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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 # 118389
Retail:$68.39
Our Price: $44.65
You Save: 35%
Custom Fit Vehicle Wiring

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Custom Fit Vehicle Wiring 118389 - Converter - 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 existing wiring - no cutting, splicing or tapping required. Circuit-protected converter guards against shorts. 1-800-940-8924 to order Tekonsha custom fit vehicle wiring part number 118389 or order online at etrailer.com. 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 (56)
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Tekonsha Custom Fit Vehicle Wiring - 118389

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • 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. Circuit-protected converter guards against shorts.


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 in rear cargo area
    • Plug in T-connector
  • Includes circuit-protected tail light converter to ensure that your vehicle's wiring matches that of your trailer
    • Provides protection against electrical shorts and overloads
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


Specs:

  • Maximum amperage:
    • Stop/turn lights: 2.1 amps per circuit
    • Tail lights: 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 interior trim panels in your rear cargo area.


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.


Circuit-Protected Tail Light Converter

A tail light converter 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. The tail light converter combines 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.


This converter safeguards itself and your vehicle against possible electrical shorts and overloads with integrated short circuit protection. Just install the connector as indicated and rest assured that the wiring system of your vehicle will remain feedback-free.



118389 Tow Ready T-1 T-Connector - 4 Wire

Installation Details 118389 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 - 118389

Average Customer Rating:  4.9 out of 5 stars   (56 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. Circuit-protected converter guards against shorts.

by:
Toyota RAV4

Extremely well constructed. This product was the easiest item I have ever installed. I was extremely impressed that a video was also sent to me on how to install the curt hitch and how to wire it in.



by:
2004 Toyota RAV4

Glad I found etrailer.com . Really easy to find the right harness for my Rav 4 and the instructional videos instilled a great confidence that I could do the install myself. Helpful hint to read all the reviews and watch all the videos from the various harness options as they might not all give the little nuances that help the job go easier. For example, this unit is designed to feed out the back hatch and have the door closed on it when needed but it appears as though I can also run the end through a hole in the bottom of my hatch area that has a rubber plug if I wanted to have it installed permanently on the hitch.

Etrailer Expert

Mike L.

12/27/2018

Unless you are towing very frequently, youd be better off leaving the trailer connector safely stowed in the cargo area of the vehicle where its protected until needed.



by:
2003 Toyota RAV4

The trailer hitch and trailer light kit for my 2003 RAV4 was perfect. I installed both myself in about an hour. I hooked up my trailer and it all worked for me perfectly. Thank you.

Kenny A.

2/10/2018

Love the hitch and wiring. My son recently bought the same for his RAV4.



by:
2003 Toyota RAV4

I was in an emergency hurry for this item and etrailer promised the fastest shipping compared to several other retailers. I'm a first time customer and etrailer came through. Product is as expected, and pricing was very competitive. Also, etrailer's tracking system is better and way more detailed than Fedex and UPS. I don't understand that, but UPS showed me like two entries while etrailer had a whole page of every event that happened throughout the delivery trip./ A+!



by:

no hassle process through and through. as well as customer service conformation followup with kindness and detail. Thanks



by:
2002 Toyota RAV4

After trying to use a generic wiring harness from Advanced Auto I ordered this product for my 2002 RAV4. It arrived quickly and was very easy to install. It worked without any problems. No splicing, just plug and play.

Tina

4/29/2015

Still Working Great



by:

Hello etrailer,
really appreciate the
package sent specific for my car. High quality parts packed carefully in a box. The item came sooner than expected. Now I am wiring a trailer. If wiring kits are sold from etrailer, I would buy it. Really appreciate the installation video. Saved a lot of time and frustration.



by:
Toyota

Trailer light wiring harness works great for 2002 Toyota Rav 4. Easy to install, lights are bright, no issues at all after one year. Highly recommend!!!



by:

The product came quickly and without any difficulty. I surprised myself by following easy instructions the job was done far easier than I had anticipated. This trailer hitch is about the only "hitch" this move has hit on a positive note. Thanks.



by:

I am excited to say as a woman, "I installed this all by myself." It is as easy as they claim. I love that ETrailer has the videos that show the product and how to install. Anyone can install after watching the videos. It shows exactly what needs to be taken off and how to take it off. I was afraid of breaking the trim on my car until I watched how to remove it and saw that clips hold it on....Thanks ETrailer!



by:

Everything installed and worked as advertised. The videos helped a lot and the wiring could not have been simpler. "Thanks for a nice product. Paul

Paul R.

10/27/2017

Its still good and works flawlessly. I will soon be ordering another one from you for a 2014 Toyota Rav 4.



by:

Price was very competitive and the website was very up front that it would fit with my particular model. It got here in 3 days and was very easy to install. Etrailer does a very good job on notifying you along the way.

Aggie

1/24/2021

Fantastic! No issues



by:

Within 3 hours of UPS dropping of hitch and wiring kit, everything was installed without a problem. Just as the demo movie showed. No surprises at all. Good product, great customer service, and fair price. What more could you ask for?



by:
2005 Toyota RAV4

I ordered a hitch and wiring for my daughters RAV4 . It came promptly and was precisely what I ordered. It was the simplest hookup I've ever dealt with. Great service, great product. Thanks, Gary



by:

Glad I picked the plug and go trailer lighting harness. Simple as 123. Well worth the extra cost.



by:
2003 Toyota RAV4

Almost as easy as installing the hitch. The videos were great, I have an '03 and just checked, everything works great. Now, I just need that trailer.



by:

I found this product on your web-site and was really surprised. It showed me step by step how to install and I was all done in less than 30 minutes. The T-one vehicle harness #118389 was worth every penny I had to pay!! Thanks for you help!! Don Belk



by:

Product easy to install and works great. Trailer lights much brighter than previous kit that failed.



by:

Etrailer is the source! An easy-to-use website, good pricing, fast delivery, clear instructions, and - most importantly - everything fit my car and works!



by:

Although I haven’t opened the box yet to check the product I felt that an initial rating of the fast service would be helpful. Very pleased with the response time from when I clicked order to picking up the box from my front door.



by:

Product was easy to install and has served well. Hitch is quality product.



by:
2004 Toyota RAV4

This product was exactly as advertised instructions were spot on and very easy to install without having to cut any wire it truly was plug and play



by:

Very easy install. The only part of the process that takes much time is prying away the interior panels. Start to finish, this was around a 30 minute job. Excellent product.



by:
2003 Toyota RAV4

Really well made, quality product. Directions are thorough but call for several zip ties, while only one is supplied....so you'll want to have some on hand.



by:
2010 Buick Enclave

Easy installation, the video made every step very clear. Will order from Etrailer again.


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Show More Reviews

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

  • Ground or No Ground for Installing a 4-Way Trailer Wiring Harness on a 2004 Toyota Rav4
    You are correct the Tow Ready Custom Fit Vehicle Wiring, item # 118389, has a ground wire that is attached to a ground location behind the vehicle tail light and the Hopkins Custom Fit Vehicle Wiring, item # 33465, does not have an extra ground wire. Both harnesses will work properly on your vehicle. I would select the Tow Ready Custom Fit Vehicle Wiring, item # 118389, because of the extra ground protection it offers. If there is a short circuit situation on the trailer the Tow Ready...
    view full answer...
  • Trailer Turn Signal Only Works when Brake Pedal is Pressed on 2004 Toyota RAV4
    If the lights on the trailer are working fine on another vehicle, then the issue is most likely with the RAV4 wiring harness, # 11839. To test it you will need a circuit tester such as # PTW2992. You will need to have someone sit in the RAV4 and run through the various light functions while you test with the circuit tester. I have included a link to a video showing how this is done. If you have the same or a similar problem when testing, then the issue could either be inside the converter...
    view full answer...
  • What Trailer Connector Is Needed After Installing T-One Harness On 2003 Toyota RAV4
    There are several things we will need to know in order to give you a good recommendation. What does the connector look like on the trailer you are planning on towing. From the research I have found that the RAV4 has a maximum towing capacity of 1,500 lbs. If your trailer has a 4-way connector on it, you should be able to just hook the trailer to the new harness on your Toyota. If your trailer has a wire harness that is different from the 4-way connector you have on your T-One harness,...
    view full answer...
  • Best Receiver Hitch Recommendation for a 2005 Toyota RAV4
    The hitch you would want for your 2005 Toyota Rav4 would be the Curt Hitch part # C13524 which is a confirmed fit. I attached an install video for this hitch for you to check out as well. For trailer wiring you would want the part # 118389. For ball mounts I recommend the etrailer Ball Mount Kit # 989900. It comes with 2 ball mounts, 2 balls, a hitch pin with clip, and a carrying bag.
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  • Parts Needed to Tow a Jon Boat Trailer with a 2003 Toyota RAV4
    The Curt hitch # C13524 that you have referenced is a good choice. It has more than enough capacity to safely tow the boat and trailer. However, before doing any towing you will want to consult the vehicle owners manual to determine what the vehicles towing capacities are and not exceed them. Even if the hitch is rated higher you still must go by the lowest rating. I also recommend etrailer ball mount kit # 989900. It comes with 2 ball mounts, 2 balls, a hitch pin with clip, and a storage...
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  • Trailer Wiring Harness for a 2001 to 2005 Toyota RAV4 with 4 Cylinder Motor
    Hopkins trailer wiring harness # 33465 fits all models of the 2001 to 2005 Toyota RAV4. That would include 4 and 6 cylinder models. You could also use # 118389 or # C55307. They all install the same way and have the same functions. I have included a link to a video showing an example installation.
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  • Max Tongue Weight on Curt Class I Trailer Hitch Receiver, # C13524, on 2004 Toyota Rav4
    On the Curt Trailer Hitch Receiver - Custom Fit - Class III - 2" # C13524, the maximum gross trailer weight is 4000 lbs. and the maximum tongue weight is 400 lbs. You would also need to use the Curt Towing Starter Kit for 2" Hitches - 2" Ball - 3/4" Rise, 2" Drop - 7.5K # C45534, on this trailer hitch receiver in the drop position only to meet the manufacturers recommendations. For wiring, you would need the Tow Ready Custom Fit Vehicle Wiring for the Toyota RAV4, 2004, # 118389. I am...
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  • Will Installation of Curt Class I Hitch # C13524 on 2003 Toyota RAV4 Interfere With Muffler
    If you have the factory muffler on your 2003 Toyota RAV4, it should not interfere with the hitch installation of Curt Trailer Hitch Receiver - Custom Fit - Class III - 2" # C13524. The hitch will bolt up to the vehicles frame with two bolts on each side and end up being positioned right alongside the muffler with the hitch being closer to the rear of the vehicle. I am including a link to a video of this Curt Hitch, part # C13524, being installed on a 2001 Toyota RAV4. The video will show...
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  • Trailer Hitch and Wiring for a 2005 Toyota RAV4
    The hitches for the 2005 Toyota RAV4 are a completely different design than those that fit 2006 and newer models. This is because of design changes on the vehicle. A hitch from a 2006 or newer would physically not fit a 2005. Even if you were to move a hitch from one vehicle to another you would still need to replace the mounting hardware because it was designed to be torqued down just once. The equivalent Curt hitch that will fit your 2005 RAV4 is # C13524. If you plan on doing some towing...
    view full answer...
  • What Size Bolts are Used to Install a Curt Trailer Hitch on a 2003 Toyota Rav4
    The size of the bolts that will hold this Curt Hitch # C13524 to the frame of your 2003 Toyota Rav4 will be M12 - 1.25 x 50 HEX BOLT. I attached installation instructions for this product for you to check out also. To complete your towing setup you may be interested in purchasing the following: Tow Ready Custom Fit Vehicle Wiring # 118389 (instructions and installation video) Sportframe Drawbar # 3593 Hitch Ball # 19256 Pin and Clip # PC2
    view full answer...
  • Trailer Hitch, Ball Mount, Ball, Locking Hitch Pin, and Trailer Wiring for a 2004 Toyota RAV4
    For your 2004 Toyota RAV4, I recommend the Curt Trailer Hitch, # C13524. This is a Class III trailer hitch that has a 2 inch receiver opening. A Class III hitch is rated for higher capacity, in this case 400 pounds tongue weight capacity and 4,000 pounds gross trailer weight, than the other available Class I hitches. Even if you never plan on towing that much weight, you will have a stronger hitch with a 2 inch receiver opening that will accept more accessories than a Class I, 1-1/4 inch...
    view full answer...
  • Should 4-Pole Wiring Harness Be Kept Inside Vehicle When Not in Use
    Unless you tow almost every day I recommend keeping your 4-pole trailer connector inside the vehicle where it is protected from corrosion and damage. Many wiring issues can arise from corrosion and so it is best to save yourself that potential hassle by keeping the harness out of harm's way as much as possible. The various harnesses for your RAV4, Curt harness # C55307, Tekonsha # 118389 and Hopkins # 33465, all have a protective cover for their 4-pole plug, but I still recommend keeping...
    view full answer...
  • Wiring 2005 RAV4 for Towing Jayco Camper with 6-Way Square Trailer Connector
    The 4 pole on your vehicle isn't capable of carrying an additional circuit to maintain your camper battery. Since the 6 pin square plug on your camper is pretty much obsolete, I'd recommend you remove it and replace it with a 7-way connector like # PK12706 and install a 7-way on the vehicle. A 7-way is much more common, which is why I'd recommend it. Keep in mind that the accessory circuit on the 7-way can maintain a trailer mounted battery, but will not be able to recharge it once it's...
    view full answer...
  • Recommended Trailer Hitch Receiver, Wiring Harness and Bike Rack for a 2003 Toyota RAV4
    The Curt Trailer Hitch Receiver # C13524 will not affect your ability to open or close the rear door on your 2003 Toyota RAV4. The receiver tube sits below the rear door so you will be able to still access your rear cargo. The T-One Vehicle Wiring Harness # 118389 will give you the 4-way flat connection you need for the lights on your 4' X 8' utility trailer. I recommend routing the connection out through the floor of your RAV4 and mounting it to your receiver using the Mounting Brackets...
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Do you have a question about this Custom Fit Vehicle Wiring?


Info for this part was:

Employee Zack K
Video Edited:
Zack K
Employee Michael H
Expert Research:
Michael H
Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
Updated by:
Alexander C
Employee Isabelle B
Updated by:
Isabelle B
Employee Cole B
Installed by:
Cole B

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