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

Part Number: C57672
525 Reviews | 126 Questions
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$41.07
 Custom Fit Vehicle Wiring
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curt custom fit vehicle wiring adapters trailer connector adapter - 4-way to 7-way rv and flat
curt custom fit vehicle wiring 4 flat to 7 blade
curt custom fit vehicle wiring 4 flat to 7 blade
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curt custom fit vehicle wiring 4 flat to 7 blade c57672
curt custom fit vehicle wiring c57672
curt custom fit vehicle wiring adapters trailer connector adapter - 4-way to 7-way rv and flat
curt custom fit vehicle wiring c57672
curt custom fit vehicle wiring 4 flat to 7 blade
curt custom fit vehicle wiring adapters
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0 custom fit vehicle wiring curt adapters trailer connector adapter - 4-way to 7-way rv and flat
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Curt Trailer Connector Adapter - 4-Way to 7-Way RV and 4-Way Flat customer photo
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Curt Trailer Connector Adapter - 4-Way to 7-Way RV and 4-Way Flat customer photo
Curt Trailer Connector Adapter - 4-Way to 7-Way RV and 4-Way Flat customer photo
Curt Trailer Connector Adapter - 4-Way to 7-Way RV and 4-Way Flat customer photo
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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. 1-800-940-8924 to order CURT custom fit vehicle wiring part number C57672 or order online at etrailer.com. Free expert support on all CURT products. Great prices and Fastest Shipping for Curt Trailer Connector Adapter - 4-Way to 7-Way RV and 4-Way Flat. Custom Fit Vehicle Wiring reviews from real customers.
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CURT Custom Fit Vehicle Wiring - C57672

Highlights

  • Tow Multiple Trailer Types: 4-way to 7-way adapter adds both plug styles for easy hookups.
  • Expand Trailer Functions: Lets you add brake, reverse, or 12V power lines when needed.
  • Quick Plug-In Setup: 4-way connection converts instantly—no rewiring for basic lights.
  • Power Accessories: 12-gauge black wire supports 12V feed for trailer battery or gear.
  • Brake Controller Ready: Blue wire prepped for wired or wireless brake controller use.

Features to know about

Adds 7-Way Capability Without Rewiring: 4-Way to 7-Way Adapter

A lot of trailers use a 7-way plug, but many vehicles only have a 4-way. This adapter bridges that gap. It plugs right into your existing 4-flat and gives you a 7-way RV blade plus an extra 4-way outlet. That means your trailer lights—running, turn, and brake—work instantly, no splicing or rewiring needed.

Ready for Brake and Power Add-Ons: Extra Leads for Full Function

If you want to power trailer brakes or charge a trailer battery, this adapter already has the leads for it. The blue wire connects to a brake controller, the black wire runs to the battery for 12V power, and the yellow wire supports reverse lights. The white wire grounds to the frame for a solid connection. It’s a simple way to upgrade when you’re ready to go all-in with 7-way functions.

Works Great with Wireless Brake Controllers: Easy Echo Setup

For setups using the Curt Echo wireless controller, this adapter is a natural fit. You don’t need to run the blue brake wire since the Echo handles that through the 7-way. Just connect the 12V power line and ground, and you’re set. It’s one of the easiest paths to a clean wireless brake controller install.

Power You Can Count On: 12-Gauge Accessory Wire

The built-in 12-gauge power wire delivers reliable current for trailer accessories. When paired with a proper circuit breaker—like a 30- or 40-amp—it keeps your setup safe while running lights, charging a trailer battery, or powering accessories such as lift-assist bike racks. It’s built for consistent performance and simple hookup.

Specs

  • Image: Curt Trailer Connector Adapter C57672 wiring diagram showing color-coded connections between 4-way and 7-way trailer plug for power, brake, and reverse light circuits.

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

Similar to Hopkins HM47180 and Hopkins HM47200

Installation Details C57672 Installation instructions





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Customer Satisfaction Score:

Ratings & Reviews

4.7

525 reviews
5 Stars
(425)
4 Stars
(70)
3 Stars
(7)
2 Stars
(6)
1 Star
(17)
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by:
This is a solid unit, easy to install connecting to the 4way in the trailer side could be better in that it's a pigtail and not integrated into the actual body of the connector. However, if the body connector were to fail then you'd be stuck. This unit was installed on a 2023 RAM Pro Master Van 2500. This vehicle does not have tow package and aftermarket products like "Pilot" wired brake control units CANNOT be used in the factory wiring... $1900. dollar repair for wiring, and $1500 car rental while the van was in the shop for nearly 3 weeks. The CURT Inertia Bluetooth 7Way plug is the only safe option and connects to the CURT 7Way plug which was connected to the CURT Trailer wiring adapter for the internal van wiring, no taps splitters etc. were done just plug it in and provide the direct power to the battery which drives the inertia unit and provides additional power to the trailer where needed. CURT does a great job testing and etrailer.com videos for installation and information are what makes me come back over and over again. By far and no competition in this field for service, product availability, and shipping time. The additional wires available on the back of this unit were not used because an installer tried with the "pilot" at rental truck company and also tried to tap into the white and green tracer as well as the online misinformation stating other connections for a hardwire Brake control in the front of the van, DON"T DO IT...
by:
Easy to install but the 4 way wire harness just slides into the metal mount, where it also slides out of. Use of a few wire ties to hold it back to the main wire bundle solves that problem but for the price, you shouldnt have to do that.
Mike L. profile picture
Etrailer Expert

Mike L.

8/27/2026

I've used black RTV such as # LT37467 for that in the past, and it worked very well.

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!
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Roger profile picture

Roger

5/9/2025

I love it.

by:
Installed directly onto an aftermarket Curt hitch receiver, 2018 Nissan Frontier. Everything worked great.

I do have a complaint- not a huge deal: The additional 4-pin connector is meant to sit within a slot on the bracket, but there is nothing holding it there. I wound up using a long zip-tie around it and the body of the 7-pin plug to keep it in place.
by:
Simple to connect. Mounting bracket is a little bendy.
by:
Easy install. The 4 pin connector is not great. It's a notch and the pin falls off when I try to plug in a 4 pin trailer plug. The 4 pin notch is a bad design to me.
by:
Gave a 4 because I haven't installed product yet. Packaged well and easy instructions. Curt has a good reputation and I trust it will perform as described.
by:
This was very plug and play. As always mounting is usually the tricky part from one install to another from my experience. I was able to mount mine on my Jeeps factory bumper via some larger holes that were in the bottom of the bumper. I used some fender washers an a metal backing plate for my particular install.
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Heather A. profile picture
Etrailer Expert

Heather A.

2/19/2025

Hey James! The bracket looks great! The photo really helps other customers if the same Jeep as you. Thanks for taking the time to send it.

by:
Installed Redarc brake controller in a Subaru Outback. Instruction clear, and for advanced DIY a two hour job to complete wiring to 7 pin connector.
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.
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by:
It worked the first time. The fuse sockets on the panel aren't numbered and the photo with the arrows pointing to the sockets on the fuse panel could use some enlargement. However two of the sockets in the panel didn't have contact tabs in them so I knew where not to plug the fuses in.
by:
I just wish the shipping did now take so long. I had to cancel a trip because of late arrival of the product.
by:
The pictures show the harness 6 months after installation. Due to steep driveways and my wife’s driving; it got bent from its 90° angle. Despite the damage, the harness still works correctly and reliably. 10/10 would buy again…may have to if wife keeps driving.
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by:
Easily mounted on the platform on the hitch.
Wiring was easily.
by:
works great
by:
Should work great
by:
let you know when I install it. just came in. looks right
by:
Great quality, easy install!
by:
Your company makes everything easy to install.
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.
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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.
Robert profile picture

Robert

7/2/2025

After finding good wire path up to engine bay, it went smoothly. Great to have noth 4 and 7 pole connections available.

by:
Nice sealed unit
by:
Very simple and straight forward to install.
by:
Simple install with excellent instructions.
by:
On time and the Customer Service is the best I have ever seen!
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See what our Experts say about this CURT Custom Fit Vehicle Wiring

Do you have a question about this Custom Fit Vehicle Wiring?
  • My Vehicle has a 4-Pin Trailer Plug, but Trailer has 7-Pin Trailer Plug
    If you just need a 4-pin to 7-pin trailer wiring adapter, then you can use part # C57672. This will plug into the 4-pin trailer connector on your brother's vehicle and give him the 7-pin socket for the trailer. Keep in mind, this will only give you trailer light functions. If your trailer has a 7-pin connector, then it likely has electric trailer brakes and an onboard battery. If you want a fully functioning 7-way trailer socket on his vehicle, then the installation will be a bit more...
    view full answer...
  • How to Install a Universal 7-Way Wiring Harness on a 2023 Ford F-150
    Hey Brian. The Curt Trailer Connector Adapter item # C57672 is going to install in the same way on your 2023 F-150 as it did on the video we made for a 2021 F-150. Those trucks are the same generation but I can not guarantee the wiring colors are going to match up. Ford had to cut some corners on wiring harnesses during Covid and basically take what they could get from their suppliers. To be safe before you do any cutting or splicing, I recommend checking the functions of the blue and...
    view full answer...
  • Adding 7-Way Connector to 2020 Hyundai Palisade
    We definitely have what you need to equip your 2020 Hyundai Palisade with a 7-Way connector, however there isn't a single part number available for this vehicle to accomplish this. You will instead need to start by adding a 4-Way harness (if there's not one already present). For this the Curt T-Connector Vehicle Wiring Harness # CU94FR will work perfectly. This custom harness will plug right into an existing port behind the Palisade's rear bumper on the driver's side. I have attached...
    view full answer...
  • Recommended 7-Way Wiring And Wireless Brake Controller For A 2022 Toyota Highlander
    Hi Vijay, Since you're wanting to go with a wireless brake controller you can use the Curt Trailer Connector Adapter # C57672 you were looking at and just cap off both the yellow and blue wires with some electrical tape. These can be saved for use later on if you want a hardwired brake controller or have a boat trailer with a reverse lock out solenoid. You'll need to pick up some 10awg wire # 10-1-1 to run from the black wire up to the battery and a 40 amp circuit breaker # 9510 inline...
    view full answer...
  • How Do I Connect a Trailer with a 7 Way Plug to a Vehicle with a 4 Way Flat?
    Hi Ron, you can definitely do that, but the right solution depends on whether your trailer uses all seven functions or just the basic lighting. If you only need the running lights, brake lights, and turn signals, the Curt Trailer Connector Adapter, part # C57672, is a great option. Your vehicle's 4 way flat plugs into the adapter, and your trailer's 7 way plugs into the other side. By grounding the adapter, you'll have the basic 4 way lighting functions without needing to wire in the...
    view full answer...
  • Does the Curt Trailer Connector Adapter w/ Backup Alarm Include All Necessary Wiring?
    No, it does not Julia and it's missing the circuit breakers too. To install the Curt Trailer Connector Adapter with Backup Alarm item # C57102, you'll also need the Wiring Kit for 2, 4, 6, and 8 Brake Electric Trailer Brake Controllers item # 5506. Please note that any time your Jeep 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...
    view full answer...
  • Can Curt 4-Way to 7-Way Provide Power for Saris Door County Bike Rack
    Hey Nancy, yes the 4-way to 7-way adapter part # C57672 would work for you. The 12 volt accessory circuit of the 7-way would provide the power your Saris Door County part # SAR42RR needs to raise and lower as well as power the taillights. How do you like the rack so far?
    view full answer...
  • 4-Way and 7-Way Recommendation for 2015 Toyota Sienna LE
    Hey Brad, the Tekonsha 4-way kit part # 118648 is the correct fit and best option for your 2015 Toyota Sienna LE. Then for a 7-way adapter the part # C57672 that you referenced would be exactly what you'd want as well. Does the trailer have brakes? I noticed you also referenced the # 37185 7-way adapter which is also a really great option just like the Curt but it does look like it costs more so it wouldn't be what I would go with if I were you.
    view full answer...
  • 2024 Ford Ranger Battery Management System and Auto Start Stop Issues After Curt Trailer Wiring
    Hi William, great question. It does not sound like the Curt wiring itself damaged anything, and while I have not seen widespread reports specifically tied to the Curt # C57672 and # C55152 causing permanent issues on the 2024 Ranger, we absolutely have seen newer Ford vehicles behave this way when the battery monitoring sensor or battery connections are disturbed during accessory installations. The Ranger uses a very sensitive battery management system tied into the auto start and stop...
    view full answer...
  • 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!
    view full answer...
  • Will Adding Optronics LED Backup Light to Kayak Trailer Require Rewiring the Trailer
    It sounds like you are wanting to replace your incandescent backup lights on your kayak trailer with LED lights like the Optronics LED Backup Light for Trucks or Trailers # BUL52CB. If that is the case, all you will need to do is replace the current lights with the LED lights. The # BUL52CB accept the industry standard 2-prong plug like the 2-Wire Pigtail for Optronics Backup and Utility Trailer Lights - 2-Prong PL-3 Plug # A45CB. If you do not have existing lights, then you will have...
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  • 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...
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  • Complete Flat Tow Package For 2023 GMC Canyon AT4
    Hello Wade, thanks for reaching out. We can absolutely provide all the parts you need to flat tow your 2023 GMC Canyon AT4. Here is what I recommend: - etrailer Invisible Base Plate Kit - Removable Arms # e97FV - etrailer XHD Non-Binding Tow Bar - RV Mount - 2" Hitch - 10,500 lbs # e94ZR - Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles - 7-Way to 6-Way Coiled Adapter Cord # RM-15267 - Roadmaster Battery Disconnect for Towed Vehicle w/ Flat Tow Brake System - Gas Only # RM-766 -...
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  • Adding 7-way To 2019 Ford Edge ST With Factory 4-Flat
    Hello Kyle, thanks for reaching out. The Curt # C57672 will plug in to your current 4-flat connector, but if you are planning to pull a trailer with a 7-way and trailer brakes, additional wiring will need to be required. We actually custom make our own install kit for this depending on what kind of brake controller you will be using: - Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires # ETBC7 (for standard in-cab controllers) - 7-Way RV...
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  • Testing Prodigy P3 Brake Controller Power Output on 2011 Nissan Pathfinder
    The Tekonsha Prodigy P3 # 90195 is a great fit for your 2011 Nissan Pathfinder using the wiring harness # 3050-P. There is no additional relay or anything required. Since you know there is power getting to the controller the best way to test if power going out from the controller is to test the blue brake controller output wire. You can do this behind the harness or you can do this at the 5 o'clock pin of your 7-way trailer connector using a circuit tester like # PTW2993. Because...
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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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  • 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....
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  • Options for Mounting a 7-Way Connector on a 2023 Grand Cherokee L
    You're not really in a good spot to mount the Curt Trailer Connector Adapter item # C57672 to the Curt Hitch item # C96NR on a 2023 Grand Cherokee L. The Curt Easy Mount Bracket item # C58000 should not have been used for that set up though. There was definitely no need to drill into your hitch to mount it either. It's advertised clearly as a no-drill option. The competitor you're talking about is Mopar and their pn 82219040AA hitch has a cut out for a 7-way to be imbedded inside of it....
    view full answer...
  • Can I Replace My Trailer’s 4-Flat Plug With a 7-Way Plug for My 2022 Toyota Highlander?
    Hello Eric, Thanks for writing in, I'm glad you found us. Yes, you absolutely can replace the trailer’s 4-flat connector with a 7-way plug and only wire up the 4 existing functions if you want to stop using an adapter on your 2022 Toyota Highlander. The 4 wires would still handle your basic trailer lighting functions like running lights, brake lights, and turn signals, and the unused terminals on the 7-way plug would simply remain inactive until needed later. For that setup, I’d recommend...
    view full answer...
  • Flat Tow Setup for 2013 Jeep Wrangler MOAB With Factory Steel Bumper
    Hey Jason! Since you have the MOAB edition you actually need the Blue Ox Base Plate Kit # BX1133. It was specifically designed for your bumper. For wiring you need the Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles - 7-Way to 6-Way Coiled Adapter Cord # RM-15267. There are a few different ways to handle the 6-way connector on your Cruiserlift. Is there a particular reason you have a 6-way on there now? If not, I recommend swapping that connector out with a 7-way # C57672 which...
    view full answer...
  • What Do I Need To Be Able To Install a 7-way On My 2002 Ford Van
    Hey, Kennie. I can definitely help you out with this. The Curt harness part # C55344 is a custom harness for your 2002 Ford Van E-150. It looks like the other part number you had in question is a part number used on another site unrelated to us. I can't vouch and say yes, you will be getting everything that you need by ordering that part number. Based off that part number, I'm assuming that you're wanting to have a 7-way on the back of your van. Part # ETBC7 will plug into the 4-flat...
    view full answer...
  • What Gauge Wire To Use For Power Wire On 7-Way?
    Hello Vincent, thanks for reaching out. Some 14 gauge wire would be acceptable for the 12v power wire. Generally, we would use a 30 amp circuit breaker for this. To prevent any backfeed you can install a diode like part # RM-690. I hope this helps. Leave a reply with any other questions or comments and I will get back to you.
    view full answer...
  • Is Smaller 12 Volt Wire on Curt 4-Way to 7-Way Adapter an Issue
    Hi Tom, That's a good question but there will not be any issues at all with the 12 volt wire of the Curt Trailer Connector Adapter - 4-Way to 7-Way RV and 4-Way Flat # C57672. This is a 12 gauge wire and won't cause any issues for your wiring.
    view full answer...
  • Do I Need to Run the Blue Wire on the Curt Trailer Connector Adapter C57672 When Using a Curt Echo?
    If by trailer brake circuit you mean the blue brake controller wire, the answer is no. If you're using a Curt Echo item # C51180 you don't even need to run the blue wire on the Curt Trailer Connector Adapter item # C57672. It would be wired to the cab and connected to a traditional brake controller.
    view full answer...


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