bing tracking image
  1. Trailer Wiring
  2. CURT
  3. Wiring Adapters
  4. Multi-Function Adapter
  5. 4 Flat
  6. 7 Round - Blade
Curt Trailer Connector Adapter - 4-Way to 7-Way RV and 4-Way Flat

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

Item # C57672
Retail:$56.44
Our Price: $36.10
You Save: 36%
Trailer Wiring
Add to cart
In Stock
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Customer Photos

Need help with installation?
Locate installers near me
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.
  • All Info
  • Reviews (396)
  • Q & A (0)
  • Photos

CURT Trailer Wiring - C57672

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

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   (396 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:

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



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

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

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:

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:

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



by:

No issues. Pretty good item.



by:

Works well for our needs!



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:

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:

Like this a lot.



by:

great service as usual.



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:

Great all in one unit



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:

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:

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:

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:

This is a great harness. And was easy to install and is still working great a year later.



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.



by:

Fast shipping, clear instructions, easy install, works great.
Thanks!

Bones

2/9/2023

Still working! Thanks!



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:

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

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:

Air lift installed on a 2018 Jeep Wrangler JKU with a 4” lift. Alison B put wanted to make sure I got the right bags and put me in touch with Air Lift who helped me get the correct bags. It was easier and quicker to remove rear springs and install the bags, just remember to apply lubricant to help with installation. Alison B was great to work with and extremely helpful in making sure I got the right parts. I have done business with etrailer in the past and will continue to use them in the future.


25
397
Show More Reviews

See what our Experts say about this CURT Trailer Wiring

  • Comparing 4-Way to 7-Way Adapter and ETBC7L Kit
    The main difference is just what you said, the # A10-7084VP is only the adapter and the # ETBC7L includes the bracket, connectors, a circuit breaker, and 20 feet of wire. The other significant difference is the adapter included with # ETBC7L has a 4-way and a 7-way so you don't lose the existing 4-way on your vehicle which is important to some people. It's similar to part # C57672 which also includes the bracket but not the other parts of the # ETBC7L
    view full answer...
  • Brake Controller Installation on 2000 Cadillac DeVille
    You can indeed install a brake controller on a 2000 Cadillac DeVille. As a first step, you'll need to access the taillight wiring circuits. The best and safest way to do this would be to use a powered taillight converter like # C59496. You could directly wire into the taillight circuits using a wiring kit like # 18252, but you'd lose the circuit protection offered by the taillight converter. The converter would protect the electronics in your vehicle from any short circuits that might...
    view full answer...
  • Which Wire and Circuit Breaker For 12v Accessory Wire On Curt Trailer Connector Adapter C57672?
    For the 12v Accessory wire on the Curt Trailer Connector Adapter # C57672 you have you will want to use # 10-1-1 and use a 40 amp circuit breaker # 9510. In addition you will need three of the ring terminals # DW05705-1. You will connect the wire from the 7-way connector to the silver post with a ring terminal, then another length of wire with ring terminals on each end from the gold terminal to the positive terminal of your battery. I included a few video reviews for you to take a look at.
    view full answer...
  • Will Curt Wiring Harness Fit With Draw-Tite 7-Way Mounting Box
    Both Curt wiring harnesses, part # C57674 or # C57672, will fit with the Mounting Box # 18159. The only problem is that these also come with 4-Way connectors as well which the mounting box doesn't have provisions for. I recommend using the Curt Wiring # C57674 along with the No-Drill Mount Bracket # C57202 which uses a similar strap to mount around the crossbar as the mounting box does. The difference in this case is that the bracket that comes with the Curt wiring is designed to accommodate...
    view full answer...
  • 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...
    view full answer...
  • Does 7-Way Adapter C57672 Have 4-Way Functions on 7-Way
    Yes, the 7-way adapter part # C57672 does give you the exact same features as the 4-way on the 7-way as well as this has a second 4-way on the side of it as well.
    view full answer...
  • Wiring Harness Recommendation to Fit In-Line with HitchMount LED Pod Reverse Kit
    Thanks for reaching out! The HitchMount LED Pod Reverse Kit has the standard US Car Connector on it which is pretty common on most 7-Way connectors. It actually looks like the Curt Wiring Harness # C57672 you're looking at doesn't have this US Car Connector so for your application I recommend checking out the Hopkins Wiring Harness # 37185 which has the same basic wiring connections but also uses that US Car Connector you're looking at.
    view full answer...
  • Troubleshooting Left Turn Signal and Brake Light Not Working After 7-way Adapter Installation
    To answer your question, yes, it could be a bad ground. I would double check the ground from your 4-way as well as the ground for the 7-way adapter. Make sure they are securely attached to a clean, bare metal surface. You may even consider moving the ground from the recently installed adapter to a new position. The ground wire on the # C57672 should be secured directly to the frame. If that doesn't fix it, I would check all of the connections related to the left turn signal and make sure...
    view full answer...
  • 7-Way Upgrade Kit to Install Curt Echo Brake Controller and Provide 12V Power for Trailer Battery
    If you have a 4-pole wiring setup now and you want to install a wireless trailer brake controller you will use an adapter like Curt # C57672 or Hopkins # 37185. Both install by plugging in to your 4-pole and by making additional wiring connections using the pigtail leads. If you want to use a wireless smartphone-controlled brake controller like the Curt Echo # C51180 you will not need to run a blue brake output wire. All you'll need to do is provide a 12V power connection to the adapter....
    view full answer...
  • Since The Curt C56407 Harness Already Has A Power Wire, DO I need To Run Another One For A 7 Way?
    The black power wire on the # C56407 is just for the powered converter as not all vehicles can handle the additional amperage draw of trailer taillights. This line will not provide the needed power for a battery or other accessory on your trailer, so you will need to run both. But on the plus side, already having the one line run will make running the second one for the # C57672 a lot easier. If you do not already have the wiring needed to do this, the Wiring Kit # 5506 will include all...
    view full answer...
    Image 1 for
  • Curt 4-Way to 7-Way RV and 4-Way Flat for 2016 Chevrolet Equinox
    I recommend the Curt Trailer Connector Adapter # C57672, 4-Way to 7-Way RV and 4-Way Flat. What I like about this is that it provides you the needed 7 way but extends out the existing 4 way making both available. Please note that while this will allow the 7 way to plug into vehicle it will still only support the lighting functions of the 4 way. If you want full functionality of the 7 way you will need the Universal Installation Kit for Trailer Brake Controller # ETBC7 as well. Please...
    view full answer...
  • Ready to Tow Setup For 2009 Jeep Wrangler Unlimited
    To be able to tow the trailer with a 7-way connector you are right that you will need to install a 4-way connector first if your 2009 Jeep Wrangler Unlimited does not come with a factory tow package. The Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # HM42635 will plug into your factory harness in your Jeep without factory tow package. The Curt Trailer Connector Adapter - 4-Way to 7-Way RV and 4-Way Flat # C57672 will be able to plug into your newly...
    view full answer...
  • Trailer Hitch and Wiring Recommendations for a 2019 BMW X3
    We do have some trailer hitch and wiring options for your 2019 BMW X3. For a hitch I recommend using the Draw-Tite Class III # 76226 as it fits all models of your X3. Then for wiring you'll need the T-One # TK77FR which tees in behind your tail lights and gives you a 4-Way for basic lighting. To add the correct 4-Way and 7-Way connectors we will need to determine the purpose of having those sockets. We can mount the sockets to our receiver using the Easy Mount Bracket # C58000, but you...
    view full answer...
  • Troubleshooting Overloaded Vehicle Harness On a 2015 Ford Transit T250
    That sounds correct to me. When you cut off the Curt T-Connector Vehicle Wiring Harness # C56327 converter box, it tried to pull all the power for the trailer circuits off the vehicle harness on your 2015 Ford Transit T250. It hopefully only damaged the fuses and not parts of the vehicle harness. Be sure to check the power wire that ran to the converter and see if the fuse was damaged or any of the harness is damaged as that would explain why it was not working when you recently tried to...
    view full answer...
  • Recommendations For Adding A Brake Controller To A 2020 Hyundai Palisade
    I will start by saying the Curt # C13427 hitch and the Curt # CU94FR wiring harness are definitely fits for your vehicle, so they are definitely a good place to start. However, getting the Curt Spectrum Trailer Brake Controller # C51170 up and running properly will require more than just 7 Way plug. The Curt 7 Way # C57672 will just piggyback off the 4 Flat and will not have any other function until more wire and circuit breakers are run. With that said, I recommend changing the Curt #...
    view full answer...
  • 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...
  • Parts Needed to Power Electric Brakes on Triple Towed Motorcycle Trailer
    You will need a little more than just the adapter but that is off to a good start. The Curt Trailer Connector Adapter # C57672 will connect to the 5th wheel 4-way so the signal power will carry over to the 7-way connector. However, you will still need to run wire to connect to the brake output circuit. Voltage drop is a definitely a concern so I recommend replacing the brake output wire on your entire setup with 6 gauge wire. So you will be replacing it starting at the brake controller...
    view full answer...
  • 7-Pin Trailer Light Wiring Harness for 2020 Jeep Cherokee Without Tow Package
    No Problem! For trailer lights you need the Tekonsha # 118727 4-pin wiring harness. This will get you trailer lighting, brake lights and turn signals. I have attached a link to that page, and a link to a video demonstration of installing the harness on a 2020 Cherokee. If the trailer you are towing does NOT have electric brakes or an onboard battery, but still uses a 7 pin connector, you need the Curt # C57672 4-way to 7-way adapter. This will give you a 4-way and 7-way jack on the back...
    view full answer...
  • Can Curt T-Connector C56329 and Curt 7-way Connector C57672 Use Same Power Wire To Battery?
    You will need to run two wires to the battery of your 2009 Ford Escape to install both the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56329 and Curt Trailer Connector Adapter - 4-Way to 7-Way # C57672. The reason for this is the power wire for the # C56329 uses a 15 amp fuse as it is just for powering the converter for the lights, where the black wire of the # C57672 is for the 12v trailer battery circuit which uses a 30/40 amp circuit breaker. Now...
    view full answer...
  • Which Vehicle Wiring Harness To Add 4 and 7 Way Connector To 2018 Chevy Equinox Diesel Non-Premier
    I would be happy to help! For your 2018 Chevrolet Equinox 1.6L diesel Non-Premier you will first need the Tekonsha T-one Vehicle Wiring Harness # 118750 which will be a plug and play installation to your factory connectors. Then to add a 7-way connector you will need either the # ETBC7 if you are planning on using a traditional trailer brake controller, or the option I recommend is the # ETBC7L with the Curt Echo Wireless Trailer Brake Controller # C51180 due to it requiring the least...
    view full answer...
  • 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.
    view full answer...
  • 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...
    view full answer...
  • Does Ground of 4-Way to 7-Way # C57672 Have to Be Ran for Just Taillight Functions
    If you were only planning on using the standard trailer taillight circuits with the # C57672 you would not need to run the extra ground wire although it wouldn't be a bad idea as it would add additional grounding to your trailer wiring. If you wanted to connect it you'd want to run it to the vehicle frame.
    view full answer...
  • Solution for Adapter for Vehicle 4-Way to Trailer 7-Way
    It sounds like you're looking for an adapter like the Curt Trailer Connector Adapter - 4-Way to 7-Way RV and 4-Way Flat # C57672. The Curt adapter should be mounted to your vehicle. This will have both the 4-way and 7-way connection. Since it sounds like you don't need the 12V power or brake output you can leave the additional connections disconnected. All you will need to do is plug in your existing 4-way to the 4-way plug on the adapter. Once this is done, the 7-way connector will have...
    view full answer...


< Previous
123. . .5



Do you have a question about this Trailer Wiring?


Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee John H
Expert Research:
John H
Employee Adam R
Expert Research:
Adam R
Employee Lindsey S
Edited by:
Lindsey S
Employee Joshua S
Video by:
Joshua S
Employee John S
Video by:
John S
Employee Thomas T
Video by:
Thomas T
Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
Video Edited:
Dustin K
Employee Cole B
Installed by:
Cole B
Employee Ryan G
Installed by:
Ryan G
Employee Wilson B
Updated by:
Wilson B
Employee Noah M
Updated by:
Noah M
Employee Conner L
Test Fit:
Conner L
Employee Bradley B
Test Fit:
Bradley B
Employee Kristina F
Written by:
Kristina F

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.