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  1. Custom Fit Vehicle Wiring
  2. Chevrolet
  3. Tahoe
  4. 2018
  5. Tekonsha
FITS 2018 Chevrolet Tahoe
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

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

Item # 118384
Our Price: $41.88
You Save: 19%
Custom Fit Vehicle Wiring
Confirmed to Fit
2018 Chevrolet Tahoe

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Tekonsha Custom Fit Vehicle Wiring - 118384
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The best technical support and full custom fit vehicle wiring installation instructions. Great price Tahoe custom fit vehicle wiring and expert service. Chevrolet Tahoe, 2018 custom fit vehicle wiring by Tekonsha are available from For expert service call 1-800-940-8924 to order your T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part number 118384, or order online at
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  • Reviews (443)
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2018 Chevrolet Tahoe - T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

  • Trailer Hitch Wiring
  • 4 Flat
  • No Converter
  • Tekonsha

Quickly and easily install a 4-way trailer connector on your Chevrolet Tahoe. This T-One typically plugs directly into the back of your factory-installed 7-way connector so you can retain the 7-way and also pull a trailer that has a 4-pole flat.


  • Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights
    • Retains functionality of factory-installed 7-way, RV-style connector (if present)
  • Connects quickly and easily - no cutting or splicing of wires
    • Locate connection points behind rear bumper
    • 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 behind the rear bumper. If you have a factory-installed 7-way, blade-style connector, the T-One will plug in between the 7-way and the OEM socket.

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.

118384 Tow Ready T-1 T-Connector - 4 Wire

Installation Details 118384 Installation instructions

California residents: click here

Customer Satisfaction Score:

Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118384

Average Customer Rating:  4.8 out of 5 stars   (443 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle. This T-One typically plugs directly into the back of your factory-installed 7-way connector so you can retain the 7-way and also pull a trailer that has a 4-pole flat.

GMC Sierra

Perfect fit for 2022 Sierra GMC . This leaves your 4 pin vacant to plug in your boat trailer etc

2013 GMC Sierra

Have been looking for a T-connector for my trailer lights for two years. Truck has a seven pin connector built-in. Wanted my GMC emblem to light up when the breaks are applied. Was getting ready to cut and splice wires when I looked on the internet and learned about Found the T-connector I needed. Took 5 days to arrive after ordering, and 5 minutes to install. Works great !


Slow start to a good impression but everything worked out.
1. It started with a delivery delay; I live two hours from the manufacturer but it took 3 weeks to get me my harness. When the error was found they over-nighted the harness to me.
2. The wiring in the harness was loose and would lose connection, disabling the lights. Pushing a connector back in to place, crimping it down and wrapping it in electrical tape solved that issue.
That was a month into owning the harness. It's been a year now and I've had no problems. I'm pleased with the compatibility and ease of which it took to install.

Don M.


The harness has held up great. Needed no adjustments after original installation.


Exactly as described, wires in nicely, has been working flawlessly since the installation!

2014 Jeep Grand Cherokee

Fit just like it should, engages securely and performs correctly. Nothing else I can ask for

2016 Jeep Grand Cherokee

Purchased this hitch for my new 2016 Jeep Grand Cherokee Laredo online after being quoted a $700 installation price at my local Chrysler Dealership. After doing some online searching and reading multiple reviews I decided to give these folks a try. My husband and I watched a very detailed video explaining 3 different hitch options for my Jeep and quickly decided for the price it was worth giving it a try. From opening box to install was less than 20 minutes that included connecting trailer light kit that I purchased extra $$.$$. You can barely see it under my JEEP. I'm very pleased and can't hardly wait to use it. Thanks again you helped me prove my to my husband that it would work and saved me $600!

2016 Jeep Grand Cherokee

I purchased a trailer hitch (C13182) and wiring adaptor (T-One 118384) for my 2016 Grand Cherokee. Received it within a few days and fit was perfect! Only took all of ten minutes to install with the help of my 5 year old. Thank You!


World class customer service

2014 Jeep Grand Cherokee

Bought a trailer hitch, and wiring harness for my 2014 Jeep Grand Cherokee. etrailer was fantastic, right on the money with the videos and it was very helpful in choosing the right hitch. Very easy to install.


Product was great plug-in play

2012 Toyota Tundra

I have a 2012 Toyota Tundra and I recently bought a pre-owned Leer camper shell. I used this harness to wire up the third brake light. I also used the brake light module. This setup worked perfectly and resulted in a neat and clean professional installation. Thanks etrailer, you had everything I needed for a successful prefect installation.

Ron G.


I installed this unit on my truck one year ago. It was perfect then and it is still working perfectly without issue.


Website very easy to operate and fubd exactly the right part to fit my truck/trailer !!! Videos were very helpful even telling me what sockets and wrenches I needed to complete install by myself and Im a carpenter not really mechanically gifted. Will definitely use again without hesitation!!


Easy to use web site - got the correct part - I have already ordered more parts - this time for my trailer!!! I will always choose etrailer for my parts



It was so easy to install and I have not had any issues with it. Best add on I ever added!!!


Always worked for me when purchased in the past so I didn't expect anything less this time.

Reginald W.


Ive had no problem with this item even thru a harsh winter use. Just make sure you use a little diox grease on the electrical pins so moisture doesnt ruin the contact

Etrailer Expert

Mike L.


@ReginaldW Good advice, dielectric grease like # 11755 does a great job of keeping moisture out of your electrical connections.




great trailer hitch at fair price.


Fit perfectly, and the [online] video was very helpful


Installed myself in about 30 minutes. 06 Silverado crew cab. Fit right up to factory fitting that was hidden up on top of the spare tire.


Works perfectly

2022 Ram 1500

OEM quality, plugged right in as advertised. My second purchase of a harness of this type from etrailer for a new vehicle, and will do so again.

2015 Jeep Grand Cherokee

Super easy installation and the addition of the 7 pin means that it is upgradeable. Perfect for me.

2014 Jeep Grand Cherokee

It is so easy-to-install


Keep up the good work, thanks.


Excellent product and easy to install! Finished up the installation with products 118144 and 118140 for a clean looking install.

GMC Sierra

As easy as it gets to add light power at the hitch. Perfect fit into the OEM connector behind the bumper on my GMC Sierra.

Show More Reviews

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

  • Reason for Blown 12V Trailer Connector Fuse on 2014 Ram Truck
    Usually a blown fuse is caused by some kind of short from a damaged or exposed piece of wiring. If the 12V fuse on your truck is blown, I recommend tracing the wiring going to the 12V pin on your 7-Way (1 o'clock position) and checking for any exposed areas that might be making contact with bare metal or another wire. Also inspect the 7-Way itself for any debris or corrosion that might be built up behind the pin. I took a look at the online owner's manual for your 2014 Ram and it looks...
    view full answer...
  • Why Would Interior Lights of Horse Trailer Not Function If Outlets Work
    It's probably a breaker that is tripped that controls the interior lighting. See if you can find the breaker box (should be near the battery) and then check to make sure all of the breakers are the right direction.
    view full answer...
  • Can 4-Pole Trailer Adapter, # 118384 Be Used at the Same Time as Another Connector, 2010 Dodge Ram
    The 4-Pole Trailer Adapter, # 118384, is a T-style connector. When plugged into a truck that has an existing factory trailer connector, that factory trailer connector will remain functional and you will be able to use either one. However, I advise against using more than one of the connectors at the same time. Doing so can overload the circuits and cause electrical damage. I have included a link to the installation details for this harness for you to view. The harness itself is rated...
    view full answer...
  • Adapter Recommendation for Adding 4-Way to Rear of 2017 Ford F-250
    Easiest way would be to wire in a 4-way with the kit part # 118384. This wires in line with the 7-way you have at the rear of your truck to give you an additional 4-way that you could use for your boat trailer as needed.
    view full answer...
  • Keep Blowing 20 Amp Running Light Fuse when Connecting Trailer to 2012 Ram 5500
    There is a short circuit somewhere that is causing the fuse to blow. A short would cause excessive power draw. Since it only happens when you plug in a trailer it is likely that the short is in the trailer connector or the wiring to it. You will need to make sure that there is no corrosion build up on the pins of the connector but also on the inside of the connector where the wires attach. Also check for any frayed or pinched wires touching metal and fix as needed.
    view full answer...
  • Trailer Wiring Harness Recommendations for a 2012 Jeep Liberty without a Tow Package
    Part # 118384 is designed for Jeep Liberties with a factory tow package. Without the factory tow package, not all functions will work. In order to make it function, you will need to head to your dealer and have them re-flash either the Body Control Module BCM or Power Control Module PCM to fully activate that port. Either way you would not need a relay.
    view full answer...
  • Troubleshooting Running Lights No Longer Working on Boat Trailer
    It sounds like there might be a weak or bad ground on the trailer wiring that maybe just took a couple of rides to fully present itself. The first thing I recommend doing is simply inspecting the 4- or 5-Way connector on the boat trailer. Look for any corrosion or debris inside the pins that needs to be cleaned out. Also inspect the wiring right behind it to make sure nothing is pinched and they are all fully secured to the connector. Next check the harness' main ground and make sure it's...
    view full answer...
  • Fuse Locations for 7-Way Connector on 2016 Ram 1500 Big Horn
    I took a look at the online version of the owner's manual for your 2016 Ram 1500. There should be a 30 amp pink fuse located in the F30 position inside the power distribution center. This fuse is specifically for the "Trailer Tow Receptacle". Make sure this fuse is present and in good condition. Additional fuse locations related to the 7-Way and trailer towing on your 2016 Ram are as follows: F11 (30 amp pink) - Integrated Trailer Brake Module F28 (20 amp blue) - Trailer Backup Lights F29...
    view full answer...
  • Troubleshooting Running lights on 4-Way Connector Not Working
    I recommend first checking the fuse box in your engine bay and checking your trailer park lamps fuse to ensure it is not blown or missing. If the fuse is there and working correctly I recommend unplugging the wiring harness from the back of your new dual 7-Way and 4-Way connector and verify that none of the contacts inside of the dual connector are damaged causing power to not be transferred through the plug. While there, ensure all wires are tight in the connector and do not have any...
    view full answer...
  • Video For Removing 7-Way Connector of 2011 Toyota Tacoma To Install T-One 4-Way Adapter
    If you fast forward to the 7:33 mark of the attached install video you can see exactly where to squeeze to remove the current 7-way connector to split it and install the T-One 4-way adapter part # 118384.
    view full answer...
  • 4-Way Recommendation for a 2012 Nissan Titan with 7-Way
    The T-One Vehicle Wiring Harness # 118384 that you referenced would be the correct product for your 2012 Nissan Titan with a 7-way to also install a 4-way. It will plug inline with the 7-way harness you have on your vehicle.
    view full answer...
  • Grounding Problem on RV Towed by 2004 GMC Sierra
    The fact that everything pretty much works fine until the headlights are switched on tells the story. What you are experiencing is the classic symptoms of an insufficient ground connection. When the headlights are switched on, the wiring system of the trailer is drawing full amperage, which is when a problem will manifest itself. Make sure that the ground connection on the RV is securely connected to clean metal on the trailer frame. You can find this connection by tracing the white...
    view full answer...
  • Trailer Brake Controller Fuse Location on 2014 Ram 2500
    I took a look at the online version of your 2014 Ram 2500 owner's manual. It looks like there should be a 30 amp pink fuse located in the F11 position inside the power distribution box (under the hood). This particular fuse is for the integrated trailer brake module on the truck. Make sure this fuse is present and in good condition. If the fuse is good or replacing it doesn't resolve the issue, please let me know and we can continue to troubleshoot.
    view full answer...
  • No Power on Tail or Brake Light Pin of Part # 118384
    If you are using the # 118384, and are not getting any signal on the connector for the brake or the tail light, you most likely have blown or missing tow package fuses. These fuses are typically located in a fuse box under the hood, but their location can vary according to the year, make and model of your truck. Your owners manual should have a fuse diagram showing which fuses protect which circuits, as well as the location of the fuses.
    view full answer...
  • 12 Volt Power All the Time On Brake Output Circuit with Curt Brake Controller on 1999 Olds Bravada
    There should not be power on the brake output wire unless the brake controller is sending back power. It sounds like something might be miswired at the 7-Way. Take a look at the picture I have included that shows the pin out of a vehicle side 7-Way trailer connector to make sure yours is wired the same way. If it isn't then put the wires in the appropriate places. Also check to see if any of the wires are touching each other inside the 7-Way. And if the 7-Way is dirty or corroded that...
    view full answer...
    Image 1 for
  • Drivers Side Brake and Turn Signal Lights Not Working on a 2012 Ram 3500 4x4 Cummins Diesel
    When a light is only working periodically that is usually an indication of a weak ground connection or a loose wire. But on a newer truck like your 2012 Ram 3500 this does not seem likely. The trailer connector having power is not surprising. That means that the trailer wiring is independent of the truck lights. I would start at the front and work my way back. You could have something going on with the fuse and/or relay (if equipped) on that side. Use the truck owners manual to find all...
    view full answer...
  • Will the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector Fit a 2022 Ram 1500 TRX
    Yes, the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118384 will fit a 2022 Ram 1500 TRX.
    view full answer...
  • Right Side Trailer Lights Do Not Work on Trailer Towed by 2005 Nissan Titan
    Since the lights on the trailer are working fine on another truck that would mean the issue is on your 2005 Nissan Titan. It sounds like a bad ground. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light. Or they can happen as the result of corrosion or loose wiring. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside...
    view full answer...
  • Recommended Vehicle Wiring Harness With 4-Pole Flat Trailer Connector For 2017 GMC 1500 Denali
    On your 2017 GMC 1500, I recommend using the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector, # 118384, to add that 4 way connection. There will be a connection behind the bumper that will allow you to simply plug in this harness without cutting or splicing. It is a simple plug and play assembly. I've attached a video of this installation on a 2012 GMC Canyon, and your installation process on your Sierra will be the same.
    view full answer...
    Image 1 for
  • Trailer Lights Stop Working, Blow Fuses when Connected to a 2001 Dodge Ram 3500
    It sounds like 1 of 2 possible problems. First, there could be a short somewhere that is drawing excessive power and causing the fuses to blow. The easiest place to start checking is going to be the truck and trailer side connectors. Make sure each is clean and free of corrosion inside where the wires attach and on the pins. You can also check the wiring on the truck and trailer checking for any pinched, frayed, or damaged wires and fix as needed. The second possible cause is that if...
    view full answer...
  • Troubleshooting Service Brake Controller Message on Ram 3500
    Here's what I was able to find for error messages similar to what you listed for a Ram truck: SERVICE TRAILER BRAKE SYSTEM: This message will display when there is a problem with the ITBC system. If this message continues over multiple ignition cycles, there is a problem with the ITBC system. Have the vehicle serviced. First thing I would check though is for corrosion on the trailer wiring connector as that's the most common cause of brake controller issues. Clean the pins with sandpaper...
    view full answer...
    Image 1 for
  • Locating 12V Trailer Battery Fuse on 2016 Ram 2500
    Based on my research there should be a pink 30 amp fuse located at the F30 position inside the power distribution center under the hood of your 2016 Ram 2500. This fuse is connected to the 12V power circuit on the factory 7-Way so you will want to make sure this fuse is present and in good condition. Please just let me know if you still don't get power at this pin after replacing the fuse and I will be happy to look into this further.
    view full answer...
  • No Left or Right Trailer Stop/Turn Trailer Signals on a 2010 Chevy Silverado 2500
    If you have no trailer stop/turn signals, left or right on a 2010 Chevrolet Silverado 2500, you'll first want to start with taking a look in your owner's manuals for the correct fuse location. I went ahead and did this for you, the #1 fuse location is for the right trailer stop/turn and the #3 is for the left trailer stop/turn in the underhood fuse block. If the fuses are good the next step would be to inspect the terminals inside the trailer connector to be sure there is no corrosion....
    view full answer...
  • From End to End How Long is the Wire of the 4-Pole Trailer Adapter GM trucks 7 Way, part # 118384
    I went out into our warehouse and measured one of the 4-Pole Trailer Adapter for GM trucks with Factory 7 Way, part # 118384, that we had in stock and it measured 41 inches from the end of one connector to the end of the connector on the opposite side.
    view full answer...

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