Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
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This harness skips the hassle of splicing wires or tracing factory circuits. It plugs directly into existing ports behind the trim so you can get a working 4-flat trailer connector without cutting anything. The design is truly plug-and-play—install it, add the included fuses, and you’re ready to hook up trailer lights.
Instead of drawing power from the lighting circuits, the harness uses its own powered converter. That means it won’t overload the vehicle wiring or trigger shorts. The converter also combines brake and turn signals into a single wire for standard trailer lights and reduces power draw to keep electrical systems safe.
The 4-flat plug provides running lights, turn signals, and brake lights in one simple connector. It’s compatible with standard trailers, including wishbone styles that use separate running light wires for each side. The included 10-amp fuse protects against overloads so your lights stay reliable trip after trip.
The converter box uses a newer surface-mounted circuit board design that stands up to vibration and heat better than older through-hole types. Solid connectors and a dedicated ground lead help ensure full voltage for bright, consistent trailer lighting every time you tow.
Customer Satisfaction Score:
96% were satisfied with this product
4% of customers were not satisfied
Ratings & Reviews
etrailer was awesome and their listings were easy to understand.
Pros:
Plugs in easily.
Includes a varirty of fuse sizes.
Adds a 4 wire connector.
Cons:
My kit was missing the dielectric grease
The wire harness in the kit is not wrapped in loom. Buy 10 feet of 3/8 loom and a roll of electrical tape.
IMPORTANT CHANGE: The kit has enough wire to not have to flip the 4 wire out through the tailgate and look junky when you tow.
1. Where the interior 4 wire lugs into the factor harness, cut the factory harness tape away and run the factory harness as far to the driver's rear as possible.
2. Wrap the Curt leads in the wire loom.
3. Plug the Curt 4 wire plug into the factory harness, routing it to the driver's rear.
4. Low in the rear you will find a large grommet that cares wire out to the rear, cut a slightly larger hole in it, and push your 4 wire flat through.
5. Feed as much wire as you have into the void space, which is behind the rear bumper, near the lower Driver's side reflector in the bumper.
6. Get under the rear and route the Curt harness to the hitch, there a few obvious points to zip tie the harness, then zip tie to the hitch near the receiver.
This will look and function much better.
Today I installed:
- Draw-Tite Max-Frame Trailer Hitch Receiver (Item #76156)
- Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector (Item #C56217)
- 7-Way RV Upgrade Kit for Trailer Brake Controller Installation - 12 Gauge Wires (Item #ETBC7L)
It took about 4 hrs at an amateur pace with manual tools.
This is the second time I put a trailer hitch receiver on a Toyota Highlander. My first installation was a Curt on a 2010 Highlander. This time I got the Draw-Tite for my 2018 Highlander.
Few observations:
- The fact that the car comes pre-wired and with welded nuts for the hitch makes the installation smooth and easy. Nicely done by Toyota.
- The Draw-Tite hitch receiver is NOT designed for use with weight distributing hitch, which may be an issue for some users.
- I like the that the hitch is nicely hidden under the rear bumper and comes with the bracket for trailer electric connector. Keeps things nice and tidy.
- The installation can be done by one person (with the aid of a couple of plastic buckets), but I STRONGLY recommend to have a helper. The hitch receiver is heavy and if you drop it can cause some serious damage to your body.
- There is no need to remove the passenger side plastic mud cover behind the rear wheel.
- There is a good reason why they don't show you the cutting and installation of the driver side mud cover in the etrailer videos. It's the proverbial PITA. :-)
- The receiver ends-up about 16" from the ground (with the car unloaded), so you will need a 2-3" rise ball mount to end around 17-18" once the trailer is hooked up.
- The cables can be routed nicely through an existing hole under the driver side plastic storage bin. It comes with a rubber plug which can be cut just enough to lush the connector through. This is the cable routing for OEM Toyota trailer cables. And because is it hidden under the plastic mud cover, you don't have to worry water getting in when driving on a rainy day.
- Make sure to protect the cables with a plastic hose or by wrapping them with plenty of insulating tape to prevent chaffing in the places where the cables cross hitch members. Some edges can be sharp and sooner or later will cut through the insulation.
- Trailer wiring and the T-connector are power all the time, regardless of if the key is in the ignition or not. So make sure to unplug your trailer when parked for extended period of time to prevent running down the battery. The T-connector itself draws only about 1 mA when idle, so you don't have to worry as long as the trailer is not connected.
- The fact that you can see the hitch with the rear view camera makes hooking up the trailer a breeze by just person.
Overall, I'm happy with the product.
And etrailer customer services and prompt shipping was, as always, 5-stars. (I am a returning customer)
Hitch arrived w/in a week of placing the order, free delivery! Box was slightly banged up, but hitch was not damaged at all. Please note there is no interior packaging around the hitch. This was a self-install, one man job. Hint: watch the etrailer videos & other videos online as this will help a lot. I had no issues w/fitting the hitch but one of the tips I did use, was to reuse the box the hitch shipped in as support for the hitch during installation. I also used a scissor jack for final mounting to line up all bolts. I tightened to the recommended torque and was VERY pleased w/the final outcome. Passenger side under panel trim did not need trimming, drivers side did require a cutout but you can trim this smaller than the instructions detailed. Hitch looks great on my 2010 Toyota Highlander! Ordering from etrailer was easy & I would do so again, if needed.
This wiring harness fit my 2008 Toyota Highlander Sport perfectly! It's very easy to install, especially if you watch the installation tutorial video. It's literally plug and play. Everything you need comes with it, including the fuse and zip ties to hold everything in place. The only hard part for me was getting under the dash and tucking everything away neatly, but that's because I'm a big guy and there's not much room down there. I ran mine to the outside of the vehicle to the hitch and installed it in a mounting bracket instead of leaving the harness inside the car and pulling it out every time I need to use it. There was an extra hole that had a rubber plug in it near the tail light area where the connector for the harness is. I took the rubber plug out and ran the wiring to the hitch. I filled the hole with silicone caulking on the inside and outside to prevent any water from getting in. I also wrapped all of my connections with electrical tape. The four way has a dust cap to protect the pins from dirt and debris when not in use. I installed it on the hitch using the mounting bracket (item 18144) here: https://www.etrailer.com/p-18144.html . Looks great! I tested my connections and everything works perfectly! Great product, great price, and you save a ton of money on installation by doing it yourself! Thanks, etrailer.com, for the great tutorial and product research!
The customer service, as others have mentioned, is amazing. From the initial order confirmation through product install, they were very helpful. My hitch arrived bent and after a brief call to Bill in customer service, I was up and running in NO time. The online videos were super helpful, thanks!!
The trailer hitch and wiring harness was a perfect match for my Toyota Highlander. Great quality and delivery time was faster than I expected and no damage.
Shipping was prompt. Arrival was without damage. Instructions were clear and easy to follow. Installation time was about an hour as the instructions predicted. The fit was perfect! The qualtiy seems good and the hitch looks good on my vehicle!
Tom D.
9/17/2018
Excellent..no problems!
This was the easiest install to date. I have done a couple of other hitches on my vehicle. The connecter harness was super easy to route under the vehicle without having to hang it out of the trunk lid like the video suggests. The rear driver side has a knockout plug that you can easily run through. Mine was a 2016, so other models may vary. I would drill a hole in the same spot if there wasnt a hole before I hang it out the rear door. Just my two cents. Awesome and easy product. I love etrailer because they provide everything and everything is test prior!
The website gave me the perfect fit for our Highlander. Shipping was fast and arrived on time. Installation was a breeze with the hitch and wiring harness. Great overall experience. FYI…I installed this entire system by myself in under an hour.
Joshua
6/12/2023
Works perfect
Mike L.
9/6/2023
I have a 2019 Highlander and the installation went very well. I bought the Drawtite hitch with the mounting bracket for my wiring plug, so I wanted my wires to go under the vehicle and not through the rear door. Once I removed the trays from the back of the vehicle, there was a rubber plug in the corner that could be removed that allowed access under the vehicle. I decided to use my box knife to cut a slit in the rubber plug. I had to cut my wiring harness across the 4 wires to run them through the rubber plug. I crimped them back together as seen in the photo. I used zip ties under the vehicle and inside the back to clean things up.
Mike L.
1/28/2019
Nice job on the install! I would make one recommendation.. Id use some silicone to seal the hole in the grommet where the wire passes through to prevent moisture or exhaust gasses from entering the passenger cabin.
plug and play worked, along with the instructional video made the installation very simple.
It was quick and easy to install. The video was very helpful. The plugin for the trailer works great!
Step by step installation video was easy to follow. It performs as expected!
Y'all are the best for hitches and wiri ng!
Plug-and-play made this such an easy jo b!
Harness connector went it smoothly in our 2016 Toyota Highlander, and worked right off. The instructional video was great. Recommend buying the tester light unit. I've never been unhappy with anything I've ordered from ETrailer!
Very easy installation. Watch their video on YouTube!
Easy to install - especially with the instruction video. The wiring has my license plate light working on my bike rack. I'm waiting for a bike rack light set then I'll connect it. I expect it to work fine.
The only thing missing from the package was the cover for the 4 wire terminal.
Shipping was not only fast, but they know what they're doing when it comes to packaging.
I struggled a bit getting the hitch installed but that was because I did it myself. Extra set of hands comes in handy because...the bolt holes do not leave much if any room for misalignment. This hitch mounts as near perfect as you can hope for and no woggle room for the bolts.
This thing is built like a tank. Looks good too.
Very happy with the product and Croft Trailer did a great job with the installation. They were also able to get my hitch installed quickly as I was in a rush. Highly recommend Croft Trailer if you need an installation
Honestly, super easy installation. Photos were ok, would have been better in color for ease of clarity, but they were solid enough to see things in the end. Quick installation up front, quick installation in the rear - could have done with some recommendations on where to run the connection through to the outside, but it was easy anyway. Oh, since this was for a Highlander, I would have liked to have seen the proper fuse included for the car side of things - a 10a mini-fuse was included, but the car calls for a 30a mini low-profile fuse.
Works great! Simple installation with the instructions and video link that came with it
The installation instructions were complete and easy to follow, and the connector installation was as advertised!
I ordered this hitch and wiring harness for my recently-purchased 2019 Toyota Highlander, and everything fit and worked perfectly. I towed my fully-loaded storage trailer from MD to my new property in NC without any problems. Installation video was a huge help! The dealership quoted me $1000 to install a hitch...
I installed this in my 2013 Toyota Highlander AWD Limited. This model was pre-wired with the tow package but did not have the wiring harness and trailer connector, so the kit with only the 4-Pole flat connector isn't enough. Installing was very simple, I followed the provided video. The only thing I had to do differently than the video was to cut off the end of the ground wire because the ring terminal was too small to fit over the bolt on the break cover, and I couldn't find any other smaller bolt. The kit came with a larger ring terminal, but I just stripped the wire and connected it similar to connecting a wire to a light switch - just wrapped the bare wire around the bolt and tightened the nut down. Tested brakes and turn signals with an ohmmeter, all worked without any issues.
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Joe M.
5/18/2015
Thanks for the follow up!It?s awesome. Works like a charm!A friend gave me some advice that sadly I didn?t listen to though. He told me, ALWAYS remove the ball hitch when not in use. That way when you walk around the back with groceries you didn?t hit the hitch with your shin! lol Sadly last week, after a year, i had my first encounter with the hitch while carrying groceries! lol Hopefully it?s my last.