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  1. Custom Fit Vehicle Wiring
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FITS 2018 Nissan Frontier
Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

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

Item # C56225
Retail:$87.01
Our Price: $61.83
You Save: 29%
Custom Fit Vehicle Wiring
Confirmed to Fit
2018 Nissan Frontier

without factory trailer connector

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The best technical support and full custom fit vehicle wiring installation instructions. Great price Frontier custom fit vehicle wiring and expert service. Nissan Frontier, 2018 custom fit vehicle wiring by CURT are available from etrailer.com. For expert service call 1-800-940-8924 to order your Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part number C56225, or order online at etrailer.com.
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2018 Nissan Frontier - Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

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

Quickly and easily install a 4-way trailer connector on your Nissan Frontier with this custom harness. T-connector plugs directly into existing wiring. Required relays included.


Features:

  • 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 12-pin wiring harness behind passenger's-side kick panel
    • Insert harness with relays (included) into 12-pin connector
    • Locate factory harness connection point behind driver's side rear bumper
    • Plug in connector
  • Comes with dust cap for 4-way flat connector
  • Limited 1-year warranty


Installation

Location of 12 pin connector

This custom-fit T-One connector plugs into your vehicle's 12-pin wiring harness located behind the passenger's-side kick panel.


Location of OEM connector

Once you've plugged in the 12-pin connector, plug the 4-way harness in beneath the vehicle, behind the driver's side rear bumper


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 plug on your automobile and the 4-pole connector itself - to help prevent corrosion.



56225 Curt T-Connector - 4 Wire

Compare to Tekonsha 118525

Installation Details C56225 Installation instructions

California residents: click here


Customer Satisfaction Score:


Customer Reviews

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - C56225

Average Customer Rating:  4.8 out of 5 stars   (407 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. Required relays included.

by:

I got this because I needed to haul a trailer for one time and of course I can have it for future hauling. It was easy to install and works great. The only reason I am giving it 4 stars is I wish it had the little flip cover you can put on your bumper area to make it look like a outlet cover as right now I have to hide my wiring hanging under the bumper.



by:

The blue connectors will not fully seat. This is the second set that i cannot get them to seat all the way.

Etrailer Expert

Katrina D.

3/6/2024

Oh, that is not good to hear. You will want to start by removing the relays and verify that the pins aren't bent and/or that there is no debris inside the connectors. If you are still having issues after you have checked the pins, please let me know.



by:

Great service. Fast, good products, excellent installation instructions and videos.



by:

10 minutes it was installed all trailer lights are working



by:
2012 Nissan Xterra

Great wiring harness. I had to return it though, as it turned out I was already factory pre wired. My bad for not looking closer.
etrailer happily helped me return it, and I ordered just the 4 pole wiring harness. Great customer service - I love working with etrailer.



by:

Worked just fine. A bit combersom to get to the connector, but I'm happy.



by:
2008 Toyota Highlander

Ordered this by mistake. Shold have crawled around under the vehicle more before orderinhg. The one I installed on my Toyota Highlander workded perfectly, however.



by:
2023 NissanFrontier

Easy to put relays in. Located behind passenger kick plate. I wrapped them in fabric so they would not bounce around. 4 prong easily plugs into connector on Driver's side on frame near bumper. May need a long nose pliers and a regular pliers to pull the protective plug out.



by:

The relays don't fully snap into the wire harness. They do function just fine. As it gets older (as a rule) with summer heat plastic changes. I see it being an issue where the relays are stuck on the harness too much.



by:

The patch cable Curt T-Connector seems to be made well. I have not installed. It was shipped and and received in a timely manner. If the review came a few days later, I could possibly provide an excellent rating.



by:
2007 Nissan Xterra

Fast delivery and perfect fit!

Duane

6/3/2024

Still working great, Wished I had bought it earlier.



by:

Easy, easy, easy!
It would have been
nice if plastic sheathing had came with the 4 way harness, but luckily I had some to dress it out.



by:

Connects perfectly with the stock wiring. Looks factory. Good product to have if your Xterra didn’t come with a tow package



by:

Excellent product delivered ahead of schedule with clear directions and videos to support installation.



by:

Always good results from etrailer with your instructions and videos can't go wrong.



by:

This was a simple install. I’ve done some before where you actually tap into wire harnesses. This kit is truly plug and play! Awesome kit!



by:

provided everything I needed and more. It was securely packaged and in mint condition. I will be able to tow my trailer legally when it's dark.



by:
2019 NissanFrontier

I received my hitch and wiring harness kit for my 2019 Frontier within a few days after ordering. The items were well packaged, and nothing was damaged. The install instructions/video on your website were spot on. I had the whole thing installed and ready to go in less than an hour. Fit and finish of the etrailer hitch is very nice for the price. I would definitely recommend etrailer.com to others.



by:
2016 NissanFrontier

Easy installation... the online videos really helped.
I had an existing harness that was installed with the hitch and the running lights were not working and the shop couldn't figure out the problem!
I removed the passenger side panel and saw the relays were missing. I decided to just tackle the fix myself and it worked out great.



by:

Great product! Wish I'd bought this first.
I wasted alot of time trying to get running lights on my Nissan Xterra pigtail. I had brake and turn signal only. Excellent customer service- Molly solved problem with this harness. Best of all - she saved me over $200.00 that Nissan wanted just to diagnose problem. If I can install this, anyone can. It only took 10 minutes and I had running lights.
Thank you



by:

1/2 the cost of Nissan!



by:
2019 NissanFrontier

So far I've received and checked out the parts ordered. They arrived promptly and seem to be of excellent quality. Instructions enclosed seem adequate and I'm looking forward to a straight forward installation.



by:
2015 Nissan Xterra

great deal fast ship



by:

Good product fast delivery



by:
2015 Nissan Xterra

Very simple install, plug and play electrical connections, very simple to use and very good quality product. Very happy it was put on in PA on Friday afternoon and hauled a uhal trailer to GA Saturday morning. Had 0 issues. Definitely a 5 star rating


25
407
Show More Reviews

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

  • Recommended Trailer Hitch And Wiring For A 2022 Nissan Frontier
    For your 2022 Nissan Frontier, I recommend Wiring Harness # C56225. As far as a hitch goes we do have a few options for your truck, however, I recommend one of best sellers, the etrailer Trailer Hitch Receiver # e98869. This is a custom made class III hitch designed specifically to fit your 2022 Frontier.
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    The Curt wiring harness # C56225 is not confirmed to fit the 2023 models of the Nissan Frontier, but do I have two options for you to choose from though. Option 1: The T-One Vehicle Wiring Harness with 7-Way Trailer Connector # 118266. This wiring harness is completely plug-in so you won't have to hardwire anything, but it doesn't come with a 4-pole connector so you would need to use an adapter like # 47345. Option 2: The Curt Powered Tail Light Converter with 4-Pole Flat Trailer Connector...
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    If your 2010 Nissan Frontier came with the factory tow package that includes a 7-Way trailer connector then you would not need any additional relays unless the factory left them out for some reason. You can check the vehicle owners manual for the fuses/relays related to the tow package wiring and brake controller to determine if they are present. If they are not present use # C57000. If your Frontier did not come with the factory tow package then you will need to hardwire in a brake controller...
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    You are definitely on the right track. It sounds like you did install a wiring harness and relays like part # C56225. If those relays have been installed all you would need is the part # HM43534 that you referenced. This will plug right in and give you both a 7-way and 4- pin connector. For operating electric brakes you will also need a brake controller. I recommend the Tekonsha prodigy P3 part # 90195. This is a great all around controller and gives you pully proportional braking. Large...
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  • Are Curt 4-Way Relays Compatible With Hopkins 7-Way on 2017 Nissan Frontier
    The relays for the Curt # C56225 on your 2017 Nissan Frontier are the same as the ones that come with the Curt 7-Way # C56226. Since you already have the 7-way functionality from the relays that came with your 4-way you will be able to install and use the Hopkins # HM43534 without the need for additional parts.
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  • Parts Needed for 2023 Nissan Frontier to Tow Trailer With Brakes
    Towing a trailer with brakes will require adding a 7-way along with a brake controller. Since you were already looking at 4-way wiring I'm assuming there is no factory trailer connector on his 2023 Nissan Frontier. All you will need to add a 7-way is the Curt T-Connector Vehicle Wiring Harness # C56226. The brakes and the lights aren't tied to the same wires but the 7-way will take care of powering all your lights along with sending power to the brakes. For a brake controller, I recommend...
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    I have a solution for you, but I was able to determine from my research that the 2006 Nissan Xterra roof has a capacity of 150-lbs, so adding a kayak carrier and 2 kayaks that weigh 85-lbs each would put you over capacity of your roof. Your best solution for carrying kayaks of that length and weight would be using a kayak trailer like the Malone EcoLight # MAL43FR, which comes with extra wide kayak carriers that will fit a variety of different style boats. If you don't already have a...
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  • Can The 4-Way Curt Harness Be Upgraded to 7-Way on a 2011 Nissan Xterra?
    If you already installed the 4-Way Curt Wiring Harness # C56225 on your 2011 Nissan Xterra, you will only need the Replacement Wiring Harness # 118267. You will not need the full 7-Way T-One Vehicle Wiring Harness # 118266 as you already have the relays needed from the 4-way harness. You will need a Mounting Bracket # PK12711U for the 7-way connector.
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  • Availability of Trailer Wiring Harness for 2014 Nissan Frontier
    I spoke with my contact in the Tech Services department at Tow Ready. He tells me that they have recently determined that the # C56225 Curt Wiring Harness carries over to the 2014 Frontier models. The kit includes the 4-pole connector that plugs into the connector on the drivers side frame rail alongside the spare tire and the jumper and relays to activate the factory tow package. The relays and jumper plug into a connector located behind the toe kick in the passenger-side foot well as...
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  • Troubleshooting Running Lights with Curt Trailer Wiring Harness C56225 for 2009 Nissan Frontier
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Notes: May have damaged packaging or minor cosmetic blemishes.

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