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  1. Custom Fit Vehicle Wiring
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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 # C39DR
Retail:$101.95
Our Price: $84.99
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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. 1-800-940-8924 to order CURT custom fit vehicle wiring part number C39DR or order online at etrailer.com. 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 (7)
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CURT Custom Fit Vehicle Wiring - C39DR

  • Custom Fit
  • 4 Flat
  • Trailer Hitch Wiring
  • CURT
  • Powered Converter

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.


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 tail light housings
    • 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: 3 amps per circuit
    • Tail lights: 6 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 tail light housings. You will have to remove interior trim paneling to access these connection points. 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 beneath your vehicle, near the trailer hitch. A mounting bracket (sold separately) is recommended to keep the connector secure.


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.



56479 Curt T-Connector - Surface Mount Technology - 4 Wire

Installation Details C39DR Installation instructions

This Product Fits The Following Vehicles




Customer Satisfaction Score:


Customer Reviews

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - C39DR

Average Customer Rating:  4.9 out of 5 stars   (7 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.

by:
Toyota Corolla

We installed this wiring harness while we had the bumper cover off to install the Curt towing hitch for the Corolla Cross. That made installing the harness a breeze. We simply zip-tied the cables to already existing wiring, slipped the hot wire to the battery (in the hatch on the hybrid Corolla Cross) through the rubber grommet under the right taillight, and brought the four prong trailer plug down right alongside the hitch. We tested all the car and trailer lights before reassembling everything, and they all worked perfectly. Note we have the Corolla Cross Hybrid SE, which does not have LED taillights.



by:
Toyota Corolla

Worked for 2022 Corolla Cross LE



by:
Toyota

Both the heavy hitch receiver and wiring kit came nicely packed, undamaged with all parts necessary. Installation, while a bit complicated to remove the plastic trim, is straightforward on my Toyota Cross, a simple bolt-on swap with the factory steel bumper, eight bolts, and a small trim before reinstalling the plastic cover.



by:
2022 Toyota Corolla

Item worked well. Was able to run all wiring inside my 2022 corolla cross L AWD



by:
2023 Toyota Corolla Cross

Perfect



by:



by:


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

  • Availability of Curt Custom Wiring Harness for 2023 Toyota Corolla Cross
    The correct Curt wiring harness for your 2023 Toyota Corolla Cross is the # C39DR. This plugs into the connection points behind your rear tail lights and will provide you with a 4-way to power your trailer's signal lights.
    view full answer...
  • Parts Needed For Adding a 7-Way Trailer Connector To a 2023 Toyota Corolla Cross Hybrid
    First you will want to start with the Curt T-Connector Vehicle Wiring Harness # C39DR to connect to the tail lights on your 2023 Toyota Corolla Cross Hybrid. This will then connect to the 7-Way # ETBC7L. The 7-way includes the wiring needed to connect to the 12v vehicle battery. This is how the on board brake controller on your tear drop trailer will get its power. I recommend using the Mounting Bracket # C58000 to secure the 7-way and 4-way connectors to the Curt Trailer Hitch Receiver...
    view full answer...
  • How Much Does the Curt Hitch for a 2023 Toyota Corolla Cross Weigh?
    The Curt Trailer Hitch item # C64DR weighs 28 lbs. This hitch is custom fit and bolts to your 2023 Toyota Corolla Cross with included hardware. This is a class I hitch with a 2" receiver. If you are planning on towing you will also need a wiring harness item # C39DR and a ball mount kit item # C45534.
    view full answer...
  • Trailer Hitch Receiver and 4-Way Flat Vehicle Wiring Harness For a 2024 Toyota Corolla Cross
    Yes, the Curt Trailer Hitch Receiver # C64DR is confirmed to fit your 2024 Toyota Corolla Cross. This is custom fit so you will not have to drill into your vehicle frame to install the hitch. I recommend installing the Curt Vehicle Wiring Harness # C39DR when you install the receiver. This will give you a 4-way flat connector which will allow you to attach to the wiring on most small trailers. It will also allow for Auxiliary Lighting # C53201 if you are using a hitch mounted accessory.
    view full answer...
  • Trailer Wiring Harness For 2023 Toyota Corolla Cross Hybrid XSE
    There is a fit for a trailer wiring harness for your 2023 Toyota Corolla Cross hybrid XSE, from Curt: - Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C39DR I verified directly with Curt for you that this harness is a fit for the Hybrid XSE.
    view full answer...
  • 2022 Toyota Corolla Cross trailer Wiring Instructions Made Easy to Read
    I couldn't locate an order from you but I'm guessing you're needing to install either the Curt T-Connector # C39DR or the Tekonsha T-One # TK25VR on your 2022 Toyota Corolla Cross. Wiring instructions can be a bit hard to follow at times and while we currently July 2023) don't have an installation video made for either kit, I can list out the steps and hopefully make it easier for you: - Disconnect vehicle battery - Use 10mm ratchet to remove screws holding driver and passenger tail...
    view full answer...
  • Correct 4-Way Wiring Harness For 2023 Toyota Corolla Cross Hybrid
    Definitely smart to check to get the right wiring harness, and while we can't do anything with VINs, I can tell you there are two options for 4-way harnesses on your 2023 Toyota Corolla Cross Hybrid. The difference is just if your model has LED taillights or not, but I checked directly with Curt for you and can tell you the right one you need based on the submodel of your Corolla Hybrid: - 2023 Toyota Corolla Cross Hybrid S or SE: Curt T-Connector Vehicle Wiring Harness # C39DR - 2023...
    view full answer...
  • Correct Curt Trailer Hitch Fit for a 2022 Toyota Corolla Cross
    The correct Curt Trailer Hitch Receiver for a 2022 Toyota Corolla Cross is the part # C64DR which offers a direct bolt-on fit. It has a 1-1/4" opening which can be used for towing or hitch mounted accessories like bike racks and cargo carriers. That said, if you will be towing you'll need to pickup the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # C39DR and Curt Towing Starter Kit for 1-1/4" Hitches part # C45147. If you're just using the hitch for a...
    view full answer...

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


Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Wilson B
Updated by:
Wilson B
Employee Sabrina W
Written by:
Sabrina W

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