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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 # C56216
Our Price: $54.44
You Save: 32%
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. 1-800-496-5010 to order CURT custom fit vehicle wiring part number C56216 or order online at Free expert support on all CURT products. Great prices 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 (15)
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CURT Custom Fit Vehicle Wiring - C56216

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • 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 in rear cargo area
    • Plug in T-connector
    • Run hot lead to car battery
  • Includes a tail light converter that 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 in your rear cargo area. You will have to remove the rear scuff panel and the driver's side interior trim panel 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.

56216 Curt T-Connector - Surface Mount Technology - 4 Wire

Installation Details C56216 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

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 Curt Custom Fit Vehicle Wiring - Trailer Hitch Wiring - C56216 Review

Today, we're going to be taking a look a the Curt T-Connector Vehicle Wiring and Harness with the four pull flat trailer connector. This product is going to fit certain years of the Buick Encore and Chevrolet Trax. It's going to provide a four way flat trailer connector at the back of your vehicle to power your trailer's signal lights. The unit is compatible with five pull, six pull, and seven pull adapters. Adapters are sold separately. It's going to come with a dust cap for the four way flat connector to cover up the connection points when the plugs not being used. The black box on the unit, this is going to be the included tail light converter.

This is going to ensure that the vehicle's wiring matches that of the trailer's so it's going to help avoid overloading the vehicle's electrical system. It's going to connect directly to the battery through the wiring. It's going to be constructed using surface mount technology which is going to offer consistent, reliable performance. What that does is it maximizes the trailer light yield and intensity while producing minimal heat and it's going to ensure superior operation in rough road conditions. Another benefit of this system is that it's going to connect quickly and easily.

All you have to do is locate the connection points in the rear cargo area. You can see here that you're going to have to two sets of connectors. The set with the white, yellow brown and red wiring. That's going to go to the driver's side. The set with the green wiring is going to go to the passenger side. These plugs are going to be perfect matches with the plugs on the vehicles.

They're going to push together, snap lock together which is going to offer a nice, secure fit. It's going to come with your detailed installation and instructions. Those instructions are going to indicate exactly where those connection points are and it's going to walk you through the installation process step-by-step. It's going to come with wiring diagrams too. That way you can make all the connections appropriately and correctly. Once you have your connectors plugged in, you'll need to make your ground connection.

It's going to be your white wire with the ring terminal attached to it. Get it grounded in a nice, clean metal surface with the included grounding screw. Then, you'll need to mount the converter box to a nice, clean, out of the way location using the provided double-sided adhesive tape. Once you have that done, you can run the hot lead to the vehicle battery. The hot lead's going to be the black wire coming out of the converter box. This is going to get connected to the bundle of black wires with one of the included butt connectors. The other end of the black wire runs to the vehicle battery. That gets another butt connector attached to it and then connected to 1/2 of the fuse holder. The other half of the fuse holder gets the ring terminal attached to it and that gets connected to the positive post of the vehicle battery. Your ten amp fuse is included. It goes right here in the fuse holder. It's got the fuse cap to keep it safe and secure. You can secure any excess or slack in the wiring with the provided zip ties. Once your install is complete, the four way connectors are going to be stowed in an out of the way location within your cargo area. Plenty of wiring that you can pull out when you need it and then you can tuck it back in there and hide it when it's not being used. When it comes to the maximum amperage for the stop and turn lights, we're looking at three amps per circuit. For the tail lights, we're looking at six amps per circuit. We also recommend that you use a small amount of dielectric grease in all your electrical connections like the plugs on the vehicle and the four pull connector itself. That grease is really going to help protect those connection points from rusting corrosion. That is sold separately so if you need some, you can find it right here at That's going to do it for today's look at the Curt T-Connector Vehicle Wiring and Harness. Again, this product is going to fit certain years of the Buick Encore and Chevrolet Trax.

Customer Satisfaction Score:

Customer Reviews

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - C56216

Average Customer Rating:  4.7 out of 5 stars   (15 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.

2014 Buick Encore

This receiver is great! It was easy to install and worked well (wiring and ball mount inclusive). I bought the Encore instead of a truck hoping I could still use it for chores and have a better riding vehicle and thanks to e.trailer and Curt it works for me. Than you!

Terry K - 09/19/2016

2016 Buick Encore

Excellent instructions accurate fit easy installation
Hardest part was running the power wire from the battery through the firewall wire harness and under the drivers side door sill plastic to the back of the car. Rest of wiring harness was plug and play.
Well done


The service was great. I go into a fix where I needed the product overnight. It was a little expensive, but the service folks made it happen.

The product was basically as advertised. Easy enough to install once you get it figured out.

Most everything is done through the rear hatch. Remove all the flooring. Then remove both side panels to access the back of both tail lights. The toughest parts were as follows. 1. Disengaging the connector from the tail light. Take a flat screwdriver and insert it on the taillight side of the connector, and pull the two apart. It almost takes two people. 2. The other was routing the battery lead to the front of the vehicle. I routed it forward to the driver side rocker, then through the rocker, then across the front wheel shroud, then briefly through the frame rail, and then up to the battery. I used a wire feed to pull the wire through the length of the rocker.


Install was fairly easy and straightforward. Instructions and video were very helpful. Hardest part was getting the wire through the firewall to the battery but everything works great, no issues after a year of install.

2015 Buick Encore

I was very happy with this purchase but the dealer that installed it said the left & right signals were wrong. When they turned on the left signal in the vehicle the right came on and same for the left the right came on, the wires were reversed. They also said they were disappointed they has to run full length to get to the battery for the hot wire. Well it works GREAT now. Thanks GREAT product.


Real good customer service and fast shipping. Everything fit like a glove and was easy to install. Would recommend.

Its been a year and Ive had no issues. Everything works great.
Todd - 02/21/2017


I just used it for the first time this morning after having some one install it, I am not very handy. pretty easy install according to them. Everything worked as it should and it towed the small trailer I needed it to perfectly.


Easy to follow instructions and simple to install. Hardest part was removing all the panels.


Quick delivery. Fits perfectly and easy to install.


Product arrived on time and fit the way it was supposed to


Still need to install. Arrived promptly, thanks


Easy quick transaction


2014 Buick Encore

Easier impossible

2016 Buick Encore


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

  • Wire Color Designations for the Curt Wiring Harness C56216
    I attached a link to the installation instructions for the # C56216 that you referenced that detail how it would install in a vehicle. On the input side of the box the black wire is for 12 volt power, the green wire is for right hand stop/turn signal, the red wire is for brake signal, the yellow is for left hand stop and turn, brown is for running lights, and white is ground. On the output side green is right stop/turn, yellow is left stop/turn, brown is running lights, and white is ground.
    view full answer...
  • Recommended Trailer Hitch for 2014 Buick Encore
    For a trailer hitch for your 2014 Buick Encore, I recommend the Draw-Tite Class II Trailer Hitch Receiver # 36554. It has a tongue weight capacity of 300 pounds and a gross trailer weight capacity of 3,500 pounds. I have attached an installation video for you to review. However, please keep in mind that when looking at the owner's manual for your vehicle, it does state that the Buick Encore is neither designed nor intended to tow a trailer. If you do decide to do this, you can use the...
    view full answer...
  • Trailer Hitch and Wiring for a 2015 Chevy Trax
    The wiring harness for your 2015 Chevy Trax is # 118659. None of the other wiring harnesses have been confirmed to fit the 2015. For a trailer hitch I recommend Hidden Hitch model # 90244. It comes with the proper ball mount. For a 1-7/8 inch ball use # 19256 and for a 2 inch ball use # 19258. If you want to use the hitch for an accessory such as a bike rack or cargo carrier then you have to make sure the accessory is rated for use with a Class I trailer hitch. Also, with a bike rack,...
    view full answer...
  • Trailer Hitch for a 2015 Buick Encore
    The wiring for a 2015 Buick Encore is # C56216 and won't be an included item with the Curt Class-I trailer hitch # C11527. The reason wiring harnesses do not come with the hitch is because some vehicles already have a trailer wiring harness so we make them available separately. The hitch # C11527 comes with a complete hardware kit and instructions. If you happen to need a ball mount and hitch ball, I recommend ball mount # C45520 and 2 inch hitch ball # C40018 or a 1-7/8 inch ball # C40001....
    view full answer...

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Info for this part was:

Employee Jameson C
Expert Research:
Jameson C
Employee Laura H
Written by:
Laura H
Employee Cole B
Installed by:
Cole B
Employee Chris R
Video Edited:
Chris R
Employee Wilson B
Updated by:
Wilson B
Employee Kristina F
Updated by:
Kristina F
Employee Isabelle B
Updated by:
Isabelle B

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