bing tracking image
  1. Custom Fit Vehicle Wiring
  2. Chevrolet
  3. Tahoe
  4. 2018
  5. CURT
FITS 2018 Chevrolet Tahoe
Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way and 4-Pole Flat Connectors

Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way and 4-Pole Flat Connectors

Item # C55774
Our Price: $27.58
You Save: 48%
Custom Fit Vehicle Wiring
Confirmed to Fit
2018 Chevrolet Tahoe

Will this fit?

To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.

Shipping Weight: 1.28 lbs
Add to cart
In Stock
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Customer Photos

Need help with installation?
Locate installers near me
The best technical support and full custom fit vehicle wiring installation instructions. Great price Tahoe custom fit vehicle wiring and expert service. Chevrolet Tahoe, 2018 custom fit vehicle wiring by CURT are available from For expert service call 1-800-940-8924 to order your Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way and 4-Pole Flat Connectors part number C55774, or order online at
  • All Info
  • Reviews (594)
  • Q & A (0)
  • Photos

2018 Chevrolet Tahoe - Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way and 4-Pole Flat Connectors

  • Trailer Hitch Wiring
  • 4 Flat
  • 7 Round - Blade
  • No Converter
  • CURT

Quickly and easily install a 7-way and a 4-way trailer connector on your Chevrolet Tahoe with this custom harness. Connector plugs directly into OEM tow package wiring harness - no cutting, splicing or tapping required.


  • Provides both a 7-way RV-style and a 4-pole flat trailer connector at the back of your vehicle to power your trailer's signal lights
    • Designed for use with a factory tow package
    • Compatible with 5-pole and 6-pole adapters (sold separately)
  • Connects quickly and easily - no cutting or splicing of wires
    • Locate connection point behind rear bumper
    • Plug in connector
  • Includes mounting bracket and hardware
  • Comes with protective covers for connectors
  • Assembled in the USA
  • Limited 1-year warranty


This custom-fit connector plugs into your vehicle's factory tow package wiring harness, which is located behind the rear bumper, on the driver's side.

Once installation is complete, the connectors will be stowed beneath your vehicle, near the trailer hitch. A mounting bracket is included to keep the connectors secure.

It is recommended that you use a small amount of grease on all electrical connections - the plug on your automobile and the 7-pole and 4-pole connectors - to help prevent corrosion.

55774 Curt T-Connector - OE Multi-Socket Upgrade

Installation Details C55774 Installation instructions

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way and 4-Pole Flat Connectors - C55774

Average Customer Rating:  4.7 out of 5 stars   (593 Customer Reviews)

Quickly and easily install a 7-way and a 4-way trailer connector on your vehicle with this custom harness. Connector plugs directly into OEM tow package wiring harness - no cutting, splicing or tapping required.

2010 Chevrolet Silverado

Very easy, plugged right into the uscar connector, drilled 2 holes for the bracket, done

2003 GMC Yukon XL

I am having a problem with the install of the three Curt trailer components I purchased. I intentionally bought all of the same brand assuming that they would work together. The problem is that the Curt wiring harness (part# C55774) is too long and rigid. When the 7-pin connector is installed in the bracket that comes with it, it measure 5 inches until the black wire protective sleeve bends (to go under the hitch receiver frame).

The no-drill bracket (part# C57202) is supposed to attach the harness bracket to the hitch. But it is only 6.5" long, and the hitch tube is 3" wide. So with the bracket attached to the hitch, there is only 3.5" of space left to mount the harness bracket so that the screw holes line up.

I am disappointed that this is the case, especially as I called etrailer to check that the parts I was ordering would work together.

It looks like I will have to discard C57202 and drill two holes into the bottom of the hitch and mount the harness bracket directly. This is what I wanted to avoid - having to drill holes.

Etrailer Expert

Heather A.


The 7-way bracket that comes with the wiring harness part # C55774 is designed to be installed with the wiring harness bracket hanging below the no drill bracket part # C57202. Since you are worried about the loose wiring I would recommend using some wire loom such as part # 459075-1 to protect your wiring and zip tie any slack with zip ties part # DW05726-25. I know this is not the option you wanted but I feel it is better than drilling into the hitch.

2015 Jeep Grand Cherokee

Super easy, very nice! Great engineering, couldn’t have been any easier! The girls at etrailer are super friendly and very helpful! Great prices and quick shipping, too!!



Great. No problems.

2003 Mercury Mountaineer

This was supposed to be a plug in installation for my 2003 Mercury Mountaineer. No it wasn't. Completely different connector, and the wiring was 2 feet too short. Was able to use it after a bit of clipping and splicing.


Perfect fit. My truck was not equipped with a tow package so I was a little worried it wouldn’t fit. The wiring and plug were already there with a cap on it to seal it from dirt/water. Took the cap off and this harness snapped right in place. Also installed an etrailer hitch and new bumper. Very happy with the products and the installer tools and information provided by

2023 Honda Passport

Bought this because of the split 4 pin and 7 pin connectors. I’ve had so many 7 pin to 4 pin adaptors and would forget that I let my son or son in-law use it and had to buy another one when I needed it. This will stop me from the need to buy another adaptor, good for me not good for my son and son in-law when they come over to borrow the trailer. LOL, who am I kidding I’ll still go with them to the store and buy another one.


Harness was easy to install. The truck came prewired. It just needed the adapter. We dremeled our the back of the bumper (2019 Titan’s have the cut our outlined on the back side already). We had to dremel 2 side prices off the harness, but it slide right now. Then we drilled through the plastics bumper cover and the metal on the bumper and bolted the bracket to the bumper.

The 4 point is just fished between the license plate and the bumper. It was easy and it now looks factory. Very happy with how it came out! Install was a cinch!

2018 Nissan Titan

I have a 2018 Nissan Titan, and while the connector was a perfect fit for connectivity to the factory connector. The Curt T-Connector wiring harness was about 6 inches short from connecting to the factory harness when mounted on the trailer hitch bracket. So, I was forced to mount it on the opposite side by drilling holes in bumper.


The actual trailer hitch was fine but the wiring kit was not the right kind. When I called to get a return authorization I was told that more than one half the cost of wiring kit will be deducted from my return for postage. I have never had to pay for returns to any company before. I will not be recommending your company


If you have multiple trailers that either use a 4-way flat or 7-pin round connector and get tried of having to use an adapter go with this setup. I've had one on my other truck for a couple years and no problems with 'em thus far. You can technically use the old existing mount on the receiver hitch itself but the 4-way will dangle unless you ziptie it up.

2002 Ford Excursion

My 2002 Ford Excursion 7.3L diesel had the original factory hitch and wiring harness. The quality and heft of the Curt T-Connector is impressive. I bet I get years of use without problems.

2007 Ford F-150

Great product & customer service

2005 GMC Yukon XL

I like how it has both 7-way and the 4 pole connectors. Looks nice too!


Plugged right in and makes for a professional look


Great fitment. Had a little difficulty getting to the right version of this but the amazing customer service at ETrailer helped me get to the correct one. Thank y’all! I love any business that’s not named after a rain forrest!


Great product. Installed on my 2018 Jeep GC. Because of dual 4 pin and 7 pin connector I don’t need an adaptor when swapping out trailers/camper. Clean look to it as well.

2017 Nissan Titan XD

There was no place on the new hitch to bolt the end to, which was a disappointment. For now I sip tied the end to the hitch in an area where it does not move.


Easy to install. Holds up really well. Installed 2.5 years ago. Holding up well after towing boats, trailers and campers in all types of weather conditions.


Yeah etrailer did a wonderful job designing the complete towing system for my 2014 Jeep grand Cherokee. One for size pick up trucks are towing their travel trailers with their back and hanging down my grand Cherokee rides level.
I installed the entire system myself without too much difficulty. The only thing that had me baffled was the lights would not work because I did not know that you had to take the grand Cherokee to the dealership and have them reprogram the computer to “tow”.
Thank you!!

1999 Ford F-250 and F-350 Super Duty

Top Quality! Fast Delivery! Have ordered several items from etrailer and have never been disappointed!


Fast delivery. Great help on the counter. I will definitely recommend ETRAILER to my friends. Thanks.

2004 Cadillac Escalade

Product just like it said it does, delivery just took long but is free delivery so is good, packed box came like bit out from the people delivered but localy everything works good


The original trailer plug wasn’t going to work with the hitch I purchased this was recommended on web site for the hitch I purchased it was a very simple change over all wiring and plugs matched the unit mounted securely to the plate on hitch plugged traikeyinbwhen complete and everything worked fine great product



Working great and easy to install


Purchased a 7 pin trailer connector for a Ford pickup. Was sent one that was supposed to be a perfect fit. It was not. I asked for a refund. Was asked to send pictures. etrailer disapproved my request even though the pictures showed that what they sent me was too short to fit. I will not ever purchase anything from this company again.

Nissan Titan

The wiring harness connected fine to the Nissan Titan 7 pin plug. I used hose clamps to mount the new 7/4 pin. Only issue was I discover I need the relay kit to enable the brake and turn signal to function all the trailer lights.



I am very happy with the combo 47 wiring connector. I use both the 4 pin and the 7 pin and they work fine.

Show More Reviews

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

< Previous
123. . .15

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

Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Andrew K
Video by:
Andrew K
Employee Joshua S
Video by:
Joshua S
Employee Dustin K
Video by:
Dustin K
Employee Michael B
Video by:
Michael B
Employee Lindsey S
Written by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Jacob T
Video Edited:
Jacob T
Employee Chris R
Video Edited:
Chris R
Employee Wilson B
Updated by:
Wilson B
Employee Kristina F
Updated by:
Kristina F
Employee Isabelle B
Updated by:
Isabelle B
Employee Noah M
Updated by:
Noah M
Employee Brent H
Test Fit:
Brent H
Employee Shane H
Test Fit:
Shane H
Employee David F
Test Fit:
David F

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.