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  4. No Tow Package
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  6. Vehicle End Connector
Curt T-Connector Vehicle Wiring Harness with 5-Pole Flat Trailer Connector
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CURT

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

Part Number: C56510
In Stock
$50.40
Retail:$88.95
You Save: 43%
Custom Fit Vehicle Wiring

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etrailer Installation
We'll connect you with nearby partnered installers who know this exact setup.
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. 1-800-940-8924 to order CURT custom fit vehicle wiring part number C56510 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 5-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (10)
  • Q & A (0)
  • Videos (2)
  • Photos

CURT Custom Fit Vehicle Wiring - C56510

Highlights

  • Custom Fit for Your Vehicle: Works with your vehicle's wiring
  • Tow Ready Lighting: 5-way flat connector powers trailer signal, brake, and reverse lights.
  • Plug-and-Play Install: T-connector plugs in without cutting or splicing vehicle wiring.
  • Clean Factory Fit: Harness uses existing connectors for a secure, hidden install.
  • Upgrade From 4-Way: Adds fifth circuit for reverse lights—ideal for boat or utility trailers.
  • No Adapter Needed: Direct 5-way connection avoids extra parts or wiring modifications.

Features to know about

Installs Clean Without Cutting or Splicing: Plug-In 5-Way Connection

Running a new trailer wiring setup doesn’t have to mean cutting into factory wires. The Curt T-Connector Vehicle Wiring Harness with 5-Pole Flat Trailer Connector plugs right into the existing vehicle wiring. It gives you a clean, factory-style hookup for your trailer lights without using adapters or splicing into any circuits.

Adds Reverse Signal for 5-Way Trailers: Built-In Fifth Lead

Standard 4-way wiring handles running, turn, and brake lights, but boat and utility trailers with surge brakes often need a fifth wire for the reverse light signal. This harness includes that fifth lead right out of the box so you can connect a 5-way flat trailer plug directly, no extra adapters required.

Straightforward DIY Setup: Ready to Use Out of the Box

Most folks can install this harness in their driveway using basic tools. The connectors are shaped to fit only one way, so there’s no guesswork about which wire goes where. Once plugged in, you’ve got a solid 5-flat connection ready for towing without digging into your vehicle’s wiring harness.

Reliable Power for Trailer Lights: Consistent Signal Every Time

The Curt T-Connector provides a dependable link between your vehicle and trailer lights. Once connected, it sends the proper lighting signals through weather-resistant plugs designed for long-term use. You’ll have bright, consistent running, turn, brake, and reverse lights every time you hook up your trailer.

Specs

Technical Specifications

  • Image: Comparison chart showing different Curt T-Connector vehicle wiring harness models with labeled callouts to illustrate connector configurations and wiring layouts.
  • Note:

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

Installation Details C56510 Installation instructions

This Product Fits The Following Vehicles




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

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 Satisfaction Score:

Ratings & Reviews

5.0

10 reviews
Review sort icon
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.

by:



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Worked perfectly!



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Easy to install good directions Excellent sales staff



by:

Fair price and super easy to install (s elf-install)!



by:

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



by:

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



by:

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



by:

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!



by:

Everything ive gotten from you guys has worked great and got here on time.I will be ordering more for my trailer.


10
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See what our Experts say about this CURT Custom Fit Vehicle Wiring

  • Recommended 7-Way Wiring Harness for a 2007 Chevy Colorado
    I would be happy to help you. If your customer's Colorado doesn't have a 7-way connector it means they don't have the factory towing package so you will need to add two harnesses to get a 7-way. No one makes a single harness that will give you a 7-way connector. The first wiring harness you will need is the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector item # C55510. This harness is custom fit and plugs into existing wiring located behind the rear bumper on...
    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...
  • 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...

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


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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