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  1. Custom Fit Vehicle Wiring
  2. CURT
  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 4 Flat
  6. No Converter
Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

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

Our Price: $17.72
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Custom Fit Vehicle Wiring

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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 - no cutting, splicing or tapping required. 1-636-306-4830 to order CURT custom fit vehicle wiring part number C55315 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 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
  • All Info
  • Reviews (39)
  • Q & A (0)
  • Photos
  • Why etrailer?

CURT Custom Fit Vehicle Wiring

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • No Converter
  • CURT

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring - no cutting, splicing or tapping required.


  • 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 - no cutting or splicing of wires
    • Locate connection points behind rear bumper
    • Plug in T-connector
  • Comes with dust cap for 4-way flat connector
  • Limited 1-year warranty


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

Once installation is complete, the 4-way 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 4-pole connector itself - to help prevent corrosion.

55315 CURT T-Connector - 4 Wire

Item # C55315

Installation Details C55315 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - C55315

Average Customer Rating:  4.8 out of 5 stars   (39 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring - no cutting, splicing or tapping required.


I needed the extra wiring to ensure a solid fit, everything was plug and play great job!

1990 GMC C/K Series Pickup

Very easy to install. Immediate shipment. Better than bargain price. Well thought out design.

Works great. My 9 year old son wired it up for me with little supervision. Still works great after a years worth of hauling. No blown fuses.
Micah - 05/18/2022

1993 GMC C/K Series Pickup

Great product. Matched up exactly with the OEM wiring on my truck. Easiest trailer wiring harness I've ever used. Took all of 5 minutes to install. Quality looks great, should last for years.


The harness got salt in the connector prongs and started rusting and I went to pull them apart to hook up a trailer and the prongs broke off same thing happens the first time I ordered one.


This rear bumper wiring harness allowed me to replace the original harness that had been butchered by no-strip squeeze connector that had rotted the wires.
Absolutely worth buying.


Product installation was super easy.
plug in and go.
No wire nuts or flimsy connectors that are just a source of corrosion.

1996 Chevrolet C/K Series Pickup

I needed to wire up a flat bed lights. I wanted to find a plug to plug right into the stock plug.

This was exactly what I need to complete the project.

1997 GMC C/K Series Pickup

The wireing and connecter ' s are well made and the assembly is simple and straight forward. The ground screw isn't suitable for frame rail , I drilled 3/32 as recommended but screw broke.i went ahead and drilled to 1/4 and bolted ground wire. Delivery was ok except usps dropped the ball as usual. Good product will use them again.


Excellent product. Super simple and perfectly made. Great compliment to my excellent new hitch from E trailer.


excellent service

1997 Chevrolet C/K Series Pickup

Great wiring kit, just as the description and picture shows. Have yet to install but looked at the existing wiring and will match up perfectly.


Works great , Etrailer has everything and the prices are great to


Works perfect, plug in and go!

1992 Chevrolet C/K Series Pickup

Easy to install and works like a charm

1994 Chevrolet C/K Series Pickup

Fit perfectly, works great!

1996 Chevrolet C/K Series Pickup


Great thanks
Franz H - 05/24/2018


Very good quality parts!


Good product. Thanks


Plug and play. No worries.

1997 GMC C/K Series Pickup

Fast shipping and great quality parts highly recommended

1998 chevrolet c/k series pickup

Awesome product! I just received mine and had it on my truck in 5 minutes. It works exactly as its listed on the website!


mucho bueno great.....!



1990 Chevrolet C/K Series Pickup

Does what it says

Show More Reviews

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

  • Trailer Wiring Recommendation for a 1989 GMC Sierra Truck
    For your 1989 GMC Sierra truck you would want the Curt Wiring Harness part # C55315 as trailer wiring as it has been confirmed to fit your vehicle.
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  • How to Add Secondary 4-Pole Wiring Harness to 2012 Ram 1500 to Power Lighted Hitch Cover
    You can use the Curt T-Connector 4-Pole wiring harness # C55384 plugged in at the back of your existing factory connector to provide a 4-pole plug for your lighted hitch cover. This harness connects inline between the existing connector and the factory wiring. The factory connector at the bumper remains active.
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  • How Can I Connect My Lancer Camper To My 1991 GMC C/K Series Pickup
    The Lance camper has a proprietary connector. If you want to connect to your 1991 GMC C/K Series Pickup and not have to get a connector from Lance, you will have to replace that camper connector. That can be done with the Pollak Black Plastic, 7-Pole, RV-Style Trailer Connector - Trailer End, part # PK12706. You will need to have a 7-way connector installed on your pickup. You will need the 4-way installed first. I recommend the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat...
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  • Recommended Trailer Hitch Receiver For 1990 Chevy C10 Single Cab
    I'm going to assume you have the standard or step bumper on your 1990 Chevy C10 Single Cab, and the hitch I recommend for your truck is an option from Draw-Tite: - Draw-Tite Max-E-Loader Trailer Hitch Receiver # 41524 I like the # 41524 the most for your '90 Chevy C10 because unlike most hitches for your Single Cab it does not require any drilling into the frame to install. It also has a solid 6,000 lb towing and 600 lb tongue weight capacity but that jumps to 10,000 lbs towing and 1,000...
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  • 4-Way Trailer Wiring Connector Recommendation for a 1988 Chevy Silverado
    I have a much easier solution for installing a 4-way on your 1988 Chevy Silverado 1500. What you would want would be the part # C55315. This plugs inline with the taillight connector on your truck and does not require any hardwiring. Otherwise you would need to test the wiring of your truck taillights with a circuit tester like part # PTW2993 to wire the 4-way you currently have to it. White wire would get grounded, brown wire runs to the wire that comes on with the running/head lights,...
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  • Gooseneck Hitch and Wiring Recommendation for a 1994 GMC 2500 Truck
    The gooseneck hitch we offer with the best price that is confirmed to fit your 1994 GMC 2500 truck would be the Reese Fold-Down Gooseneck Trailer Hitch with Installation Kit # 8339-4440. I attached a link to the installation instructions for you to check out. For trailer lighting let's start with a 4-way, you may already have one. But in case you do not you would want the Curt Wiring part # C55315. Now to convert this to a 7-way you would want the Brake Controller installation kit part...
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    If the 4-way trailer connector you have on the back of your 1994 Chevrolet truck needs to be replaced use Curt # C55315. There will be a connector under the rear of the truck on the driver's side to install the harness. Once you have the 4-way connector you can use our # ETBC7 kit to install the 7-way and everything you'll need for the brake controller. The Curt TriFlex Brake Controller # C51140 will hardwire in using the adapter # C51515. I've linked a video showing the TriFlex installed...
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  • Recommended Trailer Hitch for 1991 Chevrolet K2500 with a Regular Bumper and a 8600 GVW Package
    My contact at Curt said that the 8600 GVW package will not affect how the Curt Trailer Hitch # C15325 fits on your 1991 Chevrolet K2500. I recommend using this hitch because of how well Curt manufactures their hitches. The max Gross Towing Weight for this hitch is 16,000 lbs and the max Tongue Weight is 2,400 lbs. Keep in mind that you will need to know your vehicle's towing weight capacity. If your vehicle's towing weight capacity is less than the Gross Towing Weight of the hitch, then...
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  • Heavy Duty Trailer Hitch Receivers For 1989 Chevrolet C/K Crew Cab Pickup
    I cannot determine which rear bumper that you have from your picture so I will give you to options based on which bumper you have on your 1989 Chevrolet K3500 Crew Cab Pickup with the 8' bed. The Draw-Tite Ultra Frame Trailer Hitch Receiver # 41947 is designed to fit your Chevrolet with the standard or step bumper. This class V receiver is capable of towing 15,000lbs or 16,000lbs if you use a weight distribution hitch. The tongue weight rating is 1,600lbs for either style hitch or hitch...
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  • Wiring Kit For Installing A Brake Controller On a 1997 Chevrolet C/K1500 Truck
    The Curt Universal Installation Kit # C57186 is universal and will work on your 1997 Chevrolet Silverado 1500. It does not have a mounting bracket for the 7-way and will require you to already have a 4-way Trailer Connection # C55315. I recommend using the Universal Installation Kit for Trailer Brake Controller # ETBC7. Our kit will include the mounting bracket for the 7-way and on the trailer connector there is a separate connector for 4-way trailers. This means that you will not need...
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  • Installing a Hopkins Agility Brake Controller on a 1998 Chevrolet Pickup
    We have everything that you need to install your Hopkins Agility Brake Controller, # HM47294, on your 1998 Chevrolet truck. The installation process is going to depend on how your truck is currently equipped. If your truck has no trailer wiring at all, then you will need a few different components. First, you will need 4-way flat trailer connector. For this, I recommend the Curt T-Connector Harness, # C55315. This harness will plug into the factory connector located on the driver side...
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  • Parts Needed to Install Brake Controller on 1993 Chevy C/K Series Truck
    You're certainly on the right track, with a small exception or two. Instead of getting the # 37185, I'd get the # ETBC7 Brake Controller Install Kit. The kit includes the # 37185, plus all the hardware, wire and circuit breakers you'll need to complete the install. As for your brake controller choice, the # 39510 Voyager brake controller would be a good choice if you're very familiar with using and troubleshooting brake controllers. The Voyager doesn't use a digital display, and it's...
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Info for this part was:

Employee Adam R
Expert Research:
Adam R
Employee Cole B
Installed by:
Cole B
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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