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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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Curt Wiring Adapters - C57672
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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 800-298-1624 for expert service.
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  • Reviews (102)
  • Q & A (43)
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  • 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   (102 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:

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.



- C57672
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.



- C57672
by:

Installed on my 2011 F150, part worked great as advertised on install. The 4flat adapter was easy and obviously ground too. However, the Ford truck has the wiring harness for the rear components sitting about 12”-16” away from where you would realistically want the 7 way mount to sit. I’m sure many other vehicles are this far away as well. Therefore to get to the remaining 3 wires I had to add in another roughly 8” of wire to each introducing some extra connectors and more areas for failure. Not too big of a deal but I would say for this parts blue, black, and yellow cord you should make them another foot longer that way they seamlessly work on any vehicle and the buyer just has to zip tie the excess out of the way on installation. Wouldn’t cost y’all much but would save time and effort for the customer. Otherwise great part, easy install, and good install videos as well



- C57672
by:

Instructions have you tearing apart the cargo part of your 2021 Sienna (I have an AWD model) when the connector is easily accessible under the spare tire! Installation was easy once I found this out from another review!



- C57672
by:

really fast shipping was as stated . installed in less than 20 min. very happy would recommend them for any of your hitch needs.



- C57672
by:

Needs heat shrink connector's so they are water tight seeing they are under truck



- C57672
by:

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!



- 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.



- C57672
by:

Used this connector adapter on a previous vehicle and will now install it on my current one. Easy to install and performed as required. Instructions were easy to follow, too.



- C57672
by:

Shipped quicker than expected, fit was tight but right.



- C57672
by:

Super easy to install! Works perfectly!



- C57672
by:

uniquely above most online ordering, customer support I've experienced.



- 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!



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- C57672
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It was an easy installation



- C57672
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- C57672
by:

Easy to work with and got product when promised.



- C57672
by:

Worked beautifully.



- C57672
by:

does what it is made to do



- C57672
by:

Super quick shipping and part was as advertised, Thank You



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- C57672
by:

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



- C57672
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Show More Reviews

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...
  • 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...
  • Replacement 7 Way Wiring Harness For Vehicle And Trailer
    If you could provide me with the year, make, and model of you vehicle, then I could see if there is a direct fit 7 way harness that is compatible. Most passenger vehicles come with a pre-installed 4 way flat connection that require a 7 way to 4 way kit, such as Curt Trailer Connector Adapter # C57672. Or if you already have the 7 way wires at the back of your vehicle then you can use 7-Way Super Sealed Connector w/9' Cable Car End # 50-87-009 to wire in the 7 way connector. If you need...
    view full answer...
    Image 1 for
  • 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...
  • 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...
  • Does 2009 Lincoln Navigator Add a 7-Way for Brake Controller
    If your 2009 Lincoln Navigator does not have the factory 7-way, then it should have the factory 4-flat at the rear, which will allow you to add a 7-way. What you will need to add is the Trailer Connector Adapter - 4-Way to 7-Way RV and 4-Way Flat # C57672. This will allow for you to install a brake controller, the Draw-Tite I-Command Trailer Brake Controller # 5535 with Plug-In Wiring Adapter # 3035-P.
    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...
  • 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...
  • 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
  • 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 # 119147KIT. 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...
  • 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...
  • 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...
    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 Curt T-Connector And Curt 4-way and 7-way Connector Be Powered From The Same Wire?
    I have another option for you, but the Curt T-Connector # C56369 and Curt 7-way Connector # C57672 for your 2019 Jeep Compass cannot be powered by the same wire to the battery. The reason for this is the # C56369 requires you to use the included 10 amp fuse. Using a 30 or 40 amp circuit breaker would overload the module. While it is a little inconvenient, you will need to run two separate power wires. Instead of using the # C57672 I recommend the # ETBC7 which has the same style 4-way...
    view full answer...
  • 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...
  • 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...
  • 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...
  • 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...
  • Parts Needed to Set Up a 2008 Chevy Colorado With an Electric Brake Controller
    I can definitely get some parts recommended to set your 2008 Chevy Colorado up with a brake controller. First, you will need to start with a 4 Flat if you do not already have one. If you do not, the Tekonsha # 118301 will be a plug and play harness that will take no time to get installed. To get up to the 7 Way, it will need to piggyback off of the 4 Flat, so it is definitely needed. Next will be the Universal Installation Kit for Trailer Brake Controllers # ETBC7. This will include...
    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 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...
  • 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...
  • 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...
  • How to Add 7 Way Plug for 2016 Honda Pilot
    In order to complete the installation of the Curt 4/7 way connector # C57672 you will need to finish connecting the black, blue, white and yellow wires on that connector to give you a working 7 way. The issue here is that you've already got all these wires run for you, and the point of the # 3070-P adapter is that it allows you to tap into the wiring. Without utilizing the factory wiring for your 7 way, which you won't be when installing the Curt # C57672, you will need to hard-wire in...
    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...
  • 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...
  • Why is 12 Gauge Wire Used in ETBC7L Kit Instead of 10 Gauge?
    The 7-Way RV Upgrade Kit for Trailer Brake Controller Installation - 12 Gauge Wires # ETBC7L comes with the 30 amp circuit breaker and 20 feet of 12 gauge wire. For a run over 20 feet, I do recommend updating the wiring to 10 gauge using # 10-1-1 sold by the foot and using the 40 amp circuit breaker # 9510 instead. You can still use the Curt Trailer Connector Adapter - 4-Way to 7-Way RV and 4-Way Flat # C57672 for the connector and this will upgrade your amperage capacity. The 12...
    view full answer...

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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 Jacob T
Video Edited:
Jacob T
Employee Cole B
Installed by:
Cole B
Employee Conner L
Test Fit:
Conner L
Employee Kristina F
Written by:
Kristina F
Employee Noah M
Updated by:
Noah M

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