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  1. Custom Fit Vehicle Wiring
  2. CURT
  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 4 Flat
  6. No Converter
Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Item # C27BR
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Custom Fit Vehicle Wiring

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Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring. Powered converter reduces strain on wiring system and is made using SMT to ensure superior performance. 1-833-496-1390 to order CURT custom fit vehicle wiring part number C27BR or order online at Free expert support on all CURT products. Guaranteed Lowest Price and Fastest Shipping for Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (10)
  • Q & A (0)
  • Videos (1)
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  • Why etrailer?

CURT Custom Fit Vehicle Wiring - C27BR

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • No Converter
  • CURT

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring. Powered converter reduces strain on wiring system and is made using SMT to ensure superior performance.


  • Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights
    • Compatible with 5-pole, 6-pole and 7-pole adapters (sold separately)
  • Connects quickly and easily
    • Locate connection points behind tail lights
    • Plug in T-connector
    • Run hot lead to car battery
  • Includes a tail light converter to ensure that your vehicle's wiring matches that of your trailer
    • Powered module connects directly to battery to avoid overloading vehicle's electrical system
  • Constructed using surface-mount technology (SMT) for consistent, reliable performance
    • Maximizes trailer light yield and intensity while producing minimal heat
    • Ensures superior operation in rough road conditions
  • Comes with dust cap for 4-way flat connector


  • Maximum amperage:
    • Stop/turn lights: 3 amps per circuit
    • Tail lights: 6 amps per circuit
  • Limited 1-year warranty


This custom-fit T-connector plugs into your vehicle's wiring harness, which is located behind the driver's-side and passenger's-side tail lights. You will have to remove the tail light assemblies to access this harness. Once you've plugged in the T-connector, run the hot lead up to your car battery. Connect the lead to the included fuse holder, and then connect the fuse holder to the positive terminal on your battery.

Once installation is complete, the 4-way connector will be stowed in an out-of-the-way location within your cargo area.

It is recommended that you use a small amount of grease on all electrical connections - the plugs on your automobile and the 4-pole connector itself - to help prevent corrosion.

Powered Tail Light Converter with Surface-Mount Technology

A tail light converter is built into this T-connector. This converter is a circuit-protected, battery-powered unit that bypasses the electrical routes that are used by a basic wiring harness. As a result, there is virtually no draw on your tail light circuits.

Because most trailers run on a two-wire system - wherein the brake and turn signals are carried on one wire - the separate brake and turn signals from your vehicle's three-wire system need to be combined so they are compatible with the wiring system of the trailer. This converter combines the brake and turn signal functions of your automobile so that they run on one wire to properly activate your trailer's tail lights. Note: This will not affect how the tail lights on your vehicle operate.

Curt builds each tail light converter using surface-mount technology (SMT). This method of construction involves soldering electronic components directly to the surface of a printed circuit board. SMT eliminates the need for leads, which are used in older through-hole technology. The result is a circuit board that is smaller yet provides more routing area and that offers superior performance, reliability and durability.

Curt SMT Circuit Boards

Circuit boards constructed using SMT have been shown to perform better under rough conditions with excessive vibration than those made using the through-hole method. And where would vibration be more likely to occur than in towing applications? Curt converters also produce less heat, leading to increased durability and longer life. In addition, lower levels of resistance ensure better performance, especially for parts that operate at higher frequencies.

Each Curt circuit board is made using high-quality components that are pieced together in the most technologically savvy fashion, leading to greater predictability and reliability in functioning.

56473 CURT T-Connector Vehicle Wiring Harness with 4 Pole Trailer Connector

Installation Details C27BR Installation instructions

This Product Fits The Following Vehicles

Video of Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Review of CURT Custom Fit Vehicle Wiring - T-Connector Vehicle Wiring Harness 4-Pole Flat - C27BR

Hi, everybody. Andy here with And today, we're gonna take a look at this CURT T-connector vehicle wiring harness with four-pole flat trailer connector. Now, this is a custom fit part that is designed to fit the 2021 and newer Jeep Grand Cherokee L without the factory tow package and the 2022 and newer Jeep WL Grand Cherokee without the factory tow package. To confirm that this is gonna work for your vehicle, take advantage of our vehicle fit guide on our website, input the year, make and model for your vehicle and that will let you know if this will work for your vehicle. Now, this harness is going to provide a four-pole flat trailer connector at the back of your vehicle to power your trailer signal lights.

It is compatible with five-pole, six-pole, and seven-pole adapters. Of course, those are sold separately. And this does include a dust cap for this four-pole flat connector. It is removable and I do have it removed right now, but you would just simply slide this end over the connector. And then this will cover up those connection points, keeping them clean and free of dust, and debris, and moisture.

Now, the black box is a powered taillight converter. And this is going to ensure that your vehicle wiring matches that of your trailer. It connects directly to your vehicle's battery to avoid overloading the vehicle's electrical system, reducing strain on your vehicle's wiring system. Now, CURT builds each converter using surface-mount technology for consistent, reliable performance. It maximizes trailer light yield and intensity while producing minimal heat, ensuring superior operation in rough road conditions.

Now, this harness is designed to connect quickly and easily. The connections with the yellow wire will go to your driver's side and the connections with the green wire will go to the passenger side of your vehicle. Now, you will need to locate your vehicle's taillight wiring harness behind the driver's side and passenger side taillights. And then you will have to remove the taillight assemblies to access this harness. Then you will separate the taillight connectors, being careful not to break the locking tabs and insert these T-connector ends between the vehicle wiring connectors and lock them into place.

These T-connectors are custom fitted for your vehicle, so they are going to match up perfectly with the connection points on your vehicle. And they snap and lock together for a tight, secure fit. Now, once you have these plugged in, you will need to make a ground connection. And that is this white wire right here with a ring terminal. And it does come with a self-tapping screw. So, you can get this grounded to a suitable location, such as your vehicle's frame or crossmember and just make sure that the surface is clean and rust free. Then you will need to mount this converter box to a safe, out of the way location. And you can do that with another mounting screw that you might have on hand, or with this included double-sided adhesive tape, or with one of the many cable ties that is included with this kit. Next, you will need to run the hot lead to the vehicle battery and that's this short black wire that is coming out of the converter box. And this short black wire is going to get connected to one of the ends of this included bundle of black wire using one of the included butt connectors. And then the other end of this bundle will get routed to your vehicle's battery. And once you have this routed to the battery, you will take the fuse holder and connect one of the wires of this fuse holder with a second butt connector to the other end of this bundle of wire that you routed to the battery. And then the other half of this fuse holder will get a ring terminal that we have right here. And that ring terminal, once you attach it to this wire, will then connect to the positive post of your vehicle battery. It does come with a 10 amp fuse and it goes into this holder as I have it already in the holder. Then it has this cap to keep your fuse within, safe and protected. And it's a nice, tight fitting cap. So, that cap will not come off or become disconnected by itself. Now, you can secure any excess or slack in your wiring with the included cable ties and we have several here, as I mentioned, in this kit. So, you should have plenty cable ties to make sure that your wiring is nice, and tight and secure. And once the installation is complete, the four-way flat connector will be stowed in an out of the way location within your cargo area of your Jeep. When you're ready to use it, you can just simply run this out of your hatch and run it in between the weather stripping of your hatch door and the frame of your vehicle, making sure that this doesn't make contact with the the striker or anything like that. And then you can easily plug this into the wiring of your trailer. Now, the maximum amperage for the stop-turn lights is gonna be three amps per circuit. And for the taillights, six amps per circuit. Instructions are included. And it is also recommended that you use a small amount of dielectric grease on all of your electrical connections, like the plugs on your vehicle and the four-pole connector itself. And it is designed to help prevent electrical failures caused by corrosion and moisture. If that's something you would like to pick up and you don't already have that, I have included the item number on your screen for you. Just punch in that item number in the search field on our website and that will take you to that product. Well, that's gonna conclude our look today. I do hope that it was helpful for you. Again, my name is Andy. Thank you for joining me..

Customer Reviews

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - C27BR

Average Customer Rating:  5.0 out of 5 stars   (10 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring. Powered converter reduces strain on wiring system and is made using SMT to ensure superior performance.


Ordered a hitch and wiring harness for our Jeep Grand Cherokee from Robert over the phone. Our normal towing vehicle broke down and we were in a bind to get this installed for an upcoming trip. Paid extra for quick shipping and it arrived even faster than expected, in fact I was able to complete the installation in less than 24 hours from the time I ordered it from Robert. Fast professional customer service from Robert and etrailer! Thank you!

2022 Jeep Grand Cherokee WL – new body

I installed the hitch and rear wire harness, I still need to run the 12v supply. I am a retired technician that worked at the Chrysler Tech Center so I am very familiar with doing this type of work. The installation took 1 1/2 hours and had no issues, the hitch and harness are excellent quality and fit perfectly. It is a lot easier to install the wiring with the facia removed. I guess that if I had to complain, they should have a place to screw the wiring module and ground on the hitch itself. The delivery was fast and free and much cheaper than the dealership, I would highly recommend them. Thanks etrailer!


Products arrived correctly for my specific vehicle. Installation videos made it extremely easy to install.

2021 Jeep Grand Cherokee L

Plug and play for the lights. Worked as intended.


Easy to install.


Easy to install and great build quality




2021 Jeep Grand Cherokee L


See what our Experts say about this CURT Custom Fit Vehicle Wiring

  • Troubleshooting Error Codes on 2022 Jeep Grand Cherokee L After Installing Curt T-Connector Wiring
    If the Curt T-Connector Vehicle Wiring Harness # C27BR was installed correctly on your 2022 Jeep Grand Cherokee L you shouldn't be getting any of those lights. The only time you would see those lights is if the kit wasn't installed correctly or if the T-Connector is malfunctioning. The tees in this wiring kit let the OEM circuits flow directly through and basically just use those circuits as triggers for when to send power back to your trailer wiring. The trailer wiring is powered via...
    view full answer...
  • Trailer Hitch Receiver & Wiring For 2022 Jeep Grand Cherokee WL
    There is a trailer hitch receiver as well as a 4-way wiring harness that fit your 2022 Jeep Grand Cherokee WL; that said, we don't have any way to reference a VIN so you'll need to confirm if you do have the WL, which is the new model of '22 Grand Cherokee. The correct hitch and wiring harness for your Jeep are the following: - Curt Trailer Hitch Receiver # C24BR - Curt T-Connector Vehicle Wiring Harness # C27BR I did verify directly with the manufacturer for you that both the hitch...
    view full answer...
  • Difference Between Curt and Tekonsha Trailer Wiring that Fits 2021 Jeep Grand Cherokee L
    Both the Curt trailer wiring harness # C27BR and the Tekonsha T-One part # TK39VR are great options for trailer wiring that fits your 2021 Jeep Grand Cherokee L that does not have the factory tow package. Essentially they are the same thing designed by two different brands. I would go with the Curt though as we have great luck with the reliability of their kits.
    view full answer...

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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee David F
Test Fit:
David F
Employee Andy C
Installed by:
Andy C
Employee Schuyler H
Video by:
Schuyler H
Employee Sabrina W
Written by:
Sabrina W

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