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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
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Wiring C57672 - Plug and Lead - Curt
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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. Lowest Prices for the best 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 800-298-8924 for expert service.
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  • Reviews (33)
  • Q & A (23)
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  • Used (1)
  • Why etrailer?

Curt Wiring - C57672

  • Wiring Adapters
  • Multi-Function Adapter
  • 7 Blade
  • 4 Flat
  • 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 Reviews

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

Average Customer Rating:  4.8 out of 5 stars   (32 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.

- C57672
by:

Great price 652909



- C57672
by:

Worked as it should 883733



- C57672
by:

nice product 878051



- C57672
by:

874513



- C57672
by:

Good looking piece, quality material. 872599



- C57672
by:

870528



- C57672
by: 08/28/2020

This product worked great for me. I had a little trouble fitting it to my Toyota Sienna (it would have helped if the 4 pin flat connector could be located on either side of the 7 pin round connector), but functionally I’ve had no issues. One weakness I could see is the included butt connectors are not heat shrink type so they’re not weatherproof. This could lead to corrosion in the wiring eventually. Otherwise good product! 870433



- C57672
by:

868579



- C57672
by:

Exactly what i needed at a very competitive price and delivered ahead of schedule! 868078



- C57672
by: 08/17/2020

Easy to install and videos were helpful 863585



- C57672
by:

Perfect option for 2013 GL 450. Easy installation, no splicing required, flexibility for custom fitment, and recommended by etrailer experts 853381



- C57672
by:

I had mistakenly ordered a trailer connector for my pickup thinking it was prewired for it - my truck wasn't. I ordered this kit which worked perfect and returned the first one with no hassle for a full refund minus shipping. The go to people to order from! 828518



- C57672
by:

Very pleased with this product. Works exactly as I needed 811226



- C57672
by:

The customer service I received was second to none. William was very knowledgeable in ever aspect of my purchase. Hitch is of high quality and good appearance. Will definitely buy their again. 815654



- C57672
by:

Excellent customer service and prompt s hipping. 812244



- C57672
by:

Great 808025



- C57672
by:

Quality product with easy installation. Used to connect to the four prong on 2015 Toyota Highlander for RV trailer lights. 806300



- C57672
by:

great upgrade. back of plug larger than original had to modify mounting. great price, shipping and service. 791732



- C57672
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. 783284



- C57672
by:

Easy install also just had to find where I wanted to mount it that took the longest 779798



- C57672
by:

Bought for a 1998 GMC K2500 pickup. Needed wiring hookups for both my 4 wire ten foot trailer and also my 16 foot trailer with round hookup. Fit my wiring perfectly, had it installed in 30 minutes. Had it for a year now and have had no problems, still working great. The videos and instructions from etrailer are great, makes the job very simple. 763767



- C57672
by:

Exactly what I expected in a timely manner and well priced. Thank you!!! 763463



- C57672
by:

First off the shipping and packaging is awesome. I cannot tell you how many times we get damage/scratched or mangled parts delivered to us. The part is everything we needed to replace the old rotted out connector. The part quality is top notch. We are going to replace all of are older connectors to the C576672. 756723



- C57672
by:

Great product, good instructions. 726041



- C57672
by:

great product great service 697014


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Ask the Experts about this Curt Wiring

  • 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...
  • 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...
    view full answer...
  • 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...
  • Brake Controller Installation on 2018 Toyota Highlander
    You'll need to choose a brake controller and the # ETBC7 brake controller installation kit. The install kit includes an adapter to convert the 4 pole you recently installed to a 7-way. I'd recommend a proportional controller like the Tekonsha Primus, part # TK90160. Your Highlander is very sensitive to power feeding back into the brake lamp circuit, so instead of the pigtail included with the Primus, you'd need to use the # 7865 which has a diode installed on the brake lamp circuit to...
    view full answer...
  • Do the Blue, Yellow, and Black Wires Need To Be Run On the Curt Trailer Connector Adapter C57672
    For starters, we do not offer products through Amazon as they are a competitor of ours. However, I can offer you the Curt Trailer Connector Adapter part # C57672 which will work on your 1968 Ford F-150 if you have an existing 4-way trailer connector. The additional black, yellow, and blue wires do not need to be attached in order for the trailer light to work but you will need to ground the white wire to your frame. The black wire is to charge a battery on the trailer and you will need...
    view full answer...
  • How To Convert a 4-Way to a 7 and 4-Way On a 2013 Nissan Xterra
    In order to convert the 4-way trailer connector on a 2013 Nissan Xterra to a 7-way trailer connector with 4-way you will want to use the Curt Trailer Connector Adapter part # C57672. The Curt adapter will plug into your existing 4-way and then provide connection points for both a 4 and 7-way trailer connector. In order to complete the installation, you will need to ground the white wire and tie off the yellow wire. If the trailer has brakes you will need to run the blue wire into the cab...
    view full answer...
  • How to Use a 4-Pin to 7-way Trailer Connector Such as C57672
    The # C57672 will allow you to convert an existing 4 pin connector on a vehicle and allow it tow a trailer that has a 7-way. By attaching the mounting bracket to the underside of the bumper or chassis of the tow vehicle, plugging the 4 pin on the adapter into the existing 4 pin connector on the vehicle and attaching the white ground wire to the tow vehicle's frame or chassis, you'll be able to activate the lighting functions on your trailer. There will be three remaining wires on the adapter...
    view full answer...
  • 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...
  • Cost Effective Wiring To Install 7-Way For Curt Echo Controller on 2008 BMW X5 With Battery in Trunk
    The Curt Trailer Connector Adapter part # C57672 can certainly be used to install a 7-Way on the 2008 BMW X5 to use the Curt Echo Wireless Brake Controller part # C51180 instead of the kit part #ETBC7L. I recommend to use the Curt trailer connector part # C57672 and the Power Wire Kit for Electric Trailer Brake Controllers part # BRK-ELECKIT because it has a shorter amount (10 feet) of 12 gauge wire since your battery is in rear cargo area. This kit also comes with all of the components...
    view full answer...
  • Can 4 Way and 7 Way of Curt Trailer Connector Adapter # C57672 be Used at Same Time
    Yes, the 4-way and the 7-way of the Curt Trailer Connector Adapter # C57672 that you referenced can be used at the same time as they are both active at all times.
    view full answer...
  • Can You Extend the Ground Wire When Installing Trailer Wiring?
    The Curt Trailer Connector # C57672 should be grounded to any paint and debris free surface, preferably the vehicle frame; since the hitch is painted, it's not going to provide the best ground source for your 7 way connection. You can extend the ground and run it to a more convenient spot on the vehicle and you'll want to use a ring terminal like # 44-5356A (similar to the one found on the end of the ground wire of the C57672). If you need additional wiring, you can use # 10-1-1 which is...
    view full answer...
  • Easy to Install Brake Controller Recommendation for 2009 Ford Escape
    The easiest to install brake controller to use with the 4-way to 7-way adapter # C57672 is the Curt Echo Mobile controller part # C51180 which would require you to only complete the black wires circuit of the adapter and you'd be set. You'd need to run the black wire to the positive post of your battery with 10 gauge wire like part # 10-1-1 (sold by foot) through a breaker like # 9510 and you'd be set. What makes the Echo so easy is the fact that all you have to do is plug it into a...
    view full answer...
  • 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...
    view full answer...
  • How to Install 7-Way Connector on 2019 Subaru Outback Wagon
    We have exactly what you need to install a 7-Way connector on your new 2019 Subaru Outback Wagon so you can connect with the 7-Way on your trailer. You will need to start with a 4-Way harness and for this the Tekonsha T-One # 118467 will work perfectly. This custom harness will plug right into a factory port behind the driver's side trim panel for a completely "plug-and-play" installation. I have attached an installation video that you can even use for reference. Then once you have...
    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 Tekonsha T-One Vehicle Wiring Harness # 118784 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...
  • Does Blue Ox Patriot 3 Portable Braking System Require Connection To Vehicle Battery
    The Blue Ox Patriot 3 Radio Frequency, Portable Braking System - Proportional # BRK2019 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...
    view full answer...
  • 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...
  • 7-Way Trailer Connector for 2019 Mercedes-Benz Sprinter 2500
    Since there's not currently any trailer wiring on your 2019 Mercedes Sprinter 2500 you will need to start by adding a 4-Way harness. For this the Tekonsha T-One Vehicle Wiring Harness # 118649 will work perfectly. The custom harness will plug into ports behind the tail lights and receive power by running a hot lead up to the battery (this takes the strain off the Sprinter's factory tail light wiring). I have attached an installation video below that you can use for reference. Once...
    view full answer...
  • Parts Needed to Install 7-Way Wiring on a 2014 Audi Q5
    While there are no plug and play type 7-Way connectors for your 2014 Audi Q5, we still have the parts you need to get a 7-Way installed so you can tow your trailer. To start off you need the 4-Way and for that I recommend going with the Tekonsha ModuLite # 119190KIT or the Tekonsha ZCI # 119250KIT. The ModuLite is a standard splice-in type of installation while the ZCI uses special connectors that clip over your OEM wiring and prevent you from having to cut into any OEM wiring. Both...
    view full answer...
  • Can I Use Both The 7-Way and 4-Way At The Same Time?
    I have a solution for you, but you won't be able to use both the 7 way and 4 way plugs on the Hopkins # HM40975-11998 at the same time because the cover flaps do not allow for both to be open simultaneously. In order to plug both your 7 way and 4 way into the same plug you would need to use the Curt Trailer Connector Adapter # C57672 , which has the plugs side by side with dust caps that flip up to allow you to connect your plugs as desired. If you don't already have a wiring harness...
    view full answer...
  • Pop up trailer brake light and turn signal on right side not working
    I recommend checking the fuses under your dash. Some vehicles will have separate fuses for each function. My uncle had the same issue. I advised him to check the fuses first and he determined that he had a fuse blown. If your fuses are not the issue then check your 7 pole plug on the back of your Tacoma again. Have someone run through all the functions and test each one. You may be getting power to the plug but each function is going to be separate. If your determine that some of your functions...
    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...
    view full answer...
  • Trailer 7-Way to Car 4-Way Adapter Plug
    Yes, I have a solution for you. You can use the Curt # C57672 7-way to 4-way adapter. Your 4-way plugs into the back of it and wiring is included for additional connections. These are usually for trailers that have a 7-way plug but only need lighting. I have included a link to this product, and a link to a video that explains the connections and install. This product would be good for trailers that do not require a 12v charging line or electric trailer brakes. If you want to pull...
    view full answer...

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Info for this part was:

Expert Research:
Mike L
Expert Research:
Jameson C
Expert Research:
John H
Expert Research:
Adam R
Edited by:
Lindsey S
Installed by:
Cole B
Test Fit:
Conner L
Written by:
Kristina F
Updated by:
Noah M

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