T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

by: K.L.01/06/2014

2014 Tocoma..The wiring install, went slower the the hitch install. the main reason was the taping of the wires to the truck wiring and getting up and down. (time was 50 minutes) Install the driver side first, only the plug is placed with the tail light, install the passenger next, only the plug is placed with the tail light. Tape the new wiring to the stock wiring, start with the tail lights and work down you will find you have just the right length of wire. I taped the 2x2 black connector to the wiring harness. If the wires were 6 inch's longer on both sides, I would have used the two sided tape and stuck the connector on the frame 111973

I have used the the trailer connection on 5 different days for about 1 hour each time, two weeks ago I had to used the trailer to help move a friend of ours and it was raining so the lights was on all the time. the trip was 12 hours,there and 7 days of short trips and on the way home about six hours in to the return trip i stopped for fuel and when I started the truck I lost the tail lights and the brake lights,blown fuses. I stopped at a auto parts store and picked up some new fuses,when i turned on the lights the new tail light fuses popped and when I stepped on the brakes, the new brake lamps fuses popped. We stopped for the night, I will not drive a truck and a trailer at night without lights.The next day, and a hundred lighter, I got home, I disconnected the trailer and replaced the fuses. The fuses stilled popped. I opened the tail lights and disconnected the left tail light trailer connection and the fuse sill popped, and i disconnected the right tail light trailer connection and the fuses held. I will pull out the bad harness and replace it with a factory tow harness more money and more time to install but I no more problems and I will order a trailer brake to plug in to the stock wiring.

K.L. - 02/09/2015

by: Scott Hart04/25/2013

Installed on a 2011 Tacoma (pre-runner model)Doesn't get any better than plug and play! way less effort and problems over time to use a plug and play harness over the conventional crimp or strip and wire together solutions. Saves time and labor. My only complaint is the web site and the instructions need to be updated because this kit shows fitting up to a 2010 Tacoma. I assumed the factory harnesses were the same from Toyota but it creates doubt when your kit shows up to 2010 everywhere and it's now 2013. My guess and the search link at etrailer were correct and it will also fit newer Tacoma's even though nothing beyond that search request showed newer than 2010. About 30 minutes including figuring out how the clips on the Tacoma tail lights work to remove them safely and checking them after the install.Only tool required is a 10mm socket and perhaps an extra zip tie or two if you choose. I didn't bother using the wire covering that some purchased seperately and used. It's a small piece of wiring for trailer lights not the main fuse panel so I didn't overkill the install but you can if you prefer. Customer service, communication, shipping from etrailer was first rate and no complaints. 77843

by: Logan Somervell01/23/2013

Installed on a 1997 Toyota T-100. It took about 30 minutes. Everything was easy to install. It took a few minutes to get the truck plugs pulled apart (probably hadn't been pulled apart before). The plugs on this harness plugged right in with an audible click. I used the included cable ties as well as a few of my own to secure the wiring under the truck. Now all my trailer lights work, and I don't have to worry about any more splicing. I wasn't sure the passenger side wiring was long enough to reach across the truck, but it made the distance with a little room to spare. I decided on this product after spending most of a Saturday splicing and checking connections. I was trying to find out why I didn't have right signal or brake on my trailer. Truck's lights worked fine, but the trailer's lights didn't. I even checked the trailer while connected to a friend's truck, so I knew the problem was on the truck's end. I put all of the original truck wiring back in place, checked all the lights on the truck, installed this product, hooked up the trailer, checked the trailer lights, and now everything works. Thanks e-trailer. 63899

by: iain10/29/2012

This electrical harness is brilliant, good videos showed me how to install in minuets. Nice work etrailer.com! 58329

Im still liking the products I reviewed very much. I never usually bother to give feed back on stuff I buy online but it was so refreshing to have such a great product and for it to be so well supported buy your team I really wanted to express gratitude.

iain - 05/16/2014

by: Ryan R.01/13/2012

The wiring system was pretty straight forward. The video pretty much said all I needed to know. I'd rather use this set-up than any guy at a hitch shop doing a quick splice to the wiring in my truck, any day. The only thing I did differently from the video was put my wiring in the black conduit that you can buy pretty cheap at any auto parts place. This change will keep the wires from chaffing and makes the whole job look more professional. 29655

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by: Carl S02/09/2015

I have a 2015 Tacoma and installed this in about 30 minutes, requires the simple removal of the tail lights and plugs snap in line, no cutting or splicing. Hint: once the tail light bolts are taken out the tail light pop out by pulling straight back on them. 172990

Really? Wow, its still great and recommend to anyone that asks.

Carl S - 02/17/2016

by: Chuck09/12/2013

Have never used the T1 connection type cables (in last 4 installations) but THIS is the way to go. As always, videos and written instructions were great, but hardly needed....almost idiot-proof! 99675

They were great when I got them, great when I installed them and they have worked as advertised read great!Thanks for asking.

Chuck - 09/15/2014

by: Peter R11/05/2011

Ordering was easy,your web site was simple to maneuver in. I was notified the order was received and that it was being shipped early. I was skeptical as I found it on the net. Did not know your company and could not believe the rapid service. I ordered a lighting kit and trailer hitch for my Tacoma pick up. It arrived today in 5 days from the order date. I unpacked it to find it was very well made, I read the directions and 90 minutes later it was on the truck. The lighting took 30 minutes, well made I will recommend to my friends. It is perfect, exactly what I wanted. The construction and directions were "right on" everything fit perfectly. I am very pleased and would hot be afraid to order anything you sell. Thank you for my hitch. It was a pleasure doing business with you. Peter R 26603

by: Chris02/15/2013

I ordered this on Tue. and It was delivered on Fri. Installed in 30 min. and I took my time. Great product and etrailer had great communications. Toyota wanted $100 for the factory wire harness and over $100 to install. I intalled this myself and it was less that $50. 66484

1.5 years later no issues at all.

Chris - 08/16/2014

by: Gerry E. B.12/25/2010

Trailer Hitch Wiring Harness 2010 Tacoma I found this harness easy to install on my 2010 Toyota Tacoma. The directions were easy to follow with pictures to reference. It took me about an hour and a half to install complete with zip ties to make sure all was neat and tidy with the wiring. The hardest part was getting the taillight assembly out of the truck. Once the bolts are out, you have to use some force to pull the assembly back off the guide pins. I would recommend this harness to anyone looking to put in a hitch or in my case a LED light bar for stop, running and turn signal lights. The folks at etrailer were super fast in getting the harness to me. I would do business with them again would recommend them to my friends. Thanks for a great product and fast service! Gerry B. 4608

by: Paxton K07/05/2015

The product was delivered and functioned just as the company stated. It was easy to plug into and worked to perfection when I hooked up to my trailer. 209477

No problems at all. This product exceeds my expectations.

Paxton K - 07/04/2016

by: Scott W.06/07/2017

I had received multiple quotes to install a hitch on my 2014 Toyota Tacoma. All were around $400. So I did a little research and found the etrailer.com site. I found I could buy the hitch, the wiring harness and ball myself for less. The installation video they provided me gave me the confidence I could do the install myself. Now it's on and the entire process couldn't have been easier. If you can use a socket wrench and screw driver you can install your own hitch. Piece of cake! 391017

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by: Bruce N.04/16/2014

good fit on the connectors on the rear of the taillights, I followed the instructions starting on the driver side. routed the wires down and to the hitch following the existing wires... bad plan! seems like 44$ was not enough to provide 12" more of wire because the passenger side wires were short! after zip tying at 10 locations along the stock wire path (you would think Toyota would use the best route?) I had to cut the ties and route the wire in the bed sheet metal channel to make them long enough. WOW I would have gladly paid $2 more to have some extra wire to chose my route better. product did perform as advertised. give me some more wire and earn a better rating. 125681

by: Jerry H.08/05/2014

The installation videos made hook up easy. Everything fit and the wiring harness seems to work as advertised. 144503

Works just fine. Have had no issues with it. Thanks

Jerry H - 08/07/2015

by: Dave D.09/08/2017

It's always nice to deal with a retailer either online or brick/mortar that knows what they are doing. As a normal thing I am Larry about internet companies I've never dealt with. I search them and look for comments not on their own website. etrailer is definitely an anomaly with respect to a line retailers. They stock good products and explain those products. They charge a fair price and ship right away. The Tekonsha wiring harness I bought is great quality and is simple to install. Even an automotive novice could install this harness using etrailer instructions. I certainly recommend them again and use them again. 430326

by: DP01/12/2010

Best value no-mod 2009 Kit It works fine on a 2009 Tacoma Double Cab 4x4 Longbed. The LED drivers are sealed inside, so they still take the standard 12v input. It even works without drilling as is shown in the video. There are grounding bolts on the body behind the light housing that allow grounding with the included nut instead of the self-tapping screw shown in the video. Acetone was used on the grounding bolt as well as the sticky tape mounting surface. A small amount of grease was used on the grounding terminal to prevent corrosion. Skip the dealership - ten minutes and a 10mm socket is all it takes. 2639

by: Buck C.01/02/2017

Everything you guys promised I received and the shipping was incredibly fast. I did have a little problem with the location of the hardware for the hitch. I just wasn't thinking to look in the hitch itself and was looking in the box for a bag or a smaller box, but I found it quickly enough. Everything else was just as it should be. Bolt holes lined up. The wire harness worked like a dream. Thanks so much for the awesome installation videos. They really gave me the confidence to make this purchase knowing that I would be able to install this myself and save a lot of money by doing it. 331395

by: J Locke05/11/2012

Customer Service is impeccable, priced right and very easy to install. The similar part which was aaftermarket from Toyota had directions to install up front of truck in the area of the fuse box and then routing the wiring underneath to the rear section- impossible to understand, plus Toyota wanted $125 for the part! This was a great father / son project for my Dad and I to install on my 2012 Tacoma. I can't say enough positive things about etrailer.com, this is a quality product, priced right and easy to install. Thank you etrailer for the service you provide! 40103

by: Rex A.08/01/2017

I gave you a 5 star even though UPS tried to mess up your excellant delivery time. they sent it to the wrong PO so instead of getting it 3/17 it came on 3/20. it attached easily per instruction and video. the only improvement I made was to encase all the wiring in flexible conduit. when finished everything tested perfect. thank you very much. 413384

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by: Don P.04/12/2013

The light kit came in the same box as the hitch so it arrived in perfect condition and only 4 work days after I placed my order. I've done a lot of hitches in my time and even more wiring but this is the simplest I have ever done! Installation actually took less than 15 minutes, a couple of bolts on each side to remove the lens, unplug the harness and plug it into the new wiring and the new wiring into the old housing, route it out to the hitch and use the supplied zip ties to keep in place - Done! Life made fast AND simple! 75527

by: Richard Littlejohn01/09/2012

In review of the T-One Connector with Upgraded Circuit Protected Converter, I can't say enough good about etrailer's excellent products and services. There was a complete ease in the ordering process; item shipped fast and exactly as described and pictured. The item was great quality and easy to install. The follow-up from etrailer from the order process, withshipping details, and even after receipt of the item was exceptional customer service. Etrailer.com is the place to come for any all wiring and adapter needs! 29348

by: Paul M.04/13/2017

I own a 2015 Toyota Tacoma 4x4. I bought this harness so I could tow my Harbor Freight trailer and do a direct plug in. The harness works great and is easy to install. Just be aware if you bought a Harbor Freight trailer there are issues getting the lights to work correctly on the trailer and not the Etrailer harness. I did get my lights to work on my Harbor Freight trailer but not without some head scratching and using Google. One more thing, buy Etrailer's bracket for the 4 pin plug, such a clean set up. 367094

by: Rodríguez12/24/2014

Install was as easy as 1, 2, 3. Used more tie wraps then we're sent but other than that... Perfect. 166793

by: Mark Wood05/28/2013

I ordered T-One wiring harness for my '96 Toyota T-100 late in the day and got an order confirmation immediatley and then got an e-mail saying it was shipped that day. I got it two days later and installed on truck. Easy to install even on a 17 year old pickup that had never had the connectors apart. Thirty minutes or less is all it took. Had to find my tools that my son borrowed. My son recommended this company from reviews he had from DFWStangs.net forum members. Thanks guys. 82142

by: David H.03/22/2017

My harness was exactly what I was told it was. All I had to do was plug it in and was done in less than ten minutes. Took longer to get the bolts out of my lights. My old wiring harness had quit working and I went to the Toyota place but the wanted 100 bucks for a harness and I would have to take the fuse box out of the dash in order to put it in. With etrailer the saved me hours worth of work and more than half the cost. Will definitely recommend this to anyone who needs one. 357268

by: FShams02/06/2018

I had been looking for a solution to securely add a 4 way flat connection and be able to plug in my Rear LED light bar to. The product was accurate and very easy to install in less than 15 minutes. All plug-n-play. Very happy with the final result. Thank you 473295

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by: Eric S03/12/2012

Tacoma 4-wire flat harness went in EXACTLY as the instructions said. It's not so much the product, which was excellent, but the great installation video that was available on the eTrailer.com site that convinced me to buy it here. Etrailer.com has always impressed me with the quality, and equally as important, the service. Big or small, every order ever made through etrailer.com has been handled with the same outstanding service and care. Thank you! 33680

by: David L.06/19/2013

After watching the on-line youtube video I decided to purchase a wiring harness. It took me about 20 minutes to install when it arrived. Everything snapped together just like the instructions said and when I tested it, all the lights worked exactly like they were supposed to. I am extremely pleased with the quality, price, and simplicity of this product and would not hesitate to recommend this site to anyone in need of a trailer wiring harness. 85328

by: Bertram D.05/23/2016

Easy install even though we worked on the ground. We did not remove the bumper just supported it. We removed the two top bolts that hold the hitch and installed the hitch with the four bolts, loosened the other three and installed the shims separately. Once all the bolts were started we tightened everything down. Great product and also easy install on the wiring harness. Took us around 90 minutes for everything. Thanks great products...Bert D. 251217

by: It works just fine.01/05/2014

Installed on a 2006 Toyota Tacoma PreRunner. The old computer term "plug and play" would explain it. Watch the video if you don't know how the tail light covers come off. Simple to install. I took the extra step of covering the wiring with split loom and the wrapping that in electrical tape. That way there would never be a chance of wires rubbing against metal and causing a short over time. I used a few extra zip-ties too. 111959

by: April Hunting12/06/2012

Haven't had the opportunity to use the product, but I will say customer service will bring me back. I had a person that was available by name through the whole process. I hate having a generic email and number so you get a different person each time and have to explain the issue each time. Even though I haven't used the part yet, I know if I do have an issue who to go to. Thank you for such personal customer service. 60803

by: Gary H06/23/2012

Nice quality, easy installation, took the time to add corregated sleeving insulation to protect the wiring (plan to keep the truck a long time). Adding the sleeving took a little longer but the installation looks like it came from the factory. I would recommend this product this system to others. The only thing I would have liked to add would be an optional mounting bracket for the trailer connection to bumper. 45387

by: Gary M12/10/2012

Great product. Added trailer wiring harness without cutting any wires. The new wiring pretty much follows existing cables. Worked the first time I plugged it in. I was able to zip-tie an existing cable so that there should be no issues with any sharp edges cutting the new wires. Make sure you use a bright light under your truck to see where the existing wires go. It's hard to see the existing black cables. 61056

by: Adam D.08/29/2011

Quick and easy connection on my 2008 Toyota Tacoma. Just pop off the tail light assemblies, run the wires underneath the bed, connect the wiring harnesses, reconnect the tail lights and you are ready to go. At the most, it's a 20 minute job. For best results, use some electrical contact grease (p/n 11755) on all of the connections to ensure a smooth, water resistant connection and to avoid corrosion. 22995

by: Edwin T.10/18/2013

I ordered this item to replace one I got 5 years ago that started to work erratically (most probably after several years of launching my boat in saltwater without disconnecting the plug!). It is a very easy installation and "like-factory" fit. I did notice that the main circuit box is smaller than the one I'm replacing so for me is a plus since it will be easier to hide behind the light fixture. 104256

by: JDUBYA12/31/2010

Quick & Easy I am very happy with my purchase from etrailer. I placed my order for several parts on Tuesday morning. Best pricing I could find anywhere. I opted for the Free 5-7 Day shipping. Order shipped that day and was received Thursday around lunch time. That's quick!!! Everything I ordered was in the box. Installation was as simple as promised. Overall A+ rating from this guy. 4824

by: TXM08/04/2011

The harness is easy to install following the enclosed directions and results in a nicely finished installation. Although more costly than bargain basement wiring harnesses, using a custom designed wiring harness eliminates the need to cut and splice wiring and makes for a lot cleaner and easier installation. It is well worth the difference in price. Shipping on the item was very fast. 21132

by: Paul Smith05/01/2017

Harness Fit well: the Black and Yellow wires go on the drivers side and the green wire goes to passenger side it tells in the instructions. You need to purchase some black wire mold and black tie wraps to make it look factory. when you take out tail lights pull light assembly straight out. then you can access the plug. great service, wiring harness is a great product. thanks etrailer 374571

by: Stephen11/08/2017

This product was nicely engineered to be fast and simple to install. The instructions were right on with how to get to the lights and the underside of the bed/bumper area. Don't drop the light when you unclip the wiring to each side tail lights and use the zip ties to keep those wires from dangling later. For the most part it was piece of cake, you do need a few tools.... Steve 450262

by: Lcrain01/08/2016

Had a hard time finding the right wiring harness kit to hook up trailer lights on my new Tacoma. Found your web site, you had exactly what I needed, so I placed my order. It was shipped to me in just a couple of days, and I am ready to rock and roll. There was even an instructional video showing how to connect everything on my specific truck. I highly recommend these folks! 235048

by: Wally L.11/16/2014

I just purchased a 2015 Toyota Tacoma 4x4 and installed the Curt hitch receiver purchased from etrailer. Great product and videos made it a snap to install. I also ordered the T-One wiring harness and this was a piece of cake to install and works great. I think I saved over $220 in parts and labor compared to similar items at the trailer companies in our area. 161156

by: Corey J.07/07/2016

This product was exactly what I was looking for. The online tutorial was helpful in assisting me in making my decision; demonstrating how simple and straightforward installation would be. Having the flat plug mount available was an added bonus and will insure that the plug is not damaged once it has been installed. I am very excited about installing this kit. 269154

by: sierra sam04/07/2017

Just received my hitch receiver, harness and lock pin and am amazed that all my items made it intact. The box it was shipped in sure didn't. Great job packing some tough items! I will install the receiver as soon as I can get the instructions which did not come with the item. Also, the link for the instructions on the web site does NOT work for my Mac. 366807

by: Brandon B.06/29/2012

This is a very good quality wiring harness. Install was simple and, looking at the back of the truck, you will not even know it was there. The wires were plenty long enough for my Tacoma, and the connectors just snap in. I will probably rarely tow a trailer, but its nice to now have the ability when that is needed. etrailer.com is great to deal with. 46099

by: Ken D.03/27/2011

This fitted perfectly and was very easy to install. You don't have to cut any wires or splice anything together. You just remove the taillight assemblies, plug the adapter plugs into the back of the light plugs and also truck wiring loom plugs, and reinstall the light assemblies. It's worth the money of not having to cut and splice. Very simple! 10477

by: Charles C.08/16/2012

I ordered the items on Monday, and received them on that Wednesday afternoon. I had the trailer hitch and the wiring harness installed in about 2 hours. The hitch installation requires two persons, but goes easily. The wiring was as easy, but I made it more difficult by using loom to protect the wires. Probably took 30 minutes longer that way. 51938

by: Russell P.04/23/2014

I ordered this trailer light harness from etrailer.com for my 2007 Toyota Tacoma because the factory plug stopped working. I received it in 3 days regular mail. Installed it in about a 1/2 hour and works great, this is my first order from etrailer.com but will be glad to use them again for any of my trailer needs. Thanks etrailer.com, 126752

by: trailerman01/12/2012

I bought the trailer harnesses for two trucks, a Toyota Tacoma and a 2011 Nissan Frontier S. Shipping was quick and so was installation. They just plugged in to the truck's wire harness on the chassis and I was in buisness. No muss, no fuss, no cutting wires, no twisting wire nuts, no cussing or pulling hair. Just plug it in and trailer away. 29565

by: RJ06/29/2017

Took off 1 star because shipping took 9 days to receive, other than that everything arrived in good shape packaging was perfect everything went together flawlessly after watching a couple of the very helpful videos. now all that is left is test it out on a trailer. I will definitely pick up all my trailer needs from etrailer, Thanks guys 401330

by: Rich04/10/2012

I bought this wiring kit for my 2012 Tacoma...it took about 90 minutes to install becouse the wiring is about 18 inches too short...after splicing in longer wires....product works good....toyota restyled these trucks for 2012....so the company needs to adjust the length of the wires leading to the passenger side....otherwise easy to install 36795