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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 # C56407
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Custom Fit Vehicle Wiring

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Custom Fit Vehicle Wiring C56407 - Custom Fit - Curt
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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. Call 800-298-8924 to order Curt custom fit vehicle wiring part number C56407 or order online at etrailer.com. Free expert support on all Curt products. Guaranteed Lowest Price 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 (66)
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Curt Custom Fit Vehicle Wiring - C56407

  • Custom Fit
  • Trailer Hitch Wiring
  • Curt
  • 4 Flat
  • 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 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 your trunk on the passenger's side. 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.



56407 Curt T-Connector - Surface Mount Technology - 4 Wire

Installation Details C56407 Installation instructions

This Product Fits The Following Vehicles



California residents: click here



Customer Reviews

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - C56407

Average Customer Rating:  4.9 out of 5 stars   (66 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.

- C56407
by:

Great product the instructions are very easy to understand 696091



- C56407
by:
2018 Jeep Wrangler

The kit worked on my 2018 jeep wrangler JL unlimited. It took about 3 hours to install. It was not difficult to do. It just takes time to run the wire to the battery (there are videos out there saying you need to pull apart the back compartment. It is not needed. You can feed the wire up alongside the other taillight wire and then just tuck it behind the carpet and the plastic all the way to the engine compartment). 549298



- C56407
by:

Product works as advertised. The only very small issue, I wished the wiring for the passenger side would be a little longer. 662764



- C56407
by:
2018 Jeep Wrangler

Hally was super helpful with my order of the wiring harness for my 2018 Jeep Wrangler Sahara JLU. Thank you! 538525



- C56407
by:
Jeep

Today I installed the harness - took me 2 hours but was EASY. - $93.25 (the one thing I am proud of is that I got so strategic with my wiring that I NEVER used a zip tie :). Also I didnt even have to drill through the firewall. Ran it under the jeep on the drivers side then up through hood and over to battery. I made sure the wires and VERY hidden (I ran them inside of the opening of the rock rails) and away from anything that could get potentially hot. NOTABLES: 1. I had to add about 10 inches of wire to the passenger side (used heat shrink connectors). 2. The connector for the battery is too big for the smaller wires. I used a slightly smaller one and worked perfectly. 541924


Comments
Its perfect! Would buy it again if I had to in a heartbeat!
Dustin - 07/15/2019

57817

- C56407
by:
2018 Jeep JL Wrangler Unlimited

Curt has just made one Rubicon JL owner very happy. This product works great and I didn't have to spend the big bucks for the Mopar version. One small problem, the green wire to right side tail light could have been ten inches longer. 526294



- C56407
by:
Jeep

Worked great on my 2018 rubicon JL w/LED lights easy plug n play. Hardest part is hiding wire underneath Jeep. Ran power wire along side carpet and pannels, tucked it underneath pannels. Ran it thru grommet on fire wall on Driver side then to battery. 570791



- C56407
by:
2018 Jeep Wrangler

Installed on my 2018 Wrangler JL 2 door. It took me about an hour with help but we were taking it slowly. The install video on the product page is excellent. I watched it ahead of time and again, bit by bit, while doing the job. I’m very happy with the final results. 612629



- C56407
by:
2018 Jeep JL Wrangler Unlimited

Shipped when stated and completely. Also had available video to aid in install. Very pleased with all aspects of purchase and using on my 2018 JL Unlimited. Also purchased the Hitch and was more than happy with this has well. Thank you and I’ll be checking out other things to add to my Jeep in the coming months/years. 591634



- C56407
by:

This wiring harness has very easy instructions no problem everything works like it should very good product save me a ton of money dealership said major wire job will be $1000 which was crazy it was a plug and play with one wire running to the front and connecting to the battery 637713



- C56407
by:
2018 Jeep Wrangler

Product worked out great. The customer service was even better, no one contacts you anymore to let you know there is another part number available after the original order was placed, etrailer did!!! Thanks for the great overall service! 2018 Jeep Wrangler Unlimited Sport JL!! 539217



- C56407
by:
2018 Jeep JL Wrangler Unlimited

Maiden voyage with the wiring harness and seven pin adapter and protective loom. etrailer has the products and associates to back it up. Terrific support, videos and live help if needed. Perfect fit parts. Value and quality can't be beat. Thank You etrailer. 544054


Comments
Flawless. Im going to have a brake controller installed at an RV place. Moving up to a small self contained trailer. I hope that there are no issues at that time.
Peter F - 07/14/2019

57806

- C56407
by:
2018 Jeep JL Wrangler Unlimited

Ordered the receiver wiring harness for my '18 Wangler JL. Been looking for one which isn't a shortcut or over priced. Very impressed with the ordering process and follow through with eTrailer.com. When the box was delivered, received an email from eTrailer informing me it was delivered. Ran the power wire from the battery to the driver side in the wiring channel located on the back firewall of the Jeep. Drilled a hole in the top plug just large enough for the wire to squeeze through to prevent water creeping in. Then gently wrapped the power wire around the wiring harness to the back tail light, zip tying occasionally. Bonded the control unit (with a little JB weld to help the sticky tape over time). Ran the wires across to the receiver and other tail light. Then connected the battery using the fuse link provided. In total, the effort took 1 hour and 15 min. Kit contained everything I needed. Fantastic experience with eTrailer.com 541305



- C56407
by:

Easy install. Video is super helpful. You could pay $750 for a dealer installed tow package or buy this bad boy and a receiver for less than $200. $50 more bucks for beer and you still come out on top. Would buy again. 690626



- C56407
by:

Easy installation, the videos attached to my order were very helpful. I would recommend this product. 802958



- C56407
by:

Easy to install, time consuming but nothing was hard about it. It would have been nicer if the crimp connectors were the heat shrink type. I just ended up soldering the connections. A direct battery connection is required for those that don't know. Over not bad to install. 797604



- C56407
by:

Great product easy to install worked pe rfectly. 795434



- C56407
by:
2019 Jeep Wrangler

This fit perfectly and works great, but the directions are seriously lacking. The installation video on the etrailer website clarified installation quite well. Running the battery wire through the frame was the most difficult and time consuming part even when using stiff tubing to snake through the frame first. It is still doable and much less expensive than having the dealer do it. 790825



- C56407
by:

This harness was easy to install and the directions were plenty detailed. Took me about an hour to get it done. 784514



- C56407
by:

Works well. Wrangler L chassis more complicated than K version, so needed the garage to put it in. Has been working fine. 784097



- C56407
by:
2019 Jeep Wrangler

My order consisting of a receiver hitch and wiring harness for my 2019 Jeep Wrangler. The wiring harness was a pretty easy install, with the help of the etrailer [online] video. The fasteners connections were correct and everything need for install was provided in the kit. The receiver hitch arrived yesterday. I have not installed the hitch at this time. The hitch appears to be of good quality, and the price was well below their competitors pricing. 785149



- C56407
by:

I will tell you that this kit was a little intimidating, you want to me to connect directly to the live battery and the rear taillights? You betcha. Video assistance and reading up to it is key, all of which was available through e-trailer's website. This, coupled with the actual hitch option itself to add a 2" receiver, to a Jeep Wrangler (2018 JL) both worked like a champ and wasn't all that hard to install. Thank you etrailer! 783516



- C56407
by:

great product, great quality. 777883



- C56407
by:

The hitch and harness have worked reliably for the past year. No issues at all, very pleased with them and they are highly recommended for anyone looking for sturdy, reliable equipment. 770989



- C56407
by:
2019 Jeep Wrangler Unlimited

Installation was simple. Video was very helpful. Great quality and price. 769917


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Show More Reviews

Ask the Experts about this Curt Custom Fit Vehicle Wiring

  • How Difficult is Curt Trailer Hitch and Wiring Installation on a 2019 Jeep Wrangler Unlimited
    The Curt Trailer Hitch # 9883544 that you were looking at has actually has a 20 minute estimated install time by Curt so even if you aren't very familiar with trailer hitch installations you can be very confident about this installation. Just make sure that you have a torque wrench that can at least hit the 150 ft-lbs mark like part # ALL944001. I do recommend the Curt Trailer Hitch # C13392 instead though. This has the same installation as the one you referenced with the only difference...
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  • Why Does Trailer Wiring 2018 Jeep Wrangler JL Need to Run Directly to Vehicle Battery
    Not all vehicles can handle the additional amperage draw of the trailer taillights on the vehicle taillight circuits. Those vehicles need setup that draws power from the battery. Some vehicles have higher rated circuits that can handle this, and others need to have the power drawn straight from the battery to protect the taillight circuits. While it seems easier to just run the power wire to an available accessory circuit it's not the best idea to go that route. In the event of a short...
    view full answer...
  • Does Hot Lead on Wiring Harness for 2018 Jeep JL Wrangler Unlimited Have to be Run to Battery
    Thanks for the purchase and that is a good question, but you must run the hot lead directly to the battery when installing a 4-way, which in your case is the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56407. The reason is this is the only way to ensure your car's wiring is not otherwise affected, and you can run the hot lead from your battery in any manner you see fit. To do this you may need Wire Loom, 10' Long # 7509-10 and Loom Clamp -1/4" # A0250....
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  • 4-Way Harness for 2019 Jeep Wrangler JL Rubicon
    There are wiring harnesses that are designed for your 2019 Jeep Wrangler JL Rubicon, and I recommend the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56407, which is a confirmed fit for your '19 Jeep without a factory tow package. This harness does in fact plug in to points in your Jeep's rear cargo area, though it does require you to run a hot lead to your battery. This allows the unit to power the converter which protects your wiring, and it is something...
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  • Troubleshooting Wiring Harness on 2018 Jeep JL Wrangler Unlimited
    The Dielectric Goo # 11755 is definitely a good idea because it will help prevent your wiring harness from corroding, but if you don't use it that doesn't mean the Curt Wiring Harness # C56407 on your 2018 Jeep JL Wrangler Unlimited should fail. These harnesses do connect to your Jeep's tail lights so one of two things are the likely issue. First, the connections aren't being fully seated into the tail light harness so you will want to double-check that connection. The other potential issue...
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  • Does Wiring Harness on 2018 Jeep Wrangler Need Hot Lead to Battery?
    The T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56407 that fits your 2018 Jeep Wrangler MUST have a hot lead run to the battery because the port you are referencing is not rated to handle additional amperage. Using this instead of a battery can lead to a fire or fried electrical circuits in your vehicle, so please run the hot lead to your Jeep's battery.
    view full answer...
  • Wiring Harness for 2019 Jeep Wrangler Unlimited
    The best trailer lighting harness for your 2019 Jeep Wrangler Unlimited is the Curt T-Connector Wiring Harness # C56407 . This harness comes with a wired power converter to reduce strain on your factory wiring system and the T-one connectors allow for easy installation behind your tail lights. I've linked an install video to this answer that will walk you through the installation of this harness on your 2019 Jeep Wrangler JLU. If you need a ball mount and hitch ball to go with your hitch,...
    view full answer...
  • Will the Curt # C56407 Fit the LED Connectors on a 2018 Jeep JL Wrangler Unlimited Sahara
    Yes, we have confirmed with Curt that the T-Connector # C56407 is compatible with the LED connections on your 2018 Jeep JL Wrangler Unlimited Sahara. Attached is a picture of the connector for the Curt that you can compare to the connector on your JL if you would like. I have also attached a link to the written instructions and a helpful article that explains how to route a 12V power wire to the battery.
    view full answer...
  • Troubleshooting Tail Light Issue on a 2018 Jeep JL Wrangler Unlimited
    I recommend you check all the connection points on # C56407 on the Jeep side and the new harness side for any bent pins, corrosion, or debris that could be the cause. Bent pins are sometimes the cause of these types of issues since they're so small and may not be making a good connection. If you find any, just gently straighten them out and reconnect the harness and then test again. If this doesn't address your issue, certainly let me know and we can continue the troubleshooting process. ...
    view full answer...
  • Wire Gauge of Power Wire for the Curt Trailer Wiring Harness # C56407
    The wire that runs to the vehicle battery that comes with the Curt trailer wiring harness part # C56407 that you referenced is 12 gauge.
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  • Trailer Wiring Compatible with 2018 Jeep Wrangler Unlimited Sahara Model with LED Light Package
    The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56407 is designed for the LED lighting package and will work with your Sahara according to my tech contact at Curt. This harness connects to your factory wiring behind each tail light. Once you've plugged in the T-connector, run the hot lead to your car battery, which can be found in your trunk on the passenger's side. Connect the lead to the included fuse holder, and then connect the fuse holder to the...
    view full answer...
  • Troubleshooting Trailer Wiring Running Lights Not Functioning After Wiring Install
    Sonds like the problem is the trailer wiring kit part # C56407 that you referenced. Typically when this happens if you unplug and replug the connectors of the kit back in the circuit will make the appropriate contact and the circuit will come back on. So what you'll want to do if that does not fix the problem is use a circuit tester like # PTW2993 to test the brown wire that comes off of the connector than runs to the left taillight (one with yellow wire) to see if there is voltage...
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  • Correct Curt T-Connector Vehicle Wiring Harness for a 2019 Jeep Wrangler JL
    The correct Curt T-Connector Vehicle Wiring Harness for a 2019 Jeep Wrangler is part # C56407 which offers plug-n-play installation.
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  • Trailer Wiring Harness that Fits 2018 Jeep Wrangler
    For your 2018 Jeep Wrangler JL the best trailer wiring kit is the part # C56407. I attached an install video for this for you to check out as well.
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  • Troubleshooting No Trailer Turn/Stop Lights When Connected to 2018 Jeep JL Wrangler
    Since there are no pins for where the F107 and F109 fuses would install it makes me wonder if maybe a dealer installed an aftermarket wiring harness like the Curt # C56407 which doesn't require those fuses to operate. This kind of wiring kit tees in behind the tail lights and then draws power for the trailer lights directly from the battery on your 2018 Jeep JL Wrangler. With that being said, since you said you don't have those lights working on your trailer the first thing to do is...
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  • Troubleshooting No Power on Red Wire of Curt Trailer Wiring for 2019 Jeep Wrangler JL
    If the red wire of the # C56407 that fits your 2019 Jeep Wrangler Unlimited does not have power on it that would indicate most likely that it's not connected to the battery properly, the fuse isn't installed/has blown, or maybe there's a problem with the wire. I'd be shocked though if the problem is the wire as that's basically unheard of. If you have a circuit tester with a probe like # PTW2993 test the wire before and after the fuse as that will narrow down where the problem might be.
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  • Best 4-Way Trailer Wiring Kit Recommendation for 2018 Jeep JL Wrangler
    The best choice for 4-way trailer wiring for your 2018 Jeep Wrangler JL is the T-One kit part # 118786. Reason is it has higher amperage ratings so it would be more difficult to short out and because T-One in general just makes more reliable trailer wiring for vehicles.
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  • Best Trailer Hitch for a 2018 Jeep Wrangler JL Unlimited
    The best trailer hitch for your 2018 Jeep Wrangler JL Unlimited is the Draw-Tite Max-Frame Trailer Hitch Receiver # 76104 because it has a higher weight rating than the other trailer hitches available (indicating a stronger construction), has a longer receiver to help accessories clear your spare tire, and features safety chain loops that remain under your rear bumper for a clean look after the installation. I have attached pictures and an installation video for you to reference. For...
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  • Installing a Brake Controller on a 2018 Jeep JL Wrangler Unlimited with Factory Tow Package
    While I cannot confirm a brake controller wiring harness for the 2018 Jeep JL Wrangler Unlimited there is still a way to install a brake controller. First you would need a 4-Way wiring harness. We do have trailer wiring harnesses for the 2018 Jeep JL Wrangler Unlimited. For models without the factory tow package Curt has # C56407 and Tekonsha has # 118786. There is a note on the Tekonsha harness though that states it does not currently work with Rubicon or Sahara models. Adding a...
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  • Correct Trailer Hitch for a 2020 Jeep Gladiator
    There are two trailer hitches for a 2020 Jeep Gladiator, the Curt Trailer Hitch Receiver part # CU74FR which is for Rubicon models and the Draw-Tite Max-Frame Trailer Hitch Receiver part # DR64FR which is for all other models such as the Overland. They are both bolt-on options with no cutting or drilling required. If you will be towing then you'll also need a trailer wiring harness for which I recommend the Curt T-Connector Vehicle Wiring Harness part # C56407 which is a plug-n-play...
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  • How To Install Brake Controller On 2018 Jeep JL Without Access To Cold Side Of Brake Switch
    If the 2018 Jeep JL Wrangler has a factory tow package you can just use a Tekonsha Brake Controller p3 part # 90195 with a brake controller harness part # 3073-P to install a brake controller in the Jeep. The harness will plug into a port under the dash and you will not need to worry about hard wiring to the cold side of the brake switch. If your 2018 Jeep JL Wrangler did not come with a factory tow package, you can install a brake controller two different ways. The easiest way is to...
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  • Recommended Trailer Hitch Receiver for 2018 Jeep Wrangler Unlimited JK and JL Models
    All of the JL Wrangler Unlimited hitches we carry will work on the JK Wrangler Unlimited models, but there are some JK model hitches that are not compatible with the JL Wranglers based on fit guide from the manufacturer because they have a shorter receiver. The bolt mounting holes are in the exact same location. Unless you are doing rock crawling, I recommend getting the longer receiver like the # e98856 or Curt # C13392 which will allow more accessories such as bike racks and cargo...
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  • Will T-One Vehicle Wiring Harness fit 2018 Jeep JL Wrangler Sport S with LED Lights
    Yes, the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118786 is perfectly compatible with LED lights. This harness is a fit and work great on a 2018 Jeep JL Wrangler Sport S without the factory tow package. I have added a link to an installation video of this part for you to check out as well.
    view full answer...




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Info for this part was:

Edited by:
Lindsey S
Installed by:
Jeff D
Expert Research:
Jameson C
Video Edited:
Jacob T
Video Edited:
Dustin K
Video Edited:
Chris R
Updated by:
Sarah W
Updated by:
Kristina F
Updated by:
Isabelle B
Written by:
Ronnie R
Test Fit:
Shane H
Test Fit:
Robert C
Test Fit:
Conner L
Video by:
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Video by:
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Video by:
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