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

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

Item # 118745
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Custom Fit Vehicle Wiring

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118745 - Custom Fit Tekonsha Custom Fit Vehicle Wiring
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In Use/Installed

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. Powered ModuLite reduces strain on wiring system. Call 800-298-1624 to order Tekonsha custom fit vehicle wiring part number 118745 or order online at etrailer.com. Free expert support on all Tekonsha products. Guaranteed Lowest Price and Fastest Shipping for T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
  • All Info
  • Reviews (36305)
  • Q & A (2)
  • Videos (4)
  • Photos
  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118745

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • Powered Converter
  • Tekonsha

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. Powered ModuLite reduces strain on wiring system.


Features:

  • Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights
    • Compatible with 5-pole, 6-pole and 7-pole adapters (sold separately)
  • Connects quickly and easily
    • Locate connection points in rear cargo area
    • Plug in T-connector
    • Run hot lead to car battery
  • Includes ModuLite power converter to ensure that your vehicle's wiring matches that of your trailer
    • Powered module connects to battery to avoid overloading vehicle's electrical system
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


Specs:

  • Maximum amperage:
    • Stop/turn lights: 4.2 amps per circuit
    • Tail lights: 7.5 amps per circuit
  • 1-Year limited warranty


Installation

This custom-fit T-One connector plugs into your vehicle's wiring harness, which is located inside your rear cargo area. You will have to remove the storage trays and some interior paneling to access this harness. Once you've plugged in the T-connector, run the hot lead up to your car battery. Connect the lead to the included fuse holder, and then connect the fuse holder to the positive terminal on your battery and insert the provided fuse.


Once installation is complete, the 4-way flat connector will be stowed in your rear cargo area.


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.


ModuLite Powered Tail Light Converter

A ModuLite power module 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. This power module functions as a tail light converter to combine 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.


With a ModuLite, your trailer's lights will be powered without overloading your vehicle's electrical system. Because the module draws power directly from your car's battery and bypasses the electrical routes that are used by a basic wiring harness, there is virtually no draw on your tail light circuits.



118745 Tekonsha T-1 T-Connector - 4 Wire - Modu-Lite Converter Included



This Product Fits The Following Vehicles



California residents: click here


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

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Tekonsha T-One Vehicle Wiring Harness Installation - 2019 Buick Encore

Clayton: Hey guys! How's it going Clayton here at etrailer.com. And today, we'll be taking a look at and I'll show you how to install, Tekonsha's T-One Connector Harness on our 2019 Buick Encore. So what our four pole trailer wiring does is allows us to tow a small trailer safely. That'll give us our turn signals, our running lights and our brake lights. And one thing I really like about this kit is our dust cover. It's part of our plug.

So we don't have to worry about losing it or falling off. And it can be used as a temporary foot wire holder. You can put it around your safety chain loop and clip it in there. We don't have to worry about our wiring.A really nice feature about this kit is it's all plug and play. All you have to do is plug our wires into our taillight wires, run our wires to our passenger side.

Then run a power wire up to our engine compartment. Overall, it's a pretty easy installation. Speaking of installation, I'll walk you through how to get it installed now.So to start our installation, we can open our trunk. We're going to have a cover right here. We can just look it up on our cargo liner and set it aside.

Now we're going to go ahead and remove our tie-downs. You'll use a 10 millimeter socket and take that out. Now we can go ahead and remove our plastic liner. All you have to do is pull up. This'll come right out.

Now we have to take out this T45 screw. This holds down our styrofoam liner. With that loosened up, we'll be able to shift this out of the way. Now we can go ahead and remove our access panel right here. We're going to use a nylon pry tool. There's going to be a little slot right here, where we can stick our tool. There's enough room to get our hand behind there. Then remove our panel.Now we can go ahead and remove our taillight plug located right there. You can reach in with your hands and pull out our plug. All you have to do is push down on this little tab. Now we need to feed our wiring up through here to our plug. I'm going to take an airline tube. You can obviously use a coat hanger or a rope with a string. Anything that you can get to drop down here. So we'll stick our airline tube down and grab our airline tube. Then I'm going to take some electrical tape, make sure to get enough tape on there, to where if your wiring does catch anything on the way up, that it won't pull off. With that taped on, we can pull it up and remove our airline tube.Now with our wiring fed in, we can grab our plug. Add our new plug from our wiring kit. You'll make sure you want to hear that click in. Then we'll take this end and put it right back on our taillight. And before we took all of our wiring up underneath our vehicle, I'm going to go ahead and re-add our panel since we are done on the side. This can be tricky because you have this cargo compartment. But you can take your time. Should be pretty easy. And before we can add our wiring, we have to take off our access panels.Then there'll be another little plastic panel here. We'll take that same pry tool and pry this out. And you don't want to pull too hard, so we don't break our tabs. And now we have our airline tube ran from our access panel down through our bumper beam and out our hole here. I'm going to go ahead and take our plugs to our airline tube and get that pulled back through. Again, you want to be careful that way we're not pulling any wiring or snagging anything. So after we got our wiring run through our bumper beam, there wasn't quite enough room to come up the outside. So we're going to go up underneath this access panel, just like we did on our driver's side.So we can go ahead and remove our plug and take our new wiring. Make sure our channels are facing up. Snap that in, take this side, plug it in there. Now what I'm going to do, since we have a little bit of extra wiring. Is I'm going to fold this over and zip tie it together. So we do have a little bit of exposed wire here. I'm going to go ahead and zip tie that to our factory wiring. And I'll repeat that on our driver's side as well. So now I'll go over our wires ran to our taillights. We can go ahead and mount our box. I'm going to use our two-sided tape. It's important when you're mounting this, that you're not going to amount around anything hot or moving. And in this case, I'm going to mount it right here behind our styrofoam tray.So we can go ahead and stick our box in. I'm going to try to move it as far back as I can. Right there it's pretty hidden. Now still give us room to run our power wire and our ground. Now I'm going to go ahead and take out our spare tire. You don't have to, but it's just going to give us a little bit more room one. When we're mounting our ground wire. Now we can take ourselves tapper and Mount our ground. You want to make sure to mount somewhere that, if you have to take your spare tire out, you won't rip this off accidentally.I'm going to go ahead and go right here. I've already cleaned it off with some rubbing alcohol. So we know we have a clean surface. So we can take our self-tapper and run our grounds. So with our ground wire ran, I'm going to go ahead and leave our spare tire out just for a little bit more room. Now we're going to go ahead and connect our black wire. So we'll want to strip it back, twist together. And I did cut it a little bit long. So we'll trim the ends. Take our butt connectors provided crump it down. I always like to get both sides, just to make sure. Always give a good little pull. Just to make sure our won't come off later. So then we'll take our black wire from our kit, twist that. Add our butt connector and crump it down. And again, I'm going to give a little tug. We know we're good. So now I can wrap this up electrical tape.So there are a couple of ways that we can go about manning our four-pole wiring. A lot of people leave our wire like this. Just put it in their spare tire compartment. And then take it out when they need it and just drape it over our gasket. Our customer wants a four-pole mounted down on the hitch. So there's a grommet down here. And I'm going to take our four-pole wiring and our power wiring. And then I'll cut a slit in the side and then we can slide our wiring through that grommet. So at this point, If you want to put all your components back in your trunk. Feel free to do that. So you'll have to add your spare tire, add the cover and our paneling on our passenger side.Now we're going to run our power wire up to our engine compartment. I'm going to try to follow the frame rail as much as possible. You want to make sure to stay away from anything that's hot or moving. I'll go ahead and run my wire. And I'll show you how I did it. I ran it right under here under our bumper beam, up behind this bracket and over our exhaust hanger bracket. Then there was a hard line right here. And I zip tied that to the hard line all the way up through here. And then right there, I came down to our brake line bracket and up our brake line a little bit, under this little shield here. And then on the other side of the shield. I came through our frame rail here, all the way up to here. And then I dropped down our airline tube. I'll tie these together and pull it up along this firewall. Now with our airline tube connected to our wiring, I can go ahead and pull this up.And again, you want to make sure this isn't going to hit anything hot or moving. Now I'm going to take a zip tie and zip tie to this factory wiring here. So we want to make sure that our fuse is not in our fuse holder. And then we're going to cut right here in the middle. Now that'll give us a good idea of where we need to cut our wire for power. So if we put it there, that should come right over to our battery pole very nicely. So I'm going to cut our wire right about here. Now we can take our wire and strip it back. Add our butt connector, before we grab our fuse holder. Strip back part of this, add it to our butt connector. Give a little tug and make sure we're good. Now I'm going to throw some electrical tape over that just to ensure any connections.Now we can check and make sure we have a good length to connect to our battery. I'm going to come right here to this bolt and that looks pretty good. So we can go ahead and strip this back and add our ring terminal. And we can go ahead and crump that down. So we're going to use a 12 millimeter socket. We'll take off that bolt. And then we can add our ring terminal. Now with our fuse connected, we can close our cover and make sure there's room. We don't have to do any trimming, which is nice.So we know we're ready to add the fuse. And we'll take our 15 amp fuse provided in our kit. Add it to the fuse holder, close our cover. And I'm going to tuck ours down here to the side. And now with our tester hooked up, we can go ahead and test everything out. We'll start with our brake lights, our running lights, our right turn and our left turn. So now that we've tested everything. We know we're ready to hit the road. That's going to do it for our look at and installation of the Tekonsha T Connector Harness on our 2019 Buick Encore..


Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118745

Average Customer Rating:  4.8 out of 5 stars   (36305 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. Powered ModuLite reduces strain on wiring system.

- 118745
by:

The hitch was sent on time and in good condition, the installation was easy and fast, instructions were easy to follow, electrics kit was plug and play. Only downside is after 1 year the paint on the unit is starting to peel and rust is forming



- 118745
by:
2020 Buick Encore

I was suprising pleased how easy it was to install this wiring kit. It's mostly all plug and play connections except for a grounding wire and getting a hot wire from inside rear of vehicle to the battery in front. All the videos show that you just remove a black rubber cap slice a hole in it feed the wire through it and snap the cap back in place. But on my 2020 model the rubber cap was already being used by a factory wiring harness so you had to make a hole in the cap beside the wiring harness that was using this space. Other than that and fishing the hot wire around brake lines up through the frame up to the battery ( not hard just time consuming) it was a fairly easy installation. I definitely give this kit a thumbs up!!!



- 118745
by:
2018 Buick Encore

Very pleased with the merchandise I Purchased easy to install



- 118745
by:

Great people to work with, very helpful and polite would highly recommend



- 118745
by:

Was simple and easy to install. Company shipped it fast! Thank you!!



- 118745
by:

Arrived in a few days. Easy to install (20min) Thanks



- 118745
by:

Easy to install and still working perfectly one year later.



- 118745
by:
2018 Buick Encore

Installing it was easy for me.



- 118745
by:
2017 Buick Encore

Excellent product, installed easily just like shown in the installation video. Kudos for having the installation videos available!!



- 118745
by:

very helpful and fast shipping



- 118745
by:

Great price along with customer service! Received on time without and damage.



- 118745
by:



- 118745
by:
2020 Buick Encore



- 118745
by:

fast processing and shipping, good pric es.



- 118245
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Plug and play. Hitch was placed on a board and jacked up to meet the bolt holes. Remounted the two tow hooks. Not a lot of extra threads but they all fit perfectly. Glad I had an impact. Wiring had to remove protective cap and plugged in. 4 runner already had a fuse in the box. Bought the 4 flat plug mount but drilling up into hitch proved to be to much so just used a good hose clamp to secure the plug. Also more adjustable wire length if needed.



- 118258
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Product quality very high, delivery very fast, shipping container (cardboard box) was not strong enough to support handling/shipment, box bottom was ruptured with hitch assembly hanging out, box should be supported stronger, no parts missing, hitch was scratched up somebut, nothing that a little black paint didn't fix. I installed the wiring harness connections and fuse box on the external side of the vehicle to eliminate having to take apart the internal sheet metal panels and providing easy access to the fuse in the event of fuse failure, this eliminates the necessity of interior Panel removal to change a fuse. Easy installation, product has great great design features ,great customer service with prompt delivery. Just ordered the bracket (#18140) to secure the 4 prong plug to the hitch neatly and secure to eliminate the loose plug. (not shown in photos (Bracket in transit),


Comments
Great, works like a charm.
Anthony J - 09/27/2020


- 118265
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


This kit is very easy to install on my 2012 Honda Pilot EX-L and came with almost everything needed to install it. It was only missing 4 screws to secure the 7 pin plug onto vehicle’s the plastic trim but any type of small screws or bolts would work. Definitely recommended to anyone who’s looking to install a 7 pin trailer harness.



- 118241
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Becuase if this website it was easy to find what was needed for my truck to tow. Very detailed installs online. The best part was everything was bolt in and no drilling required along with plug and play wiring harness. Definitely will be another custom tee in the future!



- 118252
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Just installed Draw Tight hitch, wire assembly along with the brackets for a nice look. Everything went smooth with installation and it has a nice clean look as the hitch is well hidden. This is going to work for our bike rack and the cargo carrier I am now going to by. Now I can also get a small utility trailer to pull and haul stuff. I strongly recommend etrailer for all your needs as they communicated with me the whole way through and readily replaced a lock unit that somehow came without the key. Customer service is top notch.


Comments
Absolutely Fine!
Scott N - 04/26/2020


- 118264
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


This is a perfectly tailored product for the do-it-yourselfer who with a little help adds a nice hitch to his vehicle. Getting an older vehicle's OEM installed weld nuts clean takes most of the time followed by installing the two washers and nuts in the fascia area. That part needs patience as the work area is limited. The Curt LED 4-Way Flat Connector (Vehicle End) Tester makes it very simple to verify the Tow Package - 4-Pole Flat Trailer Connector that is a snap to install to the vehicles pre-existing harness. One point to pay attention to in the instructional video is when pulling the square washer and bolt through the channel. They must slide in single file as shown. If you try to pull with the bolt through the washer it will get stuck and you will need to fish it out. So bottom line. Great product. Great support. Steve Stewart


Comments
Everything from the hitch to the wiring still works perfectly. Very pleased with the results
Stephen - 05/07/2020


- 118265
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


I purchased this for my 2013 Honda Pilot EX-L. I have not used the wiring harness yet, but the installation was extremely easy and quick. The instructions were very straightforward, and I was able to install everything within 30 minutes. Everything you need is inside the package except some bolts/nuts to mount the connector. I decided to cut out a hole and drill some holes for bolts. I opted for some black ones to match the colors. I'm extremely happy with this product and etrailer's fast and reliable service.



- 118248
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Wish I bought etralier's tow harness earlier. Easy installation. Toyota dealership sold me the wrong one and of course waited too long to return. But use some of the parts from that harness on the one from etrailer(see pics). Would order again from etrailer. Thank you



- 118269
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Plug & play for 2020 Kia Sorento. Dinged a star because the trailer connector does not fit the extra bracket well. It does not appear to have been designed for a bracket mount. I had to force fit and secure in place with a zip tie.



- 118265
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Needed a harness for my 2015 Honda Pilot LX and didn’t want to pay a king’s ransom for dealer parts and install. Ordered from etrailer and got a deal. Came with everything I needed and also had excellent, easy to understand instructions. Works perfectly.


Comments
This harness has worked like a charm. No problems at all.
Randy B - 06/01/2020


- 118266
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Good product and great service from etrailer! !!!Important note: 2012 Nissan Xterra (depending on what factory it was built) has the 12v power and brake wire REVERSED on the factory installed harness. Meaning when you plug in your trailer, there will be constant power to the brakes on no power to the charge line. If this happens to you like it did to me, you need a tester and a couple butt connectors to make the switch at the 7 pin connector. Also note, these plugs use the trailer for the ground so you're tester wont read if the trailer is not plugged in and you have to hold one of the tester ends to metal on the trailer.


Comments
Thank you for your review. This is a common issue on the Nissans. I have attached a very helpful article that explains the issue and how to fix it.
-- Etrailer Expert Heather A - 05/12/2021

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Ask the Experts about this Tekonsha Custom Fit Vehicle Wiring

  • Parts Needed to Transport 2 Dirt Bikes with a 2017 Buick Encore
    If you're talking about BMX dirt racing bikes then I recommend using the Draw-Tite Class II Trailer Hitch # 36554 on your 2017 Buick Encore with a bike rack like the Saris Freedom # SA4412B to get the job done. If you're wanting to transport actual dirt bikes then you're going to need to add the T-One Wiring Kit # 118745 and a ball mount kit like part # 36061 with a 1-7/8" # 19257 or a 2" # 19258 hitch ball so that you can load the bikes up into a trailer. The reason you'll need to...
    view full answer...
  • Draw-Tite Hitch for Mototcycle Towing With 2018 Buick Encore
    The Draw-Tite Class II hitch # 36554 is rated for 300 lb tongue weight and 3,500 lbs towing, most small utility/motorcycle trailers and one dirt bike would be less than this max range; please reference your trailer and motorcycles weight for an accurate assessment. I highly recommend that you refer to your specific vehicle's owners manual prior to towing. My research, the online manual I have available (Part No. 84098804 B Second Printing), has a statement on p197 "The vehicle is neither...
    view full answer...

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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Joshua S
Video by:
Joshua S
Employee Zach D
Video by:
Zach D
Employee Jonathan Y
Video by:
Jonathan Y
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
Chris R
Employee Cole B
Installed by:
Cole B
Employee Alexander C
Written by:
Alexander C
Employee Shane H
Test Fit:
Shane H
Employee Ryan G
Test Fit:
Ryan G
Employee Clayton O
Test Fit:
Clayton O

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