T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
(170 reviews)
Price: $50.27
In Stock
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
Item # 118451
Retail:$62.18
Our Price: $50.27
You Save: 19%
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- All Info
- Reviews (170)
- Q & A (0)
- Photos
Tekonsha Custom Fit Vehicle Wiring - 118451
- Custom Fit
- Trailer Hitch Wiring
- 4 Flat
- No 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.
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 - no cutting or splicing of wires
- Locate connection points behind tail lights
- Plug in T-connector
- Constructed of 16-gauge bonded wire
- Comes with dust cap for 4-way flat connector
Specs:
- Maximum amperage: 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 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.
118451 Tow Ready T-1 T-Connector - 4 Wire
Installation Details
California residents: click here
Customer Satisfaction Score:
97% were satisfied with this product
3% of customers were not satisfied
- Wrong item was ordered
- etrailer mistake
Customer Reviews
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118451
Average Customer Rating: 4.9 out of 5 stars (170 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.by: Matt 08/01/2023
The product was installed very easily and I have had no issues since installing it. Would purchase trailer supplies from here again.
by: John S.09/29/2017
As always---prompt and courteous service followed by products that fit well. I don't know if the wiring harness works with a trailer, but I am confident it will. The hitch fit perfectly. Fast delivery.
by: Joe N.07/25/2016
2010 GMC Acadia
I installed this on my 2010 Acadia. It fit perfectly and was easy to install.
The connectors are oem quality. The entire installation took about 1 hour.
Very satisfied.
Joe N.
7/25/2017
It still works just like it was brand new even after 1 year.No problems. Good product.
by: Kassi06/28/2020
Got my hitch very quickly even with the shipping delays going on with delivery services due to covid-19. As soon as the wiring kit was hooked up all the lights worked on the trailer without having to mess around with it. So far I am loving my purchase and wish I would have gotten one sooner.
According to my husband it was a very easy installation for both the wires and the hitch on my GMC Acadia.
by: Ian M06/23/2015
2011 GMC Acadia
The quick connects definitely helped reduce the time required to wire in the trailer light accessory. The quality of the product was top notch!
Ian M.
7/22/2016
I have only had to use it a couple of times but it works great and Im happy I made the investment. All parts are holding up well too!
by: Don M08/02/2014
2012 GMC Acadia
I ordered a hidden hitch, wire assembly and mount for the four pole flat wire block that mounts onto hitch. The order was shipped together and arrived ahead of schedule. The hitch and wire assembly installed in a little more than an hour. Everything looks professional and factory. No issues with lights blowing fuses or any other concerns that I read. I will be recommending eTrailer to anyone who asks about my install.
by: Lenny B08/31/2012
2011 GMC Acadia
Recently installed the Draw Tite hitch and the wiring harness on my 2011 Acadia. Both units installed without a problem, it couldn't have been simpler. the only coment I have is that the hitch bolts to the frame were 18mm not 3/4 inch. The bolts to the cross member were 3/4. As mentioned in another review the wire ties could be longer, 11 inch worked pretty good. One addtional comment to future customers is to make sure to watch the videos, they're great.
by: Terry J.05/04/2013
2012 GMC Acadia
Thank you so much. With the helpful videos and complete instructions the installation was a breeze. Both the hitch and light kit were a perfect match for my 2012 Arcadia. Sturgis here I come!
When I finished, my first thought was, "How easy was that!!"
I will have no problem recommending your site to anyone.
One note from my installation. The wiring and the plug ends fit through a space above the bumper support. With a little help from my pull wire, they ended up no where near the exhaust.
Thanks again,
Terry
by: Jody A03/21/2019
This is a high quality made wiring set. The price cannot be beat. Any local trailer store wants much more for a wire harness and it is not a complet ready to go set like this. It makes it so simple to plug into your existing tail lights and it is the perfect length to go from one side to the other and have a little bit extra for tucking and going around corners. I would highly recommed this.
by: Jordan Sweeney02/18/2014
The etrailer products were very easy to install, in a matter of 30 minutes I had the hitch and wiring completely in place. The directions that were provided were very clear and the quality of product is great. Etrailer was very friendly and reliable, they even upgraded my shipping at no cost! I will certainly use etrailer again and will recommend them to anyone!
by: Benjamin P07/13/2011
2009 GMC Acadia
I bought the T-One Vehicle Wring harness for my 2009 GMC Acadia. Installation was a breeze and the product works perfectly. After I received my harness I spent a few minutes reading the instructions and getting familiar with the parts. Within 20 minutes I had the harness completely installed and was ready to hook up my trailer and roll. I would highly recommend this to any one looking for an easy solution for adding a trailer lighting option to your vehicle!!
by: Regi H05/10/2011
2001 GMC Acadia
I used the trailer connector on my 2001 Acadia while pulling my motorcycle from NC to FL recently. The connector performed just as I thought it would even in the rain. I would suggest some type of case for the receptacle that attaches to the hitch. When the connector is not in use, the receptacle just hangs in the air (not pretty). Overall, installation was simple, trailer hook-up was easy, and I couldn't be happier.
by: Joe R.06/20/2014
Very easy harness. It only took 1 hour to put on the hitch with the harness. If i can do it anyone can. Its so easy because its dummy proof, you really cant put it on wrong and thats why i like this product. I recommend this along with one of etrailers hitches to make the whole job easier.
by: Johnrod1107/07/2018
2007 GMC Acadia
My Vehicle did not come with a tow package, i need lights to my trailer. My Acadia was wired but dead lights coming out of the connector.
The T-1 took care of all my problems my trailer is tow ready!
The T1 item #118451 is the best solution. I'm very happy with this product.
Thank you e.trailer!!!
by: Make H08/09/2015
2010 GMC Acadia
This product went on just like they said it would. It took me about 30 min but that was because I kept looking for a better way too run the wires. One thing that I really like about e-trailer is the videos. This wire harness was for multiple year GMC Acaida's so there were many different videos. I watched each Visio and learned little tricks that helped me install the harness with easy.
by: Mike M.09/30/2014
I had a great experience with my purchase. Etrailer.com shipped me my wiring harness very quickly and it was a breeze to install. I just watched their installation video and it told me exactly how to do it. Very pleased !!!
by: Dave Randall06/18/2012
2010 GMC Acadia
The product I order arrived quickly and was exactly what I ordered. It was high quality and fit my vehicle perfectly. The installation of both the hitch and wiring harness were quite easy with the assistance of the instructions provided.
by: Nate 07/21/2020
2012 GMC Acadia
I purchased this T harness for our GMC Acadia. Installation was easy, and the instructions were thorough. It was a little challenging getting the connectors fished through behind the body panels, but all in all it was an easy job. I definitely recommend this over the cheaper kits with crimp on wire splices.
by: Reed05/09/2018
2011 GMC Acadia
Hitch was great for my 2011 Acadia. Customer rep’s advice on electrical wiring package, etc. was invaluable. Hitch came in 2 days. I will definitely be ordering from them again.
by: Reed05/09/2018
2011 GMC Acadia
Hitch was great for my 2011 Acadia. Customer rep’s advice on electrical wiring package, etc. was invaluable. Hitch came in 2 days. I will definitely be ordering from them again.
by: Larry G.02/12/2015
SUPERB customer service!!!!!!
Everything arrived on time as promised. I took my time installing the hitch along with the electrical harness. I had both videos on standby. The videos explained everything in detail; although it didnt go 1,2,3 like the videos but it still went smoothly.
I would DEFINITELY purchase again in the future and recommend to everyone. I'm so glad I did this myself !! Saved myself about $300.
by: Bill F.08/19/2013
2011 GMC Acadia
It was easy enough to install. The installation videos are great on etrailer. I've installed two trailer hitches and wiring and all four videos have been excellent. The wiring itself is a pretty simple install.
by: Trevor T08/15/2016
This harness was easy to install. it took me maybe 30 minutes total time to install. I do wish it came with had a mounting bracket for the plug to mount to the vehicle though. it may be a separate item though.
by: Steve09/24/2017
The only trepidation I had about installing the light kit was getting the harness to feed to the light housing area. I used a pinch grabber and and easily brought the harness up to the light housing. Overall easy installation.
by: Brad S.01/16/2017
2012 GMC Acadia
I've purchased all of my hitch mounting equipment through etrailer and it's been perfect. The instructional videos that are tailored for a specific vehicle are easy to follow and make installation a breeze.
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See what our Experts say about this Tekonsha Custom Fit Vehicle Wiring
- Tail Lights on 2008 GMC Acadia Stop Working when Trailer is ConnectedLet's start with the easy stuff. Make sure the white ground wire on harness # 118451 is attached to a clean bare metal surface on your 2008 GMC Acadia. There can be no coating or paint and it works best if the wire is grounded by itself. If that doesn't help then what is probably going on is the trailer lights draw more power than the vehicle wiring system can handle. You can test this by removing the connections to some of the lights. Then, if everything else starts working, including...
view full answer... - Does T-One Harness Part # 118451 for 2008 GMC Acadia need Other Parts due to LED Tail LightsI spoke with one of our installers who has installed T-One harness part # 118451 on a 2008 GMC Acadia, and he said you should have no problems. If a T-One harness needs a converter, it will have one built in, but in this case it does not. We also have a video of this part being installed on a 2008 GMC Acadia and I will add a link to it below.
view full answer... - 2009 GMC Acadia LED Turn Signals Operate Erratically After Installing OEM Trailer WiringI have not heard of this issue before on an OEM part installed on a vehicle. Usually if this happens it is on the trailer and is usually a ground problem. I am not sure how the OEM harness installs but if it has its own ground wire then make sure it is attached to a clean bare metal surface. No paint or undercoating can be present. Also, it really should be grounded to its own location and not share a common ground with other electrical devices. It is possible that the trailer lights are...
view full answer... - Troubleshooting Passenger Side Trailer Lights Not Working Until Trailer Is Hitched To TruckBased on your description it sounds like if the trailer is not hitched to the truck but the wiring harness is plugged in the passenger side trailer tail lights do not work, but if the trailer is hitch to the truck that the lights starting working. If this is the case then there is a ground issue on either the truck or trailer. I recommend starting with the main trailer ground on the tongue of the trailer making sure it is securely connected to clean corrosion free metal. If those grounds...
view full answer... - Trailer Wiring Recommendation for a 2014 GMC AcadiaFor a trailer wiring kit confirmed to fit your 2014 GMC Acadia you would want the Tow Ready harness part # 118270. It will not require you to run a power wire up to the battery as it comes with fuses and relays to complete the circuits.
view full answer... - Troubleshooting Tekonsha T-One Trailer Harness Not Working on 2012 GMC Acadia The Tekonsha T-One Wiring Harness # 118451 that you ended up installing is the correct harness for your 2012 GMC Acadia and it will work whether or not you have the tow package so you made the right choice there. If you happen to have your trailer on hand, the first thing I recommend doing is simply hooking it up to the Acadia and plugging in your connectors. Sometimes those LED testers can be a little finicky so it's possible that the harness works perfectly and the tail lights on the...
view full answer... - Does a GMC Acadia Need an Upgraded Fuse Panel to Add Trailer WiringWhat I believe the dealer is suggesting is that if you wanted to add the tow package wiring, you would need that different fuse panel and some other components. This would then give you a 7-Way trailer connector at the back. If you do not want to add the towing package and just need a 4-Way, you can use the T-One Vehicle Wiring Harness, # 118451, without having to upgrade the fuse panel or anything else. This harness was made for those vehicles that do not have the tow package wiring....
view full answer... - Wiring for a 2009 GMC AcadiaThe correct T-One wiring harness for your vehicle is the 118451. Our site lists this harness as being okay for all models – it will work with all LED lights. Please note the tech tip: "Do not splice into the vehicle's wiring system to wire a trailer connector, use only the t-connector that plugs into existing connections." Despite what your dealer indicates, we sell many of the kits, which are then self-installed. I will attach an installation video for your reference below for this product....
view full answer... - Adding a 5-Way Flat Trailer Connector to a 2012 GMC AcadiaIn order to install a 5-Way flat trailer connector on your 2012 GMC Acadia you will need 2 items. First, since your model does not have the factory tow package, you will start by installing a 4-Way # 118451. With the 4-Way installed you will just need the second item which is a 4- to 5-Way adapter, # 20036. The adapter has an extra wire that will need to be spliced into a reverse light wire. You may be able to find a reverse light wire behind one of the tail lights by probing the wires...
view full answer... - How to Install a Trailer Wiring Harness on a 2011 GMC Acadia The plug you are referring to in the photo will not be used to install a trailer connector on your 2011 GMC Acadia. The correct way to install a trailer connector on your Acadia would depend on if you have the factory tow package or not. This is an important distinction to make and in order to be sure you know exactly what you have, you will need to obtain your VIN and contact the manufacturer directly. If you do not have the factory tow package then the connections you will need to make...
view full answer...
- What is the Correct Trailer Wiring Harness for the 2011 Kia SorentoA vehicle specific wiring harness is the best way to get the trailer lighting to work on your 2011 Kia Sorento. If your vehicle has the factory tow package wiring installed you will need the Tow Ready Custom Fit Vehicle Wiring, item # 118451, which will connect to existing connectors located along the frame on the passengers side near the rear tire. The instructions, see link, show pictures of the connectors you will need to use. If your vehicle does not have the factory tow package wiring...
view full answer... - Difference Between Curt Wiring Harness # C56056 and the Tow Ready T-One Wiring Harness # 118451There really is no difference between the Curt T-Connector Wiring Harness, # C56056, and the Tow Ready T-One Wiring Harness, # 118451. They both provide the same function but are manufactured by two different companies.
view full answer... - Troubleshooting Trailer Brake and Turn Signals Not Working with Tekonsha T-One Harness on Acadia The Tekonsha T-One Vehicle Wiring Harness # 118451 that you referenced plugs in-line with the tail light circuits on your GMC Acadia via factory ports behind the tail lights themselves. The harness and the power it receives from your vehicle should be completely separate from any tow package, as it simply gets power from the factory light circuits. There aren't any fuses related to this harness or its ability to send power back to the trailer lights unless the lights on your Acadia aren't...
view full answer... - Troubleshooting Left Stop/Turn Signals on Trailer Towed by 2007 GMC AcadiaYou have already started the troubleshooting process to find the cause for your trailer's left-side turn and brake lights not working. Since another vehicle has no issue with this trailer this does tend to suggest that the issue is on the Acadia. Since both 4-pole and 7-way trailer wiring setups combined the left stop and turn signals onto one wire, typically a yellow one, what I suggest is that you start a close inspection of this circuit/wire at the trailer connector itself. You can...
view full answer... - Trailer Running Lights Will Not Work with 2009 GMC Acadia XLT with Tow PackageFirst you are going to want to make sure that the running light circuit is working on the trailer connector on the 2009 GMC Acadia. Use a circuit tester such as # PTW2993 to test the running light circuit. If it is not working, then check the vehicle owner's manual for the fuse location for the tow package running lights to check/change it. Also check the owner's manual for any relays that might be needed for the tow package wiring. I do not recommend tapping into the running light wire...
view full answer... - Troubleshooting No Trailer Turn/Brake Signals with 2007 GMC AcadiaI do agree that the wiring issue you are experiencing is somewhere on your Acadia. You mentioned that the Acadia didn't come with the tow package but it does have the trailer wiring and hitch. This means you likely have a T-Connector wiring harness installed such as the Tekonsha # 118451 that plugs into factory ports behind the tail lights. What I recommend doing is checking the white ground wire coming from the harness. Make sure this is still securely attached to a clean, bare metal...
view full answer... - Would a Trailer Hitch from a 2012 GMC Acadia Fit a 2016 AcadiaYes, a hitch like the Draw Tite part # 75528 would fit both a 2012 and a 2016 GMC Acadia. I attached an install video for this hitch for you to check out as well. If you wanted to do some towing you might be interested in etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with a 3/4 inch rise or 2 inch drop and one with a 2-3/4 inch rise or 4 inch drop. It also includes a 1-7/8 inch ball, 2 inch ball, hitch pin with clip, and a storage bag. If the ball mount kit does not...
view full answer... - No Running Lights With T-One 4-Pole Harness # 118451 on 2009 Acadia XLT with Tow PackageThe wiring harness you referenced, T-One 4-Pole Harness # 118451 from TowReady, uses plug-and-play connections to your Acadia taillight assemblies to generate lighting signals for your trailer. This harness provides trailer lighting signals on its included 4-pole connector that are completely independent of any factory tow package wiring that may be in place. Please take a look at the linked video which shows installation of this harness in your same year/make/model vehicle. The written...
view full answer...
- Troubleshooting Wiring on Trailer Towed by 2009 GMC Acadia With Tow PackageSince you did not find any blown fuses, my suspicion is that the problem lies somewhere in the wiring of the trailer, so let's begin by isolating the problem to confirm that the problem lies in the trailer wiring. Use a circuit tester like part # PTW2993 on the trailer connector as each lighting function is activated. Activate the right turn signal, then test the pins on the connector. Do the same for the left turn, brake and running lamp. If the trailer connector checks out okay, then...
view full answer... - Troubleshooting No Power On T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118451I would start checking fuses and relays on the power block in the engine bay. The cover should have a map or listing of all the fuses. Check all of the fuses that have anything to do with taillights or tow circuits. I have added a link to a wiring FAQ page that shows which pins should serve which function. Use the circuit tester like # PTW2993 to make sure everything is on the correct pins.
view full answer... - Trailer Lights Malfunction on a Small Utility Trailer Behind a 2009 GMC Acadia with Factory 7-WayVehicles with LEDs will have problems with standard trailers unless a powered tail light harness is used, or there is a factory tow package. If your 7-Way on your Acadia is indeed a factory connector, you should have no problems with LEDs vs. incandescent lights. Most small utility trailers do not have a 7-Way. 7-Ways are used on larger trailers that have electric brakes, or hydraulic systems powered by a battery, or boat trailers with hydraulic actuators with reverse lockouts. If your...
view full answer... - Can Bumper Cover be Put Back On 2010 GMC Acadia After Installing Trailer Hitch e98863It is highly likely the bumper cover will be able to be put back on your 2010 GMC Acadia after installing the etrailer.com Trailer Hitch Receiver # e98863, though there are some occasions which it has not been able to. That said, it is rare the cover will not go back on, as I went through all of the customer reviews for this hitch and the Curt Trailer Hitch # 13424, and there was just one instance of a customer relaying they were unable to get the cover back on. All other mentions of...
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- Draw-Tite Trailer Hitch Receiver with Installation Hardware for a 2008 GMC Acadia The 2008 GMC Acadia Draw-Tite Max-Frame Trailer Hitch Receiver Class III - 2" # 75528 is a quality choice for your vehicle, and it comes with all the hardware you'll need for installation. If you plan on towing, you'll want to grab a wiring harness and ball mount set-up as well. Wiring harness for a vehicle without a tow package # 118451 Wiring harness with tow package # 118384 I recommend the etrailer Ball Mount Kit # 989900. It comes with 2 ball mounts, 2 balls, a hitch pin with clip,...
view full answer... - Trailer Hitch and Wiring Recommendation for 2012 GMC AcadiaThe trailer hitch I recommend for your 2012 GMC Acadia is the Draw-Tite Class III Max Frame Round Tube Receiver # 75528 because it offers a greater towing capacity at an economical price for you. This hitch will also offer a more streamline look for your Acadia when it is exposed than the square and boxier framed Curt hitch. We have found that the original fascia cover on the 2012 models of the Acadia is not able to be reinstalled after an aftermarket hitch is installed. Other customers...
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Do you have a question about this Custom Fit Vehicle Wiring?
Info for this part was:
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Mike L
Expert Research:
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Expert Research:
Michael H
Expert Research:
Jameson C
Expert Research:
John H
Expert Research:
Adam R
Video Edited:
Zack K
Video Edited:
Joshua S
Video Edited:
Chris R
Updated by:
Laura H
Updated by:
Wilson B
Updated by:
Alexander C
Updated by:
Isabelle B
Installed by:
Cole B
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John S.
9/29/2018
All is well with my harness and hitch after one year. No issues whatsoever.