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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 # 118800
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Custom Fit Vehicle Wiring

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Tekonsha Powered Converter Custom Fit Vehicle Wiring - 118800
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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. Powered ModuLite reduces strain on wiring system. 1-800-496-5010 to order Tekonsha custom fit vehicle wiring part number 118800 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.
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  • Reviews (19)
  • Q & A (0)
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  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118800

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • Powered 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. Powered ModuLite reduces strain on wiring system.


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
    • Locate connection points in rear cargo area
    • Plug in T-connector
  • Includes ModuLite to ensure that your vehicle's wiring matches that of your trailer
    • Powered module connects directly to battery to avoid overloading vehicle's electrical system
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


Specs:

  • Maximum amperage:
    • Stop/turn lights: 5 amps per circuit
    • Tail lights: 7.5 amps per circuit
  • 1-Year limited warranty


Installation

This custom-fit T-One connector plugs into your vehicle's wiring harness, which is located in the rear cargo area. You will have to remove the rear threshold plate, privacy screen, storage covers, and floor covering to access this harness. Several trim panel fasteners will need to be removed, along with the lower interior trim panels on the driver's side.


Once installation is complete, the 4-way flat connector will be stowed in your rear 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.


ModuLite Powered Tail Light Converter

A ModuLite power module 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. This power module functions as a tail light converter to combine 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.


With a ModuLite, your trailer's lights will be powered without overloading your vehicle's electrical system. Because the module draws power directly from your car's battery and bypasses the electrical routes that are used by a basic wiring harness, there is virtually no draw on your tail light circuits.



118800 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

Installation Details 118800 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 - 118800

Average Customer Rating:  4.5 out of 5 stars   (19 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. Powered ModuLite reduces strain on wiring system.

by:

Excellent product. I did find I ordered the wrong harness but did not know that until I read the instructions and accessed my connector plug on the car and found I needed the 118804 harness with 12v wire to the battery. Have delt with etrailer before and had excellent response from Vicki who sent me the correct harness on the same day. Thank you!


Comments
Excellent product
JohnBob - 06/18/2022


by:

In shipping product was all damage, scratched bent , never received the wiring harness.????


Comments
I will have our customer service team reach out to you.
-- Etrailer Expert Jenny N - 10/29/2021


by:
2022 Acura RDX

I don't think this is a truly vehicle specific wiring harness (read for more).

Harness was relatively easy to install after removing the floor panels, threshold scuff plate and pulling enough of driver side trim to access the factory harness. I used the grommet location in the center of the cargo pan near the bumper to run the wire to the hitch area under the car. I did have to cut the wires going to the 4 flat connector to fit through the hole in the metal - then cut slice in factory rubber grommet to push wire through and reconnected the 4 wires with butt splice connectors inside the cargo area.

Where I am confused, is instructions indicate this version only works with 2 red wires in the cars harness for the 12 volt power or you have to run a separate wire to the battery. While the 2022 advance only has 1 red wire in the cars harness, the Acura OEM wiring harness for this model does not require a 12 volt run to the battery, only connecting to the cars harness to a very similar controller box then to the 4pin flat harness with installing a 7.5a fuse in the open "small trailer" fuse position in the center under hood fuse panel.

With fuse installed, car harness has 12 volts on the red wire pin, it is just in the incorrect location compared to the 118800 harness. If factory OEM harness does not require separate 12volt power why isn't the power pin in this harness in the correct location matching the car harness?

A good youtube video from a professional hitch installer shows this approach.


Comments
While it may be possible to install it this way and have some power, I still recommend running that wire because otherwise you only have power coming from the lights. Down the line it is more than likely that you would run into issues with not having enough power.
-- Etrailer Expert Brooke M - 08/09/2022


by:

I have used these wiring harnesses from T-One through E-Trailer before so even though I have not yet installed this one I trust that it will be as good as the ones I have used before. Good product, fast shipping, great value.


Comments
Perfectly, no glitches just plug it into your trailer 4 pin connector and go.
Al - 08/28/2021


by:
2019 Acura RDX

As usual from etrailer. Arrived on time, I installed it and works perfect. Why go to the dealer? I'm taking my wife out with the money I saved.




by:
2019 Acura RDX

Rec'd my Tekonsha Custom fit trailer Wiring harness for my 2019 Acura RDX! Great price and the quality is the same as U-Haul harnesses. Big exception, my harness through etrailer.com cost me $33, at U-Haul it was $75, what a difference in price! Thank you etrailer, I will have it installed tomorrow, should fit perfectly, made specifically for my SUV. Perfect!!!


Comments
I have used my wiring harness during this past year. It has worked well every time I use it. I will always check with etrailer 1st before purchasing any accessory I might need. Excellent products!
Michael - 04/28/2021


by:

Easy install. Looks great. Great price.




by:
2020 Acura RDX

This is my second order from etrailer and the comments apply to both orders, class two hitches and electrical harnesses for a Subaru Forester XT and a 2020 Acura RDX. The hitches arrived promptly, well packaged with no damage. I could install them with minimal fuss. Hardest part was loosening the rubber exhaust hangers. Everything lined up and works fine. Haven't towed with the RDX yet, but towed a trailer with several motorcycles on the XT for a few hundred miles in MD and PA with no issues.

etrailer offers a great product, ships promptly, at a decent price. Will definitely continue to be a customer.




by:
Acura RDX

Items arrived ahead of time.
etrailer
got my order out the door
very quickly.
The amazing thing was that they had
the item in stock.
The 20 RDX required a new hitch
design.
Drawtite was the first out but NOBODY
could get one EXCEPT etrailer and I looked hard.
Without exception they are COURTEOUS and they deliver.
That is a well managed company full of motivated people.
Top to bottom.




by:
2019 Acura RDX

With minor modifications this 118800 harness worked as intended on my 2019 Acura RDX. Customer service was incredible helpful answering my questions and doing a follow up to verify I was satisfied. Thank you.




by:
2019 Acura RDX

Instructions could have been more detailed but all in all pretty good.




by:

etrailer was much easier to use than the big “A”. I was able to find the best products and advise. I’ll be back.


Comments
Working great after a year
Phil - 08/07/2020


by:




by:

Great price and quality. Installed on 2020 Acura RDX...some re & re involved which has nothing to do with product. Use recommended tools for panel removal. Acura buried the location to connect up to...??? If your tech savvy you’ll save big money over dealer install.




by:

Gave me support. Had the product. Competitive priced. Quick delivery




by:
2019 Acura RDX




by:

Good product but install time was way off. It took three hours to install.




by:




by:



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



  • Is Additional Fuse Needed to Install Tekonsha Trailer Wiring in 2019 Acura RDX
    Is it possible you didn't install the blue fuse that comes with the Tekonsha trailer wiring kit part # 118800 into the fuse holder that's on the power wire of the kit? Without this fuse installed no power would make it to the module. Worst case scenario if your vehicle does not have this circuit active you could route a wire from the vehicle's positive battery post to this wire and you'd have the harness active.
    view full answer...
  • Recommended Trailer Wiring Harness for a 2021 Acura RDX
    The trailer wiring harness I recommend for a 2021 Acura RDX is the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118800 which offers a plug and play install. It provides a 4-way flat connector which is the most common and widely used for trailers without brakes. There are a few panels inside you must remove then you can simply plug in the harness and drape the connector out the hatch when needed.
    view full answer...
  • Tekonsha Wiring Harness Doesn't Require a 12V to The Battery on a 2021 Acura RDX ASPEC
    The Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector item # 118800 you referenced does not require a fused connection to the battery. With the exception of the ground all of the connections are done with the plug in connecter for the T-One harness. I have linked the installation instructions and a review video.
    view full answer...
  • Will The Tekonsha 118800 Trailer Wiring Kit Work On A 2022 Acura RDX
    Great question. Yes, the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118800 will work with your 2022 Acura RDX with no problems.
    view full answer...
  • How to Determine Correct Trailer Wiring Harness for 2020 Acura RDX
    In order to determine the correct trailer wiring harness for your 2020 Acura RDX - the option for +12-Volt Power Provision or without - you can check out the 8-pin connector on the driver's side interior trim panel, like in the accompanying photo. To see how to access this you can take a look below at the linked installation instructions. Once you see the 8-pin connector, check to see the number of red wires going INTO the connector. - Two Red Wires - With +12-Volt Power Provision: T-One...
    view full answer...
    Image 1 for
  • Would Trailer Hitch and Wiring from 2017/2018 RDX Also Fit 2020 Acura RDX
    There is a big enough difference between the 2017/2018 Acura RDX models and the 2020 that they had to come out with a new hitch fit. So the 2020 would require the part # 76268 that you referenced and you would not be able to reuse the hitch from the older RDX. The same is true for the trailer wiring as well. You'd have to go with the # 118800 on the 2020 model and you'd be set.
    view full answer...
  • Why Does Tekonsha T-One Connector 118800 Not Match Wire Layout Of Connector In 2019 Acura RDX?
    Thanks for the pictures! Since the connector on your 2019 Acura RDX only has 1 red wire, your vehicle does not have the plus 12v power provision meaning the Tekonsha # 118800 is not the correct harness as it is designed for vehicles with the plus 12v power provision. Moving the wire on the connector is not recommended as it will void the warranty of the harness. Instead you will need to use the Tekonsha # 118804 which is the correct harness for your RDX without the plus 12v power provision. I...
    view full answer...
    Image 1 for Image 2 for
  • How to Determine Which 4-Way Trailer Wiring Harness Is Needed On a 2022 Acura RDX?
    To determine if your 2022 Acura RDX has the 12-Volt Power Provision you will need to access the 8-pin connector inside your Acura to see if it has 2 red wires in the factory side of the connector. This connector is located on the drivers side above the rear portion on the rear fender(see image). If you only have one wire you do not have the provision and will need the Tekonsha T-One Vehicle Wiring Harness # 118804. If your connector has 2 red wires you do have the provision and will...
    view full answer...
    Image 1 for
  • Trailer Hitch Solution for 2019 Acura RDX with 19 inch Spare Wheel/Tire
    I have a solution for you but none of the hitches we offer for your 2019 Acura RDX with Tech Package can be used with a 19 inch spare stored underneath the vehicle. So what your best option would be is replace the spare you have with a smaller one from Acura so that you can then install the Draw Tite hitch part # 76268. For trailer wiring you'd then want the Tekonsha kit part # 118800 and you'd be set with an easy to install trailer wiring harness setup that's also very reliable.
    view full answer...
  • Removing Plastic Tray in Rear of 2019 Acura RDX to Install Trailer Wiring
    When installing the Tekonsha trailer wiring harness part # 118800 in your 2019 Acura RDX the lower storage compartments you mentioned in the rear cargo area does just pull out. Once you get past that point though there are some panels you'll need to be careful removing and a trim panel removal tool like part # ALL648544 would be what you'd want.
    view full answer...
  • Trailer Wiring Solution for 2019 Acura RDX without 12 Volt Power Provision
    We have trailer wiring kits that fit your 2019 Acura RDX that does not have the 12 volt power provision but they are universal style kits like the # 119250KIT and not the custom install kit that you referenced. That said, the ZCI uses sensors to tap into the vehicle wiring instead of splices so the install is not invasive and still relatively easy.
    view full answer...
  • Trailer Hitch Recommendation for 2020 Acura RDX
    The best hitch we have for towing with your 2020 Acura RDX is the Draw Tite part # 76268 which is is a Class III hitch with a 2 inch opening which has great towing capacities of 3,500 lb trailer towing capacity and installs easily. For trailer wiring you'd then want the easy to install and very reliable Tekonsha kit part # 118800. Since 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...
    view full answer...
  • Trailer Hitch Recommendation for 2020 Acura RDX
    The hitch I recommend for your 2020 Acura RDX is the Class III Draw Tite part # 76268 as it has higher towing capacities than the Class II hitch available for your vehicle # 36114 which will help with towing and it installs easily. You'll also need the Tekonsha kit part # 118800 which installs easily and has a very reliable converter box. 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...
    view full answer...
    Image 1 for
  • Do Cargo Tie-Downs Require Removal for Installing Connector 118800 on 2019 Acura RDX
    I took a look at the instructions for the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118800 and there was no mention of cargo tie-downs, and no visual representation of needing to remove any specific tie-downs. What it did mention is that there are quite a few trim panels that need to be removed, and to do this I highly recommend the Trim Pad Remover # ALL648544. Using the Trim Pad Remover is going to make it much simpler to get the trim panels up and out of the...
    view full answer...
  • Best Trailer Hitch Receiver For 2020 Acura RDX
    The best trailer hitch receiver for your 2020 Acura RDX is the Draw-Tite Max-Frame Trailer Hitch Receiver - Custom Fit - Class III - 2" # 76268 as it has a 350lb tongue weight rating and 3500lb trailer weight rating making it perfect for a bike rack, cargo carrier, or even a ball mount for towing, and does not require any trimming to the fascia on your vehicle. With that said if you have a spare tire with a wheel larger than 18" you will need to remove it and purchase a compact spare from...
    view full answer...
  • Wiring Harness for a 2021 Acura RDX
    I have a wiring harness for your 2021 Acura RDX but the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector item # 56008 you referenced is for a 2018 and prior RDX. For the 2021 RDX you will need the Tekonsha ZCI Circuit Protected Vehicle Wiring Harness w/ 4-Pole Flat Trailer Connector and Installation Kit item # 119250KIT. This wiring harness connects to your rear tail lights to control your trailers lighting functions. The wiring is dependent on configuration of...
    view full answer...
  • Will the Draw-Tite # 76268 Hitch Fit with the Factory Trim Piece on a 2022 Acura RDX?
    Yes, the Draw-Tite Max-Frame Trailer Hitch Receiver item # 76268 will fit your 2022 Acura RDX's trim piece. I have attached a picture to show you what this hitch will look like installed on your vehicle. This hitch is custom fit and bolts directly onto your RDX with included hardware. It does not require any drilling or welding. If you are hauling a trailer you will need a wiring harness to control your trailer's lighting functions. I recommend the Tekonsha T-One Vehicle Wiring Harness...
    view full answer...
    Image 1 for
  • Recommended Trailer Hitch Receiver and 4-Way Wiring Harness For Towing Trailer With a 2021 Acura RDX
    For your 2021 Acura RDX I recommend the Curt Trailer Hitch Receiver # C95CR. This is a class III 2" receiver that will allow you to have more options for your hitch mounted accessories such as bike racks and cargo carriers. The receiver attaches to factory weld nuts that you already have in your frame. The Tekonsha T-One Vehicle Wiring Harness # 118800 will allow you to connect to the factory wiring on models with the with plus 12-volt Power Provision. If you do not have the 12-volt provision...
    view full answer...
  • Recommended Trailer Hitch for 2021 Acura RDX
    For your 2021 Acura RDX I recommend the Curt Trailer Hitch Receiver # C95CR. This Class III hitch has a 2" receiver and is assembled in the USA. I like this one over the other available options because we have found the gloss black powder coat finish on the Curt to be a bit thicker and hold up better. If you plan on doing some towing, I recommend the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118800. This wiring harness plugs into existing wiring so you...
    view full answer...
  • Curt Hitch and Identifying the 12 Volt Power Provision in a 2021 Acura RDX
    I have an explanation for your 12 volt power precision concern and a great hitch for your 2021 Acura RDX In order to determine the correct trailer wiring harness for your 2021 Acura RDX - the option for +12-Volt Power Provision or without - you can check out the 8-pin connector on the driver's side interior trim panel. I have attached a photo to help you. I have also linked some installation instructions. Once you see the 8-pin connector, check to see the number of red wires going INTO...
    view full answer...
    Image 1 for
  • Trailer Hitch Fit for a 2020 Acura RDX A-Spec
    Draw-Tite has no fit exclusions for the A-Spec, so they consider the # 76268 hitch to be a fit. I've spent a bit of time looking at photos of the rear of the standard RDX versus the A-Spec model, and haven't seen too much of a difference. Usually the two factors are a different exhaust or a lowered rear fascia. In doing the eye test, nothing jumped out anything that would prevent the hitch from fitting. If you'll be towing with your RDX, you'll need a few other items to complete your towing...
    view full answer...
  • Recommended Trailer Hitch for 2021 Acura RDX A-Spec
    The Curt Trailer Hitch Receiver # C95CR is a confirmed fit for all models of the 2021 Acura RDX, including yours with the A-Spec package. This Class III hitch has a 2" receiver with a maximum gross trailer weight of 3,500 lbs and max tongue weight of 350 lbs. Make sure to consult your owner's manual for the towing capacity of your vehicle. You will be limited by the lowest capacity whether that is the hitch or your RDX. Since you plan on towing, I recommend the Tekonsha T-One Vehicle...
    view full answer...
  • 2 inch Trailer Hitch that Fits 2021 Acura RDX
    Yes we do offer a 2 inch hitch that fits your 2021 Acura RDX like with the Curt part # C95CR. I recommend this hitch for your vehicle as it has the best towing capacities and is made in the USA. If you need trailer wiring too you'd want the part # 118800 for if your vehicle has the plus 12 volt power provision or part # 119250KIT if you do not.
    view full answer...
  • Does Curt Trailer Hitch Receiver Fit 2020 Acura RDX With Spare Tire?
    Yes, the Curt Trailer Hitch Receiver # C95CR will fit your 2020 Acura RDX that has the factory temporary spare tire. You will want to install one of 2 wiring harnesses for your RDX. You will first need to remove your drivers side rear trim panel to determine which kit you will need. There is a empty 8-pin connector on your wiring harness(see picture). If the connector has 2 red wires you will need the Tekonsha Wiring Harness # 118800 If there is only 1 red wire you will need Tekonsha...
    view full answer...
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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Kathleen M
Installed by:
Kathleen M
Employee Wilson B
Updated by:
Wilson B
Employee Isabelle B
Updated by:
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Employee Alexander C
Written by:
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