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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
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: C75WR
In Stock
$77.16
Retail:$133.95
You Save: 42%
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 C75WR 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 (4)
  • Q & A (0)
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CURT Custom Fit Vehicle Wiring - C75WR

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

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 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


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 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 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.



56465 CURT T-Connector Vehicle Wiring Harness with 4 Pole Trailer Connector

Installation Details C75WR Installation instructions

This Product Fits The Following Vehicles



California residents: click here


Customer Satisfaction Score:

Ratings & Reviews

5.0

4 reviews
Review sort icon
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:

Great product. And even better customer service. I had a delivery issue and Josh handled it quickly and followed up after delivery to make sure I was happy. Would definitely recommend etrailer to everyone. Just for the record I ordered 3 other harnesses from other company's before ordering from here and none worked properly.



by:

Fast delivery and all required parts were included. Also no problem with my returning this item. (I ordered the wrong harness!)



by:



by:


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

  • Recommended Wiring Harness for a 2023 Ford F-150 w/out LEDs
    The only possible option we have that would work with your 2023 Ford F-150 without LED's is the Curt item # C75WR. This custom fit T-connector plugs in behind your tail lights but only works if your truck came from the factory with a 7-way connector.
    view full answer...
  • Does Curt T-Connector Vehicle Wiring Harness Interact With 2025 Ford F-150 Tremor Computer
    Hey Chris! The Curt T-Connector Vehicle Wiring Harness # C75WR will not interact with the computer on your 2025 F-150 Tremor. This completely bypasses all of those integrated systems. The converter gets power form the hot lead running to the battery and then the signals come through your tail lights where the T-connectors are attached. Are you adding an LED light bar under the tailgate or something else?
    view full answer...
  • Trailer Hitch and Wiring for 2022 Ford F-150 Without Factory Tow Package
    Hi Alexander; assuming you have the factory step bumper you can use the Draw-Tite Ultra Frame Trailer Hitch Receiver # DT35MR you were looking at. For the wiring, I would check to see if you have the factory wiring harness plugged into the back of the dummy plug on your bumper. If you do you can pull the dummy plug and add the # HM40975. If it doesn't work as is, you may have to run it by the dealer to activate the tow package circuits. If you do not have any factory wiring we will have...
    view full answer...
  • Parts Needed To Add a 7-Way Connector and Brake Controller to a 2023 Ford F-150 XLT w/out a 7-Way
    Hey Bill. Since your 2023 Ford F-150 XLT didn't come with a factory 7-way you'll need two separate wiring harnesses to add one to your truck. The first one you'll need is a 4-way connector that's going to plug in behind your tail lights. You'll need to choose from one of the following options depending on what style your lights are and if you have backup sensors: Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector item # C75WR - Incandescent tail lights, no backup...
    view full answer...
  • Parts Needed to Add 7-Way and 4-Way to 2023 Ford F-150
    Hey Zack, for your 2023 Ford F-150 what you'd need to add both a 4-way and a 7-way would be the part # HM40975. This would plug into the round connector at the rear of your truck and would give you both connectors you need. If you don't have a round connector like what a 7-way needs to install let me know but the only way you'd be able to source that would be to get the intermediate wiring harness for the 7-way from a Ford dealer.
    view full answer...
  • Solution for 7-Way Wiring On 2023 Ford F-150 XLT
    Hello Emanuel; the # C56413 fits the 2015 - 2020 models of the F-150 so it won't work with your 2023. If you have a 7-way dummy plug with wiring plugged into the back of it you can use the 7- and 4-Pole Trailer Connector Socket # HM40975. If you don't have any kind of wiring the installation will be more extensive. You will have to start by adding a 4-way. You can choose from one of the following based on your lights: -Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer...
    view full answer...
  • Recommended Flat Towing Wiring Harness for a 2024 Ford F-150
    What a great question Howard. You should direct that request to Curt, Blue Ox, or Demco though. We don't make the wiring harnesses like the Curt item # C75WR you purchased, which does not have diodes in it. No one makes a plug and play for a 6-Way flat towing connection. The diodes included in the Roadmaster Smart Diode Kit for Variable Voltage LED Tail Lights item # RM38FR, or item # RM-152-1676-7 if you don't have LED lights, are installed to prevent feedback between a RV's electrical...
    view full answer...
  • Can Brake Controller Install on 2021 Ford F-150 without Tow Package
    To install a brake controller on your 2021 Ford F-150 that does not have the factory tow package all you need is the 4-way kit part # C75WR, the # ETBC7 to covert it to a 7-way and wire in the brake controller and then a controller like the Brake EVN # TK63VR.
    view full answer...
  • 4-Flat Trailer Wiring Harness For A 2021 Ford F-150 With Existing Factory 7-Way
    When choosing the correct 4-flat wiring harness for your 2021 Ford F-150 that already has the factory 7-way I recommend The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C75WR. I like this harness because it is constructed using surface-mount technology that gives it a consistent, reliable performance. This harness will plug into your vehicle's wiring harness, which is located behind the driver's-side and passenger's-side tail lights. Just a quick note that...
    view full answer...
  • Recommended Flat Tow Wiring Kit For a 2021 Ford F-150 Lariat with LED Tail Lights.
    I recommend the Roadmaster Universal Wiring Kit with Smart Diodes for Variable Voltage LED Tail Lights # RO44FR for flat towing your 2021 Ford F-150. These smart diodes are specifically designed to work with the LED tail lights on your F-150. Currently there is not a plug and play version available so the diodes will need to be spliced into the tail light wiring. Your F-150 does require a Battery Charge Line Kit # RM-156-25 be used when you are flat towing. This will keep the battery...
    view full answer...
  • Installing Curt 56465 Trailer Wiring Harness on 2021 Ford F150
    My contact at Curt confirms that each taillight assembly on the 2021 Ford F150 does indeed have two connectors, but their 56465 wiring harness which we sell as # C75WR will only fit one of them, as the connectors are different sizes.
    view full answer...


Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Wilson B
Updated by:
Wilson B
Employee Mike S
Written by:
Mike S

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