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T-One Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector

T-One Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector

Item # 118278
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Custom Fit Vehicle Wiring

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Custom Fit Vehicle Wiring 118278 - Custom Fit - Tekonsha
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Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into OEM tow package harness - no cutting, splicing or tapping required. Call 800-298-8924 to order Tekonsha custom fit vehicle wiring part number 118278 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 for Factory Tow Package - 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (29)
  • Q & A (20)
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Tekonsha Custom Fit Vehicle Wiring - 118278

  • Custom Fit
  • Tekonsha
  • Trailer Hitch Wiring
  • 4 Flat
  • 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 OEM tow package harness - 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
    • Designed for use with a factory tow package
    • 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 in rear cargo area
    • 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
  • 1-Year limited warranty


Installation

This custom-fit T-One connector plugs into your vehicle's factory tow package wiring harness, which is located in your rear cargo area. You will have to remove the rear threshold plate and interior paneling to access this harness.


Once installation is complete, the 4-way 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.


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.



118278 Tekonsha T-1 T-Connector - OE Replacement - 4-Way

Installation Details 118278 Installation instructions

This Product Fits The Following Vehicles



California residents: click here


Video of T-One Vehicle Wiring Harness for Factory Tow Package - 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 Trailer Wiring Harness Installation - 2016 Mazda CX-9

Today on our 2016 Mazda CX 9, we'll be installing Tekonsha T1 vehicle wiring harness for the factory tow package. This will will give us a 4-pole flat trailer connector. Part number 118278. When we've arrived at our and we've unhooked from our trailer, we can replace the dust cap on our wiring, open our hatch on up, open this compartment on up, and store our wiring inside of it. It's tucked up out of the way, we don't have to worry about any of our cargo damaging it, and it's there for when we need it. Whenever we want to use our wiring, we just got to lift up on this cover, lift it out, set it to the side of our trunk latch, put it down by our hitch, and then close our trunk on up. All right, here's what our wiring harness comes with. We have our wiring harness here with a plug that goes to the factory tow package wiring in our rear hatch.

There's a ground wire we'll have to attach to the vehicle's chassis with the included self-tapping screw. The wiring then goes to this module like converter here which will isolate our trailer wiring from the vehicle wiring so we don't worry about any voltage being back-fed into the vehicle if there's a short in our trailer. We have a length of wire here. If I got to our trailer connector, it's a 4-pole flat to give us all the lighting functions required by law. Has a built-in dust cover here to help protect our connector.

We have some double-sided tape to attach our module to the side of the vehicle, and then several zip-ties here in order to secure our wiring out throughout the vehicle. Now that we've gone over what's included, we'll show you how to install it. Start by opening our rear hatch. Remove our floor covering here. We just slide it forward over our third row seat if it's folded down just to get it out of the way. Take out these side panels.

Take out this carpet here that goes over our spare tire. Take out these plastic trays. Slide them up and out of the way. Pull up on them to release the passenger side. Take our jack out.

Take out this panel here. Just pull up on it, pull it out. Pull up on our threshold cover here to release it. Set it aside and out of the way. Take off this plastic pushpin here. Use a flat head screwdriver to get it out. Pull up on it. Center pulls up, you can pull the whole thing out. Fold our cargo loop on down on the passenger side here. I pull down on this cover here. We'll access this 10 millimeter bolt. Remove this bolt. I'll remove the cargo hook. Make sure we push this back together first. It's back together. Put the bolt in it and I'll set it aside. I'll do the same for this one right here. It's slightly different. Pull up on the lever and you find the 10 millimeter bolt right there. Pull that out and set it aside. Now we'll pull back our passenger side panel. Use a trim panel tool and come behind. This will help get a grip in it. Do the same for our carpet. Now just pull this forward a little bit. Now our unused connectors are right behind this panel and that's where we'll plug our harness on into. Once you hear a click, pull back on it, make sure it's secure. Now we need to attach our ground wire. We can use the provided self-tapping screw and secure it to the chassis on this area. Right here, there's a 10 millimeter bolt that's being used as a ground location. To remove that bolt, we can place this underneath the bolt and secure the bolt. We don't have to drill any holes into our vehicle. That bolt removed. Stick the wiring harness on there and resecure it. Okay. Now I pulled off the back on one side of our double-sided tape. Apply it to the back of our module box. Press it down and make sure it's secure. Peel off the other end and I'll apply this to the flat surface inside our vehicle. Now push down on it, make sure it's secure. Now we'll take our wire, and run it underneath this panel here. Just set it inside that spare tire wall, and we'll push our panel back into position. Make sure your weather stripping sits on top of it all the way. Your pushpin, reinstall it. You reinstall our cargo net tie-down points here too. We'll reinstall this piece here. Make sure it lines up with the holes. Push it back on down just like that. Reinstall our jack. Okay, we'll reinstall our sill plate at this point. Just line it up in its holes, push down until it snaps down into place. Make sure that weather stripping is sitting on top of it all the way. We'll reinstall our side panels now. Just kind of drop down into place like that. Driver side one, you got to physically push in like that. Pull our wiring out and set it to the side here. We'll reinstall our spare tire cover just like that. The wiring, we can rest inside this compartment right here. We'll resinstall our side panels just like that. We'll resinstall our cover for our compartment just like that. That completes our installation. If we ever want to use our wiring, we just got to lift up on this cover, lift it out, set it to the side of our trunk latch, put it down by our hitch, and then close our trunk on up. Now before we hook up to our trailer, it's always a good idea to test our wiring and make sure it works. We'll take our dust cap off here. We'll be using a 4-pole flat trailer tester. It's part number I26. We have these available on our website if you want to purchase one. Just push it on in there and we'll test our function inside the vehicle. All right, so with our headlights on, you can see that the red LED that corresponds to the brown wire is working, we'll do our left turn signal now. I'll do the right. I'll step on the brakes, and you can see the LEDs for both the yellow and green wires are now illuminated solid. Now that we verified that everything's working, we can go ahead and hook up to our trailer and get on the road. That completes our installation of Tekonsha T1 vehicle wiring harness for a factory tow package with 4-pole flat trailer connector, part number 118278 on our 2016 Mazda CX 9.


Customer Reviews

T-One Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector - 118278

Average Customer Rating:  4.9 out of 5 stars   (29 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 OEM tow package harness - no cutting, splicing or tapping required.

- 118278
by:
2018 Mazda CX-9

Straightforward installation with the etrailer video. Nice quality harness. Plug and play simplicity. 614649



- 118278
by:
2017 Mazda CX-9

This was very easy to install and the online videos mad it very simple. 368815



- 118278
by:
2016 Mazda CX-9

Nice product and easy to install the "Draw-tite Max-frame Trailer Hitch Receiver" with T-One wiring harness for Factory Tow Package- 4 Pole Flat Trailer Connector... 381268



- 118278
by:
2016 Mazda CX-9

The hitch receiver is easier to install than the wiring harness, but that is only because I hate taking apart all the snap fasteners on interior panels. But, once removed, this simply plugs in and you are good to go. Like in the video, I secured the ground on the 10mm bolt. One tip is to pull out the trays straight up and with some good force to pull out the white retaining pins. Otherwise, you will have to pry them out using a forked interior panel pry bar, like the one in the video. Overall, this is a great product. 439097


Comments
Awesome thank you!
R. H - 10/04/2018

44318

- 118278
by:
2016 Mazda CX-9

If you have a 2016 MAZDA CX-9 - this kit WORKS. It appears all 2016 Mazda CX-9's have the trailer wiring harness already installed. It is located behind the rear passenger side interior panel - the Tekonsha instructions show you how to get to it. You do NOT need to get a "generic" wiring kit as many of the other responses are suggesting. Just plug this one in and it works. I have submitted pictures below of the installation on my vehicle. I also installed the 76020 Draw-Tite Class 3 Trailer Hitch Receiver which fit nicely. 292773



- 118278
by:
2019 Mazda CX-9

Hitch and light harness installed today. Every part fit perfectly as recommend on the website. Quality of the product is excellent. I had to message the company to verify the products needed, they responded timely and accurately with the part numbers etc. Product received on time undamaged and packed very well. I had a very good overall experience with this firm and highly recommend them. Ron 738955



- 118278
by:

After watching installation video I installed wiring myself it took 35 minutes, It works great and I've learned a little bit more about my car, I love it when things come together easily. 728748



- 118278
by:

Easy to install. Great Product. 722500



- 118278
by:
2019 Mazda CX-9

Wiring harness plugs right into factory plugs. The BEST part, the etrailer howto video was perfect. It matched my year and model exactly and give me a very clear, detailed step by step on the installation, showing how to remove and replace all the panels and bits without damage. 720084



- 118278
by:

The hitch arrived quickly, I installed the wiring myself, this was very easy after watching your video. I had a local company install it, as I don't have a pit or hoist and I am way too fat to squeeze under this vehicle. the installation took 35 minutes. I am extremely happy with the product and the service. 719283



- 118278
by:
Mazda

Installed on a 2018 Mazda CX9. This worked perfectly and the installation video was great! You know a review is good when theirs not much to talk about! 662629



- 118278
by:
Mazda

Perfect fit and professional installation. I am very happy with my hitch on my 2018 Mazda CX 9 Grand Touring. 649829



- 118278
by:

Watching the installation video prior to installing made the world of difference! I was able to install this within 20 minutes and was very easy. If I was to do this by the directions alone it would have taken 3x as long and would have been challenging!! Way to go etrailer, you guys are the best!! I purchased the bracket to install this outside the car but now contemplating whether to just keep it inside until I need to tow. 646486



- 118278
by:

I am not a car mechanic, but had no problem to wire my car and install the 4 pin flat connector even though it meant that I had to gut the car. The instruction video was very detailed and easy to follow 628614



- 118278
by:

Great buy 600243



- 118278
by:

Easy to install and the length of cables was wonderful. 600181



- 118278
by:
2017 Mazda CX-9

I had ordered the recommended hitch and wiring install kit through the trailer rental place and found not only were there no instructional videos but the wiring kit they recommended for my vehicle make and model was incorrect. etrailer had the right wiring kit (at a lower price) and the most helpful instructional videos! Will recommend them every time in the future. 584345



- 118278
by:

Easily done. Very simple instructions. Thank you, Tim 576415



- 118278
by:
2016 Mazda CX-9

Product as described, easy to install and works as intended. 508836



- 118278
by:
2018 Mazda CX-9

Excellent video that was spot on to install the wiring harness in my 2018 Mazda CX9 - good quality and fast shipping 503790



- 118278
by:
2017 Mazda CX-9

I got the Tekonsha wiring harness for my 2017 Mazda CX-9. It fit and works perfectly. I bought it from etrailer because of the videos that showed how to get to the plug, which is in a difficult spot behind a rear trim panel. I would never have figured it out on my own, so thanks, etrailer! Installation wasn't really difficult, although it might help to be a contortionist (thanks, Mazda), but I installed it and buttoned everything up in about 20 minutes. The price is right, shipping was FAST, and the installation videos are a huge help. Five stars! 489655



- 118278
by:

The product i bought have been so useful to my family. I Highly recommend it. And it's very durable. 453082



- 118278
by:
2016 Mazda CX-9

Excellent product, great quality and very easy to install. The only place I could find this à year ago was at etrailer and I have only great things to say about etrailer. I highly recommand this product! 435397



- 118278
by:
2016 Mazda CX-9

Product arrived on time and in excellent condition. Very clear directions and video. Easy to install. 429938



- 118278
by:
2016 Mazda CX-9

The ordering process was very simple and quick to get out the door. Box arrived in terrible shape very bent but the hitch was fine. The installation process was not as simple, had to remove the muffler took about 45min more. The wiring was simple. All in all it was a fine experience. 402568


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Show More Reviews

Ask the Experts about this Tekonsha Custom Fit Vehicle Wiring

  • Best Trailer Wiring Harness for a 2014 Mazda CX-9 with Factory Tow Package
    I do have an option for you but the T-One Vehicle Wiring Harness for Factory Tow Package part # 118278 is not a confirmed fit for your 2014 Mazda CX-9. Instead, you will want to use the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118520 which fits models both with and without the factory tow package. The wiring harness that you originally asked about is only a confirmed fit for a Mazda CX-9 from 2016-2018 and will not work on your 2014. I have also attached...
    view full answer...
  • Recommendation for Adding 5-Way Trailer Connector to 2019 Mazda CX-9
    On your 2019 Mazda CX-9 there is a factory port behind the passenger side trim panel that accepts a custom 4-Way trailer harness plug. If this is what you are referring to when you mentioned that your vehicle has the trailer ready connector, then you will want to start with the Tekonsha T-One Wiring Harness # 118278. This will plug right into that factory port to provide you with a 4-Way connector. From there (or if you already have the 4-Way connector) I recommend simply adding the...
    view full answer...
  • Hitch & Wiring Harness for 2018 Mazda CX-9
    We can help you with a trailer hitch and wiring harness for your 2018 Mazda CX-9. We'll start with hitches. Although we offer both 1-1/4-inch Class II and 2-inch Class III hitches I urge you to select a 2-inch model from Draw-Tite, part # 76020. This particular 2-inch hitch offers a high tongue weight rating of 675-lbs, it installs without any drilling using the included hardware kit, and it includes a mounting bracket for trailer wiring. If you will tow often you can use the wiring...
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  • Trailer Wiring Recommendation that Fits 2018 Mazda CX-9
    Actually the trailer wiring harness part # 118278 is a confirmed fit for the 2018 Mazda CX-9. I attached an install video for you to check out as well.
    view full answer...
  • Will T-One Connector Fit 2018 Mazda CX-9 With or Without OEM Hitch
    According to my research, and my contact at Tekonsha, the 2016 and 2017 CX-9 models both came with the connector for the T-One # 118278 as a standard. Since your 2018 Mazda CX-9 is the same generation it would be surprising if you didn't have that connector. I did check the online version of your owner's manual and it states on page 6-58 that the #8 "Trailer Hitch" fuse is only included on some models. You may want to check the left side of your fuse block compartment to make sure that...
    view full answer...
  • Can the Tekonsha Wiring Harness # 118278 Fit a 2016 Mazda CX-9
    The Tekonsha Wiring Harness # 118278 is only confirmed to fit 2016 Mazda CX-9's with a factory tow package. If you do not know if you have a factory tow package, you can check behind your rear trim panels to see if you find the factory connectors. If you find factory connectors, you can use a circuit tester like part # 40376 to probe the connectors to see if they are active with taillight functions. If not, you will have to check with your dealer to see if the factory connectors can be...
    view full answer...
  • 4-Way to 5-Way Adapter Recommendation for 2016 Mazda CX-9
    The back up circuit will be found at the reverse light harness of the vehicle. You will need to find the circuit that carries 12 volts only when the vehicle is in reverse that runs to the reverse light circuits of your 2016 Mazda CX-9. For an adapter to convert the 4-way to a 5-way you will want the part # 20036. To find the circuit you will need a tester like the part # PTW2993.
    view full answer...
  • Installing 5-Way Connector on 2016 Mazda CX-9
    There is not a 5-Way connector available that is designed to install on your 2016 Mazda CX-9. With this in mind, the best solution is still to install a 4-Way connector with the Tekonsha # 118278 and use the Wiring Adapter # 20036, which is what it sounds like you are doing. The harness and adapter will give you the 5-Way needed to connect to your trailer.
    view full answer...
  • Parts Needed to Tow Small Utility Trailer with 2017 Mazda CX-9 Equipped with 1-1/4" Hitch
    In order to pull a 4x6 utility trailer with your 2017 Mazda CX-9 you will need to add a wiring harness and ball mount/hitch ball combo. Starting with the wiring harness I highly recommend the Tekonsha T-One # 118278. This custom harness simply plugs into a factory port behind the passenger side trim panel for a complete "plug-and-play" install. This will provide you with a 4-Way connector to connect with and power the trailer's basic signal lights. I have attached an install video...
    view full answer...
  • Least Obvious Trailer Hitch Receiver and 7-Way Trailer Connector on 2016 and 2017 Mazda CX-9
    The 2016 and 2017 Mazda CX-9 models both use the same trailer hitch receivers and wiring harnesses. Both the Draw-Tite # 76020 and the Curt # C13284 Class III trailer hitch receivers are pretty hidden. But the Draw-Tite seems a little less obvious because there's a little less of the hitch hanging below the bumper. I've linked install videos of both of them for you. There isn't a 7-way trailer connector that plugs into the CX-9's wiring. However, we do have the parts for you to...
    view full answer...
  • Parts Needed to Tow with a 2018 Mazda CX-9
    The trailer hitch that I recommend for your 2018 Mazda CX-9 is the Draw-Tite Max-Frame Trailer Hitch Receiver # 76020. This is a Class III hitch with a 2" receiver that has a max gross trailer weight of 4,500 lbs and a max tongue weight of 675 lbs. I looked at the online version of your owner's manual and it looks like your CX-9 has a trailer weight limit of 3,500 lbs. I recommend checking out your owner's manual for towing specifications as well. When it comes to the wiring you will...
    view full answer...
  • Parts Needed to Tow U-Haul Trailer with 2018 Mazda CX-9
    In order to tow a 5x8 U-Haul cargo trailer with your 2018 Mazda CX-9 you will need a trailer hitch, a 4-Way wiring harness, and a ball mount/hitch ball combo. There are two Class III 2 inch trailer hitch receivers available for your CX-9, the Curt # C13284 and the Draw-Tite # 76020. Both feature pretty similar designs and will use the same existing holes in the vehicle's frame but I recommend going with the Curt # C13284 because it offers a slightly more recessed (hidden) receiver and...
    view full answer...
  • How to Remove Lower Trim Panel for Trailer Hitch Receiver Installation on 2019 Mazda CX-9
    You are right that there is a small trim panel underneath your 2019 Mazda CX-9 that does need to be removed when installing either the Draw-Tite Trailer Hitch Receiver # 76020 or Curt Trailer Hitch Receiver # C13284. Doing this is not difficult at all and only requires a flat head screwdriver and 10mm socket. All that is required is popping off the two plastic fasteners using the flat head screwdriver and then using the 10mm socket to twist off a couple of hex nuts; the trim panel does...
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  • Determining Towing Capacity of 2017 Mazda CX-9 with Draw-Tite Class III Trailer Hitch
    The Draw-Tite Class III Max Frame Receiver Hitch # 76020 referenced in your question is confirmed to fit your 2017 Mazda CX-9. As you mentioned, the 2 inch hitch features a 4,500 pound towing weight capacity and a 675 pound tongue weight capacity. I took a look at the online owner's manual for your CX-9 and found a towing capacity of 3,500 pounds. A towing setup is always going to be limited by its weakest component. This simply means that the weight of your trailer will need to fall...
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  • Recommendation Trailer Hitch, Wiring, and Towing Setup for 2016 Mazda CX-9
    Good news, I can help you outfit your 2016 Mazda CX-9 with a trailer hitch and wiring towing setup. First I recommend the Draw-Tite Class III Trailer Hitch # 76020 for its no drill installation, the higher capacity rating, and lower cost. I reviewed the question you looked at and found that if your vehicle came with the tow package you will be able to use the # 118278 and you will find the plug-in location behind the passenger side trim panel. I have linked an image to help you find...
    view full answer...
  • Recommended Trailer Hitch and Towing Capacity for 2018 Mazda CX-9
    We have everything you need to be able to safely tow a trailer with your 2018 Mazda CX-9. To do this you will need a trailer hitch, a wiring harness, and a ball mount/hitch ball combo. I did take a look at the online version of the owner's manual and found that the 2018 Mazda CX-9 has a towing weight capacity of 3,500 pounds. Starting with the trailer hitch I recommend the Draw-Tite Class III Max Frame # 76020. Its higher capacities and integrated wiring harness bracket on the crosstube...
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  • Recommendation to Install 5 Pole Connector on 2017 Mazda CX-9
    If your 2017 Mazda CX-9 already has a 4-Way connector installed, I recommend using the Tow Ready 4 Pole to 5 Pole Trailer Wiring Adapter # 20036. This will easily change the 4 pole flat on the vehicle to a 5 pole flat. The additional blue wire will simply get spliced into the reverse light wire on the CX-9 with the included quick splice connector. You can use a circuit tester like # 3808 to determine which wire is the reverse wire on your vehicle. If you do not have a 4-Way already installed...
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  • Hidden Trailer Hitch Recommendation for 2019 Mazda CX-9
    The most hidden and best hitch option for your 2019 Mazda CX-9 is the Draw Tite hitch part # 76020 as only the hitch opening hangs below the rear bumper and it has a 7-way bracket built into it which will make mounting a 7-way like you are wanting as easy as possible. I attached an install video and picture for this for you to check out as well. For trailer wiring you'd need to start with a 4-way like the part # 118278 which installs easily and then you'll need to convert it to a...
    view full answer...
  • Best Trailer Hitch and Wiring Harness Option for a 2016 Mazda CX-9
    For your 2016 Mazda CX-9 I recommend installing the Tekonsha Vehicle Wiring Harness Kit with 4 Pole Trailer Connector # 119147KIT. Tekonsha is a popular and reliable brand. Since you don't have a trailer hitch receiver you most likely do not have a tow package. However, vehicles with a factory tow package would use the T-One Vehicle Wiring Harness 4-Pole Flat Trailer Connector # 118278. For a quality and cost effective trailer hitch receiver I would go with the Draw-Tite - Class...
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  • Can the Prodigy RF Wireless Brake Controller Work with a 2017 Mazda CX-9
    Our fit guide only resorts to showing the Prodigy RF Wireless Brake Controller, part # 90250, if there aren't really any other options for your particular vehicle. There are lots of brake controller options for your 2017 Mazda CX-9 so it doesn't show up. However, it will work for you because it works on any vehicle that has a 7-way trailer connector with an active 12 volt pin. If you don't have a 7-way connector already then you need to add one to use the Prodigy RF. The easiest way...
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Info for this part was:

Video by:
Andrew K
Video by:
Kathleen M
Video by:
Jonathan Y
Edited by:
Lindsey S
Expert Research:
Jameson C
Expert Research:
Sarah H
Video Edited:
Jacob T
Video Edited:
Chris R
Installed by:
Cole B
Written by:
Alexander C
Test Fit:
Brent H
Test Fit:
Robert C
Updated by:
Isabelle B

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