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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: C56378
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$45.40
Retail:$77.95
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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. 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 C56378 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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CURT Custom Fit Vehicle Wiring - C56378

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

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. 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 - no cutting or splicing of wires
    • Locate connection point in rear cargo area
    • Plug in connector
  • 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 driver's-side interior trim panel in your rear cargo area. Once you've plugged in the T-connector, insert the included 10-amp fuse into the integrated fuse holder. Then install the 10-amp mini fuse and two 7.5-amp mini fuses in the rear fuse panel.


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 plug 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.



56378 CURT T-Connector - Surface Mount Technology - 4 Wire

Replaces Curt C56118

Installation Details C56378 Installation instructions

This Product Fits The Following Vehicles



California residents: click here


Customer Satisfaction Score:


Customer Reviews

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - C56378

Average Customer Rating:  4.8 out of 5 stars   (331 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. Connector plugs directly into existing wiring. Powered converter reduces strain on wiring system and is made using SMT to ensure superior performance.

by:

Arrived as ordered and when promised. Simple instrictions with pictures.



by:

Three words sum up the service: Quick, Simple, Painless!

Thanks!



by:

Great company! Super fast delivery, friendly helpful service and a product that performs as promised.



by:

I'd give it 5 stars if it wasn't for the fact that the kit comes with 2 fuses (4 are needed).

Bottom line, I'd buy it all over again!



by:
2012 Honda Odyssey

Good prodcut. Directions could be a little better, and unfortunately there was no video for this product, but following the video for a similar product helped.



by:
2011 Honda Odyssey

Worked great. Just plugged in the connector fuses and ran the wire and bingo all done. Grate e-sight to shop at.



by:

3 day dilvery. Install same day hitch lined up nice and looks nice.
I am very happy with it.Instructions clear good price.

Jim



by:

Instructions were simple and clear. Wiring harness connected quickly to all factory plugs and could not have been easier. If instructions are unclear for any reason, take 2 minutes and watch the how to video.



by:
2011 Honda Odyssey

Curt T-Connector installed just as video showed on my 2011 Honda Odyssey. I am 110% satisfied with shopping/installation experience. I highly recommend to all you do-it-yourselfers...



by:

Fit perfectly, installed easily.It took me a couple of hours to install (in the snow 200 ft from my toolbox - don't ask). Instructions were clear with nice pictures. I had looked at a YouTube video previously which made it even easier. The only hard part was finding a good grounding point. I used an existing hole after I ground off the undercoat. Worked perfectly.
John



by:
2011 Honda Odyssey

This kit fits my 2011 Honda Odyssey perfectly- it plugs right in. So for those of you with the new odyssey, rest assured that this is the wiring harness you need.



by:

Works like a charm. The installation instructions could be just a little more detailed. Be careful when removing the interior trim. It is very easy to break all them cheap plastic fasteners. That can become a head ache. Just take your time.



by:
2011 Honda Odyssey

Recieved the product in good time and installed the wireing harness
in about 45 minutes from start to finish being carefull not to damage
any of the trim.



by:

Very easy install. I was nervous about taking sections of the trim off, but they went right back in place, no problem. As another review said, it was a little difficult finding a grounding spot. I used the screw-in trim holder half way up the trim, on the driver's side, right next to the hatch back door. After sanding off the paint on that spot of the frame, I was able to ground the unit when I used that screw to put the trim back in place.



by:
Honda

Works goodThis wiring was fairly easy to install. I used a combination of the instructions in the kit and instructions from the Honda factory tow package to see where all the clips were in the panels so I didn't break anything. The rear plastic panel is difficult to reinstall since you have to make sure you get the retaining clips in the right spots on both sides of the panel. You can probably run the wires though the rubber plug in the rear of the vehicle and under the bumper if you wanted them near the hitch. I left mine inside the vehicle for now. The wiring seems to work as it should.



by:

This harness was extremely easy to install and fit nicely inside the trim panel and it didn't require any splicing as there was already a ground bolt right below the left tail-light. It also maintains a strong current so trailer lights are equally as bright as vehicle lights.

Highly recommended!



by:
Honda Odyssey

I installed my harness back in April. See my review on 4/26/11. Yesterday was the first time I had a chance to hook up the boat and go fishing. Much to my chagrin, the trailer lights didn’t work. With the help of my mechanic, it appeared that electricity was going from the car into the converter but not out. I called Etrailer and talked to Rose. She was very helpful. She arranged for me to return the wiring harness under their warranty. Rose explained that I will get a credit for the unit after they have a chance to look at it. Since I only live an hour away, I dropped off the unit at their Wentzville location. Rose also prepared a will-call order for me to pick up a replacement harness while I was there. Very smooth. When I arrived, I received first-rate help from Courtney with my return and will-call pick up. While I was there, I saw they were having a sale on bike racks—one too good to pass up. Courtney provided a lot of information to help me pick out a 4-bike Yakima bike rack. Then she diligently ensured I had all the proper pieces that come with the rack. Now, after having a pretty good day, imagine my dismay the next day when the new vehicle wiring harness did not work. OK, what are the odds of getting two defective wiring harnesses—pretty slim. After another couple hours of trouble shooting with my mechanic, I am embarrassed to admit I misread the fuse diagram for my Odyssey. I had installed the fuse for the wiring harness in the wrong location in the vehicle fuse panel. The darn think works just great now. Hats off to the people at Etrailer for this top-shelf service—when it was really my mistake.



by:

Very easy to install. I did not like the idea of the wiring just hanging in the trunk area, so I cut an opening into the storage compartment on the side trim panel so I could feed the wiring into it and keep it there when not in use.

Roy profile picture

Roy

5/15/2013

Great idea - I did the same thing, thanks! Installation was very easy, under 30 minutes start to finish.

PatrickB profile picture

Patrick B.

5/15/2013

Glad to hear the install went well for you. Enjoy the new towing setup!
John O. profile picture

John O.

7/13/2013

did the same thing. worked well. Thanks for the idea.



by:

Easy installation, took approx 25 minutes or so. Pulled back trim and plugged in... EASY. Came with everything I needed including fuses, twist ties, and adhesive for unit.

Must difficult part was making sure I could find the right fuse locations in the car to add.

Bought with receiver kit. Whole installation took approximately 45 minutes (a little longer to make sure wiring was put in place).

2 days later used it unexpectedly to retrieve friend's broken down vehicle... worked great!

Bob I. profile picture

Bob I.

7/22/2020

Sill working out great! Durable, no problems using, it has more than paid for itself.



by:
2015 Honda Odyssey

Worked perfectly for my 2015 Honda Odyssey minivan. Easy to install. I popped out the auxiliary power port in the panel near the plug and enlarged the hole enough to get the adapter through and then replaced the plug. The wiring now sits neatly in the side bin when not needed.



by:

Easy install, works as described. Wish there was an easy way to hide or keep wires out of the way, but that is on me. Also like that etrailer is asking me for a review a year later, which gives me more confidence in reviews I read.



by:

Love your website it lead me right to the kit for my car. I also watched your YouTube video. I installed the kit in less than 20 minutes. Great product and great website. Also thanks for reasonable shipping rates. You guys rock!



by: 11/25/2023

The wiring harness lasted less than 2 years. No fuses were blown, the diodes in the Curt controller just stopped working - sending a low voltage to the trailer lights all the time. This is the second Curt trailer wiring harness that has failed on my vehicles.



by:

Haven't opened yet. Harness in box? Excellent service, time order to delivery.



by:
2010 Dodge Nitro

Once the wiring harness arrived, it was installed in less than 20 minuets. Tested it out on the trailer and everything worked great. If I need sports in the furture, this is the first place I’ll look.

Thank you


25
331
Show More Reviews

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

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    To mount the Curt T-Connector Vehicle Wiring Harness item # C56378 to the Draw-Tite item # 76025 you will want to use the No-Drill Mount Bracket item # 18136 and the item # 18144. This will allow you to install the 4-way farther down from the hitch receiver without drilling. There's a lot going on there with the ball mount and safety chains. My personal preference is to get the wiring out of the way. The Curt Easy Mount Bracket item # C58001 you were looking at will work though. Both...
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    The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56378 has the second white quick connect and wire to give you the backup camera function. It is a through wire to allow that system to function correctly. If you have the backup camera, there will be a connection next to the other 4 wire connection point for you to plug it into.
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  • Will the Curt Trailer Wiring Harness for a 2012 Honda Odyssey Work With Backup Sensors/Camera
    The Curt T-Connector Vehicle Wiring Harness part # C56378 is a fit for a 2012 Honda Odyssey with or without backup cameras or sensors so you won't have any issues. There isn't a version of this harness for models with or without backup cameras or sensors as they will not be affected.
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  • Is Curt T-Connector Vehicle Wiring Harness Compatible With 2015 Honda Odyssey With Backup Camera
    The Curt T-Connector Vehicle Wiring Harness # C56378 did not have compatibility with a backup camera when the video was made. You can see in that video that it lacks the additional connection with the white wire that it now comes with. This was added later, and will allow you to plug the wiring harness into both connection points on the panel which will allow you to use the backup camera. That being said, I would recommend the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector...
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  • What Function Does the Connector With Single White Wire Serve on the Curt # 56378 Wiring Harness?
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  • Trailer Wiring Compatible with 2015 Honda Odyssey
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  • Troubleshooting Curt T-Connector Working with 2014 Honda Odyssey
    The best way to determine if the module on your Curt T-Connector # C56378 for your 2014 Honda Odyssey is bad is to use a circuit tester like part # PTW2979 to check the wiring on the input side of the module and then the output side of the module. If you have power going in but not coming out then it's the module. If you have power coming in and going out then the problem is somewhere from the module to the connector. If you don't have power coming in to the module then something is wrong...
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  • Curt Trailer Wiring Harness Does Not have Power on a 2016 Honda Odyssey
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  • Does Curt Trailer Wiring Harness # C56373 Fit 2016 Honda Odyssey LX
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  • Trailer Running Lights Not Working When Connected to 2012 Honda Odyssey with Curt Wiring Harness
    The first and easiest thing to check is the ground connection for Curt wiring harness # C56378. A weak ground could be causing the problem. The ground should be attached to a clean and corrosion free bare metal surface on your 2012 Honda Odyssey. You may need to sand away any paint or coating to get to bare metal. If that does not solve the problem then there are a few other things you can check. I have included a link to our help article on troubleshooting 4/5-Way connectors. This is...
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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
Chris R
Employee Jonathan Y
Video Edited:
Jonathan Y
Employee Cole B
Installed by:
Cole B
Employee Wilson B
Updated by:
Wilson B
Employee Kristina F
Updated by:
Kristina F
Employee Isabelle B
Updated by:
Isabelle B
Employee Amanda M
Written by:
Amanda M
Employee Robert C
Test Fit:
Robert C
Employee David F
Test Fit:
David F
Employee Jacob H
Test Fit:
Jacob H
Employee John A
Test Fit:
John A
Employee Thomas T
Video by:
Thomas T
Employee Ethan H
Video by:
Ethan H

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