To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.
Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.
Error submitting comment. Please try again momentarily.
Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. Connector plugs directly into existing wiring. Powered converter reduces strain on wiring system and is made using SMT to ensure superior performance.
Features:
Specs:
Installation
This custom-fit T-connector plugs into your vehicle's wiring harness, which is located behind the rear bumper, along the driver's-side frame rail. Once you've plugged in the T-connector, locate the truck's power wire on the driver's side of the engine compartment and plug the included fuse holder into the matching connector on the power wire. Then attach the fuse holder to the positive terminal on the truck's battery.
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.
A tail light converter is built into this T-connector. This converter is a circuit-protected, battery-powered unit that bypasses the electrical routes that are used by a basic wiring harness. As a result, there is virtually no draw on your tail light circuits.
Because most trailers run on a two-wire system - wherein the brake and turn signals are carried on one wire - the separate brake and turn signals from your vehicle's three-wire system need to be combined so they are compatible with the wiring system of the trailer. This converter combines the brake and turn signal functions of your automobile so that they run on one wire to properly activate your trailer's tail lights. Note: This will not affect how the tail lights on your vehicle operate.
Curt builds each tail light converter using surface-mount technology (SMT). This method of construction involves soldering electronic components directly to the surface of a printed circuit board. SMT eliminates the need for leads, which are used in older through-hole technology. The result is a circuit board that is smaller yet provides more routing area and that offers superior performance, reliability and durability.
Circuit boards constructed using SMT have been shown to perform better under rough conditions with excessive vibration than those made using the through-hole method. And where would vibration be more likely to occur than in towing applications? Curt converters also produce less heat, leading to increased durability and longer life. In addition, lower levels of resistance ensure better performance, especially for parts that operate at higher frequencies.
Each Curt circuit board is made using high-quality components that are pieced together in the most technologically savvy fashion, leading to greater predictability and reliability in functioning.
California residents: click here
The wrong product, despite being labeled guaranteed to fit. Does not fit the plug on my truck, please help me find the correct wiring harness. 2002 Toyota Tundra. Without proper pics of the plug on the product, I can’t tell what fits! See attached pictures please, my truck plug is on the left. The one I was sent is on the right.
Scott
7/29/2024
Got help from etrailer. I was trying to use the wrong plug. Found the right one and this product works perfectly! Thanks for the followup etrailer. Can I update my 1-star review since this was operator error?
Super easy install, Great videos for install online. Works flawlessly.
Easy order process
Shipped quickly
Received the correct part
Easy installation
Works perfectly
Thank you
Fart service, Easy hook up!
So far the device seems to be working as expected. It is easy to install, as it simply plugs into my truck's existing wiring harness. I recall that I mounted it using zip ties, which takes a little bit of time to do properly. I have often found that these Flat 4 adaptors fail internally after a few years...I hope that this one lasts a bit longer.
Coincidentally, the flat 4 to 7-way adapter that I installed after THIS wiring harness, seems to have lost signal to one of the turn signal lights, but this is another issue to do with another piece of equipment. Where I live and drive in Western Canada, the salt on the roads in winter often plays havoc on the undercarriage of vehicles, including any exposed electrical connections. As the song goes, "Oh what fun it is to ride...."!
I haven't installed yet, but etrailer is a great company. Excellent selection of accessories and knowledgeable technical support.
This harness made it easy and works wel l.
The wire harness for my trailer went out on my 2001 Tundra. After checking with local businesses, I discovered that it would cost about 150 dollars to get a harness installed. I decided to check the internet and found a video produced by etrailer. The video showed how easy it is to do the installation yourself. I ordered the harness that fits my truck, and the delivery was fast. Taking my time, I installed the harness in about 15 minutes and saved 100 dollars in labor. By the way, the new harness works as it should. I have purchased several products from etrailer and was pleased with every purchase.
John H.
10/22/2018
It has been one year since purchasing this wire harness. Am still very pleased. The harness works with zero problems.
I got late but was very pleased to find out it worked exactly as y’all said it would. Easy to install too. I’m very happy. Thank you.
Kevin
4/22/2024
I’ve use this product for a year now and it’s great. Gave me no problem or issues. I’m very pleased with this product.
Product installed very easily by following the simple instructions. Nicely done, thank you.
Very easy to install and worked perfectly. Highly recommend for a first gen tundra.
You have to have this to run your trailer lights. I wired my initially by tapping into the wires going to the brake lights. Everything was fine until I plugged in the trailer wire harness. Didnt know you needed to come straight off the battery either. This harness solved all those issues. Very happy I bought this.
The harness worked great and the video as to where the connector was under the vehicle was, as it wasn't where you would expect, was very helpful. Thanks!
Lyle
4/19/2022
No issues with the connector after a year. Great product and help!
Making electrical connections on a car, truck or other vehicle can, at times, be a challenge. The C55378 wiring kit for my 2002 Tundra was a breeze to install. The instructions are very clear and the video on the eTrailer web site made installation that much easier. Not sure about the converter electronics but the turn signal draw on the blinker controller didn't make the blinker indicator operate at warp speed and burn the controller out! All the necessary cable ties and adhesive pad are included in the kit; nothing else to buy or add; other than your trailer!
Once again, the folks at eTrailer are great communicators and kept me advised of the product whereabouts through the entire order process.
Super happy with service and product quality of the trailer wiring harness adapter I ordered. Straight forward and simple 10 min installation. The instructions were a little off as far as location of factory harness to plug into, but that's not a difficult thing to figure out on your own. Will use etrailer whenever they have what I need.
works ok , but need a reminder to double check plug ins before closing up ones work as the new pins will push backwards and not connect then after one closes up he will find a light not blinking properly , did go back and take car apart and find the pins that didnt connect properly , then all worked , thanks , david
I received the wiring adapter very quickly after I placed my order. I had already watched the video etrailer.com, that was specific to my 2002 Toyota Tundra, so the install was straight forward and simple. My truck had a 4 pin connector spliced in by the previous owner but the brake lights didn’t work on my trailer. I installed the adapter kit and everything works as it should now. I’m super impressed with the products, the communication, and the info provided by etrailer. Etrailer.com is top notch, thank you!
This wiring kit was a great solution to my problem. I had old, corroded wring at the end of my 4-pole trailer connector. I found the etrailer videos very helpful in pointing me to how easy it can be to replace just the corroded peice. The parts were just the right parts, fit perfectly and took about 20-min to get the whole thing done. And the shipping at the normal rate was fast...ordered on a Sat PM and received on Tues.
The product itself is very good - no complaints. The installation instructions don't really match the product (for example, the instructions say that the rear end of the tow harness is on the passenger side; but the picture on the instructions, the video, and my truck(!) all agree that it's on the driver's side). The video was quite accurate, so I suggest you follow the video.
FANTASTIC PRODUCT. I did not realize that my tundra required a control box to make the brake lights work, as I had been struggling with it for months. Your product snapped right in, and I had brake lights within a matter of seconds. Very pleased
My 2002 Tundra had the factory tow package but the converter (behind left tailight) was bad. Only my left turn signal and left brake light worked on trailer. This product plugged into factory harness easily and fixed my problem.
Purchasing from etrailer.com was an excellent experience! The wiring harness arrived promptly, and it was a quick installation. It was an immediate fix of the trailer lighting on my vehicle. I will definitely go back to etrailer when the products they carry are needed.
A very pleased customer, Sid Strickland
Excellent because I just installed it. Had a T-One I bought from ETrailer 10 years ago that finally went bad. ETrailer does an excellent job with selection and service. I chose the Curt model due to highter amps per circuit 9 as compared to 7.5. Towing something with a higher amps draw is the best way to destroy it and never use more than a 10 amp fuse!!!
Unlike other online dealers etrailer.com has a very well designed web site that is easy to navigate. What was really helpfully were the utube instructional videos. They made a Video for installation of the trailer wire harness for my 2002 Toyota Tundra. Impressive.
The curt T-connector was an exact matched fit to my 2002 Tundra. The instruction videos on your web site were very good quality. You are now my go-to connection for trailer parts. Thanks.
Info for this part was:
At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time.
Brooke M.
7/29/2024
Hey Scott! Take heart, we have seen this before! I dont have the ability to post a picture here in the comment but if you go to the link I attached, you will find an expert answer that has a picture of two plugs right next to each other. I am thinking you pulled the wrong one by mistake but the correct one should be right by the on you found. If not, please let me know and we can get you set up with a universal wiring harness that you can splice in like part # HM48240 if need be.
Helpful Links
question-396732.html