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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 # 118394
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Custom Fit Vehicle Wiring

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118394 - 4 Flat 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. Circuit-protected converter guards against shorts. Call 800-298-8924 to order Tekonsha custom fit vehicle wiring part number 118394 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 with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
  • All Info
  • Reviews (163)
  • Q & A (26)
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Tekonsha Custom Fit Vehicle Wiring - 118394

  • Custom Fit
  • Trailer Hitch Wiring
  • Tekonsha
  • 4 Flat
  • Converter

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 behind tail lights
    • 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 tail lights. You will have to remove the tail light assemblies to access this harness.


T-One Connection Location Points Behind Tail Lights

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.


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.



118394 Tow Ready T-1 T-Connector - 4 Wire

Installation Details 118394 Installation instructions

This Product Fits The Following Vehicles



California residents: click here



Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118394

Average Customer Rating:  4.9 out of 5 stars   (163 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.

- 118394
by:

Super fast service and shipping. Easy install and fitment was perfect. At a time when it is hard to find items in a brick and mortar store it is nice to be able to order and receive your items quickly and actually get what you needed. Thanks. Would definitely use etrailer again. 447159



- 118394
by:

Easy for the mechanic to install. 883071



- 118394
by:

Love this. It was easy to install and we’ve definitely gotten our money’s worth out if it 871487



- 118394
by: 08/15/2020

Easy to install and works fine. 862897



- 118394
by:
2006 Jeep Grand Cherokee

I haven't installed yet but the whole process of actually ordering and recieving was a breeze. Also the pictures of the employees who worked on the order is a nice touch...makes the whole process feel less robotic I guess. 862771



- 118394
by: 08/13/2020

works fine, no complaints. very happy with the purchase 861366



- 118394
by:

Easy install and no issues with it since installation. 818780



- 118394
by:
2005 Jeep Grand Cherokee

I'm wery happy,find good company like your,the delivery me products fast,with no problems,if every company work like you,be lot happy customer like me ,and for the I'm thank you so much. Me order ben delivery perfect with no problem,and in again order from you ,because I trust you you keep promise. Thank you so much. 814959



- 118394
by:
2005 Jeep Grand Cherokee

I'm wery happy,find good company like your,the delivery me products fast,with no problems,if every company work like you,be lot happy customer like me ,and for the I'm thank you so much. Me order ben delivery perfect with no problem,and in again order from you ,because I trust you you keep promise. Thank you so much. 814958



- 118394
by:

Great products and easy to install 807919



- 118394
by:

Great product easy to install ,works great . Never had a problem. Thanks. 778252



- 118394
by:
2006 Jeep Grand Cherokee

Product delivered as advertized in 2 da ys. 773956



- 118394
by:

Easy installation Fit as designed. 760714



- 118394
by:

Great product works perfect!!! No complaints here highly recommend product. 749964



- 118394
by:

Install was easy.Video and instructions easy to follow.Great service,thanks 722290



- 118394
by:
2005 Jeep Grand Cherokee

The Tekonsha T-one wiring harness kit fit exactly as advertised, works exceptionally well, is exceptionally well made and included everything I needed for my 2005 Jeep Grand Cherokee. Took less than an hour to install (because I'm slow) by following the very clear instructions. Fully compatible connectors and color coding of wires made it easy. Recommend this kit to anyone looking for a high quality tailored kit. Stay Safe! 717684



- 118394
by:
2012 Jeep Grand Cherokee

Ordered a hitch and wiring harness for my 2006 Grand Cherokee Wednesday about 4 pm and it arrived today (Friday) about 12 or so. Spent maybe an hour installing the hitch and wiring the harness total! Backed up to my boat trailer and it was plug and play! 110% satisfied!!! Dawn Wood- Charlottesville, Va 713599



- 118394
by:

It’s been a whole year since I installed this hitch from etrailer and although I don’t use it that often, it still looks and works great! Also saved about [price] by installing this product instead of the dealer hitch. Install was easy due to the great instructions that came with it. Keep up the good work etrailer! 697177



- 118394
by:

Thanks for all the other reviews on this product. I felt confident buying it, and I wasn’t disappointed. Got it with the wiring harness and install was super simple. Took 30 min, tops. The inclusion of the plastic bumper clips was stellar. I didn’t have to worry about breaking the old ones. Thanks for the great product and service etrailer. 682172



- 118394
by:
2005 Jeep Grand Cherokee

Great quality. Timely delivery. Excellent fit. Easy installation 669969



- 118394
by:

Easy to install, a year later and they still work great. 647463



- 118394
by:

Thank you very much it works very well I hope it up tonight again thank you 577611



- 118394
by:

Nice, complete set of wires. Shipped on time and arrived quickly. Semi-easy install. Seems to be working just fine. Thanks e-trailer. Highly recommended prouduct. 575262



- 118394
by:
Jeep

Easiest thing to install on my jeep so far. Love it, works great! Simple plug and play! 562078


Comments
Still works and do not regret my order
Fallon r - 09/06/2019

60886

- 118394
by:
2005 Jeep Grand Cherokee

Good instructions and very fast install !! 560901


26
166
Show More Reviews

Ask the Experts about this Tekonsha Custom Fit Vehicle Wiring

  • How to Troubleshoot OEM 7 Way Trailer Wiring on Jeep Grand Cherokee
    I'm sorry to hear that your having issues with your trailer wiring, but I am more than happy to help track down the issue. Since you checked the relays and fuses and I assume they are all good, there is something else going on. I recommend that you do a basic run through of all the connections, and make sure they are solid, check the fuses and relays again. You can use a tester like # 40376 to run through all the functions, and check each pin at the connector. If you are still not getting...
    view full answer...
  • Trailer Wiring Recommendation for a 2005 Jeep Grand Cherokee
    The CURT T-Connector Wiring Kit # 55381 that you referenced is designed for vehicles with towing packages already installed. For something that would install onto the tail light harness of your 2005 Jeep Grand Cherokee you would want a Tow Ready Custom Fit Vehicle Wiring # 118394 that you referenced. I attached installation instructions and a review video for this product for you to check out also.
    view full answer...
  • Parts Needed to Install a 7-Way Trailer Connector on 2006 Jeep Grand Cherokee Limited
    If your 2006 Jeep Grand Cherokee Limited did not have a factory trailer package you'll need to start off with a basic 4-pole wiring harness and then add the 7-way. Once you have a 7-way installed this connector will be able to carry trailer brake, tail and turn light functions as well as carry 12V auxiliary power, trailer brake power and reverse light signals - once those additional connections are made. The 4-pole harness I suggest for your vehicle is the Tow Ready # 118394 which is...
    view full answer...
  • Availability of a Plug and Play Trailer Wiring Harness for a 2005 to 2006 Jeep Grand Cherokee
    The T-One Vehicle Wiring Harness with 4-Pole Trailer Connector, # 118394, for the Jeep Grand Cherokee should not require the vehicle computer or the converter itself to be flashed or reset. This harness plugs in line with the vehicle tail lights so there is no cutting or splicing wires, so it is what can be considered as a plug and play harness. I have included a link to the installation details and a video showing a typical installation for you to view.
    view full answer...
  • High-Efficiency LED Lights for Pop-Up Camper to Reduce Power Draw on Vehicle Wiring
    Your pop-up camper is not likely to have so many lights on it that it poses an overload risk to a wiring harness such as Tekonsha # 118394. This harness outputs a maximum of 2.1-amps to each stop/turn circuit, but more important for your concern is that on the running light circuit it can deliver up to 5-amps. Unless you have installed lots of additional lights on the camper you should be fine. However, you can reduce the camper's power demands, and also improve its visibility, by replacing...
    view full answer...
  • Load Resistor Recommendation for a Vehicle with LED Lights and Hyperflashing
    The hyperflashing you are experiencing is most likely related to the LED lights you have installed on your vehicle. LEDs are notorious for causing hyperflash when used on turn signal circuits of a vehicle. Typically installing load resistors on the circuit like the part # P230004A-2 will fix the problem. To see how they install check out the picture I attached.
    view full answer...
  • Troubleshooting Pop-Up Camper Wiring That Blows Brake Lamp Fuse
    Somewhere in the trailer wiring, there's a short circuit that's causing the fuse to be blown. Closely examine the trailer connector on the vehicle and on the trailer, making sure there's not any corrosion or damage. Since it's the brake lamp fuse, you can concentrate on the yellow and green wires on the trailer, which carry the left turn/brake lamp and right turn/brake lamp. Trace the wiring back to the taillight assemblies. All it'll take is one little nick in the wire to allow the copper...
    view full answer...
  • Parts Needed to Install a 7-Way on a 2005 Jeep Grand Cherokee
    Thanks! Glad you like our install video! To install a 7-way on your 2005 Jeep Grand Cherokee you would want to first start with the # 118394 that you referenced. I attached the install video you referenced. Now if the trailer you plan to tow does not have brakes all you would need is # 37185. Otherwise from there you would need to convert the 4-way to a 7-way so that you can install the brake controller. For that you will want the Brake Controller Install Kit and 7-Way Adapter part...
    view full answer...
  • 4-Way Recommendation for 2005 Jeep Grand Cherokee for Light Bar
    Sounds like you are in need of a 4-way trailer wiring harness on your 2005 Jeep Grand Cherokee. For that you would want to use the Tekonsha kit part # 118394 which is a confirmed fit. Now if you want to tap into the reverse light circuit you will need to find that circuit on your vehicle by testing the wires that run into the reverse lights with a circuit tester like part # 3808. The wire that sees voltage when the vehicle is put in reverse is the one to attach to the white wire of your...
    view full answer...
  • Troubleshooting a Malfunction T-One Harness on a 2005 Jeep Grand Cherokee
    It is possible with a bad ground to get some signal. If it was not grounded at all, then you would get nothing, but a loose, or corroded ground connection could result in intermittent or irregular function. Make sure there is no corrosion built up around the ground. Make sure it has good metal to metal contact. Even a bit of paint can insulate the connection. If the ground is clean and has good metal to metal contact, then you will need to determine if the problem is the converter or...
    view full answer...
  • Two Aftermarket Trailer Wiring Harness Stop Working After 3 Years
    Some people do go through trailer wiring harnesses often. It has a lot to do with the trailer side wiring as much as it does the elements and environment. A new trailer or trailer with new wiring in a dry climate would likely have less issues so it would not negatively impact the trailer wiring harness. I have included a couple of links that explain and show how to test the trailer side wiring. You will want to make sure the wiring on the trailer is in good shape with no pinched or frayed...
    view full answer...
  • Availability of 5-Pole Trailer Wiring Harness for 1991 Jeep Cherokee
    We do offer a 4-pole wiring harness for a 1991 Jeep Cherokee, Tekonsha # 119178KIT, which you can convert to a 5-pole. No 5-pole versions are offered. But we do have a wiring adapter to convert a 4-pole to a 5-pole, part # 20036 from Tow Ready. Installation is simple: plug in the adapter to the 4-pole and then splice the blue wire into the reverse light wire on the vehicle. A quick-splice connector is included.
    view full answer...
  • Will Installing a Trailer Wiring Harness Affect Alarm System on a 2005 Jeep Grand Cherokee
    Installing Tow Ready trailer wiring harness # 118394 on your 2005 Jeep Grand Cherokee should not have any effect on the factory alarm. I have not yet heard of a wiring harness for any vehicle, including Jeeps, causing any issue with factory or even aftermarket alarms.
    view full answer...
  • Installation of Trailer Wiring Harness and Other Parts for Towing with a 2005 Jeep Grand Cherokee
    The wiring harness # 118381 plugs into a connector that is behind the rear bumper. However, it is not confirmed to fit your Jeep since you don't have the factory tow package. On your 2005 Jeep Grand Cherokee you need # 118394 which plugs in on both sides behind each tail light. I've linked an installation video for you to take a look at. Also, if you don't already have a trailer hitch receiver I recommend the Draw-Tite # 75338. It installs using 4 bolts. I've also linked this installation...
    view full answer...
  • Trailer Hitch and Wiring Recommendation for a 2005 Jeep Grand Cherokee
    The most popular hitch we offer for your 2005 Jeep Grand Cherokee is the Curt Hitch part # 13251. When this hitch is installed it will sit just below the cut out of your bumper. I attached an install video for this hitch for you to check out as well. If you wanted to do some towing you might be interested in etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with a 3/4 inch rise or 2 inch drop and one with a 2-3/4 inch rise or 4 inch drop. It also includes a 1-7/8 inch...
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  • How To Determine if a 2006 Jeep Grand Cherokee has a 7-Way
    If you look at the back of your 2006 Jeep Grand Cherokee and see a wiring connector that looks like the Tow Ready Wiring harness part # 20135 then you have a 7-way. Another option you could have is a 4-way which would look like part # 18172, or you might not have any connector at all. To add a 4-way you would first want the Tow Ready Wiring harness part # 118394. If you needed to upgrade to a 7-way you would need the 4-Way to 7-Way adapter part # 37185 after installing the #118394. For...
    view full answer...
  • Trailer Wiring Harness Recommendation for a 2005 Jeep Grand Cherokee 3.7L V6
    The first wiring harness that will need to be installed on your 2005 Jeep Grand Cherokee 3.7L V6 is the Tow Ready T-One Wiring Harness, # 118394. This wiring harness will tee into the Jeeps tail light wiring directly behind the tail light assemblies. I have attached the installation instructions as well as an installation video on a 2005 Jeep Grand Cherokee for you to check out. If the trailer has a 7-way blade style connector, then I would recommend using the Installation Kit, # ETBC7....
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  • Trailer Wiring Harness for a 2005 Jeep Grand Cherokee Laredo
    The Hopkins wiring harness # HM48895 is a universal type of harness but it is not one that is recommended for a 2005 Jeep Grand Cherokee Laredo. I have included a link to all of the wiring harnesses that are recommended for your vehicle. If your vehicle did not come with the factory 7-Way wiring harness then I recommend wiring harness # 118394. This is a plug and play style harness that connects in line with the vehicle tail light wiring. I have linked a video showing how it installs. With...
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  • Will The Tekonsha Prodigy RF Brake Controller # 90250 Work With Electric Trailer Brakes
    The Tekonsha Prodigy RF Brake Controller - Proportional - Trailer Mounted, part # 90250, will work on trailers with electric brakes. This brake controller will mount on your trailer and will plug into a 7-way connector on your 2005 Jeep Grand Cherokee. It will operate by a wireless remote that will plug into your 12 volt DC outlet on your tow vehicle. This Prodigy RF brake controller is designed for a trailer that will be towed by different vehicles, like fleet owners. I am including a...
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  • Installing Curt # C56175 Trailer Wiring Harness on 2006 Jeep Cherokee
    Because there are some plug-and-play options available like the # 118394, we don't have any footage of the Curt # C56175 being installed on a 2006 Grand Cherokee. To install the C56175, you would need to access the wiring harnesses that feed the drivers and passenger side taillight assemblies. Use a circuit tester like part # 40376 on the wires feeding the taillight as each function is activated, one by one. Start by activating the left turn signal. Probe the wires feeding the left turn...
    view full answer...
  • Aftermarket Trailer Wiring for 2005 Jeep Grand Cherokee to Bypass Factory Wiring
    Bypassing factory trailer wiring typically is a great way to avoid dealing with the headache of troubleshooting bad factory trailer wiring. So for your 2005 Jeep Grand Cherokee the easiest solution will be the Tekonsha Kit part # 118394 which installs by plugging inline with the vehicle taillight connectors to give you a 4-way. I attached an install video for this kit for you to check out as well.
    view full answer...
  • Will a T-One Vehicle Wiring Harness fit Into a 2005 Jeep Grand Cherokee?
    The T-One Vehicle Wiring Harness, # 118394, will fit a 2005 Jeep Grand Cherokee if it does not have the factory tow package, and because your hitch is not factory, is is likely you do not have that package. If it turns out you do have the factory tow package, you would need the Vehicle Wiring Harness with 4-Pole Flat Trailer Connector, # 118381 I have added links to video reviews and an install video for you to take a look at.
    view full answer...
  • Will Malone XtraLight Trailer MPG525G Work with Pelican Bass Raider Bass Boat
    The Malone XtraLight Trailer # MPG525G is perfect for a lightweight plastic bass boat like the Pelican Bass Raider and Sun Dolphins which are well below the trailer's 400-lb weight capacity. This means you'll have plenty of carrying capacity for other items like your trolling motor and other gear. The XtraLight's 47-inch bar spacing will provide stable support under the hull and since many of these boats are only about 4-feet wide the 58-inch bars will give you space for your rods, paddles...
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  • Recommended Trailer Hitch And Trailer Wiring For 2005 Jeep Grand Cherokee
    The first item I recommend is the Draw-Tite Trailer Hitch, part # 75338. This is a Class lll hitch and it has a 2 inch receiver opening. If you plan on doing some towing you might be interested in etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with a 3/4 inch rise or 2 inch drop and one with a 2-3/4 inch rise or 4 inch drop. It also includes a 1-7/8 inch ball, 2 inch ball, hitch pin with clip, and a storage bag. For a trailer that size many do not have brakes...
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  • Recommended Parts to Install 6-Pole Round Trailer Socket on 2006 Jeep Grand Cherokee
    To have a 6-pole round-pin type trailer socket on your 2006 Jeep Grand Cherokee I suggest our complete kit # ETBC6. This kit includes a 6-pole socket and all of the other components needed to have a working 6-pole trailer socket on your Grand Cherokee. Since I do not know what type of 6-pole socket you have it is best to stick with the complete kit to ensure everything will fit together properly. I have linked an installation video for our similar # ETBC7 (7-way) kit that will show you...
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  • 4-Way and 7-Way Trailer Wiring Recommendation for a 2005 Jeep Grand Cherokee
    For trailer wiring you will need to start with the 4-way part # 118394 that you referenced. Now if your trailer does not have brakes all you would need is the part # 37185 as an adapter to convert the 4-way to a 7-way. If you do have trailer brakes you would need the # ETBC7 instead of the # 37185 and a brake controller. This kit comes with everything needed to wire up the 7-way and install a brake controller. For a brake controller I would recommend the Prodigy P2 Brake Controller...
    view full answer...

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Info for this part was:

Expert Research:
Mike L
Expert Research:
Patrick B
Expert Research:
Michael H
Expert Research:
Jameson C
Expert Research:
Adam R
Video Edited:
Zack K
Video by:
Joshua S
Test Fit:
Nicholas E
Updated by:
Laura H
Updated by:
Sarah W
Updated by:
Alexander C
Updated by:
Isabelle B
Installed by:
Cole B

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