4 pin male to a 7 pin round adapter I recommend The Curt Trailer Connector Adapter - 4-Way to 7-Way RV and 4-Way Flat # C57672. The harness is 17 inches, and has a simple installation where the wiring harness plugs into the existing 4-way flat connector and hardwires to the existing wiring to get additional functions needed for 7-way. I attached a review video link below.
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  • Parts Needed To Tow a Trailer With a 7-Way Connector Behind a 2022 Toyota RAV4 Hybrid
    Yes, the Curt Trailer Hitch Receiver # C13416, Curt T-Connector Vehicle Wiring Harness # C56434, and Curt Trailer Connector Adapter # C57672 are what you need to tow with your 2022 Toyota RAV4 Hybrid. I do recommend the Universal Installation Kit for Trailer Brake Controller # ETBC7 over the Curt Adapter # C57672 as the installation kit contains the wiring and circuit breakers you will need to run power for the charge line and add a Brake Controller # RED52VR. The etrailer Ball Mount...
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  • Wiring Required To Use Curt Echo Brake Controller On 2021 Mazda CX-30 With 4-Way Flat Connector
    The Curt Echo # C51180 does require the charge line on your 4 to 7-Pin Connector # C57672 to have power and ground connections. As long as you have this connected and a properly functioning 4-way on both your 2021 Mazda CX30 and 2022 Hyundai Tucson you will be able to use the Echo with both vehicle. If not you will need the Charge Line Kit # RM-156-75 to connect to each of the 4 to 7-Pin Connectors # C57672 on your vehicles.
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  • Can 7-Way Adapter Power Wire Be Same Wire as 4-Way Converter Box
    You actually don't have to run a power wire to the Curt 7-way adapter part # C57672 unless you need the circuit for like a battery charge or interior/exterior lighting on the trailer. If you don't have a need for that you can leave that circuit unconnected. Otherwise I would have to recommend using a separate wire from the converter box power circuit. One easier solution would be the # 10-2-1 which is a double bonded 10 gauge wire that basically allows you to run one wire but it's really...
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  • Parts Needed to Install 7-Way on 2005 Volvo XC70
    Hey Paul, you would first need to start with a 4-way on your 2005 Volvo XC70 which we have with the part # 46255. Then to convert to a 7-way you'd want the part # ETBC7 which also has a 4-way on the side of it. To operate the trailer brakes you'd then need a brake controller like the P2 part # 90885 and you'd be set.
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  • Will The Curt Trailer Connector Adapter C57672 Allow Me To Tow a Trailer With 7-Way, Vehicle 4-Way?
    The Curt Trailer Connector Adapter # C57672 will allow you to connect to the 4-way flat on your 2010 Lexus RX 350 and have a 7-way connector. The only functions that will work on the 7-way is the trailer running lights, brake lights and turn signals. While the trailer weight may be within the specifications of your Lexus you will need to verify with your state laws that you can legally pull your trailer without the electric trailer brake. You can easily add the Curt Echo Brake Controller...
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  • Easy 4-Way to 7-Way Brake Controller Solution for 2020 Kia Sorento
    To activate trailer brakes you do have to have a brake controller installed in your 2020 Kia Sorento. I do have a really easy solution thought that uses a similar adapter to the # C57672. So for a brake controller I recommend the Curt Echo Mobile # C51180 which basically plugs into an active 7-way and once synced to a smart phone can easily activate trailer brakes. Now the 7-way adapter kit you'd want instead is the # ETBC7L which comes with a similar 4-way to 7-way adapter and also comes...
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  • Does the Alarm Always Sound in Reverse on the Curt Trailer Connector Adapter with Backup Alarm?
    Any time your vehicle is placed in reverse, whether you are towing or not, the alarm will sound on the Curt Trailer Connector Adapter with Backup Alarm item # C57102. To have the same connector without the beeping sound you will want the Curt Trailer Connector Adapter item # C57672. This is the same 7-way and 4-way connector without the alarm. I have linked an installation video below.
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  • Mounting 7-Way to etrailer Hitch e98844 on 2019 Toyota Highlander
    Thank you for the purchases, and there is a way to mount the Curt Trailer Connector Adapter - 4-Way to 7-Way RV and 4-Way Flat # C57672 directly to the etrailer Trailer Hitch Receiver # e98844 on your 2019 Toyota Highlander. Since the hitch is directly under the bumper, what you can do is simply add a mounting bracket: - No-Drill Mount Bracket, Long # 18136 This mounting bracket will secure directly to the hitch with the included hose clamp, and you'll then screw in the Curt 7-way directly...
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  • Trailer Hitch & 7-Way With 4-Way For 2022 Jeep Grand Cherokee L
    I'd love to tell you yes, you can use the Hopkins part you mentioned, but that will not work for your 2022 Jeep Grand Cherokee L. That's a plug-in replacement 7-way and 4-way, and isn't compatible with wiring on your Jeep. There isn't a similar look but you can add a 7-way that has a 4-way plug on the side to your Grand Cherokee L with the following: - Curt Trailer Hitch Receiver # C96NR - Curt Wiring Harness with 4-Pole Flat Trailer Connector # C27BR - Universal Installation Kit for...
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  • How to Use a 4-Pin to 7-way Trailer Connector Such as C57672
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  • Can I Use Both The 7-Way and 4-Way At The Same Time?
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  • Can Curt Echo Brake Controller be Installed in 4-Way/7-Way Adapter and Still Work
    That's actually a really good question! All the Curt Echo # C51180 needs to operate properly are the basic trailer lighting functions (found on a typical 4-Way), and then 12V power. If you already have a 4-Way/7-Way adapter like part # C57672 then all you'll need to do is run a length of 10 Gauge Wire # 10-1-1 to a 30A Circuit Breaker # PK54530 and then to the positive battery post on your tow vehicle. If you don't already have an adapter then you can just get the Upgrade Kit # ETBC7L...
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  • Does Blue Ox Patriot Portable Braking System Require Connection To Vehicle Battery
    The Blue Ox Patriot Portable Braking System - Proportional # BLU37TR needs power for proper function, so it does require a direct connection to your battery which isn't an issue on your 2015 Ford Flex. Some vehicle require a separate connection to the vehicle using # RM-9332 to avoid the other features drawing power. The Patriot has its own battery for emergency use only so you still need a power supply. Since you are worried about draining your battery, I recommend you use the Roadmaster...
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  • Which Battery Terminal Do I install Black Wire Of Curt Trailer Adapter On My 1991 Ford
    Per instructions when installing The Curt Trailer Connector Adapter # C57672 on your 1991 Ford the black power cable will need to be attached to the red positive terminal on your battery per the instructions. This multi-function, vehicle-end connector converts any 4-way flat, vehicle-end plug to a combination 7-way outlet and 4-pole flat outlet. I attached a review video link below.
    view full answer...
  • What is the Difference Between the ETBC7 and Curt 57672
    The # ETBC7 or # ETBC7L will differ from the Curt # C57672 in that these two parts both come with all of the wiring, breakers, mounting bracket and connectors needed to complete the job; the Curt # C57672 is just the 7 way connector without any of the wiring, breakers or the mounting bracket. Other that than, both connectors are the same.
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  • How Does 7-Way Trailer Adapter with 4-Way Connector Install
    What you have pictured is a 4-way to 7-way adapter similar to part # C57672. The male side 4-way connector plugs into a vehicle side (female) 4-way to convert the vehicle's connector to a 7-way. The existing 4-way on the vehicle only has the lighting functions so the rest of the wires need to be hardwired to make the 7-way completely functional. The additional wires are to power reverse lights (yellow), the 12 volt auxiliary pin (black), and electric brakes (blue). The white wire is...
    view full answer...
    Image 1 for
  • How To Install A 7-way Connector On 2017 Ford Edge
    To install a 7-way connector on your 2017 Ford Edge you will first need to install a 4-way connector. I recommend the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat # 118669 if your Edge is an SE or SEL, and the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat # 118677 if your Edge is a Sport or Titanium. We have had great results with the Tekonsha T-One Harness's, and they offer a plug and play installation that only requires you to run a power wire to your vehicle's battery...
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