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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
THIS ITEM IS NOT A FIT FOR
2015 Keystone Springdale Travel Trailer
CURT

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

Part Number: 56407
In Stock
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$90.49
Retail:$152.95
You Save: 41%
Custom Fit Vehicle Wiring
Not Confirmed to Fit

2015 Keystone Springdale Travel Trailer

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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 56407 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 (63)
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CURT Custom Fit Vehicle Wiring - 56407

  • 4 Flat
  • No Tow Package
  • Trailer Hitch Wiring
  • Vehicle End Connector
  • Plug-In
  • CURT
  • Plug and Lead
  • Powered Converter
  • 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 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 56407 Installation instructions

This Product Fits The Following Vehicles



California residents: click here


Customer Satisfaction Score:

Ratings & Reviews

4.8

63 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:

Everything fit like a glove. Easy installation. Highly recommend Etrailer for all their products and services. I have bought a number of items through them in the last 6 years and there has never been an issue of any kind.



by:

Easy to follow directions great customer service



by:

It has performed very well and the excellent installation video was all that was needed to install the frame hitch and wiring kit. The Curt wiring kit, as your tech explained has just enough wire to be long enough to make the plug into the tail light. If you fail to know that in advance it is easy to route the wiring where it would not reach. This was by far the easiest frame mounted receiver style hitch and wiring kit we have installed so far. The height of the Jeep frame allows the entire installation of hitch and wiring to be done without the use of our wheel ramps. Let me touch on an issue that William mentioned, the use of a Swagman platform wheel mount hitch on a Jeep with spare tire mounted in the center of the tailgate on newer Wranglers. This position creates two challenges whether you use the Allen style top tube support style or the one I we installed. The Allen style require the backup camera to be relocated as the bike rack center pillar will obscure it, the Swedman wheel mount style requires use of a 2" to 11/4" extension plus the wheel brackets must be removed and turned upside down to allow the spare tire and tailgate to open completely. Lastly, IMHO all Swedman racks with 1 1/4" mounting frame should be supported with a cable under tension at the highest position possible to relieve the forces created by bicycle weights within specs. As e-assist bikes become more popular it is very easy to exceed the design weight of rack construction. Even two Huffy beach cruiser bikes that are within rack weight design put a lot of stress on this style rack. Not going to debate this issue, had a failure of the center support 1 1/4" beam years ago with significant damage to the two road bikes when beam structurally collapsed.



by:
2025 Jeep Wrangler 4xe

Easy install easy instructions to follow. Workes flawless



by:

Easy to install works great



by:

Works as expected



by:

This harness was a simple plug and play. . Hardest part was running positive wire to the front to the battery. No easy on a fat boy. But got it. Only complaint was the green wire with harness to the passenger side needs to be at least a foot longer. I actually added 2 feet on mine and gave me plenty of room to work. Great product th



by:

This is a very good product and easy to install. I mainly followed the YouTube video that they did. I give this four stars because the product I received was missing the fuse link.



by:

Easy install. No splicing required.



by:
2021 Jeep Wrangler

Fit's just like its is suppose to



by:

Wired up easily enough and worked. Installed on a 2018 Jeep JLU Sahara.



by:
2013 Ford F-150

Ordering from Etrailer is always easy and customer service is above par always. I have NEVER had a bad experience when calling fir assistance on a particular part or placing an order.

I do enjoy watching the videos prior to doing an install to assist with any questions that might have arose while in the process. The system Etrailer has us top notch!



by:
2021 Jeep Wrangler Unlimited

easy install



by:

Was not a direct fit

Victoria H. profile picture

Victoria H.

11/25/2024

Hi William, I'd like to get a little more detail on how this wasn't a direct fit. I have linked the installation video and at about the 6 minutes mark you can see this harness will connect to your taillights. Does your plug resemble the one in the video?



by:

Super easy wiring job if you have a crawler. The instructions on the etrailer site made the entire thing a breeze. Still working great a year later.



by:
2024 Jeep Wrangler Unlimited

Excellent transaction! They are my go to for anything for my Jeep



by:

Best pricing, easy fit, easy installation (the videos are excellent).



by:

I'm still waiting for a refund on the one that was wrong that I had to reorder a new part and pay for it so I'm still waiting for money back



by:
Jeep Wrangler

Easy to install and fits perfectly on my 22 Jeep Wrangler. Works as expected.



by:

Definitley my G0-To place for everything for towing and trailers!



by:
2024 Jeep Wrangler 4xe

Delivered timely easy and easy install



by:

David profile picture

David

8/30/2024

No issues one year later



by:

Arrived on time, product was as describ ed.



by:

Easy install, took my time and it went well, no complaints



by:


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Show More Reviews

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

  • Does Curt Wriing for a 2024 Jeep Wrangler Require Connecting the Power Wire to the Battery
    Yes, the Curt T-Connector # 56407 will require you to route a power wire from the black module box to the battery on your 2024 Jeep Wrangler. I know it isn't convenient, but it's the best setup when it comes to a trailer wiring harness since this tees in behind your tail lights and then powers your trailer lights via the battery in your Jeep. The separate 12V power wire powers your trailer lights but also doubles as a way to protect the OEM wiring on your Jeep.
    view full answer...
  • Recommended Plug and Play Flat Tow Wiring Harness for a 2024 Jeep Wrangler Sport
    Hey James, welcome back! The only plug and play wiring harness I have for flat towing is the Curt Custom Tail Light Wiring Kit for Towed Vehicles item # C96JR. This has a 4-way connector that plugs into your motorhome. This plug and play harness connects directly to your 2024 Jeep Wrangler Sport behind the driver's-side and passenger's-side tail lights. Please note that if you have a 4-way trailer connector like item # 56407 you won't be able to use it will you're flat towing your Jeep....
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  • Is 12 Volt Outlet Needed For Curt 4-Way on 2024 Jeep Wrangler
    I'm sorry I don't quite understand what you're asking.
    view full answer...
  • Best Flat Tow Setup For 2005 Jeep Wrangler Rubicon With Park Sensor System
    Hello Michael, thanks for reaching out. I see you placed an order with us last week for the Roadmaster Smart Diode Kit # RM63MR. This is what you will need for the flat tow wiring for your 2025 Jeep Wrangler Rubicon with the park sensor system. The # RM74ZR and the # RM-15267 would not be needed. The Brake Lite Relay # RM-88400 or the Converter # RM-732 would also not be needed for this. I will go ahead and provide a full parts list of your Jeep so you can reference this with what you...
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  • Trailer Hitch and Wiring for 2024 Jeep Wrangler with Tow Bar Wiring
    Hey Bill, for your 2024 Jeep Wrangler we have the Curt trailer wiring kit part # 56407 that is a confirmed fit but we don't have anything that plugs into factory trailer wiring. This kit installs inline with the taillight wiring like the tow bar wiring kit you have now. This installs in the exact same way basically and is completely compatible with it. Then for a hitch the etrailer hitch part # e98856 is a fit and a great option. If you were really wanting to use the factory trailer...
    view full answer...
  • 4-Flat Trailer Wiring For 2024 Jeep Wrangler With Tow Bar Wiring
  • Can Roadmaster Tow Bar Wiring Kit Install with Curt Trailer Wiring on 2025 Jeep Wrangler
    Hey Michael, you can install the Roadmaster diode kit part # RM-15567 on your 2025 Jeep Wrangler that has the Curt trailer wiring kit part # 56407 on it and all you need to do is splice it into the wiring that runs to the connectors of the Curt it and you'd be fine. The same signal runs through both sides of the connectors of the Curt harness so either way it would work just fine.
    view full answer...
  • Best Way To Add 4-Flat And 7-Way To 2021 Jeep Wrangler Sahara With Curt C96JR Flat Tow Harness
    Hello Garry, thanks for reaching out. The plug your are referring to on the Curt # C96JR is actually an accessory port for plugging in a 4-flat trailer harness. The weird part is, Curt stopped offering the 4-flat accessory plug while leaving the design of the flat tow harness the same. So the accessory port is still there, but the plug you would need to go with it is not available. That said, you can still add a 4-flat and 7-way combo to your Wrangler. Here is what you will need: - Curt...
    view full answer...
  • Recommended 4 Flat Trailer Harness for a 2019 Jeep Wrangler
    Hey John, we don't have that wiring harness but it does look like all it is, is a 4 flat harness so you can use the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 56407. This harness will plug into your exisiting harness and provide a 4 flat to the rear of your Jeep, doing essentially the same thing as 58920. If there is anything else I can do for you, please feel free to drop a comment and let me know!
    view full answer...
  • Troubleshooting Trailer Wiring that Doesn't Work with Key On
    Hey Rick, that's really a pretty odd problem to have from your Curt trailer wiring harness part # 56407. Do the taillights of your Jeep also still work when the vehicle is on? Where do you have the red power wire of the harness ran to on your Jeep?
    view full answer...
  • What Parts To Install Redarc Brake Controller On 2018 Jeep Wrangler JL
    Hello Matt, thanks for reaching out. Does your 2018 Wrangler JL already have a 7-way trailer plug on the back. Not quite sure what the "half tow package" would include but if you don't already have a 7-way or 4-flat, you will need the Curt T-Connector # 56407 and the Universal Installation Kit # ETBC7 to complete your wiring. Then for the brake controller, the Redarc # RED85CR is what you will need. This comes with all of the necessary wiring, mounting panel and pigtail for your Wrangler.
    view full answer...
  • Recommended 4-Way Wiring Harness for a 2023 Jeep Wrangler JL
    Hey Keith. For a plug and play wiring harness that fits your 2023 Jeep Wrangler JL, you'll want the Curt T-Connector Vehicle Wiring Harness item # 56407. This custom-fit T-connector plugs into your Jeep's wiring harness, which is located behind the driver's-side and passenger's-side tail lights. It will provide you with a 4-way connector. I recommend using the No-Drill Mount for Electrical Mounting Bracket - Short item # 18140 and the item # C42CR bracket. to secure the 4-way connector...
    view full answer...
  • Looking For A Tow Bar Wiring Kit With A Charge Line For My 2021 Jeep Wrangler
    Hey Jeffery, I am not aware of any part like that we carry. Our tow bar wiring kits are just going to be for the lights. So something like our Curt # 56407 for your 2021 Jeep is going to get your lights all set. Then you would go with something like our Roadmaster Battery Charge Line Kit # RM-156-25 to be able to trickle charge that battery when towing. Is your motor home already equipped with the 12v circuit?
    view full answer...
  • Recommended Plug and Play Flat Towing Wiring Harness for a 2020 Jeep Wrangler
    Yes, we do! It is the Hopkins Custom Tail Light Wiring Kit item # HM39VR. This will give you a plug and play set up to control your 2020 Jeep Wrangler's lights with your RV.
    view full answer...
  • Recommended Hitch and Wiring Harness for a 2020 Jeep Wrangler
    I would be happy to make a couple for you! To add a hitch to your 2020 Jeep Wrangler, I recommend the Curt item # 13432. This hitch is custom fit and bolts to your Jeep super easy with four included bolts. It's got a 2" receiver with a 3,500 lbs towing capacity and a 350 lbs maximum tongue weight so it will be great for towing or trailer or using accessories like a bike rack or cargo carrier. I have linked an installation video below to help you get this hitch set up. For a wiring harness,...
    view full answer...
  • Recommended Hitch for a 2024 Jeep Wrangler
    To add a hitch to your 2024 Jeep Wrangler, I recommend the Curt item # C13392. This hitch is custom fit and bolts to your Jeep with included hardware. This is a class III hitch with a 2" receiver. It has a 5,000 lbs towing capacity and a 500 lbs maximum tongue weight. I really like the Curt Hitch item # C13392 because of its ease of installation. This hitch bolts right to your rear bumper beam with four grade 8 bolts. I have linked an installation video below to help you get this hitch...
    view full answer...
  • Availability Of Bracket For Permanently Mounting A Trailer Plug On Bumper
    We generally use a bracket like the Mounting Bracket # 18144 to permanently mount a 4-flat plug. You can use a few self-tapping screws to mount in on the bumper, or really wherever you want. We usually will attach the bracket to the cross-tube of the trailer hitch.
    view full answer...
  • Can You Recommend a Hitch for a 2024 Jeep Wrangler Unlimited?
    Yes, I can! To add a hitch to your 2024 Jeep Wrangler Unlimited, I recommend the etrailer item # e98856. This hitch is custom fit and bolts to your Jeep with included hardware. It is a class III hitch with a 2" receiver so it'll be great for towing, bike racks, and cargo carriers. It has a 5,000 lbs towing capacity and a 500 lbs maximum tongue weight. I really like the etrailer Hitch item # e98856 because of its ease of install. This hitch attaches directly to your bumper beam with 4...
    view full answer...
  • Does the Curt Hitch CU74FR Fit a 2024 Jeep Gladiator Rubicon?
    Yes, it does! The Curt Hitch item # CU74FR has been confirmed to fit all models of the 2024 Jeep Gladiator including the Rubicon. This hitch is by far one of the easiest to install. It easily attaches to your Jeeps rear bumper with three included bolts. The installation takes only a few minutes. The Curt Hitch item # CU74FR is a class III hitch with a 2" receiver. It has a 5,000 lbs towing capacity and a 500 lbs maximum tongue weight. I have linked an installation video below to help...
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  • What is the Highest Capacity Hitch for a 2024 Jeep Wrangler Unlimited?
    The highest capacity hitch for a 2024 Jeep Wrangler Unlimited is the Draw-Tite item # DT78MR. This hitch is custom fit and bolts to your Jeep with included hardware. The Draw-Tite item # DT78MR is a class III hitch with a 2" receiver. It has a 4,500 lbs towing capacity and a 675 lbs maximum tongue weight. I really like this hitch because of the ease of installation. Getting it set up only requires installing four bolts to preexisting holes in your Jeep's bumper. I have attached a couple...
    view full answer...
    Image 1 for Image 2 for
  • What Hitch and Wiring Harness Will Fit a 2024 Jeep Wrangler Sport?
    I checked with our vendors and to add a hitch to your 2024 Jeep Wrangler Sport you will need the Curt item # C13392. This hitch has been confirmed to fit by Curt for the 2024 models so long as yours does not have a diesel engine. Since your Jeep does not have the tow package you will need the Curt T-Connector Vehicle Wiring Harness item # 56407. This custom-fit T-connector plugs into your Jeep's wiring harness, which is located behind the tail lights. It will provide you with a 4-flat...
    view full answer...
  • Recommended Hitch and Wiring Harness for a 2024 Jeep Wrangler Unlimited Sport w/out the Tow Package
    I checked with our vendors and to add a hitch to your 2024 Jeep Wrangler Unlimited Sport you will need the Curt item # C13392. This hitch has been confirmed to fit the 2024 models so long as yours does not have a diesel engine. This hitch will work great with either of the Kuat Pivot Swing Away Adapters item # PVD20B for the driver's side or the more popular item # PVP20B for the passenger side. Both are compatible with the Kuat NV 2.0 Base Bike Rack item # BA22B you mentioned. Since...
    view full answer...
  • Recommended 7-Way Connector for a 2024 Jeep Wrangler Unlimited w/out the Tow Package
    Yes, I would be happy to help you! To tow a trailer with brakes and install a 7-Way harness on your 2024 Jeep Wrangler Unlimited you will need two separate wiring harnesses because they don't make just one that'll do the job. The first harness you'll need is the Curt T-Connector Vehicle Wiring Harness item # 56407. This custom-fit T-connector plugs into your Jeep's wiring harness, which is located behind the tail lights. This will provide you with a 4-flat connector. The second harness...
    view full answer...
    Image 1 for Image 2 for
  • Can Curt Trailer Wiring and Blue Ox Tow Bar Wiring Install on 2023 Jeep Wrangler At Same Time
    Yes, both the Blue Ox tow bar wiring kit part # BLU79FR and the Curt trailer wiring kit part # 56407 can install at same time on your 2023 Jeep Wrangler Unlimited and the order in which they install does not matter at all.
    view full answer...


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


Info for this part was:

Employee Jeff D
Installed by:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Joshua S
Video by:
Joshua S
Employee Daniel D
Video by:
Daniel D
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
Chris R
Employee Jonathan Y
Video Edited:
Jonathan Y
Employee John S
Video Edited:
John S
Employee Wilson B
Updated by:
Wilson B
Employee Ryan G
Test Fit:
Ryan G
Employee Bradley B
Test Fit:
Bradley B
Employee Jesse B
Test Fit:
Jesse B

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