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  1. Custom Fit Vehicle Wiring
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  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. 1-800-496-5010 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 (366)
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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   (366 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.

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


by:

Used this on my2016 Ford Explorer #C56172 couldn’t have been easier plug It in tie it down. I ran mine on top of hitch. Only thing is they need to provide longer ties not a problem for me have different sizes in my shop.




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-


Comments
I have absolutely nothing negative to say. Today, as from day one, I am 100 satisfied with my purchase and my installation. I believed enough in my purchase that I bought ordered one for our priest - he has only words of praise for the product.
Ron F - 05/19/2022


by:

The direct connect plugs make the install very easy. I should have looked closer but this kit does not include the mounting plate for the plug. Not sure why you'd have to buy that separately.




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.




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


by:
2017 Ford Explorer

Perfect fit & function on our 2017 Ford Explorer XLT.




by:
2014 Ford Explorer

everything was just great, The proc=duct is well done and quality. I recommend etrailer




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!




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!




by:

Glad I purchased this easy to install wiring harness.




by:

Decent quality, fast shipping




by:
2017 Ford Explorer

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




by:
2017 Ford Explorer

Fast and easy. Great product!




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


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


by:

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




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


by:

Plug and play - what can you say.




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




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


by:

Wire harness was a great purchase and connected well.




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


by:
2015 Ford Explorer

Excellent product provided by an excellent team. I've used my trailer a few dozen times already to haul kitchen material (kitchen demo and remodel) to the dump along with picking up wood for the outdoor and indoor fireplaces.


Comments
Everythings been great. From the purchase process through actually using the product, no issues at all!
John G - 07/31/2017


by:
2015 Ford Explorer

Easy to hook up and it's not even noticeable, great and reliable every time.



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366
Show More Reviews

See what our Experts say 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...
  • 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...
  • 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...
  • 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...
  • 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 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
  • 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
  • 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...
  • Locating Trailer Harness Wiring Connection Points On 2016 Ford Explorer.
    I have attached a link to an installation video that shows the Curt T-Connector Vehicle Wiring Harness, part # C56172 being installed on a 2015 Explorer. Since the 2015 and 2016 are within the same generation, the installation would be the same. The T-connector on the wiring harness has a plug and a socket. When the harness on the vehicle is separated there will be a socket and a plug. Connect the plug from the vehicle into the socket on the T-connector and then connect the plug on the...
    view full answer...
    Image 1 for Image 2 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...
  • 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 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...
  • 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
  • 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...
  • 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...
  • 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...
  • Trailer Wiring for 2015 Ford Explorer without OEM Trailer Wiring
    That does look like half of the factory wiring usually used to install wiring kits that fit the OEM wiring like the Curt kit part # C56172 which you can see in the install video I attached. If you only have that single harness though you won't be able to use this kit since it needs the matching side. So instead you'd need a kit like the part # HM40285 which installs by plugging inline with the taillight connectors.
    view full answer...
    Image 1 for
  • Trailer Hitch Recommendation for a 2014 Ford Explorer Sport
    Yes, the hitches we carry like the Curt hitch part number # C13386 have been confirmed to fit all models of the 2014 Ford Explorers so they would fit a Sport model as well. I attached an install video for you to check out as well. If you wanted to do some towing you might be interested in 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...
    view full answer...
  • High Rated Trailer Hitch Recommendation for a 2015 Ford Explorer
    The highest rated trailer hitch we offer for the 2015 Ford Explorer is the Curt hitch part # C13386. If you check out the review tab on the product page you will see all of the positive reviews we have for this hitch. There are quite a few. I attached an install video link for you to check out as well. If you wanted to do some towing you might be interested in 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...
    view full answer...


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