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  1. Custom Fit Vehicle Wiring
  2. CURT
  3. 4 Flat
  4. Trailer Hitch Wiring
  5. No Tow Package
  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: C45FV
In Stock
$79.98
Retail:$111.95
You Save: 29%
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 C45FV 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 (52)
  • Q & A (0)
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CURT Custom Fit Vehicle Wiring - C45FV

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

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 in rear cargo area
    • Plug in T-connector
    • Run hot lead to car battery
  • Includes a powered tail light converter that connects directly to your battery to avoid overloading your 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: 3.0 amps per circuit
    • Tail lights: 6.0 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 trim access cover, scuff panels, and tail lights to access these connection points. Once you've plugged in the T-connector, run the hot lead to your car battery, which can be found in the engine compartment. 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 trunk.


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.


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.



56487 Curt T-Connector - Surface Mount Technology - 4 Wire

Installation Details C45FV Installation instructions

This Product Fits The Following Vehicles



California residents: click here


Customer Satisfaction Score:

Ratings & Reviews

4.7

52 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:

Great Hitch, it help me a lot with moving my trailer, moving my power equipment. From place to place. Very strong Hitch and easy installation.



by:
2023 Mazda CX-5

Easy to install. Was able to put wire thru rubber grommet in firewall and keep the power cable from battery inside the vehicle and tucked under plastic flooring to the back of vehicle.



by:
2023 Mazda CX-5

The green wire was too short. I had to add more wire to it so it would reach.
It is ok now.

Katrina D. profile picture
Etrailer Expert

Katrina D.

1/4/2024

If you are needing some additional wiring, you can use part # 16-4B-1.

Robert profile picture

Robert

1/4/2025

Great!



by:
2023 Mazda CX-5

The unit looks like an excellent fix for my needs. The plug and play is what I like about the unit. If the price was 20 bucks cheaper, it would make my wallet feel better. If this is as good as other parts that I have ordered from Etrailer, I will be happy with the final outcome.



by:

Product itself and install videos are great (5 stars) but you need to do a better job with packaging. See photos.



by:

Installed a 2” hitch and wiring harness on my new 2023 Mazda CX-5. Install went Great. The self help videos were Awesome, explained everything perfectly. All parts went in with no problem. Product is built really well and it fit perfect. Thank you.



by:

Worked as expected. A little time consuming to hook up, but that was because of the vehicle, not the product. Happy with the purchase as usual.



by:
2025 Mazda CX-5

Product connected with no issues, other than having to run the power cord all the way from the back of the car to the battery in front. The connectors for connecting the wires together are cheaply made. Had to buy new ones from local auto parts store to connect the fuse holder to the battery.



by:
Mazda

Nice gauge wires. Only issue I had was getting through my firewall in Mazda CX-5. But that is not an issue with this wiring, rather installer challenge. I was going to mount next to my hitch point as on a previous car, but I won't be using it that often I can't run it out of the rear hatch.
Very satisfied.



by:

It’s about as good as I get. Install of hitch required a second person and removing the muffler. I wish they made galvanized hitches which is the main reason for removing a star, already a little rust is showing. That is the way they are.



by:

need to run power wire from 12V supply makes installation very hard,



by:
2024 Mazda CX-5

works great on my mazda cx5. Had installed harness from mazda, never could get it to work. curt t connector was so much simpler to install and works the way it should



by:

Fairly simple to install. I did some small modification to meet my needs. WATCH THE VIDEO. The written instructions are a bit messy.



by:

Excellent customer service! Thank you S tacey.

Shaun profile picture

Shaun

7/21/2024

Excellent



by:

I ordered the wrong trailer harness, so I have reordered and am returning the one I received.



by:
2023 Mazda CX-5

I installed this kit on a 2023 Mazda cx5. Plugged right into the factory harness in trunk. No splicing needed. Then just run positive to battery with fuse kit provided. Instructions and video are great.



by:
2023 Mazda CX-50

This harness was fantastic. This made a first time hitch install a breeze. The brake harness connectors were perfect and came with everything needed to complete a clean install. Very satisfied with everything I purchased to make this happen.



by:

Very satisfied with your website. Second time ordering from the site. Order was delivered on the date shown when ordered.



by:

Fit perfectly on the CX-50. The most difficult part was running the wire from the rear to the battery terminal. Total time took about 1.5 hrs but I’m excited to be able to haul my ATV around again! Would definitely recommend.



by:

Fit perfectly. The step by step video guide is most helpful and I knew exactly what to expect before I started the job. Thanks for the help



by:
2022 Mazda CX-5

it arrived quickly in good condition



by:
2023 Mazda CX-5

Easy to install (other than pulling car apart!). Instructions were clear. It took me about 1 hour to disassemble the car, complete all the wiring, and re-assemble the car.



by:

Great product. Worked exactly like des cribed



by:

It worked and the instructions were good.
Seemed
like a bit of overkill and overpriced for what it does.Running a wire to the battery is ridiculous.



by:

Delivered in the same container as the hitch. Without any problems .


25
52
Show More Reviews

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

  • Is Flashing Or Reprogramming Required For Curt C45FV On 2025 Mazda CX5?
    Hey there Moyer, that's a great question, but I don't know why your dealer was telling you that. The Curt T-Connector Vehicle Wiring Harness # C45FV does not require flashing or reprogramming after installation, and we haven't had any customers come back and say they needed to do so. You can see in the installation video I linked below, the process is straight forward and plug and play, without any cutting or modification to your OEM wiring. Let me know if you have any other questions or...
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  • Does The Curt T-Connector C45FV Fit The 2025 Mazda CX-50 Hybrid?
    Hello again, John. Yes, the Curt T-Connector # C45FV will fit the 2025 Mazda CX-50 Hybrid. I just checked with Curt and they confirmed it to fit all models of the 2025 CX-50 and this includes the hybrid models.
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  • Trailer Hitch For 2025 Mazda CX-50 Hybrid
    Hello Ric, thanks for reaching out. The only hitch we have confirmed to fit the 2025 Mazda CX-50 Hybrid is the Curt # C33MJ. We have confirmed with Curt that this will fit the Hybrid model. We have also heard back from a few of our own customers who have successfully installed it on the Hybrid model. This hitch has a 2" receiver and a 3,500 lb towing capacity. If you intend to tow a trailer, you will also need the Curt T-Connector # C45FV. Do you already have a ball mount and ball? Or...
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  • Recommended Hitch for a 2023 Mazda CX-5
    To add a hitch to your 2023 Mazda CX-5, I recommend the etrailer Hitch item # e98902. This is a class III hitch with a 2" receiver. It is custom fit and bolts to your Mazda with included hardware. I really like this hitch because the crosstube mounts behind the rear bumper. This leaves only the 2" receiver visible. The etrailer Hitch item # e98902 has a 4,000 lbs towing capacity and a 600 lbs maximum tongue weight. This hitch has plenty of capacity to not only carrier accessories but...
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  • Recommended Hitch for a 2023 Mazda CX-50
    The best hitch for your 2023 Mazda CX-50 is the Curt Trailer Hitch item # C38BR. This hitch is custom fit and bolts to your Mazda with included hardware. This is a class III hitch with a 2" receiver. It is made in the USA and has a 3,500 lbs towing capacity and a 525 lbs maximum tongue weight. I really like this hitch because the crosstube mounts behind the rear bumper cover leaving only the 2" receiver visible. This not only looks better but it also helps with ground clearance. I have...
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  • What is the Best Hitch for a 2024 Mazda CX-5?
    The best hitch for a 2024 Mazda CX-5 is the etrailer item # e98902. This hitch is custom fit and bolts to your Mazda with included hardware. This hitch is custom fit and bolts to your Mazda with included hardware. The etrailer hitch item # e98902 is a class III hitch with a 2" receiver, it has a 4,000 lbs towing capacity and a 600 lbs maximum tongue weight. I really like this hitch because the crosstube mounts behind the rear bumper cover leaving only the 2" receiver visible. This not...
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  • Recommended Trailer Hitch And Wiring Harness For A 2023 Mazda CX-5
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  • 2024 Mazda CX-5 Trailer Hitch and Wiring Recommendations with Mounting Brackets
    Hey Steve! I really like having the wiring sit next to the receiver as well so I definitely get where you're coming from. Here are the parts I recommend installing on your 2024 Mazda CX-5: - etrailer Trailer Hitch Receiver # e98902 - Curt T-Connector Vehicle Wiring Harness # C45FV - Mounting Brackets # 18144 and # C57202 There are a few grommets in the bottom of your hatch that you can route the 4-Way connector through and then you'll use the mounting brackets to hold the 4-Way next...
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  • Will The Curt C45FV Activate Tow Mode On A 2023 Mazda CX-50?
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  • 4-Way Trailer Wiring that Fits 2023 Mazda CX-5
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  • etrailer Trailer Hitch Receiver Compatible With a 2022 Mazda CX-5
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  • Does The 4-Way For a 2023 Mazda CX-5 Require ECU Programming?
    You will not need to have your ECU flashed or programmed to install the 4-Way Vehicle Wiring Harness # C45FV on your 2023 Mazda CX-5. This connects inline of your vehicle tail lights and uses a powered module to then send power to your trailer tail lights.
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  • Will The 4-Way Wiring Disable The Reverse Safety Sensors On a 2023 Mazda CX-50?
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  • Recommended Wiring Harness for a 2023 Mazda CX-5
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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Joshua S
Video by:
Joshua S
Employee Thomas T
Video by:
Thomas T
Employee Chris R
Video Edited:
Chris R
Employee John S
Video Edited:
John S
Employee Wilson B
Updated by:
Wilson B
Employee Michael B
Installed by:
Michael B
Employee Jacob H
Test Fit:
Jacob H
Employee Ryan G
Test Fit:
Ryan G
Employee Sabrina W
Written by:
Sabrina W

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