bing tracking image
  1. Custom Fit Vehicle Wiring
  2. Ram
  3. 3500
  4. 2021
  5. Tekonsha
FITS 2021 Ram 3500
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

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

Item # 118384
Retail:$50.54
Our Price: $35.10
You Save: 31%
Custom Fit Vehicle Wiring
Confirmed to Fit
2021 Ram 3500

with factory 7-Way

Will this fit?

To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.

Shipping Weight: 0.73 lbs
Add to cart
In Stock
Tekonsha Custom Fit Vehicle Wiring - 118384
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Customer Photos

Need help with installation?
Locate installers near me
Call etrailer.com at 1-800-940-8924 for expert service. We are your Ram custom fit vehicle wiring experts, and offer a great price. etrailer.com carries a complete line of Tekonsha products for your Ram 3500 2021. T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part 118384 from Tekonsha can be ordered online at etrailer.com. Complete custom fit vehicle wiring installation instructions and technical support.
  • All Info
  • Reviews (446)
  • Q & A (0)
  • Photos

2021 Ram 3500 - T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

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

Quickly and easily install a 4-way trailer connector on your Infiniti QX56. 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.


Features:

  • Provides a 4-way flat trailer connector at the back of your Ram 3500 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


Specs:

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


Installation

This custom-fit T-One connector plugs into your Ram 3500'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 Ram 3500, 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   (446 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.

by:
2011 Chevrolet Silverado

I used this harness to add a tailgate strip light to my 3011 Silverado. The whole process including installing the light strip took 45 minutes. The harness plugged in in minutes and works beautifully.



by:
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 etrailer.com. Found the T-connector I needed. Took 5 days to arrive after ordering, and 5 minutes to install. Works great !



by:

Just what I needed .... perfect fit!!

Charlie N.

5/6/2024

Still working great ... use it everyday!



by:
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.

7/13/2023

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



by:
GMC Sierra

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



by:

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.

5/11/2023

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



by:

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



by:
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 etrailer.com you helped me prove my to my husband that it would work and saved me $600!



by:
2024 Ram 2500

Perfect fit.



by:

Search hi and low to find what I needed or even for someone who even understood what I needed. I had no luck until I search on etrailer.com. They had exactly what I was looking for. Ordering was simple and delivery was quick. They even check in with me before durning and after shipping. I love this site. I'll definitely shop here first next time.



by:
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!



by:
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.



by:
2014 Jeep Grand Cherokee

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



by:

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 etrailer.com again without hesitation!!



by:

TRAILER WIRING HARNESS WENT TOGETHER REAL GOOD. IT ONLY TOOK A VERY LITTLE TIME TO INSTALL. THIS MADE INSTALLING MY LED BRAKE LIGHT KIT VERY EASY.



by:

World class customer service



by:

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

Reginald W.

8/20/2023

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.

9/13/2023

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


by:

great trailer hitch at fair price.



by:

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



by:

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

Frank

1/30/2023

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



by:

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



by:

Works perfectly



by:

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.



by:
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.



by:
2015 Jeep Grand Cherokee

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


25
446
Show More Reviews

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

  • What do You Recommend to Transport a 24 x 48 260 Pound Object on a Flat-Towed 2014 Grand Cherokee?
    The only option we currently have that will give you the 24 x 48 inches of space you need as well as the safety, I recommend the GearSpace 34 Enclosed Cargo Carrier for 2" Hitch - Slide Out item # HGK819 (dark grey) or item # HGK826 (light grey). With the GearSpace 34, it has internal dimensions of 63" long x 28" wide x 40" tall. Also, the GearSpace 34 has been constructed to withstand the added torque and force when mounted on a hitch receiver on a flat-towed vehicle. Almost all of our...
    view full answer...
  • Troubleshooting Stoplight Circuit of 2011 Toyota Tacoma Trailer Wiring Not Functioning
    It does sound like the converter box has shorted out and you would need to replace it with the part # 118496 which is correct fit for your 2011 Toyota Tacoma. If the blinker circuits are still functioning on the trailer wiring but the brake light circuit is dead then that would indicate the circuit board isn't functioning properly and would need replaced.
    view full answer...
  • Troubleshooting 2008 Chevy Silverado 2500 Where 12 Volt Circuit on 7-Way isn't Active
    There are a couple connections you need to make under the hood of your 2008 Chevy 2500HD to allow the 12 volt accessory circuit of your 7-way to activate. If you check out the help article I attached and then scroll down to the section titled "Finalizing Connections for the Brake Controller" you'll see the entire process outline.
    view full answer...
  • 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...
  • 12V Fuse Location for 2017 Ram 3500
    I took a look at the online owner's manual for your 2017 Ram 3500. It looks like the fuse related to the 12V pin at the 7-Way should be located at the F30 position inside the power distribution center (in the engine compartment). This will be a 30 amp pink fuse. You will just want to make sure this fuse is present and in good condition. Other fuses on your Ram related to towing are as follows: F28 - Trailer Tow Backup Lights - 20 Amp Blue F29 - Trailer Tow Parking Lights - 20 Amp Blue F53...
    view full answer...
  • How to Add Second Wiring Harness to 2018 Toyota Tundra to Power Tailgate Light Bar
    If your 2018 Tundra has wiring that uses a round U.S. Car type connector (like the item shown in the linked photo) then you can easily piggyback a second wiring harness and have both remain active. Most tailgate light bars use a 4-pole flat connector so if this is what you have all you need is part # 118384 which will simply plug in between your 7-way socket and the U.S. Car connector that connects to the back of it. Please check out the linked install video. I strongly recommend using...
    view full answer...
    Image 1 for
  • Hitch Recommendation For a 2010 Dodge Ram 2500 Mega Cab With a Factory Installed Hitch
    You might want to check the hitch on your 2010 Dodge Ram 2500, but it is usually welded on to the frame of your vehicle. It would be very difficult to remove. I would recommend the Curt Class V 2 Inch Hitch, part # C15409. This hitch has 17000 lbs towing weight capacity and 2550 lbs tongue weight capacity. If you will be towing with the Curt hitch you will also need the Draw-Tite Ball Mount, part # 40331, the part # PC3 Pin and Clip, and the hitch ball. Depending on the coupler size...
    view full answer...
  • Can Rear Fascia Panel be Replaced After Installing Curt Trailer Hitch # 13424, 2011 Chevy Traverse
    You will notice in the instructions that I have linked for Curt Trailer Hitch, # 13424, that it states that the panel in question may be reinstalled on some models. So I spoke with my contact at Curt to determine if the 2011 Chevy Traverse was a model that it could be reinstalled on. He stated that they did not have information on the 2011 but on the 2010 it can be reinstalled. Basically, if the rear fascia is the same on the 2011, then it will fit. But if it has been redesigned, it will...
    view full answer...
  • Draw-Tite Trailer Hitch Receiver with Installation Hardware for a 2008 GMC Acadia
    The 2008 GMC Acadia Draw-Tite Max-Frame Trailer Hitch Receiver Class III - 2" # 75528 is a quality choice for your vehicle, and it comes with all the hardware you'll need for installation. If you plan on towing, you'll want to grab a wiring harness and ball mount set-up as well. Wiring harness for a vehicle without a tow package # 118451 Wiring harness with tow package # 118384 I recommend the etrailer Ball Mount Kit # 989900. It comes with 2 ball mounts, 2 balls, a hitch pin with clip,...
    view full answer...
  • Draw-Tite Hitch # 75362 Fit on 2000 GMC Sierra
    The Draw-Tite Class III Hitch # 75362 that you referenced is a correct fit for the 2000 GMC Sierra 1500 and 2500 LD truck with OEM bumper. The hitch installs without drilling using included hardware. The written instructions as well as an install video are linked for your review. If you have a different version of the Sierra please let me know and I will be glad to confirm a hitch fit. I have also included two articles concerning hitch installation that will be helpful to you. If you...
    view full answer...
  • Trailer Wiring Stopped Working After Turning On Hazard Lights on a 2006 Nissan Titan
    If everything was working but then stopped working as soon as you used the hazards then I think it is fuse or relay related. There could be a short issue of some kind that is not all that bad when just one blinker is working. But with both blinkers going on at the same time, the power draw increases and that could have caused a fuse or relay to fail. For relays you could use # C57000. But I would not replace anything until you have examined all of the wiring and checked for exposed wires...
    view full answer...
  • Troubleshooting 2014 Ram 3500 Trailer Brake Controller Not Sending Power To Trailer Brakes Suddenly
    I would be happy to help! First things first using a circuit tester like # PTW2993 test the 5 o'clock pin on your 2014 Ram 3500's 7-way connector while a friend applies the manual override to the controller. If you are getting power, there then this means the issues is between your trailers 7-way connector and the brake magnets. You will want to check all of this wiring for any damage and replaced damaged sections with # 10-1-1 and heat shrink butt connectors # DW05745-5. If you do NOT...
    view full answer...
  • Connecting 3rd Brake Light of Truck Camper Shell to 2013 GMC Sierra Wiring Harness
    For connecting your truck shell 3rd brake light on your 2013 GMC Sierra 1500 I recommend adding the Tekonsha T-One Vehicle Wiring Harness # 118384. This will allow you to be able to unplug the wiring that will go to your truck shell if you need to remove it from the truck. It will also not require you to splice into any of your vehicle wiring. To this you will need the Wesbar 4-Pole Flat Connector # W787268 to allow you wiring up to your 3rd brake light. You will then be able to wire...
    view full answer...
  • Troubleshooting Brake Controller Errors When Running Lights Or Hazard Lights Are Turned On
    Hey Michael, The first thing I'd check is the ground both on the truck's 7-way because a weak ground causes all kinds of goofy issues. I'd just splice into the back of the factory 7-way and run a 10 gauge wire # 10-1-1 to the vehicle frame with a ring terminal # 44-5356A and self-tapping screw. I'd also check that there's not bare or damaged wires touching each other behind the 7-way. From there I'd start to question that the brake controller is properly functioning. You've already...
    view full answer...
  • Part Needed to Add Second 4-Way to Rear of 2016 Ford F-150
    What you could use is the part # 118384. This 4-way will plug in line with the 7-way you have at the rear of your 2016 Ford F-150 and it will provide you with an additional 4-way at the rear of your truck.
    view full answer...
  • Is Under Car Trimming Required for Installation of Hitch # C13065 on a 2011 Dodge Grand Cherokee
    For installation of the Curt Trailer Hitch, # C13065, on your 2011 Jeep Grand Cherokee, you will need to trim excess caulk on vehicle frame rails, only if it interferes with hitch installation, see instructions link. I have added a photo showing where the excess caulk is likely to interfere and need to be trimmed. No part of the bumper or fascia will need to be trimmed. You may be interested in the following items to complete your trailer hitch setup. Trailer Wiring, # 118425 (without...
    view full answer...
    Image 1 for
  • Interior Lights In Horse Trailer Not Working After New Tow Vehicle
    If the only thing that has changed on your trailer is that it is now being pulled by a different vehicle then that is most likely where the issue resides. Generally speaking, the interior lights are powered by either a 12 volt battery on the trailer and is then charged by the 12 volt power circuit on the 7-way or they are just ran directly to the 12 volt power circuit on the 7-way. Therefore, the issue you are having is most likely that the 12 volt power circuit on the 7-way is not active...
    view full answer...
  • Availability of Plug-In 4-Pole Trailer Connector for 2000 Chevrolet Silverado
    If your 2000 Chevrolet Silverado has a factory 7-way trailer connector with a round U.S. Car connector at the back (please see photo) you can use part # 74682 to provide both 7-way and 4-pole connectors in one housing. If you prefer them to be separated then instead you can use harness # 118384 which will connect inline with the existing 7-way's connectors. Both connectors will be active at the same time. You also have the option of wiring in a totally separate universal 4-pole trailer...
    view full answer...
    Image 1 for
  • Running Light Circuit on Truck Side 4- and 7-Way Connectors Does Not have Power
    The flashers are on a different circuit than the running lights on a 7- or 4-Way. Brake lights and turn signals are combined on one circuit. The running lights do not share a circuit. So since there is no power on the running light circuit I suspect that it is a tow package fuse or relay that is blown or missing. Check the vehicle owners manual to find the locations of the tow package fuses and/or relays. If there is a blown fuse then you would want to determine where the short occurred...
    view full answer...
  • Adding a 7-Way Trailer Connector to a 2012 Dodge Ram 2500 Big Horn With Flatbed
    If your 2012 Dodge Ram 2500 came with a factory tow package that included a 7-Way at the back of the vehicle, you can use 5th wheel and gooseneck in-bed wiring harness, # 50-97-410. This harness plugs in line with the factory wiring harness under the truck and provides a 7-Way in the bed area. If the truck did not come with a factory tow package that included a trailer connector, you will have to hardwire one in starting with a 4-Way using # 119178KIT. A T-connector is not available. Once...
    view full answer...
  • Does Third Brake Module PP20-702 Fit 2020 Ram 1500
    Yes the third brake light module part # PP20-702 that you referenced does fit your 2020 Ram 1500. You'd want to wire this to the trailer wiring at the rear of the truck.
    view full answer...
  • Trailer Running Lights Not Working when Using a 7-Way to 4-Way Adapter
    I assume you meant 7-Way since there are no 8-pin connectors. The 7-Way to 4-Way adapters will have the pins in the standard locations for the trailer lights but no other pins will be present. Rather than changing the pin out on the adapter it would be easier to swap wires around on the vehicle side 7-Way connector to the positions you need. The 7-Way trailer connector can be opened up and the wires switched around. If your 7-Way cannot be opened then you will have to cut and splice the...
    view full answer...
  • Right Brake Light on 4-Pole Trailer Connector Not Working on 2004 GMC Sierra
    If your 2004 GMC Sierra uses a 4-pole flat trailer connector like the Tow Ready # 118384 that you referenced the right turn and right brake light signals both will be carried on the green wire. Please refer to the linked photo. The most common cause for one light function (the right turn light) to work while another carried on the same wire (the right brake light) does NOT work is a bad ground connection. Turn signals do not pull as much current as a brake light signal, since turn signals...
    view full answer...
    Image 1 for
  • Is The Tekonsha T-One # 118384 Compatible With The Brake Controller 9030A?
    The T-One Vehicle Wiring Harness # 118384 would not be compatible with the Tekonsha Brake controller you mentioned. The 118384 is a 4 flat wiring harness for trailer brake lights, tail lights and turn signals. So it does not include any kind of brake function. You would need to have a 7-way plug installed on your vehicle in order to use a brake controller. If you have a 7 way plug installed from the factory your can use part # 7894 to wire in your brake controller.
    view full answer...


< Previous
123. . .15



Do you have a question about this Custom Fit Vehicle Wiring?


Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Robert G
Expert Research:
Robert G
Employee Michael H
Expert Research:
Michael H
Employee Jeff D
Expert Research:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee John H
Expert Research:
John H
Employee Brandon M
Expert Research:
Brandon M
Employee Adam R
Expert Research:
Adam R
Employee Rachael H
Expert Research:
Rachael H
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Zack K
Video Edited:
Zack K
Employee Joshua S
Video Edited:
Joshua S
Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
Chris R
Employee John S
Video Edited:
John S
Employee Andrew K
Video by:
Andrew K
Employee Kathleen M
Video by:
Kathleen M
Employee Zach D
Video by:
Zach D
Employee Jonathan Y
Video by:
Jonathan Y
Employee Nicholas E
Test Fit:
Nicholas E
Employee Randy B
Test Fit:
Randy B
Employee Brent H
Test Fit:
Brent H
Employee Robert C
Test Fit:
Robert C
Employee Matthew B
Test Fit:
Matthew B
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 Ryan G
Installed by:
Ryan G

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.