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Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector

Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector

Item # 56042
Our Price: $13.61
Custom Fit Vehicle Wiring

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Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector No Converter 56042
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Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. Connector plugs directly into OEM tow package port - no cutting, splicing or tapping required. 1-800-940-8924 to order CURT custom fit vehicle wiring part number 56042 or order online at Free expert support on all CURT products. Great prices and Fastest Shipping for Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (142)
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CURT Custom Fit Vehicle Wiring - 56042

  • 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. Connector plugs directly into OEM tow package port - 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
    • Designed for use with a factory tow package
    • Compatible with 5-pole, 6-pole and 7-pole adapters (sold separately)
  • Connects quickly and easily - no cutting or splicing of wires
    • Locate connection point in rear cargo area
    • Plug in connector
  • Comes with dust cap for 4-way flat connector
  • Limited 1-year warranty


This custom-fit T-connector plugs into your vehicle's factory tow package wiring harness, which is located behind the driver's-side interior trim panel in your rear cargo area.

Once installation is complete, the 4-way connector will be stowed in an out-of-the-way location within your cargo area.

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.

56042 CURT T-Connector - OE Replacement 4-Flat

Installation Details 56042 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector - 56042

Average Customer Rating:  4.8 out of 5 stars   (142 Customer Reviews)

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


I appreciate the easy ordering process and fast shipping! The harness works perfectly:)

Toyota Highlander

Just a heads up for Toyota Highlander owners. My Highlander had the towing package from the factory but I still needed the converter and wiring harness combo etrailer package.


Excellent service. Quick arrival of products. Installed after watching their videos and one was very helpful since I was having a problem and the video showed me the correct way . Highly recommend the products and video search and the instruction.

2014 Toyota Highlander

Item was as described and easy to install, thanks to the detailed instructions- written and video.

Toyota Highlander

After balking at the cost to have an auto-shop add a trailer to our Toyota Highlander, we found and decided to take a chance. The "how to" videos factored considerably in our decision to buy ... they made it look so easy! And surprise! It really -WAS- that easy. We used standard block-type ramps (the kind you can buy for $40 ) to get the SUV up off the ground high enough to get underneath to do the work. Everything came off as easy as it was showed in the videos. Other than the fact this bar is a heavy so we had our teen daughter help hold it steady while we bolted it into place (i.e., get help for when you go to lift it), it went super smooth. Thanks for saving us $280 over the cost the car dealer quoted us! P.S. - be sure to watch the linked videos so you get the right trailer lighting attachment and ball hitch for your new hitch.



We are very happy with our trailer hitch, and all the accoutrements that we purchased with it. Your videos were enormously helpful, the hitch went on easily with a bit of help from our teenage daughter to lift it up into place, and we recommend your business to friends when they express an interest in getting a camper.

1999 Jayco Designer

This wiring harness was a huge time-saver over wiring things manually like we did for our last trailer hitch a long-long-long time ago! If you're not sure what to buy, watch the videos they have to make sure you get the correct one for your needs. We saved a HUGE amount of money over what the auto dealer quoted us for the exact same thing, and as a bonus, the how-to videos made it really easy to attach it ourselves. Yes, it really -is- that easy.



We are very happy with our trailer hitch, and all the accoutrements that we purchased with it. Your videos were enormously helpful, the hitch went on easily with a bit of help from our teenage daughter to lift it up into place, and we recommend your business to friends when they express an interest in getting a camper.


Joanne got things going in a very timely manner and I got my purchase 3 days early.


2012 highlander had factory tow package. This harness mounted in fine to the factory plug in the back but there was no power at the connector. After some research I found that I still needed to go to the dealer and purchase a $100 towing converter that plugs in under the dash on the left side.

Etrailer Expert

Jenny N.


It sounds like your 2012 Toyota Highlander didnt come with the factory tow package and that you would have needed part # C56217. It includes the additional wiring component that installs under the dash to complete towing circuit.


Thank you for the great service..


Good product delivered quickly


easy install...pretty cut and dry / plug and play

2015 Toyota Highlander

Great ordering and quick delivery. Product was just as described and super easy to install. Just a little disapoited in the wireharness that was available as it does not have a bracket to clamp to the hitch and will need to be replpaced. Make sure to order the correct one.

2012 Toyota Highlander

***READ THIS*** Great product, easy install *BUT* This might help someone else. I called the dealer and found that my 2012 Toyota Highlander has the " V-6 Towing Prep Package" I had assumed that was the factory towing package, I was wrong. Save yourself the trouble and physically look under the dash for the white connector as well, if nothing (no converter) is plugged into it, you will need the other wiring kit with the converter. [one of videos] clearly shows the connector I'm talking about on a 2012 Highlander I have now ordered the correct part. I am still very happy doing business with Thanks!


The product is amazing. I will say that the company that installed the hitch did not hook the lights up correctly and they trailer lights still do not work. It has nothing to do with the product. I am hoping that I will be able to take it back and get it fixed next week.


Perfect fit and the instructional video was excellent!

2008 Toyota Highlander

parts arrived ahead of schedule and in good order. Had it installed locally by a professional and am very pleased with the results, thank you! Order included: Draw Tite hitch receiver / tongue kit with 2 drop/raise sizes & 2 ball sizes / wiring, wire tester / for 2008 Highlander.


Was easy to install. The original was broken from someone hitting it. The replacement is not mounted on the outside but left in the storage space until needed.



Still working. I installed it and store in the area under the back mat. I believe thats the best because its not exposed to the weather. Id buy it again if needed as I saved a ton of $$ by doing it myself.

2019 Toyota Highlander

Very pleased with the trailer hitch. Very easy installation and directions were excellent. I would recommend it to anyone who is looking for a after market hitch.The wire harness worked like a champ.The whole job looks great.


Don't buy from car dealer, this is the same connector for a lot better price, and I didn't have to sport a face diaper to get it. etrailers is the best source out there. I recommend them all the time.


I bought the trailer hitch and required parts for my husband for Christmas. I had them install this week. All necessary parts were included and the dealership had no difficulty with the installation. Thank you.


The part came quickly, with great instructions and product description so I was able to install it quickly!

Jeffrey J.


Still working well!

2008 Toyota Highlander

Easy install, but I didn't want to leave it in the cargo compartment. There was a rubber plug right there in the well with the pigtail - just cut a slice half-way cut through the plug, put the wire in the cut, then fed out for zip to the new hitch..

2017 Toyota Highlander

Perfect fit with the 2017 Highlander. Simple installation.



I am thrilled with the hitch and wiring. They have both performed flawlessly. Thanks for the follow up.


Etrailer lived up to their word keeping their promise to give a $10. credit to us for paint. Delivery was fast and prices were better than others. Hitch fit like a glove with no issues.

2008 Toyota Highlander

Received the wiring harness and did not realize that I needed to order the wiring harness for the front under dash, everything else looks great....very happy with the trailer hitch.

Show More Reviews

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

  • How To Install a 7-Way On a 2019 Toyota Highlander With No Brake Controller
    In order to install a 7-way trailer connector on a 2019 Toyota Highlander you will first want to install a 4-way trailer connector as you mentioned, the Curt T-Connector Vehicle Wiring Harness part # 56042 that you were looking at is a plug-in-play fit. I have attached an install video for you. The Adapter 4 Pole to 7 Pole and 4 Pole part # C57674 can then be used to convert the 4-way to a 7-way. That said, if you only need the tail, brake, and turn signal circuits you just wouldn't attach...
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  • Can Trailer Brake Controller Be Installed on 2019 Toyota Highlander
    You can absolutely install a trailer brake controller on your 2019 Toyota Highlander, and the components you need will just depend on what the vehicle's already equipped with. If you don't have any trailer wiring at all installed at the rear then you need to start with a 4-Way harness. For this I highly recommend the Tekonsha T-One # 118449 if you don't have the factory tow package (no converter under the dash) or the Curt T-Connector # 56042 if it does have the factory towing package....
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  • Trailer Towing Setup for a 2012 Toyota Highlander Limited to Tow 2 Jet Skis
    For your 2012 Toyota Highlander Limited, you'll need a hitch, the wiring, a brake controller and an anti-sway system. Based on my research, it looks like Toyota recommends both a braking and a sway control device on a trailer at this weight on your vehicle. Prior to installing a hitch and towing a trailer, you'll want to verify your vehicle's gross vehicle weight rating (GVWR) and tongue weight rating (TWR) on the sticker inside the driver's side door jamb to ensure that you are aware...
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  • How To Add a 5-Way Flat Trailer Connector To a 2017 Toyota Highlander with Tow Package
    In order to add a 5-way flat trailer connector to a 2017 Toyota Highlander you'll need to start with the Curt T-Connector Vehicle Wiring Harness part # 56042 which is plug and play and has a 4-way flat connector. Then, you can add the Curt Trailer Connector Adapter part # C57187 to convert the 4-way to a 5-way. The blue wire gets spliced into the vehicle's reverse light circuit. Unfortunately, they don't offer a one piece 5-way flat trailer connector for most vehicles so you must use...
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  • Determining Correct Trailer Wiring Harness for 2014 Toyota Highlander
    If your 2014 Toyota Highlander has the factory towing package and thus the wiring converter under the dash it would be located behind a kick panel on the driver's side. The converter is simply a black box and will look very similar to the converter included with the Curt # C56217 that you would use if you don't have the tow package. If you'd rather not pull apart the kick panel to check for this you can also visit or contact your local Toyota dealer with your VIN. With this information...
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  • Trailer Hitch and Wiring for a 2015 Toyota Highlander
    Curt trailer hitch # C13200 will have the face of the receiver pretty much flush with the back bumper on your 2015 Toyota Highlander. I have included a picture out of the instructions, also linked, that shows the hitch installed. If you plan on doing 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,...
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  • Can a Brake Controller be Installed on a 2008 Toyota Highlander Hybrid
    The brake controllers and methods for installation do include hybrid models of the 2008 Toyota Highlander. All you will need to do at the brake switch is use a circuit tester such as # PTW2993 to test the wires until you find the one that only has power when the brake pedal is pressed and not at any other time (such as with the headlights or turn signals on). It is likely a blue/gray wire. You will also need to install a 4-Way trailer connector unless the vehicle already has one. If you...
    view full answer...
  • What is Towing Capacity for 2018 Toyota Highlander Limited
    I did some checking and it looks like your 2018 Toyota Highlander Limited has a towing capacity of 5,000 lbs so a 1,900 lb trailer wouldn't be a problem at all. Since your vehicle has the towing package you most likely have trailer wiring already, but in case you do not we have the Curt 4-way part # 56042 which is a confirmed fit. Since 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...
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  • Wireless Controller Needed for Towing with a 2018 Toyota Highlander
    We do have a wireless brake controller that can be used with virtually any vehicle; the Curt Echo # C51180. This is a proportional brake controller that uses inertia sensors to determine how much power to apply to the brakes so that your trailer brakes at the same time and with the same intensity as your 2018 Toyota Highlander. You control the settings via Bluetooth connection (through an app) with your Apple/Android smart phone. The only thing required to use this brake controller is...
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  • Location of Trailer Connector on 2014 Toyota Highlander with Tow Prep Package
    If your vehicle has a functional factory tow package there will be a connector at the rear of the vehicle behind the rear bumper. You may have to remove the trim panels to find it. I have made a diagram of the areas you should check for the OEM wiring connection point. If the connection is not there, I recommend using the Tow Ready Custom Fit Vehicle Wiring for the Toyota Highlander, 2014 # C59236 which will allow you to splice into the OEM wiring in the back of the tail lights.
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    Image 1 for
  • How to Determine if a 2012 Toyota Highlander has a Factory Tow Package
    The best way to determine if your 2012 Toyota Highlander has a factory tow package is to have a Toyota dealer run the VIN number in their computer system. They can tell you how the vehicle is equipped that way. If they say you do not have the tow package use harness # 118449. If you do have the factory tow package use # 56042.
    view full answer...
  • Hitch, 7-Way and Brake Controller Recommendation for a 2015 Toyota Highlander
    All three of the hitches you referenced # DT65MR, and # C13200 are confirmed to fit your 2015 Toyota Highlander and would not stick out past the rear bumper of the vehicle. The # C58000 that you referenced is a great way to attach a 7-way bracket to the hitch. The plate you referenced that is on the Hidden Hitch and the Draw Tite is compatible with a 7-way bracket like the # 18138. For trailer wiring you will first need to start with a 4-way like the part # 56042, to convert the 4-way...
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  • Will Curt Trailer Hitch Receiver 13394 Allow for Full Size Spare on 2018 Toyota Highlander
    The Curt Trailer Hitch Receiver # C13394 will fit with a full size spare tire stowed under vehicle unless the spare is on an aluminum rim, which is too wide. If you're concerned about the fit of the hitch with your spare tire I recommend the Draw-Tite Max-Frame Trailer Hitch Receiver # DT84MR which doesn't have this restriction. The Draw-Tite is also a Class III hitch with a 2" receiver. It has the same gross towing weight of 5,000 lbs and max tongue weight of 500 lbs. It also comes with...
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  • Best Trailer Wiring Harness for a 2014 Toyota Highlander with or without Factory Tow Package
    The easiest way to determine the wiring harness you will need for your 2014 Toyota Highlander is to have the dealer run the VIN. They can tell you if it is equipped with the factory tow package or not. If it is, then you would need # 56042. If it does not have the factory tow package use # 118449. You might be able to test the factory connection point at home to determine if it is functional or not. You would need a circuit tester such as # PTW2993 or a multimeter such as # PT89ZR. Then...
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  • Trailer Hitch Wiring And Tail Light Kit For A 2014 Toyota Highlander
    For your 2014 Toyota Highlander, I recommend the -Curt T-Connector Vehicle Wiring Harness for Factory Tow Package # 56042. This harness will simply plug into your OEM factory harness for your 2014 Highlander. Since you also mentioned you wanted to install lights for your bike rack, the -Magnetic Tow Lights # PE26UR will work great since it has a magnetic base it will stick to any metallic surface. Additional, these lights will plug into the 4-flat # 56042 wiring harness mentioned earlier,...
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  • Recommended Trailer Hitch Receiver For 2017 Toyota Highlander Hybrid
    Apparently the installation or the aesthetic value of not removing the hitch cover was a better option. Competing companies made the same decision not to involve removing it. I agree that the Draw-Tite # DT65MR is the better option for your 2017 Toyota Highlander and it will fit with a full size spare and is confirmed to fit Hybrid models as well. If you will be towing with this hitch, I recommend the # 56042 wiring harness which will give you a 4 pole flat connector if you have the...
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  • Troubleshooting a Trailer Wiring Harness # 56042 Install on a 2014 Toyota Highlander
    The 4 pin connector used to install the # 56042 can be in a few locations which does make the install a little more interesting. I am glad you were able to find it. I would verify that you put the fuse in the correct location. If that doesn't fix the problem I would verify that the connector of the # 56042 is making solid connection with you tow vehicle and that the fuse didn't blow while in the wrong slot. I attached an install video that shows a very similar product being installed...
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  • Connector Location for the Curt Wiring Harness part # 56042 on a 2014 Toyota Highlander
    I am glad you were able to find the location for the connector of the part # 56042 on your 2014 Toyota Highlander. The connector can be in a few locations so we appreciate you letting us know where you were able to find it on yours.
    view full answer...
  • Adding a 4-Way Trailer Connector to a 2011 Toyota Highlander
    Dealer parts are often more costly than aftermarket parts but that does seem excessive given the parts they say you need. It looks like you ordered # 56042. Which is meant as a replacement 4-Way. You will need the harness you referenced # C56217 to make everything fully functional. It sounds like they are trying to sell you a 7-Way trailer connector. A 30 amp fuse and a relay are items typically associated with a 7-Way trailer connector. If you just need a 4-Way then you would use # C56217.
    view full answer...
  • Trailer Wiring Options for a 2013 Toyota Highlander Without Under Dash Converter
    Sounds like you bough a trailer wiring harness like part # 56042 which is designed for the versions of the 2013 Toyota Highlander that have the converter under the dash. The only option we can help you with is to go with a harness that includes the converter like part # C56217. Otherwise you can try to get the converter from Toyota so you can use what you currently have.
    view full answer...
  • Does a 2019 Toyota Highlander V6 Come with the Factory Tow Package
    Hey Floyd, great question! According to my research I do believe all of the 2019 Toyota Highlanders equipped with a V6 also have the tow package so the Curt T-Connector # 56042 would be the wiring harness you need. Toyota doesn't make it easy online to figure out what models do come with the tow package though so I recommend confirming this on your end as well. You can either remove the trim in the back of your Highlander to see if the large white plug has the OEM connector or not (see...
    view full answer...
    Image 1 for
  • How To Tell If 2016 Toyota Highlander Has Factory Tow Package Wiring
    I cannot say for sure how you can tell whether or not you have the converter on your Highlander but I can help you out with the trailer harness installation. The only sure way to tell which harness you need is to check out what wiring you have in the rear cargo area. If you watch the attached videos you can see where the installation differs. If you remove the back tray in the rear cargo area of your Highlander you can see if there are two connectors, one being bigger than the other....
    view full answer...
  • Recommended Trailer Hitch and Towing Equipment for a 2018 Toyota Highlander
    The trailer hitch that I recommend using to tow with your 2018 Toyota Highlander is the Curt # C13394. I like this trailer hitch because it features a hidden design without sacrificing any towing weight for your Highlander. This combination gives you a clean look and a strong trailer hitch. You also need wiring and a ball mount kit to complete your towing setup. For wiring I recommend the T-One # 118449 if you don't have the factory tow package or the T-Connector # 56042 if you do have...
    view full answer...
    Image 1 for
  • Recommended Class III Receiver Hitch for 2013 Toyota Highlander Hybrid
    Of the hitches available for your Highlander (see link), the Draw-Tite # 75726 will accommodate a full sized spare, is compatible with the Hybrid model, and would allow for the best ground clearance. Therefore, the Curt Class III hitch is what I would recommend for you. All the available hitches would require that the tow hooks be permanently removed, and would require the removal or trimming of the underbody appearance panel. The panel being trimmed or removed will not be noticeable,...
    view full answer...

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