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  1. Custom Fit Vehicle Wiring
  2. CURT
  3. 4 Flat
  4. No Tow Package
  5. Trailer Hitch Wiring
  6. Vehicle End Connector
FITS 2025 Buick Encore GX
Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
CURT

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

Part Number: C37UR
In Stock
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$75.91
Retail:$132.95
You Save: 43%
Custom Fit Vehicle Wiring
Confirmed to Fit
2025 Buick Encore GX

with LED Taillights

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2025 Buick Encore GX CURT custom fit vehicle wiring. CURT reviews from other Encore GX owners. Expert custom fit vehicle wiring advice with thousands of helpful questions and answers. Great prices and fastest shipping.
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  • Reviews (7)
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2025 Buick Encore GX - Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

  • 4 Flat
  • No Tow Package
  • Trailer Hitch Wiring
  • Vehicle End Connector
  • Plug-In
  • CURT
  • Plug and Lead
  • Powered Converter
  • Hidden

Quickly and easily install a 4-way trailer connector on your Buick Encore GX 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.


Features:

  • 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 rear access panels
    • 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


Specs:

  • Maximum amperage:
    • Stop/turn lights: 5 amps per circuit
    • Tail lights: 7.5 amps per circuit
  • Limited 1-year warranty


Installation

This custom-fit T-connector plugs into your vehicle's wiring harness, which is located behind the driver's-side and passenger's-side rear access panel. You will have to remove the cargo tie downs and scuff 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.



56456 CURT T-Connector Buick Encore GX Wiring Harness with 4 Pole Trailer Connector

Installation Details C37UR Installation instructions

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 T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector-C37UR Spec Review

Ellen: Hey everybody. I'm Ellen here at etrailer.com and we're taking a quick look at the CURT custom fit vehicle wiring harness. This is going to give you a four pole at the back of your vehicle so that you can do any kind of basic wiring for a trailer. So if you're going to be pulling something behind you and you need to be able to have the light functions from your vehicle transferred to your trailer, this is going to be the kit for you. Now, if you need an upgrade to a seven pole, this is kind of the first step in doing so and we have a lot of information and parts available if that's going to be something you're going to do later on down the road. But, as far as this kit, the nice thing about it is that there's no splicing required, since it is custom fit.

It's just going to be a plug and play application and it uses your vehicles plugs to just run right in line. It's not going to affect the overall functions of your lights when you're driving normally. It doesn't change anything about how your vehicle operates. It's just going to be there as an additional system that's going to allow you to have that function for your trailer lights.So let's take a closer look and we'll talk about what this actually fits. This works for the 2020 through the current year model for the Buick Encore GX.

So if you have that vehicle, this is going to match up with your vehicle's wiring. So all you have to do is get access to the back of your taillights, plug and play with the plugs right there. That's where it gets the name T vehicle wiring harness, since this makes a T. The green wire is going to go for the passenger side. The red, yellow, and brown goes to the driver's side.

There's also a white wire. That's going to be your ground. The black wire coming off of here is your power supply and that needs to go to your battery or potentially a fuse block if you have another source of power there or another hookup there. Usually, it's going to be going to your positive side of the battery in the vehicle. And you'll have a fuse to go in line between that.

It also supplies a fuse to go in there. It's a 10 amp fuse. So you're going to be protected by the fuse there and also by the box itself. This is kind of the brains of the operation. This is also going to protect your vehicle from any kind of back feed from your trailer into your vehicle and vice versa, so it helps keep everything safe.This is a nice unit here. They have all this potting material, which is kind of like an epoxy to keep everything safe, so it's going to be protected from any kind of shocks and road vibrations and it also protects it from any kind of water, dirt, or debris from getting inside. So you just need to find a nice sturdy spot to mount this. It does come with some zip ties to help you make that connection, also a couple of butt connectors to make the connection between your bulk wire and the power wire and also between the bulk wire and your fuse holder and then the fuse holder to your battery. So you get all those connectors here in that bag, a piece of double-sided foam tape to connect your module box here.So pretty straightforward. It's something you can do in your driveway, in your garage, usually takes maybe about an hour or two. The hardest part, usually, is just getting access to the taillights themselves. It might be a couple of screws or fasteners that you have to remove out or there might also be some panels inside your vehicle that you'll have to pop out, but, other than that, pretty straight forward and you can get it done in an afternoon.So I hope this has been helpful in deciding if this is the right choice for you. We do have a lot of wiring accessories and trailer accessories here at etrailer.com, so be sure to check us out and thanks for watching..

Customer Satisfaction Score:

Ratings & Reviews

5.0

7 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.

by:
Buick Encore

This fits a 2021 Buick Encore GX with LED taillights perfectly. Before you purchase a wiring harness, double check the plugs on your taillights. I purchased a Tekonsha T-One Wiring Harness with 4-Pole Flat plug that claimed to be compatible. It was not. Had an entirely different plug even though it claimed to be for my vehicle with LED taillights.



by:
2020 BuickEncore GX

Directions could have been a bit more explicit but went on with no issues.



by:

I have used your products in the past and always have been happy.



by:

It arrived on time and installed it easily. Thanks



by:

You have great service got everything I needed and earlier then you said I would very happy with your company



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

  • Trailer Hitch for 2023 Buick Encore GX
    Hi Christopher; the 2023 Buick Encore GX is a little harder to get to since it is under "See More." Buick isn't as popular as some other brands and they aren't all shown on the initial list in our fitguide. For a hitch I recommend the Draw-Tite Max-Frame Trailer Hitch Receiver # DT55GR. I saw you also looked at wiring so you need the # C37UR (if you have LED taillights) or # C97VV (if you do not have LED taillights) as well. Then for a ball mount, check out the etrailer Adjustable 2-Ball...
    view full answer...
  • Trailer Hitch and Wiring for 2021 Encore GX Towing Kayak Trailer
    Hi D; for a hitch I recommend the Draw-Tite Max-Frame Trailer Hitch Receiver # DT55GR. This is a Class III hitch with a 2" receiver which will give you the most options for ball mounts and other accessories. Even though the hitch is rated for 3,500 lbs you will still be limited to the 1,000/100 lbs of towing/tongue weight of your vehicle. For wiring, it all depends on your tail lights. If they're LED you need # C37UR and if they're incandescent # TK58FR. Both will provide you with a 4-way...
    view full answer...
  • Is There a Class III Receiver For a 2021 Buick Encore GX For Carrying a Power Chair?
    Currently the Curt Trailer Hitch Receiver # C94UR is the only receiver we carry for your 2021 Buick Encore GX. This is a class I receiver with a 1-1/4" receiver. You will not be able to find a class III receiver for your Encore due to the very low capacity of the vehicle for trailer towing and tongue weight rating. To haul most power chairs with your Encore you will need a small trailer like the Detail K2 # K2MMT4X6 so you can stay under the 1,000lb trailer capacity. For the trailer you...
    view full answer...
  • Recommended Trailer Wiring Harness For A 2022 Buick Encore GX
    The difference between the two options for your 2022 Buick Encore GX is that the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C37UR is for models with LED lights while the Curt Powered Tail Light Converter with 4-Pole Flat Trailer Connector # C59236 is for models without LED lights. You'll just need to choose the correct wiring harness based on the type of tail lights you have, LED or Incandescent. I've attached the installation instructions for both of...
    view full answer...

Do you have a question about this Custom Fit Vehicle Wiring?


Info for this part was:

Employee Lindsey S
Written by:
Lindsey S
Employee Kathleen M
Installed by:
Kathleen M
Employee Wilson B
Updated by:
Wilson B
Employee Jonathan Y
Video by:
Jonathan Y
Employee David F
Test Fit:
David F

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