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  1. Custom Fit Vehicle Wiring
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  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 4 Flat
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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 # 118359
Our Price: $26.09
You Save: 35%
Custom Fit Vehicle Wiring

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118359 - No Converter Tekonsha Custom Fit Vehicle Wiring
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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 existing wiring - no cutting, splicing or tapping required. 1-636-306-4830 to order Tekonsha custom fit vehicle wiring part number 118359 or order online at Free expert support on all Tekonsha products. Great prices and Fastest Shipping for T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (166)
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  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118359

  • 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.


  • 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 along the frame rail
    • Plug in T-connector
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


  • Maximum amperage: 7.5 amps per circuit
  • 1-Year limited warranty


This custom-fit T-One connector plugs into your vehicle's wiring harness, which is located at the rear, along the inside of the driver's side frame rail.

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.

118359 Tow Ready T-1 T-Connector - 4 Wire

Installation Details 118359 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Satisfaction Score:

Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118359

Average Customer Rating:  4.9 out of 5 stars   (166 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.

2001 Chevrolet S-10 Pickup

Happy with the order and service. One of the trailer hitch arms was bent almost 30 degrees due to lack of secure packaging and rough handling by UPS. etrailer sent me a replacement quickly after they saw the photo. Only comment was I got multiple emails from different associates at etrailer, so it was a little confusing about what they were going to do. It all worked out well, and I would order from them again.


Great delivery time and easy installation instructions.

2000 Chevrolet S-10 Pickup

The item was exactly what I needed, it worked as described and was very easy to mount and hook up. No issues what so ever. I would order again and recommend to anyone who is looking at this item. Before i ordered this item I had no way of plugging into a trailer for break lights, turning singles and running lights. My vehicle is 2000 chevy s10 using the factory bumper with a ball hitch added it all just worked great together like if it was straight from the assembly line. A simple plug and go no needing to splice any wires together. Thanks etrailer for a great product.


This is as painless as it gets. Separate a connector for the taillights underneath the back of the truck. Plug this adapter in line. Tie strap the harness to the hitch. Done.

No cutting or splicing any wires. Worth every penny at twice the price.


I ordered the wire harness and wire harness mount clip. The mount clip came without the mounting hardware, not a big deal.
I called up e trailer and spoke to Nick, he refunded me for the mount clip. I got the mounting hardware at home depot. I mounted it no problem and hooked up the wiring very easily. The products are great, the people are helpful, its a good company to do business with and I eill do business with them again in the future. Their how to videos simplify everything. Great company to do business with, thank you.

2002 GMC Sonoma

Trailer plug was mailed and received promptly, easy installations to my 2002 GMC Sonoma and finally lights function on my trailer. Thank you so much for your quality products and look forward to purchasing many more items from you all.


Works as advertised. Very simple plug and use harness. As always, Etrailer rocks!!!


Works as expected, !


easy plug-and-play fit. used to connect opt7 led turn signal/brake light bar.
super convenient and zero issues at all with this wire harness!


S-10 trailer hitch. Had to remove the steel truck bumper, take off the arms that mount the bumper to the frame and mount the hitch arms between the bumper mounts and the truck frame itself. Afterward, we reinstaller the bumper.
The purchase has been a good one. Likely to leave it on the truck as long as it runs, which thankfully in 2021, this 2001 S-10 runs well.


Fit and worked as intended


Great product, perfect fit, and an amazing staff that answered all my questions promptly and got me the exact hitch I needed! Thanks etrailer one happy customer here


Dull & boring - it just works as repres ented.

1998 Chevrolet S-10 Pickup

Very satisfied with product. Easy hookup. Fast delivery

2003 Chevrolet S-10 Pickup

Loved the idea from the start and installing was a lark. Everything continues to work perfectly. I cut one of the trailer wires jack knifing my trailer while trying to backup ha ha. After disconnecting the yrailer plug everything continues to work perfectly. Thanking you profusely.

Great. No trouble because it works so well.
Daniehl - 06/05/2018


Super easy to install,talk about the right part for the job...

1999 Chevrolet S-10 Pickup

I'm 78-yeard-old and I installed this on my 1999 Chevy S-10. After watching the video on YouTube a couple of times it took me just a little over a half-hour. When I finished installing it, I hooked up my trailer, and everything worked right from the get-go.If you make sure you order the kit that is right for your car, the only way installation could be any easier would be if it had already been installed when you bought the car.

Still working like a charm.
Gene D - 05/15/2018

Pontiac Trans Sport Van

The reason I bought this harness was because I bought a hitch assembly at the same time and needed the harness also. I am with the Disabled American Veterans and the reason for these purchases was we had a widow of a veteran who needed a way to transport her scooter. Well we installed the hitch and harness on her car along with a hitch mounted carrier for her scooter. She was now able to be more mobile than she was before. She could not walk well so this enabled her to go where she couldn't before. This was all donated to her at no cost to her.. She felt so blessed this happened. Yes your product worked well and it made a difference in someone's life.. Thank you...

2001 Chevrolet S-10 Pickup

Wiring harness was used to wire a trailer connection on a Chevy S10 pickup. Installation was relatively easy if you like lying on your back under a somewhat rusty undercarriage. Connectors were easy to mate and the whole thing worked on the first try. Lots easier than cutting and splicing wires. Just plug and play.


Easy Install

1999 GMC Sonoma

Great fit for my small truck. I’ve wired in my own trailer wiring harness and this product took all the work out of the installation and allowed me to haul away. I’d fit this style adapter to any of my future ventures.

2003 Chevrolet S-10 Pickup

SO much better than hacking apart a factory wire harness. Extremely easy installation. Luckily on the s10s, the rear grounding bolt for the tail lights and fuel pump is literally where the connector is this trailer light harness plugs into. All you have to do is open up the ground eyelet on the harness with progressively larger drill bits (don't just try the size you need you'll ruin the eyelet, ask me how I know that....) and it will fit right over the bolt and provide a known good ground without drilling holes in the frame. Very fast shipping and excellent customer service. Awesome company and product.

2002 Chevrolet S-10 Pickup

This is a rediculously easy harness to install. Worked the first time, and the instructions are easy to follow.

Still working great! No corrosion issues, despite being in a salting state!
James S - 06/09/2017


Purchased the trailer harness for my chev. s10. It was a very satisfying solution to an otherwise expensive problem. Very pleased, still works and it simply plugged in and that was it. Better than paying a trailer and hitch shop 150.dollars and waiting w/o my vehicle. Cost I believe was 20 something dollars and came to my door a few days later.


Received my package from UPS on time. The box was torn and the hitch was protruding but it was to be expected with a heavy item in cardboard packaging. The hitch, hardware, and wiring harness all in same package. Hitch fit perfectly. No drilling required. Took a little motivation to get the holes lined up and all the bolts in. Tight fit. No complaints here.

Show More Reviews

See what our Experts say about this Tekonsha Custom Fit Vehicle Wiring

  • Recommended Trailer Wiring Harness for 2003 Chevy S-10 Pickup
    We have a few custom-fit trailer wiring harnesses available that are confirmed to fit your 2003 Chevy S-10 pickup, all of which install by plugging into the same factory port that should be located at the rear of the truck, inside the the driver's side frame rail. If this is where you found the plug that you described in your question, and it looks like the plug that is on the image I have attached, then this is indeed where an aftermarket harness will plug into. For this, I recommend...
    view full answer...
    Image 1 for
  • Do I Need a Trailer Taillight Converter for a 2003 Chevy S-10
    The plug and play trailer wiring harness options we offer for a 2003 Chevrolet S-10 are all non-powered meaning they will pull power from the vehicle's taillights. This is perfectly fine for smaller trailers that don't use as many lights. I recommend the T-One Vehicle Wiring Harness part # 118359.
    view full answer...
  • Will Tow Ready T-One Wiring Harness Fit 2003 Chevrolet S-10 Xtreme
    The Tow Ready T-One Wiring Harness, part # 118359 is designed to fit your S-10 Xtreme. You just plug the 118359 harness into the plug located under the left rear side of the truck on the frame rail. Then find a suitable spot to attach the ground connection, route the harness to the back of the truck and you are good to go. I have attached a link to an installation video of this harness on a 2003 S-10 you can check out. When working with electrical connectors I recommend using dielectric...
    view full answer...
  • Difference Between Curt and Tow Ready T-Connector Wiring Harness with 4-Pole Flat Trailer Connector
    Both 4-pole wiring harnesses available for your 2000 Chevrolet S-10 Pickup, Curt # C55359, and Tow Ready # 118359, are custom-fit types that plug into connectors on the vehicle. Functionally speaking there is no difference between the two. Most of the harness is manufactured by the same company. Other than the way the harness is spliced together they are pretty similar. The Tow Ready is more popular with our customers, probably because it is less expensive. I have attached the installation...
    view full answer...
  • Trailer Hitch Recommendation for a 2003 Chevy S-10 with Factory Step Bumper
    The most popular hitch we offer for your 2003 Chevy S-10 that would work great is the Draw-Tite part # 75051. This hitch would have more than enough capacity as it is rated for 3,500 lbs total trailer weight. I attached an install video for you to check out as well. Since 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...
    view full answer...
  • Trailer Hitch Recommendation for 2003 Chevy S-10 with Stepside
    The Draw Tite hitch part # 75085 is a fit for your 2003 Chevy S-10 with the sportside non-towing bumper that you have. It would be a great option. For trailer wiring you then would want the part # 118359. 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...
    view full answer...
  • Troubleshooting Wiring Harness on 2003 Chevy S-10
    It is likely the result of a bad ground, but in order to determine the specific problem you encountered after installing harness # 118359 you'll need to use a circuit tester such as # PTW2993 to test the connector on your S-10 after disconnecting it from your trailer. Check the wiring going into your harness from your taillights to see if those wires are carrying the correct signals, if not then the issue is with the vehicle wiring. If the signals going to your harness are okay, you'll...
    view full answer...
  • Hitch Recommendation for a 1998 GMC Sonoma Sportside
    The hitch you would want for your 1998 GMC Sonoma that has a Sportside step side bed is the Draw-Tite Trailer Hitch # 75085. This hitch is a confirmed fit for your vehicle and should work well to tow your light duty 8 foot enclosed motorcycle trailer as long as the weight of the trailer does not exceed the capacities of your vehicle and this hitch. This hitch is capable of towing a trailer with a total weight of 3,500 lbs and tongue weight of 350 lbs. To determine the towing capacity of...
    view full answer...
  • Trailer Wiring Options for a 1998 Chevy S-10
    Based on what you described it either sounds like your truck is wired differently than normal (which is highly unusual) or you are looking at the wrong connectors for trailer wiring. The part # 118359 should be the correct fit. But if the connectors are truly different you could just hardwire the 4-way with part # 18252.
    view full answer...
  • Recommended Wiring and Trailer Brake Controller for 1998 Chevy S-10 Pickup
    We have everything you need to install a trailer brake controller on your vehicle, however there is not a plug-in wiring adapter available for your 1998 Chevy S-10 truck. The wiring components you need will depend on what your S-10 is already equipped with. If you currently do not have any trailer connector installed, you will need to start with a 4-Way harness. For this, I recommend the Tekonsha T-One Vehicle Wiring Harness # 118359. This custom harness will install by connecting to...
    view full answer...
  • Will Curt Trailer Hitch C13021 Interfere with Spare Tire on a 2000 GMC Sonoma
    You will be able to keep the spare tire with Curt trailer hitch # C13021 installed on your 2000 GMC Sonoma. There is a note in the instructions, linked for reference, stating that some spare tires may need to be lowered and repositioned for hitch installation. It does not specify sizes though. Usually what this means is that spare will need to be pushed towards the front of the vehicle some. If you plan on doing some towing I recommend etrailer ball mount kit # 989900. It comes with 2...
    view full answer...
  • Will Curt Hitch C13021 fit 1999 Chevy S-10 Stepside?
    Curt hitch # C13021 will fit your 1999 Chevy S-10 stepside. If you are going to be towing you'd need 4-flat connector you would want to use T-One Wiring Harness # 118359. For a ball mount, I recommend checking out Ball Mount Kit # 989900, which may fulfill your towing needs in one tidy package; two ball mounts - one with a 3/4” rise or 2” drop and the other with a 2-3/4” rise or 4” drop - a 1-7/8” hitch ball, a 2” hitch ball and a pin and clip. In order to choose the correct ball mount,...
    view full answer...
  • Recommended Wiring Harness for 1998 GMC Sonoma
    If you are looking for a wiring harness for your 1998 GMC Sonoma to install a 4-way trailer connector, I recommend the Tekonsha T-One Vehicle Wiring Harness # 118359. This will allow you to quickly install a 4-way trailer connector that will power your trailer's signal lights. No cutting, splicing or tapping will be required. I have attached the installation details for you to check out. If you are wanting to install a brake controller like the excellent Tekonsha Prodigy P2 # 90885, you...
    view full answer...
  • Tekonksha Prodigy P2 Brake Controller # 90885 Installation in a 2000 Chevrolet s10
    Yes, to install a Tekonsha Prodigy P2 Brake Controller # 90885, you will first need to have a 4-way present at the rear of your 2000 Chevy S10. If you do not have a 4-way you would need a Tow Ready Custom Fit Vehicle Wiring # 118359. I attached installation instructions and an installation video for you to check out also. Once installed you would need a Brake Controller 7 & 4 Way Installation Kit # ETBC7. This will convert the 4-way to a 7-way and allow you to install a brake controller...
    view full answer...
  • Trailer Hitch Recommendation for a 1998 GMC Sonoma
    The Draw-Tite Trailer Hitch, # 75500, is designed to fit the follow vehicles: 1973 - 1991 Chevrolet Suburban 1973 - 1991 GMC Suburban But not the 1998 GMC Sonoma. For the Sonoma, I have included a link to the available trailer hitches. For a Draw-Tite hitch, go with # 75085. This is a Class III trailer hitch rated for 350 pounds tongue weight capacity and 3,500 pounds gross trailer weight. It can also be used with weight distribution for 600 pounds tongue weight capacity and 6,000 pounds...
    view full answer...
  • 4-Pole Trailer Wiring Harness for 2002 Chevrolet Blazer
    Wiring harness part # 118359 fits certain Chevrolet S-10 pickups and GMC and Isuzu vehicles but not your Blazer. For your 2002 Blazer you can use 4-pole harness # C58044 or # C55411 which will be hard-wired installations. Part # C55411 includes a plastic wire loom to protect the wiring itself and both kits include the fasteners to connect to the vehicle wiring. You'll find the factory wiring either behind the rear bumper or along the driver's side frame rail. We do not offer any custom-fit...
    view full answer...
  • Recommended 4-Way Trailer Wiring Harness For 1996 Chevrolet S-10
    The correct wiring harness for your 1996 Chevrolet S-10 is part # HM41115. You just plug this harness into the wiring harness on your truck that is located under the truck on the driver side frame rail. Then just attach the ground wire to a clean bare metal surface. Then you are ready to go. The wiring harness you asked about is not a fit for the 1996 S-10. When working with electrical connectors I recommend using dielectric grease like part # 11755. This keeps dirt and moisture out...
    view full answer...
  • How Would a 2000 GMC Sonoma Activate the Brakes of a Traile
    To activate the brakes of your trailer will require you to install a brake controller. There isn't a way to tie your vehicle braking system into the braking system of a trailer but you can install a brake controller in your 2000 GMC Sonoma so that it can activate them as needed. A brake controller is a device that is designed to activate trailer electric brakes by using a signal with varying voltage to apply the brake either lightly or heavily. Proportional brake controllers are the way...
    view full answer...
  • Hitch for 1999 Chevy S-10 LS 2WD Pickup
    For the 1999 Chevrolet S-10 LS 2WD pickup we offer hitch # 75085. My tech contact at Draw-Tite confirmed the fit of this 2-inch Class III hitch. The written instructions for this hitch and a helpful installation article are linked for you. All mounting hardware is included. If you also need a 4-pole trailer wiring harness you can use Tekonsha part # 118359. Installation of this harness is shown in the linked video. You may care to add a mounting bracket setup for the 4-pole connector using...
    view full answer...
  • Is The Draw-Tite # 75085 Compatible With A 2000 GMC Sonoma 4x4?
    For your 2000 GMC Sonoma 4x4, the Draw-Tite Max-Frame Trailer Hitch Receiver # 75085 is a confirmed fit for the Sportside with non-towing bumper as well as the Factory Step bumper. It is not a fit for the ZR2 models or the Factory Roll Pan bumper. It will fit on trucks without a factory bumper as well. There is no difference in fit for a 2WD version or a 4x4. This hitch has a black powder coat finish over an e-coat base. It is a sturdy square tube design. The cross tube is concealed...
    view full answer...
  • Fit of Curt C13021 Class III Hitch on 2002 GMC Sonoma With Step Bumper
    The Curt Class III hitch you'd looked at, part # C13021 is indeed a fit for the 2002 GMC Sonoma with the factory step bumper, as shown in the provide photo. If you'll be using the hitch for towing, you can install a 4-pole trailer connector using part # 118359. You'll also need a ball mount like # 2923 and a trailer ball like # 19260 for a 1-7/8 inch or # 63845 for a 2 inch ball.
    view full answer...
    Image 1 for
  • Recommended Trailer Hitch Receiver For 1998 Chevy S10 Sportside With Roll Pan Bumper
    We have a hitch that will fit your 1998 Chevy S-10 Sportside with Roll pan bumper. It is the Draw-Tite Max-Frame Trailer Hitch Receiver - Custom Fit - Class III - 2" # 75085. If you will be towing with this receiver, I recommend the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118359. This custom-fit T-One connector plugs into your vehicle's wiring harness, which is located at the rear, along the inside of the driver's side frame rail. I've attached an installation...
    view full answer...
  • Draw-Tite Trailer Hitch # 75085 Recommendation for a Chevy S10 Long Bed
    As long as the bumper on your 2003 Chevy S-10 long bed is a step bumper and not a roll pan bumper this Draw-Tite Trailer Hitch, part # 75085, would work very well for you. I attached installation instructions for this product below for you to check out also. You may be interested in the following products to complete your tow setup also: Tow Ready Custom Fit Vehicle Wiring, part # 118359 (instructions and instructional video below) Ball Mount 3/4 inch Rise or 2 inch Drop, part # 2923 Hitch...
    view full answer...
  • What Hitch Fits A 1999 GMC Sonoma Without A Step-Up Bumper And No Cutting Of Rear Fascia
    Yes, I will be able to help you get the correct hitch. The hitch you will need for your 1999 GMC Sonoma with rear fascia and no step bumper is the Curt Class III Trailer Hitch, # 13920. It is a 2 Inch Class III hitch that has a Gross Towing Weight of 3,500 lbs. and a Tongue Weight of 350 lbs. The Draw-Tite Trailer Hitch, # 75085, you have referenced is for 1999 GMC Sonomas with step-up rear bumpers. If you will be towing, you will need the Draw-Tite Ball Mount, # 2923, and the Pin and...
    view full answer...

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