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  1. Custom Fit Vehicle Wiring
  2. CURT
  3. 4 Flat
  4. Factory Tow Package
  5. Trailer Hitch Wiring
  6. Vehicle End Connector
THIS ITEM IS NOT A FIT FOR
1983 GMC Suburban
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CURT

Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector

Part Number: C55256
$38.27
Retail:$60.95
You Save: 37%
Custom Fit Vehicle Wiring
Not Confirmed to Fit

1983 GMC Suburban

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etrailer Installation
We'll connect you with nearby partnered installers who know this exact setup.
Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into OEM tow package wiring harness - no cutting, splicing or tapping required. 1-800-940-8924 to order CURT custom fit vehicle wiring part number C55256 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 for Factory Tow Package - 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (14)
  • Q & A (0)
  • Videos (1)
  • Photos

CURT Custom Fit Vehicle Wiring - C55256

Highlights

  • Custom Fit for Your Vehicle: Works with your vehicle's wiring
  • Tow Without Factory Prep: 4-way flat connector powers trailer signal and running lights.
  • Plug-and-Play Install: T-connector plugs into factory wiring near rear bumper—no splicing.
  • Clean, Reliable Ground: Integrated white ground wire ensures proper trailer light function.
  • Factory Tow Package Ready: Connects directly to existing vehicle plug for quick hookup.
  • Durable Fit: Weather-tight connectors resist corrosion for long-term towing reliability.

Features to know about

Installs Fast Without Wire Cutting: Plug-In Factory Tow Package Connection

Getting trailer lights wired shouldn’t mean cutting or splicing factory wires. The Curt T-Connector plugs right into the existing factory tow package connectors on the driver-side frame near the rear bumper. It’s a clean plug-and-play install that keeps your vehicle wiring intact while giving you a working 4-way flat trailer connector.

Ready to Tow Right Away: 4-Pole Flat Trailer Connector

Once installed, the harness provides a standard 4-pole flat connector for running lights, turn signals, and brake lights. It’s the common setup for small and midsize trailers, so you can hook up and tow without extra adapters or wiring.

Reliable Ground Connection for Proper Light Function

The included white ground wire ensures your trailer lights work correctly every time. Secure the ground to a solid metal surface and you’re set—no flickering or inconsistent signals when you hit the brakes or turn on your lights.

Simplifies DIY Installs: T-Connector Design

With male and female ends that match your vehicle’s connectors, this harness only fits one way—so there’s no confusion about where anything goes. It’s built for quick, straightforward installation by anyone comfortable doing basic electrical work, with all connections designed to be secure and weather-resistant for long-term reliability.

55256 CURT T-Connector - OE Replacement 4-Flat

Similar to Hopkins HM40145

Installation Details C55256 Installation instructions

This Product Fits The Following Vehicles




Video of Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 4-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 An In-Depth Look at the Curt T-Connector Vehicle Wiring Harness for Factory Tow Package-C55256

Jeff: Hello everybody. This is Jeff at etrailer.com. Today we're going to take a look at this Curt T-Connector Vehicle Wiring Harness for the factory four-way tow package.Now this is a custom fit part. It is designed to fit the 1997 to 2004 Ford F150 trucks with the factory four-way and 1997 to 1999 Ford F250 light duty trucks with the factory four-way and on a custom fit part like this I always like to recommend for you to go to our website, use the fit guide, putting your year and model vehicle. It'll show if this'll work for your application.Now this will provide the four way flat trailer connector at the back of your vehicle to power your trailer's signal lights. And it is designed for use with the factory four-way tow package.

It is compatible with five pole, six pole and seven pole adapters that we do sell separately.And this does connect very quickly and easily. There's no cutting or splicing wires. Basically. You just locate these connection points, which are under the vehicle behind the rear bumper on the driver's side, plug in these T-connector here, ground your white wire, and then run your four-way out towards the back and connect to your trailer.It does come with this nice dust cover that you could install onto your four-way, and you can leave it on there if you prefer. What's nice about is when you're not plugged into a trailer, you can put that cover over the terminals, just like that, and it'll protect them from any damage or from the elements.It does also come with some cable ties to take up any slack in the wiring.

Nice set of detailed instructions that'll describe how to install it. And also this grounding screw. When you go to install this after you make your connection, you do need to ground this white wire. It has the outlet on it. If there's a ground nearby you can attach it, if not you can use the included ground screw to make your own ground, but that should do it for the review on this Curt T-Connector Vehicle Wiring Harness for the factory four-way tow package..

Ratings & Reviews

4.7

14 reviews
Review sort icon
Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into OEM tow package wiring harness - no cutting, splicing or tapping required.

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Fit perfectly easy install



by:

Haven't used it yet, but looks easy to use. Was shipped quickly.



by:

The hitch was exactly what I ordered and it fit great!



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Excellent



by:

Very good fast delivery and right on the money its perfect . thank you for the prompted sevice



by:

Just as described

Mike L. profile picture

Mike L.

2/5/2018

As to checking up with my purchase ! Kudos! As to the product I purchase, I have yet to find fault in it, does as it suppose to.



by:

Wiring needs to be a heavier gauge, other than that it's plug and play.



by:

This was a very pleasant purchase. Product was shipped quickly and I was kept informed of the status of the order. Will be using etrailer.com for future needs.



by:

Easy to install. I had to drop the spare tire to get the connection for the harness, yet worked instantly once lugged in. As usual you guys are awesome to shop with.



by:

The connector clicked in very nicely. I was replacing a broken factory 4-flat connector, so i unwrapped and cut off the existing wires from the factory connector, snapped this guy in place, re-wrapped it and zip tied it up. If it weren't 35 degrees and windy i would've been done in 15 minutes!



by:

Great trailer harness! It really helped me get out of a jam when my factory harness went toes up! Thanks



by:

Stacy was very helpful, keep me informed about order status and delivery. She got me the right wire harness after I ordered the wrong one. Haven't been able to get it put in, temperatures are in the upper 90's


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

  • 4-Way Trailer Wiring Recommendation for the 2001 Ford F-150
    Yes, the Curt T-Connector Vehicle Wiring Harness # C55256 that you referenced would work well on your 2001 Ford F-150 and would simply plug inline with the connectors in the picture you sent us. You will need to ground the white wire of this harness as well for it to work properly.
    view full answer...
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  • Trailer Wiring Harness for a 2001 Ford F-150
    A connector that has pins in both ends would not be able to plug into anything. Its like a wall outlet, the female end has the slots for the prongs and hole for the ground and the male end has the prongs. All T-connector harnesses work this way. It sounds like you might be talking about a harness that plugs in line with the tail light wiring and has not 2 but 4 connectors total. If your truck did not come with a factory tow package then there would be no where to plug in harness C55256...
    view full answer...
  • Wiring Harness Fit for 1999 Ford F-150 Light Duty
    For your 1999 Ford F-150 LD, I recommend the Curt Custom Fit Vehicle Wiring # C55256. This wiring harness will plug into your wiring on the drivers side frame, near the rear bumper. If you only have one plug under your truck, you can tape up the unused plug with electric tape to protect the connection.
    view full answer...
  • Replacement Wiring Harness for 1999 Ford F-250 Light Duty Truck
    If your 1999 Ford F-250 Light Duty truck came equipped with a factory 4-way, you will need the Curt T-Connector Vehicle Wiring Harness, # C55256, to replace your wiring harness. To upgrade a factory 4-way to a 7-way connector, you can use the Tow Ready Custom Fit Vehicle Wiring, # 118242. Finally, if your truck is equipped with a factory 7-way you will want to go with the Tow Ready Replacement Multi-Tow 7-Way and 4 Pole Trailer Connector, # 74682. The wiring harnesses for the Super Duty...
    view full answer...


Info for this part was:

Employee Leah B
Edited by:
Leah B
Employee Lindsey S
Written by:
Lindsey S
Employee Michael H
Expert Research:
Michael H
Employee Jeff D
Installed by:
Jeff D
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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