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Curt T-Connector Vehicle Wiring Harness with 5-Pole Flat Trailer Connector

Curt T-Connector Vehicle Wiring Harness with 5-Pole Flat Trailer Connector

Item # C56510
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Quickly and easily install a 5-way trailer connector on your vehicle with this custom, plug-in harness. No cutting, splicing or tapping required. Ideal for towing a trailer with surge brakes. SMT construction ensures superior performance. 1-636-306-4830 to order CURT custom fit vehicle wiring part number C56510 or order online at Free expert support on all CURT products. Guaranteed Lowest Price and Fastest Shipping for Curt T-Connector Vehicle Wiring Harness with 5-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
  • All Info
  • Reviews (6)
  • Q & A (0)
  • Videos (2)
  • Photos
  • Why etrailer?

CURT Custom Fit Vehicle Wiring - C56510

  • Custom Fit
  • Trailer Hitch Wiring
  • 5 Flat
  • Converter
  • CURT

Quickly and easily install a 5-way trailer connector on your vehicle with this custom, plug-in harness. No cutting, splicing or tapping required. Ideal for towing a trailer with surge brakes. SMT construction ensures superior performance.


  • Provides a 5-way flat trailer connector at the back of your vehicle to power your trailer's signal lights
    • Fifth pin provides connection to reverse lights to allow proper functioning of hydraulic brake actuator
    • Compatible with 4-way flat trailer connectors
  • Connects quickly and easily - no cutting or splicing of wires
    • Locate connection points beneath the truck bed on the driver's side
    • Plug in T-connector
  • Includes a tail light converter to ensure that your vehicle's wiring matches that of your trailer
  • Constructed using surface-mount technology (SMT) for consistent, reliable performance
    • Maximizes trailer light yield and intensity while producing minimum heat
    • Ensures superior operation in rough road conditions
  • Comes with dust cap for 5-way flat connector


  • Maximum amperage:
    • Stop/turn lights: 3 amps per circuit
    • Tail lights: 5 amps per circuit
  • Limited 1-year warranty


This custom-fit T-connector plugs into your vehicle's wiring harness, which is located beneath the truck bed, along the driver's-side frame rail.

Once installation is complete, the 5-way flat connector will be stowed beneath your vehicle, near the trailer hitch. A mounting bracket (sold separately) is recommended to keep the connector secure.

It is recommended that you use a small amount of grease on all electrical connections - the plugs on your automobile and the 5-pole connector itself - to help prevent corrosion.

Tail Light Converter with Surface-Mount Technology

A tail light converter is built into this T-connector. 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.

56510 CURT T-Connector - Surface Mount Technology - 5 Wire

Installation Details C56510 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Video of Curt T-Connector Vehicle Wiring Harness with 5-Pole Flat Trailer Connector

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

Video Transcript for Curt T-Connector Vehicle Wiring Harness Installation - 2010 GMC Canyon

Speaker 1: Today on this 2010 GMC Canyon we'll be having a look at and showing how to install the CURT T-Connector vehicle wiring harness with a five-pole flat trailer connector, part number C56510.Here's what our wiring harness looks like installed. Now the reason you're going to want a wiring harness such as this one is that this gives you the basic lighting functions that are required by law in order for you to safely and legally tow a trailer. The white wire is our necessary ground connection between our Canyon and our trailer. The brown wire provides our taillight signal and also our running light signal. On that wire we have a total power output of five amps, so it's more than sufficient to tow a small trailer with several incandescent light bulbs or basically as many LEDs as you want, because LED lights do draw less power. The yellow wire is for our left turn signal and left brake light.

The green wire is for our right turn signal and right brake light. On each one of these wires we have a total power output of three amps. If we're towing a trailer, want to limit ourselves to about two or three incandescent bulbs per side or as many LEDs as we want.Now one thing that sets this wiring harness apart from other wiring harness options out there is that this is a five-pole, not a four-pole. That additional pole on this blue wire, that provides a reverse light output. This is great for people that have boat trailers with surge couplers on them to provide braking, because when you have a surge coupler sometimes you have a lockout solenoid which is triggered by the reverse function from your lights on your tow vehicle.

When that is engaged, you can actually back up your trailer easily in the water without the brakes being applied.Now we have this nice dust cover here that will protect our connector when it's not in use, help keep the elements out of it. One thing I recommend doing is taking some dielectric grease, which we have available on our website, and going inside the connector like so. This will just help better protect it from any moisture which would cause corrosion over time. We can use the dust cover, then we can wrap around the safety chain loops on our hitch, and we can secure it into place. It's easily accessible for when we're ready to tow and we don't have any excess wires hanging below our vehicle.One thing many of our customers have liked about this wiring harness is the fact that they have the reverse light output makes it easy for them to tow their boat trailer, and they don't have to worry about splicing into any of their vehicle's wiring in order to get that added function.

Now that we've gone over some features, we'll show you how to get it installed.To begin our install we need to locate our vehicle's wiring harness for our taillights. If we have a look on our driver side on the rearmost frame crossmember, right next to our spare tire, we find our connector. There's a black tab on it right here. If we press down on this tab we can pull to separate. Sometimes it's easier to use a screwdriver to help press down as you pull back.

With our connector separated, it's a good idea to take some dielectric grease and place it on both ends. We can take our new connectors, match up the appropriate ends, and plug them in place. This white wire here with the ring terminal on it that comes off of our module, we need to attach this to our vehicle's sheet metal. We'll do that with our self-tapping screw that's provided. This will provide our ground connection so our lights work properly.We went ahead and routed our wiring to the back of the vehicle. We secured our module box with some of the provided zip ties. You could also use the double-sided tape that's provided, but if you live in an area with a high salt concentration on the roads during the winter, the tape could fail over time and the zip ties won't. We routed the five-pole wiring towards the center of the hitch, securing up any excess. We have it secured around our safety chain loop on the hitch with the provided dust cover.Now we're using a four-pole flat trailer tester to test out our wiring. This will test all of our functions minus the reverse function. You can pick up one of these on our website as part number I26. We'll start by turning on our headlights. As you can see, our taillight and running light function works. Do our left turn signal now. That's working too. Try out our right. That's working. Try out our brake lights. Those are working. With our foot still on the brake, we'll try our turn signals again to make sure everything's working properly. Perfect. Everything's working like it's supposed to. That completes our look at and showing how to install the CURT T-Connector vehicle wiring harness with a five-pole flat trailer connector, part number C56510, on this 2010 GMC Canyon.

Customer Reviews

Curt T-Connector Vehicle Wiring Harness with 5-Pole Flat Trailer Connector - C56510

Average Customer Rating:  5.0 out of 5 stars   (6 Customer Reviews)

Quickly and easily install a 5-way trailer connector on your vehicle with this custom, plug-in harness. No cutting, splicing or tapping required. Ideal for towing a trailer with surge brakes. SMT construction ensures superior performance.


This item was a snap to install. Well, two snaps to be exact! It took longer to walk a block to the Post Office to pick it up, than it did to install this product. The perfect solution to bringing lights to my trailer (including backup lights). No cutting, wire nuts, soldering, or compromising the vehicle's wiring in any way. If only all enhancements were this easy!

2006 GMC Canyon

Works fine, easy to install. Saves splicing into the GMC harness. No splices = less problems later on.


Wiring was correct an easy i installation, installed before installing hitch for more room an easier ty down. 2007 GMC Canyon.


Very easy to install. Only took about 20 minutes to complete.


Easy to install good directions Excellent sales staff

2011 Chevrolet Colorado

Worked perfectly!


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

  • Recommended Adapter for 5-Way Trailer Connector for Boat Trailer
    On your 2016 Subaru Forester, you will use your standard 4-wire trailer connection like # 118467 if you don't already have it, and then you can use the Tow Ready 4 Pole to 5 Pole Trailer Wiring Adapter # 20036. This adapter plugs into your vehicle 4-way and then allows you to connect the reverse light power by splicing into it behind your tail lights using a quick splice connector.
    view full answer...
  • How To Install 5-Way On 2008 GMC Canyon With Factory 4-Way
    The Curt T-Connector Vehicle Wiring Harness part # C56510 is just what you need to install a 5-way trailer connector on a 2008 GMC Canyon and this option means you won't have to use any adapters which require splicing. In order to replace the 5-way on the trailer you can use the Hopkins Endurance 5-Way Flat Trailer Connector part # HM47910.
    view full answer...

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Info for this part was:

Employee Leah B
Edited by:
Leah B
Employee Lindsey S
Written by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Joshua S
Video Edited:
Joshua S
Employee Jacob T
Video Edited:
Jacob T
Employee Wilson B
Updated by:
Wilson B
Employee Kristina F
Updated by:
Kristina F
Employee Isabelle B
Updated by:
Isabelle B
Employee Brent H
Test Fit:
Brent H

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