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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

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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. Call 800-298-1624 to order CURT custom fit vehicle wiring part number C56172 or order online at etrailer.com. 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.
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  • Reviews (355)
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  • 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.


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 connection points at the rear, on the passenger's side
    • Plug in T-connector
  • Comes with dust cap for 4-way flat connector
  • Limited 1-year warranty


Installation

This custom-fit T-connector plugs into your vehicle's wiring harness, which is located beneath the rear of your vehicle, on the passenger's side.


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.



56172 CURT T-Connector - 4 Wire

Item # C56172

Installation Details C56172 Installation instructions

This Product Fits The Following Vehicles



California residents: click here



Customer Reviews

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - C56172

Average Customer Rating:  4.9 out of 5 stars   (355 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.

- C56172
by:

Very easy installation. Plugs into the OEM wiring system. Bought item with the Draw tite hitch (76034) and curt mounting bracket (C42CR). Primaryuse is to power my Curt LED auxiliary LED light on my bike rack and flexibility power trailer lights as needed. Used recently to tow a trailer on a long trip with zero issues.


Comments
1yr review, No issues and still works as designed.
Javi - 03/10/2022


- C56172
by:

Really like the way the Curt trailer hitch receiver looks on my 2017 Explorer. Class III receiver should be adequate for my 19’ center console boat. Thanks.



- C56172
by:
2014 Ford Explorer

etrailer has become my go-to source for towing-related products. Last year I bought a custom Curt receiver hitch and wiring kit for my 2014 Ford Explorer. Great product, easy installation for both. This wasn't a surprise, because prior to this purchase, I bought a custom Curt receiver hitch and wiring kit for my 2012 Ford Taurus with equally positive results. I did both installations myself.


Comments
Love it! Two receivers and two wiring kits. I know where to shop with confidence.
Mark B - 07/24/2018



- C56172
by:

Glad I purchased this easy to install wiring harness.



- C56172
by:

I purchased a trailer hitch as well as the harness. It took me about an hour to install the hitch ( by myself ) and the harness about 5 minutes. The quality of the product was only exceeded by your customer service representative Autumn. Very impressive!



- C56172
by:
2019 Ford Explorer

I have purchased two different trailer hitches and wiring harnesses for two separate vehicles from etrailer.com; one for a 2019 Toyota Camry and one for a 2013 Ford Explorer. The installation of the hitches went totally without incident as did the wiring harnesses. The combination of directions and videos made both installations a real easy job. I commend etrailer.com for doing their homework. I would and have highly recommend etrailer.com products to anyone. In fact, the hitch/harness for the 2013 Ford I installed was for the priest of our parish. As for customer service again, it is second to none. Stacey A (my contact) was extremely professional, knowledgable, and helpful. Thank you etrailer.com for your superior products and service. -Ron-



- C56172
by:

Decent quality, fast shipping



- C56172
by:
2017 Ford Explorer

Wiring harness fit perfect on my 2017 Ford Explorer. Easy to install



- C56172
by:

Watched the instruction video and installing the harness was a breeze!



- C56172
by:

Plug and play - what can you say.



- C56172
by:

Got here a lot faster than I expected installed pretty easy and looks good really appreciate you guys thank you I will definitely do more business with you in the future



- C56172
by:

Wire harness was a great purchase and connected well.



- C56172
by:

The entire process from looking up my hitch and wiring online, to speaking with the Knowledgeable staff to place my order, then to receiving it, was a smooth process! Then the helpful videos on how to install was great!!! Never have I done business with a company that takes great care of their customers!! I will definetly be a returning customer!



- C56172
by:

Product fit just like it should.



- C56172
by:
2018 Ford Explorer

Easy install and did the job



- C56172
by:
2018 Ford Explorer

Plug and play. Doesn't get any easier of an install than this.



- C56172
by:
2016 Ford Explorer

FROM START TO FINISH , ALL WENT SMOOTH AS SILK , HAVE MADE A FEW ORDERS IN THE PAST, NOW LET ME GO PULL MY TRAILER LOL



- C56172
by:
2014 Ford Explorer

This is the most awesome product out there for the DIY or professional. Ease of use and installation would be an understatement. The videos you supply online are simply priceless.. Took me longer to try and get grounding wire secured than it did to connect the wire harness and install the trailer hitch. Just no room in wheel compartment to get my probably out dated drill. Only glitch I had was the zip ties were too short to go around the trailer hitch tube and the wiring harness. Luckily I have plenty in work shop.


Comments
Ran into the exact same problem with the grounding screw.Took me over an hour to figure out how to get my drill in there. Eventually lowered my mufflers which made it slightly easier.
-- comment by: Jarett P - 09/03/2014


- C56172
by:
2015 Ford Explorer

I installed this wiring harness on my daughter's 2015 Ford Explorer. It was a simple fit. Just pull off the protective cover on the car's wiring and plug this in. Route the wires along the receiver hitch and secure with zip ties. Done!! Works perfectly from the start.


Comments
One year later and its still working just as good as day one!
Skeeter66 - 12/05/2017



- C56172
by:

Perfect assembly, very easy install. Made me feel smart and I am definitely not a car guy. Just a guy with a breaker bar and a desire for towing package.



- C56172
by:

Fits great. The only hard part was separating the factory connector. After fighting it for about a half hour, I took a blow gun and blew air into the joint. It then separated easily.



- C56172
by:

Easy plug and play connectivity. Added some dielectric grease to the connections before install.



- C56172
by:

Same day order processing. Delivered on time. Installation was a breeze. I was very pleasantly surprised to see just how easy installation was. The only issue I ran into was the zip ties supplied with the harness were too short to go around the hitch bar itself. If I didn't have longer zip ties doubling them up would have worked fine.


Comments
No complaints here.
Green - 03/21/2018



- C56172
by:
2013 Ford Explorer

SUPER EASY! I have a 2013 Ford Explorer XLT without the tow package, and this device tests out fine, and works great. Installed in about 30 seconds. It took longer to drill the grounding screw and tie down the cords than it did to install. It was as simple as pinch and open, plug in one side, plug in the other side. When you hear a click on both plugs you're done. The videos on this product were perfect, exactly what I needed to see. Others have said that there were issues with the backup sensor after installing this device, but I have not noticed any difference in the back up camera or back up sensor.


Comments
I dont have the tow package either. When I watch the installation video it looks like there are actually two wiring harnesses near the rear passenger side. My vehicle only has one. Would like to know if yours was the same before I order to be sure it will work? TIA for your response.
-- comment by: Tabitha B - 11/05/2014

Comments
My explorer just had one wiring harness, and it works fine.
-- comment by: Brian D - 11/07/2014

Comments
I pulled a car on a tow dolly when I first installed it, but havent pulled any trailers since. At that time it worked perfectly, installed instantly, and worked with U-Haul wiring. I need to pull a trailer soon to move some large items. I have to assume its working fine, but I will let you know after I use it again.
Brian D - 06/03/2015



- C56172
by:
2016 Ford Explorer

Easiest trailer wiring job I ever installed. Just unplug the vehicle harness and put this one in the line. I watched the video first and it made this a simple task. Great product!


Comments
I couldnt be happier!
Ray B - 06/26/2017


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Ask the Experts about this CURT Custom Fit Vehicle Wiring



  • Where Does Curt Trailer Wiring Install on a Base Model 2013 Ford Explorer
    On a 2013 Ford Explorer that did not come with a factory installed 7-Way trailer connector, you can use Curt wiring harness # C56172 that you have referenced. It will install underneath the vehicle at the back on the passengers side. The factory connection point should be behind the rear tire. I have included a link to the installation instructions for you to view. I have also linked a video showing a typical installation of another harness that fits in the same place on your vehicle.
    view full answer...
  • Installing Curt T-Connector # C56172 on 2013 Ford Explorer
    According to my contact in the tech services department at Curt, what we are looking at in your photo is a protective cap placed on the connector. Somewhere near the connector you found, there should be the other half of the connector. You would need to remove the protective cap from each connector, then plug the # C56172 inline between the two connectors. You would then have a functioning 4-pole connector.
    view full answer...
    Image 1 for
  • Curt Custom Fit C56172 Wiring Harness Recommendation for a 2013 Ford Explorer
    The Curt T-Connector Vehicle Wiring Harness # C56172 that you referenced will work on your 2013 Ford Explorer. The single cable you found on the passenger side behind the rear tire will be the connector that you will use. I attached installation instructions that include a picture of the said connector and an installation video for you to check out.
    view full answer...
  • Trailer Wiring Recommendation for a 2014 Ford Explorer
    Yes, the Curt Wiring Harness part # C56172 that you referenced has been confirmed to fit the 2014 Ford Explorers. I attached an install video for this product for you to check out as well.
    view full answer...
  • Will Curt T-Connector # C56172 Work on 2015 Ford Explorer w/ LED Taillights
    The Curt T-Connector wiring harness, you referred to, part # C56172 will indeed work on your 2015 Explorer regardless of the type of taillights the vehicle has. The signal you get out of the connector the T-Connector plugs into is already converted and circuit protected, so there's no need to use a powered converter. You can see an install video by clicking the provided link.
    view full answer...
  • 2016 Ford Interceptor Utility Trailer Wiring Harness Availability
    The Ford Interceptor is based on the Ford Explorer so it is very likely that the Curt wiring harness part # C56172 would fit it. What you can do is check out the install video I attached that shows this harness being installed on a similar 2015 Explorer and then check your vehicle once it arrives to see if the install connectors are there.
    view full answer...
  • Troubleshooting Curt Wiring Harness # C56172 Installed in 2013 Ford Explorer
    You can check your engine compartment fuse box to see if any fuse/relay locations labeled trailer or towing are blown or just missing and install as needed with the value specified. According to my research there are left and right trailer tow relays required; these are installed near the center of the box. The Curt 4-pole wiring harness # C56172 is a confirmed fit for your 2013 Ford Explorer and its installation is shown in the linked video. You need to ensure you have fully seated the...
    view full answer...
  • Does Curt Trailer Wiring Harness C56172 Fit 2014 Ford Explorer without Needing Taillight Converter
    The Curt trailer wiring harness part # C56172 that you referenced is a fit for your 2014 Ford Explorer and does not require any additional converters. It would be a plug and play option that installs very easily. Check out the install video I attached that shows the harness installed in a 2014 Ford Explorer just like yours.
    view full answer...
  • Help Finding Trailer Wiring Connector for Installing 4-Way in 2017 Ford Explorer
    Sound like you found the wrong harness for trailer wiring. The connector should be a rectangular shape and up in the passenger side rear fender. I attached an install video that should help you find it.
    view full answer...
  • Trailer Wiring Harness Recommendation and Install Location for 2018 Ford Explorer
    For trailer wiring for your 2018 Ford Explorer we have the Curt kit part # C56172 which is a confirmed fit. We have an install video for this kit on a similar 2017 Ford Explorer that I attached below for you to check out as well. I attached a picture as well that points out where you'll find the harness on your vehicle too.
    view full answer...
    Image 1 for
  • Difference Between Curt # C56172 and Tekonsha # 118540 T-One Wiring Harnesses
    Both the Curt T-Connector Vehicle Wiring Harness # C56172 and the Tekonsha T-One Harness # 118540 referenced in your question are confirmed to fit the 2011-2018 Ford Explorer. Both harnesses will install the exact same way, by plugging into a built-in port located beneath the rear of the Explorer, on the passenger's side. They will provide you with a 4-Way connector that connects with and powers a trailer's basic signal lights. The only difference between the two harnesses is simply its...
    view full answer...
  • Trailer Wiring Compatibility with 2016 Ford Explorer Police Interceptor
    We install harnesses on many vehicles like the park ranger you mentioned and we have not seen any differences with the wiring harnesses on these Explorer models. I reached out to my tech contact at Tekonsha and he said that it is possible you are trying to connect the harness # 118540 to the incorrect connector because there are two that are very similar on the interceptors. He said there is a black connector and a gray connector that look very similar. The black connector is the one...
    view full answer...
  • Recommended 4-Flat Wiring Harness for 2016 Ford Explorer
    I recommend the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118540 for your 2016 Ford Explorer because of the reliability of the Tekonsha wiring products. You are correct that tit is just a plug-in operation although both ends of the connector must be plugged in at the point you mentioned. I have linked installation videos of both the Tekonsha I recommended as well as the Curt # C56172 being installed on a 2016 Ford Explorer so you can see for yourself the exact...
    view full answer...
  • Trailer Wiring Harness Options for a 2013 Base Ford Explorer
    The Curt Wiring Harness part # C56172 that you referenced will work on your 2013 Ford Explorer base model. This harness installs by plugging inline with your taillight wiring harness. I attached an installation video for this product for you to check out as well. The Curt Wiring Harness part # 56146KIT is a hardwire option for your vehicle. What is nice about this harness is that it draws all the amperage needed to power your trailer lights from the vehicle battery and only uses the taillight...
    view full answer...
  • Trailer Wiring Harness Fit for a 2013 Ford Explorer
    Vehicles frequently have multiple connectors along the frame rail or behind the rear bumper. The functions of these connectors can vary from tow package wiring to backup sensor wiring to tail light wiring. The best way to determine if a plug-in style trailer wiring harness will work on your vehicle is to take the connector apart and compare them to the connectors on the wiring harness. I have attached a photo that shows what the inside of the connectors look like on the Curt T-Connector...
    view full answer...
    Image 1 for
  • Trailer Hitch and Wiring Harness Fits for 2014 Ford Explorer
    All of the 2-inch Class III hitches offered for your 2014 Ford Explorer are indeed bolt-on products that require no drilling or welding for installation. All required installation hardware is included with each one, such as with the Curt # C13386. No fascia trimming is required. An installation video for this hitch on your same model year Explorer is linked for reference along with the written instructions. When you're ready to add a trailer wiring harness you can use part # C56172 which...
    view full answer...
  • Trailer Wiring Harness Fits for 2014 and 2015 Ford Explorers
    Yes, all of the trailer wiring harness products that we offer for the 2014 Ford Explorer are the same as those called for on the 2015 model year. I have linked for you the pages for both vehicles' wiring harness products. For examples, part # C56172 has a 4-pole flat type connector and part # C56278 is a 7-way type.
    view full answer...
  • Recommended Trailer Wiring Harness for 2013 Ford Explorer
    The Curt T-Connector Vehicle Wiring Harness # C55384 referenced in your question is designed for your 2013 Ford Explorer only if it came equipped with the factory tow package. If your Explorer does not have the tow package then you may be able to simply cut the factory connector ends off the harness and simply hardwire the harness into the wiring on your vehicle, but I highly recommend going with the correct harness instead. If you don't have the factory tow package then the correct Curt...
    view full answer...
  • Which 7 Way Trailer Wiring Harness for a 2015 Ford Explorer
    There are often two different harnesses at the back of the 2015 Ford Explorer and it looks like you just have the incorrect one; occasionally they're in slightly different spots but there will only be 1 plug to install trailer wiring on a 2015 Explorer and there's not an alternate plug for vehicles with backup sensors. With that said, if you're looking for a 7 way connector I recommend using the Curt T-Connector Vehicle Wiring Harness with 7-Way Trailer Connector # C56278. This harness...
    view full answer...
    Image 1 for
  • Hitch Cover Availability with Brake Light that Doesn't Blink with Blinker
    Sounds like the hitch light you referenced is gets the stoplight circuit from the right turn/stop circuit (these circuits are combined) and that is why the unit blinks with the blinker. The # CR-017 might be a better option for you as it will only blink with a blinker if the brake are already being applied. With just the blinkers on it would not flash.
    view full answer...
  • Only Found One Connector Under 2013 Ford Explorer to Install a Trailer Wiring Harness
    According to my contact in the tech services department at Curt the mating connector that would normally plug into the other connector should be located near the one you found. You will need to remove the protective caps from each connector then plug the # C56172 in line between the two connectors. You would then have a functioning 4-pole connector. If you cannot find the other connector then you will need to use a different wiring harness on your 2013 Ford Explorer such as the ZCI harness...
    view full answer...
  • Can Curt Trailer Wiring be Used with a Draw-Tite Trailer Hitch on a 2015 Ford Explorer
    You can use a Curt trailer wiring harness # C56172 with Draw-Tite hitch # 76034 for your 2015 Ford Explorer. The hitch and wiring do not have to be the same brand. I also recommend etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with a 3/4 inch rise or 2 inch drop and one with a 2-3/4 inch rise or 4 inch drop. It also includes a 1-7/8 inch ball, 2 inch ball, hitch pin with clip, and a storage bag. If the ball mount kit does not have the right rise or drop to tow the...
    view full answer...
  • Best Trunk Mount Bike Rack for a 2018 Ford Explorer
    The best three bike rack we offer for a 2018 Ford Explorer is by far the Yakima FullBack Bike Rack part # Y02633 which is a personal favorite of mine. The FullBack has a very sleek black finish so it won't stand out, anti-sway cradles to prevent the bikes from coming into contact with each other or the vehicle, rubber pads to protect the vehicle from scratches, and locks for security of the bikes. I have attached an install video for you on the above as well for reference.
    view full answer...
  • Trailer Wiring Harness for a 2014 Ford Explorer XLT Without the Factory Tow Package
    You may be able to use the Curt T-Connector Wiring Harness, # C56172, on your 2014 Ford Explorer, but before buying the harness, I recommend testing the connector on your Explorer to make sure it works. Sometimes vehicle manufacturers will leave the factory trailer wiring in place, but they will not include the fuses and relays necessary to make the wiring active. Using a circuit tester like part # 40376, test the pins in the factory connector while a helper runs through the tail light...
    view full answer...


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