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  1. Custom Fit Vehicle Wiring
  2. Tekonsha
  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 4 Flat
  6. No Converter
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

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

Item # 118407
Our Price: $37.75
You Save: 40%
Custom Fit Vehicle Wiring

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Tekonsha Custom Fit Vehicle Wiring - 118407
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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. 1-800-940-8924 to order Tekonsha custom fit vehicle wiring part number 118407 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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Tekonsha Custom Fit Vehicle Wiring - 118407

  • 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 in rear cargo area
    • 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 inside your trunk or cargo space, behind the tail lights on both the driver's side and passenger's side. You will need to remove some interior trim or carpeting to access this harness.

Once installation is complete, the 4-way flat connector will be stowed in an out-of-the-way location within your cargo area.

It is recommended that you use a small amount of grease on all electrical connections - the plugs on your automobile and the 4-pole connector itself - to help prevent corrosion.

118407 Tow Ready T-1 T-Connector - 4 Wire

Installation Details 118407 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 - 118407

Average Customer Rating:  4.8 out of 5 stars   (138 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.

2007 Chevrolet HHR

It took me maybe 10 minutes to wire up the trailer, only that long because I had to rewire a tail light on the trailer itself
This product is pretty self-explanatory

2009 Chevrolet HHR

Haven't seen it yet

Etrailer Expert

Jenny N.


Whoah, the box had a rough trip. I will have our Customer Service team reach out. If anything is missing we can replace it.


Wiring harness simple to install and hitch appears to be well made.


Very easy to install. Still working gre at.


Great product. It was the perfect fit for my vehicle and trailer. Easy instalation and still works to this day!



The product is working like its intended. Easy install and works still.

Etrailer Expert

Mike L.


@Artem Good deal, we're glad to hear that your # 118407 trailer wiring harness is working well for you!

1994 Ford Mustang

The trailer hitch went on very easily I had no problems the instruction were very good. The same with the wiring harness no problems. I put your hitch on my 1994 Mustang a few years ago and had no problems that’s why I bought another one for my Chevy HHR SS from you guys.

2010 Chevrolet HHR

Great quality easy to install Doesn't get any better than that!


Easy to use, good directions. Year later still working great.

2010 Chevrolet HHR

Good product with easy installation. I'm an electrician, but do not like making wiring alterations to factory wiring on my vehicles. The wiring harness with plug adapters allowed installation with out making splices. There was some confusion in the written installation instructions on which side of the vehicle the green wire plug goes to. After refering to the installation video on the e-trailer web site this issue was perfectly clear.

David S.


Thanks for the follow up, and for being customer service driven.To answer you question, I am still pleased with the products I purchased from am in need of a wiring harness for another vehicle, and because of you good service, I will be purchasing it from etrailer.


Fantastic product !!! I've had many , many trailers in my life...Boat , toy haulers , and construction trailers . I had the wiring done 15 minutes after the Mailman left it NO KIDDING ! easy , easy , easy ! instructions and video were spot on. i would never hesitate to order again . only downside was it took 9 days to get this item to North Carolina ! So i had plenty of time to study the video !!!

Jim S.


absolutely as specified! when I get a new car,Im calling etrailer

2009 Chevrolet Cobalt

I haven't yet installed the wiring but in the past have installed non vehicle specific wiring for trailer towing. I am looking forward to not having to cut and splice the wires!




Chevy HHR

The hitch package arrived lightning fast. I had it installed within an hour. I had watched the installation video before the hitch arrived so that I kwew what tools I would need. It was sooooo easy. I followed the video instruction step by step and with the help of a friend to fit it into place the job was done in a snap. A floor jack was all that was necessary to drop the exhaust down for the installation. The wiring is a no-brainer. I am very pleased with the price and the support. I would buy from this company again and I recommend it to anyone looking for this type of accessory. My car and the bike rack look great and I saved a ton of money. Good job Etrailer.

2006 Chevrolet HHR

Super quick and easy to install with the instructional video seen online. Worked the first time I plugged it in. Are trailer lights even supposed to do that? :)

Etrailer Expert

Laura E.


Why, yes...yes, they are :

2008 Chevrolet HHR

Great product. Easy hook-up, anyone would be able to install it, with just unplug original connections and connect new wiring harness. Then connect the wires you unplugged into the other connectors left on your wiring harness and your done. No splicing wires or making a mistake and getting frustrated. With this wiring harness product from this is the way to go. Thanks.

2010 Chevrolet HHR

Being an old school guy and splicing trailer harness' the old fashioned way- this harness item 118407 was installed in less than 10 minutes. In addition- the trailer hitch was installed on my wires HHR in less than an hour. The hardest part was fishing the bolt and spacer through the chassis. And the install was done on the floor with a floor jack. I would strongly recommend e-trailer equipment to anyone. And Pat from E-trailer was top notch and parts were delivered as promised

Chevrolet HHR

I purchased draw petite hitch, drawbar ball and wiring harness from etrailer
All seem to be high quality parts, it took me approx. 1 hour for total install on my hhr,happy with result, fast shipping and excellent service


At last, a 10 minute job that really took 10 minutes! I watched the install video and went at it. EVERYTHING was just like in the video. The longest part was slipping the split plastic conduit over the wiring to protect it. Looked nice too (better than the wrapped electrical tape in the video). This was a left over from another project and matched what the factory used.

The dust cap on the end of the trailer plug was a nice touch. Two thumbs up for this product.


Order was $xxish and paid $xx for one day shipping. Ordered Sunday. Monday was told that I wouldn’t get my parts til Thursday. Beyond pissed. Today (Wednesday) I received one of 3 items. God knows when I’ll get the rest. I will NEVER order from here again. I was to have parts installed Wednesday and leave from Pittsburgh to Kansas on Friday morning. PISSED

2011 Chevrolet HHR

wiring was simple to install, I found a rubber grommet in the tire compartment so I cut the wire harness, pushed it through the harness so the wire comes out right next to the hitch, hidden wiring too. spliced the wire and added shrink tubing to make it waterproof.


Exact fit went on easily. Bought some split wire loom for a finished look. Works great

Chevrolet HHR

Excellent Product, Fine Materials, and workmanship.
a breeze



Excellent Easy Install and performance

Chevrolet HHR

I’ve been a heavy equipment mechanic for over 40 years and repaired and replaced many wiring harnesses this one for my HHR is great quality and a lot of thought went into the design. I would buy this again


Love these t-connector products!!!! This is the second one I have purchased and it makes tailer wiring easy and worry free along with never worrying about corrosion of the pigtail ends.


Installation instructions are top notch. Wiring harness plug and play. Great set up

2007 Chevrolet HHR

I had this product, along with a trailer hitch, installed by a technician at my local Chevrolet dealer. The technician did not mention having any problems installing this wiring harness, so I guess this is a good product.

Show More Reviews

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

  • Is There a Trailer Hitch for 2010 Chevrolet HHR With Heavy Tongue Weight Capacity
    The only trailer hitches that fit a 2010 Chevy HHR are Class I hitches with a 1-1/4 inch receiver, 2,000 lb towing capacity and 200 lb tongue weight capacity. The reason is because these vehicles simply don't have the capacity for that much extra weight, and aren't designed with that purpose in mind. Five hundred pounds is a very large amount of tongue weight, and the only vehicles that have hitches with that much capacity are large trucks or SUVs. The only option to transport a mobility...
    view full answer...
  • Hitch Recommendation for a 2006 Chevy Cobalt
    Based on the size of the food cart you have the only option I can recommend for you would be to install a hitch on your 2006 Chevy Cobalt like # C11430 or part # 24756 if you have an SS model and tow a small trailer. The dimensions of the food cart are too big to fit on a cargo carrier. The hitch I recommended comes with pin and clip. You will still need a ball mount. For a ball you can use # 19256 (1-7/8 inch diameter) or # 19258 (2 inch diameter). You will need to check the coupler...
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  • Parts Needed to Tow a Trailer with a 1998 Honda CR-V/2005-2010 Chevrolet Cobalt/Pontiac G5
    For starters, the Curt Trailer Hitch Receiver part # C11430 is for a 2005-2010 Chevrolet Cobalt and the 2005-2006 Pontiac Pursuit. If you instead have a 1998 Honda CR-V which is what you entered into our fitguide then you will want to use the Curt Trailer Hitch Receiver part # 13314 instead. Even if you will not be towing anything heavy you will still want to use the largest trailer hitch available as that will give you the best performance and availability of accessories. Regardless,...
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  • Which Curt Trailer Hitch Fits a 2010 Chevy HHR
    Curt Trailer Hitch, # 11430, is designed to fit various years and models of the Chevy Cobalt coupe and sedan but not the Chevy HHR. For a 2010 Chevy HHR the correct Curt trailer hitch is # 11447. I have included links to the instructions and a video showing a typical installation for you. The hitch comes with the correct ball mount, hitch pin, and clip. If you plan on doing some towing you can use 1-7/8 inch ball # 19256 or 2 inch ball # 19258. For trailer wiring use # 118407. I have linked...
    view full answer...
  • Recommended Trailer Hitch and Ball Mount for a 2009 Chevy HHR
    The trailer hitch I recommend is the Draw-Tite Class I # 24756 and Draw-Tite ball mount # 3594 because the top of the receiver to the ground is 10-1/4 inches and the ball mount will give you a 4-inch rise. As a result, giving you a 14-1/4 inch ground clearance and stay above the 13-1/2 inches. The weight will bring the clearance down a tad from the 14-1/4 inch clearance which will keep your trailer more level. The wiring for your 2009 Chevy HHR is # 118407 and 1-7/8 hitch ball is # 19256.
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  • What Is The Maximum Towing Capacity For A 2009 Chevy Cobalt And Will The Curt Hitch, # 11430, Fit
    I checked the maximum towing capacity for your 2009 Chevy Cobalt and it was 1,000 lbs. You might want to check your owners manual or with the Chevy dealer to verify that 1,000 lbs. is the correct maximum towing capacity of your 2009 Chevy Cobalt. The Curt Class I Trailer Hitch, # 11430, will fit on your 2009 Chevy Cobalt, as long as it is not a SS model. This hitch has a 2,000 lbs. towing weight capacity and a 200 lbs. tongue weight capacity. It is a 1-1/4 inch receiver opening. The ball...
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  • How To Install Trailer Brake Controller On 2007 Chevy HHR
    In regards to installing a trailer brake controller like the Curt TriFlex Trailer Brake Controller part # C24VV on a 2007 Chevrolet HHR you'll need a few things, the first being a trailer connector like the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118407. This can then be converted to a 7-way using a kit like the Brake Controller Install Kit part # ETBC7 which has everything else you need. The black wire from the controller will go to the battery with one...
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  • Trailer Wiring harness Recommendation for a 2008 Chevy HHR
    Yes, the Tow Ready Wiring Harness part # 118407 that you referenced has been confirmed to fit your 2008 Chevy HHR. This harness actually fits 2006-2011 HHRs.
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  • Hitch and Trailer Recommendation for a 2011 Chevy HHR
    The only way you could transport a 500 handicap scooter with your 2011 Chevy HHR would be for you to install a hitch like part # 24756 and then use a small trailer. A cargo carrier setup wouldn't work because your vehicle wouldn't have the tongue weight rating to suspend the weight of your 500 lb wheel chair off the ground unsupported. To complete your towing setup you would also want a ball mount, the # 118407 for trailer wiring, # 19256 for a 1-7/8 inch hitch ball, and # 19258 for a...
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  • Is Plug And Play Trailer Wiring Harness Available For 2001 Toyota Solara
    The # 118407 trailer harness wiring kit is not designed as a fit for your Solara, but we do have trailer wiring harnesses that can be hardwired. It is a little more work but really not that tough. I recommend a kit like part # C59496. This kit includes the Modulite that helps protect the Solara wiring and a circuit tester to help you identify the correct wires on your Toyota when installing the harness. You can have someone sit in the driver seat and go through the functions while you...
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  • Trailer Lights Go Out When Pressing Brake Pedal with 2006 Chevrolet Cobalt Trailer Wiring
    First, I recommend testing the 4-way flat trailer connector on the rear of your 2006 Chevrolet Cobalt. You will want to use a circuit tester, like # PTW2993, to test for right turn, left turn, and brake signal at the connector. I have attached a video demonstrating how the test the 4-way. If everything is functioning properly at the connector, then you will want to move to the trailer. It sounds like it may be a ground issue. When you step on the brake, a higher voltage is require to...
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  • Ball Mount Recommendation to Clear the Back of a 2007 Chevy HHR
    If you were to use ball mount # C45014 on your 2007 Chevy HHR it would be very tight so I do recommend going with the longer # C45015. If you have or are looking at hitch # C11447 then the ball mount that Curt recommends is # C45520 which is about the same length as C45015 so it would also have enough length. For either ball mount if the trailer takes a 2 inch ball use # C40018. And if it takes a 1-7/8 inch ball use # C40001. And if you don't already have a trailer wiring harness you can...
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  • Parts Needed to Tow a Trailer with a 2006 Chevy HHR
    According to the owner's manual for the 2006 Chevy HHR the maximum towing capacity of the vehicle is 1,000 pounds. If you are able to get the weight down to that then you can tow a trailer using the following parts: Trailer hitch # C11447 Ball mount # C45520 2 Inch Ball # C40018 or 1-7/8 inch ball # C40001 Wiring harness # 118407
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  • How To Determine What Size Ball Mount Will Fit On 2006 Chevy HHR
    Your 2006 Chevy HHR has a Class I 1-1/4 inches hitch receiver, so you would use the recommended ball mount that will fit your Class I 1-1/4 inches receiver. The Draw-Tite Ball Mount, # 3594, is the recommended ball mount that will safely work on your Class I hitch. You will also need the hitch ball for the ball mount. The hitch ball size will depend on the coupler size on the trailer. It would be either 1-7/8 hitch ball like the Tow Ready Ball, # 19256, or a 2 inch hitch ball like the...
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  • Recommended Ball Mount and Other Towing Accessories for 2011 Chevy HHR
    For your 2011 Chevy HHR, our friends at Draw-Tite recommend the 4 inch Rise Sportframe Drawbar, part # 3594. To complete your towing system, you might also need the following: 1-7/8 inch trailer ball, part # 19256 2 inch trailer ball, part # 19258 Pin and clip, part # PC2 Locking hitch pin, part # e98879 Trailer Wiring Harness, part # 118407 To see the recommended products and to view a wiring install video, click on the provided links.
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  • Recommended Trailer Wiring Harness for 2007 Chevrolet HHR
    The trailer wiring harness I recommend for your 2007 Chevrolet HHR is the Tow Ready T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118407. This harness will plug into your vehicle's wiring behind the side panels in the rear cargo compartment. The 4-Way flat connector on the wiring harness will connect to the 4-Way flat connector on your trailer or lighted cargo carrier. I have attached an installation video of this wiring harness on a 2011, as well as a video on a 2006,...
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  • Choosing the Correct Trailer Hitch and Accessories for a 2008 Chevy Cobalt LT1
    For the 2008 model year, the Draw-Tite trailer hitch # 24756 fits the Sport, Sport Sedan, and SS Coupe models of the Chevy Cobalt. If you have a regular sedan or coupe model you would need the Curt hitch # C11430. The underside of each may look similar but the mounting locations and hitch design are different which is why there are different hitches for each. I have included links to the installation instructions for both hitches for you to view. If you require the first hitch, 24756,...
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  • Installation Of Tow Ready T-One Trailer Wiring Harness On 2006 Chevrolet Cobalt
    When installing the T-One Vehicle Wiring Harness, part # 118407 in your 2006 Cobalt, you will need to access the rear cargo area and remove the spare tire cover first. Then you will need to get access to the back of the tail lights by moving the carpeted liner. Then unplug the connector from the back of the tail lights and connect the T-One harness with the yellow and brown wire to the left tail light connector. You will need to attach the white ground wire with the ring terminal to the...
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  • Using T-1 Wiring Harness, Part # 118407 for Lighting Vehicle Towed By RV
    The T-1 Vehicle Wiring Harness, part # 118407 is designed for towing a trailer behind a 2007 Chevy HHR. It will not work for towing behind an RV, because the harness is designed for output only. To light your HHR while it is towed behind your RV, you have three alternatives. You can use a magnetic mount lighting system, like part # RM-2120. This system is very easy to install and use. It also remains completely independent of the towed vehicles wiring system. For occasional towing, or...
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  • Which Wiring Harness Fits the 2007 Chevrolet Cobalt Coupe VS the Sedan Model
    The correct Wiring harness for the 2007 Chevrolet Cobalt Coupe is the Custom Fit Trailer Wiring, item # 118407. This harness is designed specifically for the 2 door model. The T-One Vehicle Wiring Harness, item # 118398, has different connectors to match the connectors on the 4 door sedan models of the Cobalt.
    view full answer...
  • Which Trailer Wiring Harness Will Fit a 2006 to 2011 Chevy HHR
    We do have a wiring harness for the 2006 to 2011 Chevy HHR. Take a look at Tow Ready Custom Fit Vehicle Wiring, # 118407. I have included a link to the installation details and a video showing installation of the harness on a 2007 Chevy HHR. The T-One Vehicle Wiring Harness with 4-Pole Flat, # 118398, is not designed to fit the Chevy HHR. It is designed to fit compact Pontiac and Chevy sedans and coupes like the Cobalt.
    view full answer...
  • Does the Rear Bumper have to be Trimmed to Install a Trailer Hitch on a 2011 Chevy HHR
    If you have a 2011 Chevy HHR and it is an SS model, there is a small section that needs to be trimmed in the rear fascia for the hitch to fit properly. I have included a link to the installation instructions that shows where you would need to to trim. On non-SS models, you should not have to trim and the isntallation should be like the video I have linked. If you plan on doing some towing, the hitch comes with the proper ball mount, pin and clip. For a 1-7/8 inch ball use # 19256 and for...
    view full answer...
  • Lighted Hitch Cover for 2008 Chevrolet HHR
    For your 2008 Chevrolet HHR with 1-1/4-inch hitch you can use the Skull with L.E.D. Eyes Trailer Hitch Receiver Cover # CR-018. If a skull with glowing red eyes is not your cup of tea, you could use the Trailer Hitch Receiver Adapter 1-1/4" to 2" Hitch - 6-1/2" Long # e43YR with the Flint Hill Goods Square LED Brake Light Hitch Cover for 2" Hitches # FHG72VR. The adapter would allow you to use the 2" # FHG72VR on your 1-1/4" hitch, but it will stick out 6-1/2". These lights require...
    view full answer...
  • Hitch Recommendation for a 2009 Chevy Cobalt Coupe
    If your 2009 Chevrolet Cobalt is not an SS then you would want a Curt Trailer Hitch, part # C11430. I attached installation instructions as well as a link to a video of this hitch being installed on a similar vehicle as yours below. If your Cobalt is an SS then you could use a Draw-Tite Hitch, part # 24756, like you referenced. I attached installation instructions and a video of this hitch being installed on a vehicle that is similar to yours below also. You may also be interested in...
    view full answer...

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Info for this part was:

Employee Mike L
Expert Research:
Mike L
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Expert Research:
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Video Edited:
Zack K
Employee Joshua S
Video Edited:
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Employee Nicholas E
Test Fit:
Nicholas E
Employee Rick A
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Rick A
Employee Laura H
Updated by:
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