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Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring - no cutting, splicing or tapping required. Includes tail light converter.
Features:
Specs:
Installation
This custom-fit T-One connector plugs into your vehicle's wiring harness, which is located behind the driver's-side and passenger's-side tail lights. You will have to remove the tail light assemblies to access this harness.
Once installation is complete, the 4-way flat 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.
Tail Light Converter
A tail light converter is built into this T-One connector. 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 your trailer. The tail light 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.
California residents: click here
Average Customer Rating: 4.9 out of 5 stars (420 Customer Reviews)
Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring - no cutting, splicing or tapping required. Includes tail light converter.I think this was the same one that I had installed on my 03 Tacoma back in '05. I recently found that the output voltage for the right-side brakes/turn signal was something like 5VDC, not enough to light up the incandescent trailer bulbs. It must be the 'conversion' box going bad. I really liked the integrated cap for the 4-connector plug and I figure that 17 years was a good run, so I got it again. Installation was about a 4.5 hour job, but that was partially due to the fact I had to pull out the old one. Plus, I had a 7-way round plug (with brake controller) installed later too, and the shop that did it tapped into this 4-way wiring. I tried to re-connect that one, but I ran out of time. Once done, when I tested it with my 5x8' utility trailer, all the lights lit up like they were supposed to. It was a fun project and anyone with even a small amount of technical know-how will be able to do this. Only questionable part is where to run and tie off the wiring, but not a big deal.
Katrina B - 08/15/2022
Everything works as it should after one year. Installation was a breeze!
The product is excellent. But when you have a vehicle that is built between year models you may or may not get the part you need. This product doesnt work on my 1989 Toyota 4x4 that has a production date of 9/1988. It has the split signal/tail light that this kit will not work for. They staff were actually people. And not just people, but ones who care about your satisfaction which is rare these days. Thus the 5 stars not only for the product but personal "real" people to talk to thst are extremely helpful.
Jenny N - 08/02/2022The harness was plug and play on my 97 Tacoma. The hardest part was routing the wires, which was very easy. (Watch the installation video to get an idea of how to install it.) Installation can be accomplished in 30 minutes to an hour at most. Hopefully, the harness will last a long time.
The wiring harness was well worth the cost. It was straight forward to install and saved lots of time compared to making the harness myself. All lights worked immediately.
Easy installation and everything worked like OEM.
Easy to install and works great with the OEM connectors. Well designed for easy installation with the end user in mind. Keep up the good work.
Very easy to install! Tutorial videos on Youtube. No problems
This wiring harness is easy and works. My 99' Tacoma doesn't have a connection for a trailer. I have put off having someone wire it for years. Mainly because of the expense and having to make time to take it somewhere. It was going to cost over $100.00 to have it done. Then I stumbled across etrailer.com while trying to see if there was some way to wire my truck myself. It took me fifteen minutes to hook this harness up. The reason it even took that long was because I was a little picky about how and where I wanted the plug to hang. Why can't everything be this simple?
I purchased the T-One vehicle wiring harness for my 2003 Toyota Tocoma. It was exactly the correct fit for my truck. This plug n play kit took no time to install and it completed my trailer hauling project. The I am extremely satisfied with the products and the customer service was impeccable. I would recommend this product and if you need any trailer supplies use etrailer, you be glad you did.
The installation was exactly as the video shows. I did not install a bracket or tube cover for the wires. The installation took between 15-20 minutes. I used extra black zip ties to make sure the wiring is secured and doesn’t droop down. Other than that, it’s a very simple connect and play set up.
Easy installation on the hutch and trailer wiring kit... I’m extremely pleased with my purchase . Great product, company and service! Quick shipping and excellent customer service.... I highly recommend etrailer !!
My order was received within the time frame when placed, was very well packaged. Have taken the evening it was received to review the instructions which were thorough and very understandable. This is I believe, the third time I have ordered from e-trailer, and I highly recommend them for a lot of needs not only trailer wiring. Highly recommended, great place to shop. Have yet to place it on the vehicle, but will update my experience later today.
My item was shipped within hours of placing the order. I love these guys!
Great products easy installation!!
I just received my new wiring harness yesterday, and I'm anxious for this weekend so I can get it installed. I've watched the instructional video and read the instructions that came packed in the package and nothing could be simpler. I bought this unit as a replacement unit. Shortly after buying my truck new in 2004, I installed a cheaper version using "SCOTCH-LOKS" to tap into the wiring. The original converter failed is the reason I bought your product. The only modification I needed to make was cutting off the molded on 4 pole connector so that I can use my existing BERG 7 round pin connectorthat fits my 5 trailers, 2 with electric brakes and batteries, 2 regular box trailers, and 1 flatbed trailer. I highly recommend using a quality di-electric grease at the vehicle plugs, it will greatly reduce the chance of corrosion at the plugs.
Thank you for a fantastic product.
Dave S - 01/15/2016First off I watched both YouTube videos, one on the hitch and the other on the wiring. The videos told me what parts I would need to finish the install. Tools: I would suggest a impact wrench or drill. If using a wrench be careful the bolts are on there tight and when they let go you can scrape your hand on many different parts of the truck (not fun). The bumper and brackets disassemble is straight forward, have someone help hold the hitch while you put in the bolts. Put the brackets on and line up the holes but don't tighten all the way. When both sides are on you want to make sure they are both spaced the same. Then tighten the bolts. When running the wire just follow the wiring that is already there, I used about 15 plastic ties. The hitch is heavy and built like a tank, I will use it for occasionally pulling a 4x8 trailer with a motorcycle. Overall very satisfied with the hitch, wiring and etrailer.com.
Dan B - 04/29/2018My order, class II trailer hitch and wire harness, was on time and delivered with no missing parts. George sent me an email letting me know that the order shipped and then followed up to insure it was correct once received, I highly recommend George and his Company. They are honest and dependable people, which is a hard quality to find these days. Quality of the hitch was outstanding and the wiring harness went in without a hitch, sorta speak.
Thanks Etrailer, I will tell everyone I know about you.
Alan S - 04/24/2018Installation could not have been easier! Super straight forward instructions for both the wiring harness and the hitch, which I also bought from etrailer. Even had a instructional video for the wiring. I've used this 2" hitch on my 1999 Toyota Tacoma to haul my utility trailer loaded with 2 vintage Italian scooters on 600 mile+ trips and never had any issues. I also use it to haul my 17' sailboat with no problems. Lights always work!
Richard M - 06/26/2020I really like this method of connecting wiring harnesses , there are no splices ( much better than in the "old days" ) .
splicing always seems to fail at some point .
the connectors fit perfectly and the wiring itself was just right, on lengths.
it took me about 15 minutes to install .
the only issue i had was that it was a little sung getting the T connectors to fit in the "taillight well" - it may have been easier if they had , just a inch more wire between them so they would bend away and down from the bulb fixtures better .
i haven't connected my trailer yet , but i have no doubt it will perform correctly , and all my truck lights are operating normally.
not entirely sure i understand what duty the converter performs , however i am happy that it includes one (from what i have read )
David - 02/25/2019Shawn B. (& everyone I talked with at E Trailer) was wonderful.
Great phone support. Great products. We did a great job installing the wiring harness.
Made me wonder why we originally took it to a "professional" trailer sales & service place in Ogden UT. They hacked into our wiring & created problems.
I will continue to be a grateful customer.
Finding good people who know their stuff in todays world is a soul healing event.
Thank you E Trailer!
Nancy - 08/19/2018Always the parts I need at a great pric e.
Above excellent. I had previously bought a standard cut and wire in cheap unit and took an hour to cut and slice this in realizing that this did not include a brake wire adaption. I was going to figure it out and make it work. I saw this unit while looking for parts and thought I would try it and see if all worked. Someone would be crazy not to buy this unit. It is very very fast to hook up, accurate quality connectors and wire and EVERYTHING works just like the pickups tail lights and you don't need an Auto Technology degree to make all work instantly. The price is ridiculously low and having used this unit once I would instantly pay double next time. Also the big plus is you keep total integrity of your trucks wiring. We live in salty road winter conditions and it is not good to splice chassis wiring if you don't have to. This is a terrific product.
Andy - 06/04/2014Easy to set up and works like a charm.
In the military and ready to hit the road when my trailer wiring harness lost a couple of lights. Uhaul wouldn't rent me the trailer until I got it fixed. Excellent customer service, shipping was extremely fast. I think someone came in on a Sunday to get my product out. Can't thank them enough.
Michael L - 11/30/2018
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