T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
(49 reviews)
Price: $43.08
In Stock
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
Item # 118778
Retail:$55.96
Our Price: $43.08
You Save: 23%
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- Reviews (49)
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Tekonsha Custom Fit Vehicle Wiring - 118778
- Custom Fit
- 4 Flat
- Trailer Hitch Wiring
- Tekonsha
- Powered Converter
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. 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 point on the back wall of the cab
- Plug in T-connector
- Includes ModuLite to ensure that your vehicle's wiring matches that of your trailer
- Powered module connects directly 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-connector plugs into your vehicle's wiring harness. The connection point for the T-connector is located towards the center of your vehicle on the back wall of the cab. The converter plugs into the gray 12-pin tow plug. Once you've plugged in the connector, insert the included fuses into your fuse panel as indicated in the instructions.
Once installation is complete, the 4-way flat connector will be stowed beneath your vehicle, under the bumper. Secure the connector with the included cable ties.
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.
118778 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite
Installation Details
This Product Fits The Following Vehicles
- 2017 - 2024 Honda Ridgeline
California residents: click here
Customer Satisfaction Score:
91% were satisfied with this product
9% of customers were not satisfied
- Wrong item was ordered
- Defective
- Product did not meet expectations
Customer Reviews
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118778
Average Customer Rating: 4.5 out of 5 stars (49 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. Powered ModuLite reduces strain on wiring system.by: Mick03/14/2022
2020 Ridgeline Sport 2WD. Kit did not work until I added a relay to my truck. Kit is not complete and does not include relay. etrailer was no help except for sending me a replacement kit. Had to troubleshoot on my own. So first of all when you are looking for the connector to plug the unit into, look and see if you have relay in relay socket next to it on back wall. If you do not have the relay you will need it. So you must purchase it yourself. I have pictures of what you will need.
by: Chuck C06/27/2020
Product was expected. Easy installation instructions clear. Looks professional.
by: Mark03/06/2023
After hooking up harness,I was only able to get flashers, blinkers and brake lights to work. Did not have any parking lights. After talking to tech support 2 two times I was still not able to get lights to work. Upon doing a google search to hopefully find a fix, I found multiple complaints from other people having the same problem with no fix results. I will be returning the harness. Would have given 1 star but brakes and blinkers did work.
Jenny N.
3/7/2023
I have heard that with some Ridgelines there are additional relays that you would need to purchase from Honda or an auto parts store to use in addition to the fuses that come with the kit. I recommend consulting your vehicle manual for more information.
by: John 04/23/2023
2019 Honda Ridgeline
The installation itself was fairly simple, the hardest thing was to find the T connector connection point in the vehicle. After that was found, it took a few minutes to install and everything works great
by: Craig 09/22/2023
Works well. Fairly easy to install except for part behind rear seat back. That was tricky. Used you tube for that.
by: -Todd09/14/2020
This harness kit is the only answer to solving the locking tail gate issue with my 2017 Honda Ridgeline. This kit was a breeze to install and has worked flawlessly since I installed it. I am mechanically inclined so it went in easily, but I can see if you're not so mechanical it may be a little difficult. It is great product and works just like it would if installed at the factory!
-todd
9/15/2021
Works great! No issues.
by: Gary04/19/2019
2019 Honda Ridgeline
The product is high quality and the instructions are very good. It took me about an hour to install and worked perfectly when complete. I would recommend it. The only difficult part was finding where Honda hid the gray plug for the powered converter module behind the back seat and behind the sound deadening material.. Be patient and persistent and you will find it.
etrailer is always my “go-to” supplier for anything towing related.
Gary
4/20/2020
Works fine. I recommend it.
by: Woody C12/16/2020
Very easy to install. Very comprehensive with good instructions and also video footage that was helpful. This kit is an excellent solution for owners who want 4 pin trailer hookup.
Woody C.
12/17/2021
Very good. Works exactly as represented. No issues with the wiring harness. Quite pleased with its use.
by: Christian10/06/2021
2018 Honda Ridgeline
The product is great and works as expected ! And WAY WAY cheaper than a Honda part ($260 !!!).
However, install instructions are poor, and incorrect. At least for my 2018 Ridgeline. I had to download instructions from Honda at the dealer. And they were even worse !!! I figured it all out without having to take half my car apart. It took 10 minutes to install. Will share instructions elsewhere.
Jenny N.
10/22/2021
I agree that the pictures in the instructions do not do a great job of telling you where to look for the connectors on the 2018 Honda Ridgelines. If you look at the installation manual on the product part for the Curt harness part # C56365 there are better pictures to show where the connectors are.
Helpful Links
by: Edwin04/26/2019
The support that eTrailer provides for their products is unequaled. Shipping is quick. Thanks, eTrailer.
- Ed
Edwin
4/26/2020
It does didn’t work, there was no place to plug in the module like the photo showed I can only assume that there is a difference between the Sport model and the regular Ridgeline.
Heather A.
5/21/2020
The T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118778 is compatible with 2017 - 2020 Honda Ridgeline all styles including the Sport. The black box module will plug into the 12 pin connector. First, remove the rear seat trim panel to access the connector area. The 12 pin vehicle tow plug connector will be located near the green relays on the driver’s side. The square plug of the towing harness will plug into the factory gray plug shown in the instructions with an arrow pointing to it. There is a cap on this plug that needs to be removed by sliding it rearwards. It has locking tabs as well so press down on those and that should remove the protective cap carefully.
by: DAve B01/08/2019
2019 Honda Ridgeline
SO far very poor instructions. I mean really the photos do not match my truck, they are not clear at all. They make it sound so simple, but I still cannot find the harness connector in the back seat of my brand new truck.
Mike L.
1/10/2019
I have linked you to instructions for the Curt application for your 2019 Ridgeline. Curts photos and written description are much more clear and easier to understand, and should help you complete the installation. The Curt harness looks a bit different than the Tekonsha model you purchased, but they would install in the exact same manner.
Helpful Links
by: Mark 07/02/2023
2019 Honda Ridgeline
Item arrived earlier than quoted.
Kit was fairly easy to install with the included directions.
Everything worked perfectly the first time.
by: Antonio01/14/2021
2019 Honda Ridgeline
Thanks for the on-time delivery of my Tekonsha # 118778! I just had to send a follow-up question to Mike L. as it seems like this 4-Pole Flat Trailer Connector is not really designed to fit my 2019 Honda Ridgeline. As I tried to follow step 2 of the enclosed instruction that came with my connector, I had to remove the backseat, and I did not find any connector for me to plug the T-One T-Connector’s black box module. Please provide additional guidance for I am on a “stop” mode and could not proceed with the installation. Your help with this matter will be greatly appreciated.
by: Malcolm09/03/2018
2017 Honda Ridgeline
Just finished installing the T-One Trailer connector on my 2017 Honda Ridgeline RTL-T. Installation was not too difficult. Instructions were sparse with respect to exactly how to locate and access the plug on the back firewall. Also the instructions on how to remove the cover on the plug under the rear bumper were not very helpful. A short video on these tricky things would help immensely. How and where to attach zip ties or sticky tape is not needed. Beyond that I am very pleased with my trailer connector.
by: Brad05/17/2019
2019 Honda Ridgeline
The four wire trailer kit installed successfully on a 2019 Honda Ridgeline RTL-T. Installing the black box module is easy once Honda's connector is located behind the driver's side rear seat. Carefully remove plastic panel (near floor) next to where seat belts bolt to frame. Panel has two flexible tabs near top - one on either side of the seat belts - that must be carefully moved a bit to release the panel at top. Check other reviews for photos on locating the cable (it's the thicker one) and connector that plugs into black box. The connector will be tucked behind some thin insulation material. Gently pull it down to expose connector. Its cable shroud is tied to back wall at one point but there's enough slack to connect to module. Secure the module to your taste, install three fuses under hood, and finally connect up trailer cable (very easy). Don't forget to grab the boat and trailer then head to the lake.
The kit has high quality parts.
by: Some guy09/14/2022
The product performs as expected and advertised. The install may be a bit trickier than the video shows based on the placement of the hookups behind the seat cushion.
by: Tony J04/24/2020
2019 Honda Ridgeline
The trailer turn signal control module kit worked perfectly when installed and still does a year later. Honda wanted over $200 for the kit. E-trailer's kit was less than $40 dollars. Couldn't be happier!
by: Anthony07/13/2019
Great product. Horrendous instructions. The instructions have one picture to show where to mount the module. In black and white! I could not find the connector for the module for my vehicle. Called support two separate times and could not find it. Finally through another review there was more detailed information. There really needs to be 1st hand knowledge on how to install these for all different models. I figured since it was a for a honda it would show me exactly where to go. But all in all figured it out. Works fine. UPDATE the instructions with color DETAILED pictures!
by: Kelly11/19/2020
Everything I needed was provided. I did purchase a tube of the connector grease and a plate to mount the connector so it wouldn’t flop around. I had found the gray 12 pin connector behind the rear seat before the product arrived so I was pretty confident that it should go well. The gray 12 pin connector was the hardest part. It was not visible so I had to tug on the cable that the arrow in the directions pointed to a little. Also just getting your hand in there to find it and maneuver was a little difficult. But everything was about as straight forward as I could hope for.
by: Raphael02/15/2019
2019 Honda Ridgeline
etrailer is my place to go whenever I need towing harnesses, wiring, etc. Always professional and great service.
by: Roy 10/30/2020
2018 Honda Ridgeline
Total installation took about 15 minutes. Access to the 12 pin connector involved removing one plastic panel under the rear seat. The connector is against the rear cab wall. Under the bumper connector dummy plug...best if the connector is removed from the frame first. It slides off the frame clip once the tab is pushed.
by: James 05/30/2021
I purchased a trailer harness set from George and although I had some issue with the install, one year later I'm more than pleased.
by: Ed09/09/2019
The wiring at rear hitch was easy and simple. Finding the connection behind the rear seat involved removing the entire seat bottom and back to make a simple connection of the converter. Once that was done the real problem came with trying to follow the fuse placements. After consulting the we then owners manual , was able to figure it out
by: Michael12/29/2022
The connection behind the rear seat was a little hard to get to but outside of that... .piece of cake, worked like a champ.
by: Gerry10/26/2018
seems to be a good product at a good price....however...your 'install video' says A) open the rear door B) locate the receptacle and plug in the device.....
There is a lot of unexplained hard work to get from A to B....like remove the entire back seat....etc.....at least 1/2 hour each way.......
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See what our Experts say about this Tekonsha Custom Fit Vehicle Wiring
- How to Reset my Honda Ridgeline After Installing the Tekonsha T-One Harness Part # 118778To reset the system after installing the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118778. Just return the ignition settings to the same as you would to park the Ridgeline. This will reset the electrical system and it will recognize the added wiring harness.
view full answer... - Where Is the Inside Connection for the T-One Vehicle Wiring Harness On a 2020 Honda RidgelineIn regards to the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118778 which is a fit for a 2020 Honda Ridgeline, there will be two connections one inside the vehicle and one outside. These locations will both be listed in the installation instructions. I have however attached for you below a snip of the instructions which points out the first connection.
view full answer...
- How to Install the Tekonsha Wiring Harness #118778 on my 2020 Honda RidgelineI've got some answers but unfortunately we have not had the opportunity to install the wiring harness here at etrailer yet. I have linked the instructions for you that will have some pictures for you as a guide. I will also try to explain what you are looking for. For the large black box you want to look behind the rear drivers side seat. This location will be all the way down where the floor and rear wall meet. For the plug on the rear of the vehicle you will be looking right under...
view full answer... - Recommended 4-Way Trailer Connector for a 2018 Honda Ridgeline I do have an option for you but the T-One Vehicle Wiring Harness part # 118384 is not a confirmed fit for your 2018 Honda Ridgeline. Instead, you will need to use the T-One Vehicle Wiring Harness part # 118778 which plugs into a pre wired connector under the rear bumper. There is also a converter box that gets installed inside the cab which you can see from the attached install instructions. Unfortunately, there is no adapter that will allow you to use the T-One Vehicle Wiring Harness...
view full answer... - Is The T-One Vehicle Wiring Harness # 118778 All That Is Needed For 4-Way Flat Trailer Connector? Yes, the T-One Vehicle Wiring Harness # 118778 will allow you to connect your 2019 Honda Ridgeline to a trailer with 4-way flat connector or Auxiliary Lights # C53201. It includes a powered module, wiring harness and fuses required to activate the factory wiring harness. You may want to use a Mounting Bracket # 18144 to secure the end of the connector and reduce the chances of it dragging on the ground.
view full answer... - What Does Trailer Wiring Connector Plug of 2019 Honda Ridgeline Factory Wiring Look LikeYou need to find the trailer wiring connector on 2019 Honda Ridgeline that is behind the rear bumper on the driver side attached to the crossmember. I attached a picture of what the connector looks like for you to check out to help install the # 118778.
view full answer...
- Recommended 4-Way or 7-Way Wiring Harness for a 2023 Honda Ridgeline We have a couple of options for wiring harnesses that are custom fit for the 2023 Honda Ridgeline. I have listed both options below: 4-Way - T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector item # 118778 7-Way - T-Connector Vehicle Wiring Harness with 7-Way Trailer Connector item # 118288 These custom-fit T-connectors plug into your Ridgeline's wiring harness, which is located towards the center of the back wall of the cab. The converter plugs into the gray 12-pin tow...
view full answer... - Installation of Wiring Harness on 2019 Honda RidgelineThis can be a bit tricky but it sounds like you might be looking in the wrong spot on your 2019 Honda Ridgeline to install the T-One Vehicle Wiring Harness # 118778. The directions don't do a great job of making this more transparent but the connector should be directly to the left of the connectors with the green relays which sounds like the one you have found. It may take some more digging to pull this connector out but you should be able to find and locate it on the side of the connector...
view full answer...
- Is Powered Converter Needed for Installing Trailer Wiring on a 2019 Honda RidgelineThe powered converter is what will send the actual power to the trailer connector so you will need to install it on your 2019 Honda Ridgeline whether you're installing the 4-Way flat or the 7-Way connector. I recommend going with the Tekonsha kits, 4-Way Part # 118778 or 7-Way Part # 118288, simply because we have found them to be the most reliable option. I'm attaching links to the installation instructions as well as our ball mount selection and a helpful article about choosing a ball...
view full answer... - Is Gray Tekonsha Connector for 2023 Honda Ridgeline Trailer Wiring Available SeparatelyThe T-One Vehicle Wiring Harness # 118778 only includes the gray connector in the full kit - unfortunately Tekonsha doesn't sell that plug separately. You might try checking with an auto parts store to see if they know where to acquire just the plug, but to my understanding these plugs are fairly unique and generally only come with the wiring harnesses themselves so I'm not sure how readily available that plug will be, and I unfortunately don't know the individual name of the plug.
view full answer... - Differences in Tekonsha #118778 & Curt #C56365 for 2019 Honda RidgelineCurt went a slightly different route when they designed their trailer wiring kit for your 2019 Honda Ridgeline than Tekonsha did when they created the # 118778. The fuse is there to protect the converter box in case of a short on the trailer wiring, which this doesn't surprise me as Curt's boxes have proven to us to be slightly more susceptible to a short causing them to fail than Tekonsha. The extra ground is harder to speculate but it seems they found too that it worked better with a...
view full answer... - How To Install a 4-Way Trailer Wiring Harness On a 2020 Honda RidgelineThe T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118778 is all that is needed to tow a trailer with 4-way using a 2020 Honda Ridgeline. It does indeed require a connection inside the vehicle. Please note, if the vehicle is pre-wired for a 7-way it will also be pre-wired for a 4-way.
view full answer... - No Trailer Running Lights On a 2019 Honda Ridgeline with T-One Vehicle Wiring Harness 118778I called Tekonsha and they said they have had one other customer with this issue while using the T-One Vehicle Wiring Harness part # 118778 on a 2019 Honda Ridgeline. The cause of this issue was a bad converter box so that may be what is causing your running lights not to work as well. I also took a look through the instructions and compared them to the Curt T-Connector Vehicle Wiring Harness part # C56365. It looks like each manufacturer recommends installing fuses in different places...
view full answer... - Installation Instructions for the Tekonsha Wiring Part # 118778I currently do not have any install videos of the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118778 on the Ridgeline even in different years. I have linked the instructions for you and overall it is not a very involved installation. The plug and play nature removes the need to cut, splice or modify your factory wiring.
view full answer... - Trouble Locating 12-Pin Connector for Black Box On a 2017 Honda RidgelineIt can indeed be difficult to locate the correct pigtail that is needed for the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118778 on your 2017 Honda Ridgeline but I assure you this is present. That said, others have had better luck finding the connector after removing the entire seat bottom which is more than required but will make things easier. If you still need help I have attached for you a write-up a fellow customer did that breaks down the process to find...
view full answer...
- How to Install Wiring Harness in 2019 Honda RidgelineThe installation of the T-One Vehicle Wiring Harness with 4-Flat Trailer Connector # 118778 on your 2019 Honda Ridgeline is a bit different because it uses a black box module, but it is still a straightforward install. What you will need to do is connect the black box module into the 12-pin tow plug that will be near the center of the back wall of your '19 Ridgeline's cab. Once you mount that, you'll need to look under the hood of your Ridgeline and find the fuse panel and insert the included...
view full answer...
- Trailer Wiring Harness Recommendation for 2019 Honda RidgelineFor your 2019 Honda Ridgeline the trailer wiring harness I recommend is the Tekonsha part # 118288 if you need a 7-way or part # 118778 for if you need a 4-way. These are the best wiring harness solutions as the Tekonsha brand is the most reliable option currently available due to their higher quality converter boxes. If your trailer has a 7-way and brakes you'll need a brake controller to activate them for that our best option is the P3 # 90195. This is a proportional brake controller...
view full answer... - Locating 12 Pin Plug to Install Trailer Harness in 2019 Honda RidgelineWhat we have found is that when installing a wiring harness such as the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118778 in a 2019 Honda Ridgeline, that 12-pin plug you are referring to can be frustratingly difficult to find and not exactly where the directions always say it is. We have had customers tell us that on some models of their Ridgeline they were required to actually remove the rear seat (instead of just fold it up) and remove the back trim (on the driver's...
view full answer...
- Recommended 4-Way Flat Wiring Harness for a 2019 Honda RidgelineIf you are looking for only a 4-Way Flat connector for your 2019 Honda Ridgeline then I recommend the Tekonsha T-One # 118778 because it has higher amp ratings than the Curt option and we have found the Tekonsha wiring units to be the most reliable out there. This connector gives you the basic lighting functions that you need for a smaller trailer and can be mounted using the Tow Ready # 18144 and a no-drill bracket like part # 18140. Since you have a pickup I do recommend installing...
view full answer... - Are Fuses Required for Installation of 4-Way in 2019 Honda RidgelineThe T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118778 that fits your 2019 Honda Ridgeline has fuses and they are required for this particular installation. Thankfully the linked instructions make it very clear where the three fuses (which are included) need to go during the installation of this harness. Under the hood of your Ridgeline find the fuse panel and insert the pair of 7.5 amp fuses in Position 6 and Position 7. Following that you will install the 20 amp...
view full answer...
- How to Remove Tow Plug Cap to Install 4-Way Harness on 2018 Honda Ridgeline SportThank you for the photo, it was helpful. From that it simply looks like you need to remove the locking tab of the tow plug on your 2018 Honda Ridgeline. The fastener at the top needs to be removed (what the arrow is pointing at) by sliding it rearwards. It has locking tabs as well so press down on those and that should remove the protective cap on the tow plug and you can complete your installation of the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118778. Once you...
view full answer...
- Where Does Trailer Wiring Install on 2019 Honda RidgelineI attached a picture that shows what both connectors on your 2019 Honda Ridgeline look like for installing the Tekonsha wiring kit part # 118778 that you referenced. The picture with the letter A on it is the 12 pin connector located near the back wall of the cab and the one with the letter D is the connector under the rear bumper by the driver's side.
view full answer...
- Help Finding Gray Connector on 2019 Honda Ridgeline to Install Trailer WiringThe Tekonsha pictures in the instructions for the # 118778 don't do a great job at explaining where to look but the Curt T-Connector # C56365 instructions have some great pictures for this. I have attached a clip from the instructions which shows that the location is a little further back behind another panel just to the left of the green relays (pictures J, K, L, and M). I have attached links to instructions for both the T-One and T-Connector so you can compare them with what you see...
view full answer...
- Parts Needed To Install The Redarc Tow-Pro Liberty And A 2022 Honda Ridgeline If you have the factory tow package on your 2022 Honda Ridgeline, then you will just need the Plug-and-Play Wiring Harness for Redarc Tow-Pro Trailer Brake Controllers # RED59FR for the Redarc Tow-Pro Liberty Brake Controller # RED24FR. In order to install the Redarc Tow-Pro Liberty Brake Controller, on your 2022 Honda Ridgeline, you will just need to plug one end into the main unit, and one end goes into the under-dash junction box. Then you will need to pick out a location where you...
view full answer...
Do you have a question about this Custom Fit Vehicle Wiring?
Info for this part was:
Expert Research:
Mike L
Expert Research:
Jameson C
Edited by:
Lindsey S
Installed by:
Cole B
Updated by:
Wilson B
Updated by:
Alexander C
Updated by:
Isabelle B
Written by:
Ronnie R
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Chuck C.
6/29/2021
Everything is still working fine