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Curt Universal Wiring Harness for Vehicle-End Trailer Connectors

Curt Universal Wiring Harness for Vehicle-End Trailer Connectors

Item # C56229
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This universal harness can be hardwired into your tow vehicle's wiring system so you can install a 7-way trailer connector. 1-800-940-8924 to order CURT accessories and parts part number C56229 or order online at Free expert support on all CURT products. Great prices and Fastest Shipping for Curt Universal Wiring Harness for Vehicle-End Trailer Connectors. Accessories and Parts reviews from real customers.
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  • Reviews (16)
  • Q & A (0)
  • Videos (1)
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CURT Accessories and Parts - C56229

  • Trailer Wiring
  • Vehicle Wiring Harness
  • 7 Blade
  • CURT
  • Universal

This universal harness can be hardwired into your tow vehicle's wiring system so you can install a 7-way trailer connector.


  • Lets you install 7-way wiring on any vehicle
  • Hardwires into your tow vehicle's wiring system


  • Wiring configuration:
    • Green: right turn signal
    • Yellow: left turn signal
    • White: ground
    • Brown: tail lights and side marker lights
    • Blue: electric brake
    • Black: auxiliary power
    • Purple: backup/reverse lights
  • Length of wires: 24"
  • 1-Year limited warranty

56229 Curt US Car Universal Wiring Harness for Vehicle-End Trailer Connectors

Installation Details C56229 Installation instructions

California residents: click here

Video of Curt Universal Wiring Harness for Vehicle-End Trailer Connectors

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Review of CURT Trailer Wiring - Universal Wiring Harness - C56229

Hello everybody, this is Jeff at Today, we're gonna take a look at this Curt Universal Wiring Harness for Vehicle-End Trailer Connectors. Now, this universal harness can be hardwired into your tow vehicle's wiring system, so that you can install a 7-way trailer connector on any vehicle. If you see on the table here, it includes everything shown here, the 7-way connector, in the bag here they have seven butt splices to connect your wires, seven heat shrinks to seal them, couple of cable ties, and a nice set of instructions that'll describe how this installs. Now, this harness is referred to as a US car connector, and a US car 7-way socket is a standardized automotive electrical socket, provides a connection point for trailer wiring. This socket's used across several different makes and models, so it allows for easier access to parts for both manufacturers and vehicle owners.

Now, on this one here, the specs on this is the wiring, and just go over each wire and what it connects to. We'll start with the green wire, the green wire is for your right turn signal, the yellow wire is for your left turn signal, the white will be your ground wire, the brown wire right here, that'd be your taillights and side marker lights, the blue wire is electric brake, the black is auxiliary power, and the last one is the purple wire, which are backup/reverse lights. And you can see if this stretches out, it gives you about 24 inches for the length of wires on those. But that should do it for the review on the Curt Universal Wiring Harness for Vehicle-End Trailer Connectors..

Customer Reviews

Curt Universal Wiring Harness for Vehicle-End Trailer Connectors - C56229

Average Customer Rating:  4.8 out of 5 stars   (16 Customer Reviews)

This universal harness can be hardwired into your tow vehicle's wiring system so you can install a 7-way trailer connector.


Jessica was very helpful and I received my item in a timely manner


I look all over the place for this connector even went to a junk yard you were the only one that had it. I needed it for my plow lights hook up it worked great. Thank you!

Still working great thank you
Colin E - 08/29/2018


Got the wiring Harness for my 2002 GMC 2500 (Curt Universal Wiring Harness for Vehicle-End Trailer Connectors) excellent construction and instructions. Can beat Curt for quality. I'm not novice at wiring trailers so I have had issues in the past but it is nice to see the folk did a great job designing and building this harness. Works great.


I particularly liked the quality of the connector and its condition. The wires are rated for the level of current they cary rather than just being all the same gage, and the clip end come ready coated to protect from corrosion.


Parts availability quickly shipped


Well made comes with everything you see.
truck was a little to old to have one but did have all the wires bundled to hook one up.
So this will be a great upgrade to have.
It will also be easy next time to replace my seven way hookup when it goes out as it did this time from road salts from the winter.

Still connected, was a great upgrade for my truck that did not have one
Kem - 12/06/2020


Great products
Extremely Safe shopping
FASSSSSSST shipping too
Great Communications !!!


The part was a perfect fit!
I was not
paid for this endorsement.
Salt Lake City


Does exactly what it is expected to do


Always fast deliverty and you guys have everything


works as promised!!!!! super fast shipp ing!!!!!







See what our Experts say about this CURT Accessories and Parts

  • Availability of Extension from Factory U.S. Car Connector on Tundra to 7-Way Connector
    The best solution we have available to bridge that short gap between the factory U.S. Car type connector on your Toyota Tundra to the actual 7-Way connector is with the Curt Universal Wiring Harness # C56229. This will plug into the truck's factory U.S. connector on one side and then provides a pigtail harness at the other end that you can hardwire into your existing connector. I have attached the installation instructions for this product that you can also take a look at.
    view full answer...
  • US Car Connector Wiring Harness Installation to Match 7-Way Function
    The Curt Universal Wiring Harness for Vehicle-End Trailer Connectors # C56229 is what is referred to as a US Car Connector. It will match pin location functions so your lights will match up. The colors on this harness may be slightly different as you mentioned, so you will want to match locations for functions to remain the same. I've attached a photo to assist with the function locations.
    view full answer...
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  • Will Curt Universal Wiring Harness # C56229 Work on 2013 Ram 3500
    The Curt Wiring Harness # C56229 referenced in your question is a universal harness that will work on any truck that is equipped with a factory tow package, including your 2013 Ram 3500. The U.S. Car connector end of this harness will indeed plug into the back of your existing 7-Way/4-Way connector and provide you with pigtail wiring that can be hardwired to the truck. The wire leads include all the needed 7-Way functions. If you are looking to replace a faulty/damaged US car connector...
    view full answer...
  • Compatibility of the Curt Wiring Harness # 56229 with Hopkins Endurance Connector
    The Curt Universal Wiring Harness for Vehicle-End Trailer Connectors # C56229 will give you the US Car connection that is compatible with the Hopkins Endurance Multi-Tow 7-Way RV and 4-Way Flat Trailer Connector - Vehicle End # HM40950 you mentioned. The harness and the connector will work well together.
    view full answer...
  • What Function Does the Purple Wire on the Curt Connector # C56229 Connect to
    Since the Curt Wiring Harness for Vehicle-End Trailer Connectors # C56229 is a universal item it can be used for many different vehicles. The difficult thing sometimes is that not all vehicle manufacturers use the same wire color coding system. The colors can even vary from year to year with the same makes and models of vehicles. The best way to know that you have installed the Curt connector correctly is to use a Circuit Tester # PTW2992 and the test the functions of the wiring you are...
    view full answer...
  • Fit of Curt Wiring Harness for Vehicle-End Trailer Connectors C56229 on 2014 Ram 3500
    The Curt Wiring Harness for Vehicle-End Trailer Connectors # C56229 is a universal-fit item that will work on any tow-package-equipped vehicle that uses a round U.S. Car type connector for its wiring. This part provides one such round connector on one end and pigtail wire leads on the other for all 7-way functions. This could be used with a 7-way socket like Hopkins # HM48480 which has screw terminals for making connections. All custom-fit wiring items for your 2014 Ram 3500 are shown...
    view full answer...
  • How to Wire a 7-Way Trailer Connector on a 2008 Dodge Ram 3500
    I took a look in the owner's manual for your 2008 Dodge Ram 3500 and there was no mentioned of the wire colors for the trailer wiring. Therefore, in order to make sure the correct connections are made you need to test each of the wires for function with a circuit tester. To do this you will need to have a friend sit inside the vehicle and activate the signals while you test the wires at the rear to determine which wire is for which function. Once you determine this you can then use the...
    view full answer...
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  • Replacement 7-Way Trailer Connector for a 2015 Toyota Tacoma
    The Reese Multi-Plug Wiring Harness part # 74682 will work on your 2015 Toyota Tacoma so long as the US Car Connector which plugs into the back of a 7-way was not damaged. If it was then you would need to cut off the damaged connector and then wire in the Curt Universal Wiring Harness part # C56229. Please keep in mind that you are more than likely going to need a new mount as well for which I recommend using part # C57202 because it doesn't require drilling.
    view full answer...
  • How To Install Both In-Bed and Bumper 7-Way on a 2000 Ford F-250
    Yes, if your 2000 Ford F-250 came with a factory 7-way trailer connector you can use the Curt 5th Wheel/Gooseneck Custom Wiring Harness part # C56070 to install an in-bed 7-way. If you need a bumper 7-way as well then we have the Curt T-Connector Vehicle Wiring Harness part # C55774 which will work with the above. Please note that if your F-250 did not come with a factory 7-way then that means you most likely don't have the US Car Connection Plug (see photo) and you will need to install...
    view full answer...
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  • Replacement 7-Way Connector for a 2008 Tacoma SR5 4x4
    If the plug you have on your 2008 Toyota Tacoma is the US Car Connector like the Curt # C56229 then you can simply use the Curt T-Connector # C55774 or the Hopkins # HM40975 to add 4-Way and 7-Way connectors to your vehicle. This is much more cost-effective and it a simple plug-in installation. If you happen to have something else please send me a picture of it so I can see what we have that may be compatible.
    view full answer...
  • How to Replace the Factory 7-Way on a 2006 GMC Sierra 2500HD with No Connector
    Yes, you are exactly right. The Curt Universal Wiring Harness part # C56229 has the same US car connector that would have came on your 2006 GMC Sierra 2500HD from the factory. The female end of this connector will plug right into the male end on the Replacement Custom Multi-Tow 7-Way and 4-Way Trailer Connectors part # 30955. In order to join the blunt cut wires on your truck to this harness I recommend using part # DW05744-10. These connectors are made of heat shrink which will help keep...
    view full answer...
  • Are The Curt Universal Wiring Harness & Mighty Cord Replacement 7-Way Compatible?
    Since the Curt Universal Wiring Harness for Vehicle-End Trailer Connectors # 56229 and the Mighty Cord Replacement 7-Way RV-Style Trailer Connector for Factory Tow Package # A10-7072VP have round connections both products are a direct fit. To properly operate this product, first you take the wires from the Curt Universal Wiring Harness for Vehicle-End Trailer Connectors # 56229 and connect them to the appropriate wire from the vehicle using wire strippers, heat shrink, butt splices and...
    view full answer...
  • How to Disengage Brakes on a Boat Trailer While in Reverse
    If the brake actuator on your boat trailer has an electric reverse lockout solenoid like part # T4748800 and you were using the 7-way side of the 7- and 4-Pole Trailer Connector Socket part # HM40975 then yes, the brakes would release while in reverse. However, in order to use this harness on your vehicle you will need to have a U.S. car connector plug like part # C56229 already installed. If not then you can use something like part # C57187 to release the brakes on the trailer while in...
    view full answer...
  • Recommended Wiring To Tap Into Truck 7-Way For Power and Lighting To a Camper Shell
    If your truck already has a 7-way which uses the Curt Universal Wiring Harness Connector # C56229 for the 7-way, you will be able to use the Hopkins Endurance 5th Wheel/Gooseneck 90-Degree Wiring Harness # 41157. This contains a 10' harness which will tee into your current wiring. You can mount the other 7-way in you bed and use the 7-Way Round RV Style Trailer Connector # A7WCB to run the wiring for your camper shell. Otherwise you will be able to splice the end of the harness to hardwire...
    view full answer...
  • How to Install the Curt Trailer Connector Part # C57101 on a 5th Wheel Trailer
    The reverse light circuit is almost always on the center pin of a 7-way trailer connector which you can see from the attached photo. If your 5th wheel trailer has reverse lights then you can just tap into this but if not you would need to run a wire from the trailer side trailer connector all the way back to the end of the trailer. Please keep in mind that in order to install the Curt Trailer Connector part # C57101 you are first going to have to splice the Curt Universal Wiring Harness...
    view full answer...
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  • Part Needed to Add 2nd 7-Way to Vehicle
    All you need to add to your truck to give you a second active 7-way is a harness like Demco's # DM8555002. This plugs in behind the existing 7-way socket and gives you a second 10-foot harness and 7-way vehicle-type socket. This way both your goose neck trailer and your camper will have identical connection points with all power and lighting signals. You can use this as long as your current 7-way has a round U.S. Car connector like part # C56229 plugged in to the back of the socket. The...
    view full answer...

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Info for this part was:

Employee Jeff D
Installed by:
Jeff D
Employee Adam R
Expert Research:
Adam R
Employee Laura H
Written by:
Laura H
Employee Wilson B
Updated by:
Wilson B
Employee Kristina F
Updated by:
Kristina F
Employee Isabelle B
Updated by:
Isabelle B

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