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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 # 118648
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Our Price: $91.65
Custom Fit Vehicle Wiring

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118648 - 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. Powered ModuLite reduces strain on wiring system. Call 800-298-1624 to order Tekonsha custom fit vehicle wiring part number 118648 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 (34928)
  • Q & A (113)
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  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118648

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • Tekonsha
  • Powered 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. 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 behind tail lights
    • Plug in T-connector
  • Includes ModuLite power converter to ensure that your vehicle's wiring matches that of your trailer
    • Powered module connects 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: 2.1 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 behind the driver's-side and passenger's-side tail lights. You will have to remove the tail light assemblies to access this harness. Once you've plugged in the T-connector, run the hot lead up to your car battery. Connect the lead to the included fuse holder, and then connect the fuse holder to the positive terminal on your battery and insert the provided fuse.


T-One Connection Location Points Behind Tail Lights

Once installation is complete, the 4-way flat connector will be stowed in the jack storage compartment of 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.



118648 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

Installation Details 118648 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 - 118648

Average Customer Rating:  4.8 out of 5 stars   (34905 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.

- 118648
by:
Toyota Sienna

I installed the wiring myself on my Toyota sienna. I did not have a problem with any part of the installation. It took a while but at the same time I was working slowly to make sure I did it right and I was just enjoying working on my van, seeing the under side when running the wiring up to the front. I used an actually fishing pole and stuck it into a hole in the engine compartment to fish it up to my battery. I installed the little dude box right there next to my battery. I had more then enough length of wires which I don't understand why some people complained about it being too long. I actually had about 3 feet left. I ran it under my van and up through the engine compartment to my battery. I was not very confusing to clip to the clip to the appropriate clip on the lights because of the shape. Making sure which side is which was a little confusing but just paying attention to what you are doing will make that an easy job. I'm glad I did it myself.


Comments
So far I havent had any problems at all. The fuse hasnt blown, the rain hasnt shorted it the circuit. They have worked everytime I hooked up the trailer. Its worked perfectly for me.
Kurt Z - 03/30/2021


- 118648
by:

it fit! just like they said it would. the help vids are great. took me longer twice the est time to do it but overthink everything. super happy. insane fast shipping. great company to deal with. also bought a hitch and stuff. same experience with that. thx etrailer!



- 118648
by:

I followed the instructions that were provided and I’ve had no issues. My incandescent bulbs on my trailer are much brighter over my previous vehicle’s T connector without dedicated power. Wiring: I actually ran a single larger gauge wire from the battery to a distribution post and created a dedicated ground in the jack compartment.



- 118648
by:
2019 Toyota Sienna

Installation of the hitch, wiring,rear bike rack, and new roof rack towers went well. I didn't set any speed records, but I was more concerned with doing no damage on a new 2019 Toyota Sienna AWD van. The hitch fit up well per instructions except that I was able to work around the exhaust without lowering it. Underbody panel and rear fascia did both need to be removed. Very happy with the end result. The new van is now set up to haul the bikes and canoes and move my log splitter.



- 118648
by:

I installed the wiring harness and it has worked fine. It was easy to install,just followed the directions and has worked without any problems



- 118648
by:

Quality and fitment of products was excellent. Highly recommend install videos on etrailer. The shipping time was very slow. I had some items price matched and that delayed processing a week or more.I provided all links to competitor's products. Very close to month before I received product (it was in stock). That is why I didn't give it an excellent rating.



- 118648
by:
Toyota Sienna

DIYer: The product was very easy to install, and the instructional videos linked from this website cleared up any issues that I may have had. Note: The SE/non-SE wiring harnesses install in the opposite direction, ensure that you are using the appropriate video link when installing. Overall, I would highly recommend this product to anyone needing a wiring harness on their 2020 Toyota Sienna XLE.



- 118648
by:
2015 Toyota Sienna

I ordered a hitch and the wiring for my new 2015 sienna minivan. The parts came quicker than I could have hoped for. The video instructions made the installation easy, especially since my van was a week old and I really didn't want to mess it up. I have been using the van to tow with for a year now without any troubles. Thanks Etrailer!



- 118648
by:
2015 Toyota Sienna

Very easy to install. Total wiring time = 45 min. I did not take apart the rear panel by the driver side taillight to run the wire harness. It was a little difficult to fish through due to the size of the connections.



- 118648
by:
2015 Toyota Sienna

Fit perfect. Worked perfect. Made for an easy installation.


Comments
Still works great! Only complaint is exhaust bumping it occasionally making a bit of noise. Mostly when turning semi-quickly. Otherwise I’ve had 0 issues.
Billy - 05/31/2021


- 118648
by:
Toyota Sienna

Works well on my '19 Sienna. Ran power inside behind right side panels and sills, behind center console and out through large rubber grommet over gas pedal. Wire length was perfect.



- 118648
by:
2019 Toyota Sienna

Install was easy, I watched the instruction video about 3 times and kept it up on my phone to verify my connections when it was time. I had the job complete including all cleanup and mounting the electrical connection to the hitch in about 2/12 hours. I took my time to verify no damage was done to our new sienna.



- 118648
by:

I installed the T-One wiring harness in a 2018 Toyota Sienna mini-van. The instructions were easy to follow and the connectors to the rear lights were exactly what was needed for the van. The extension that is pulled out to connect to the boat trailer worked as expected and I store it in the side rear wall cavity, which also houses the tire changing jack. For installation, some reviews I read tapped into the wiring to one of the rear plug-in outlets. I was not comfortable doing that so I choose to run the wiring to the battery (in the front-mounted engine area) internally and well hidden under carpet and side panels. The biggest (and only) challenge was to penetrate through the "firewall" barrier between the engine compartment and the car's passenger side front seat area. Mission accomplished. The function of the harness has worked flawlessly. If I ever install wiring to provide working running, brake, and turn signal lighting to a trailer, I certainly would return to etrailer.com.



- 118648
by:

One year review. The wiring, installation and instructions was easy and quick. Everything you need is included in the kit.



- 118648
by:
2019 Toyota Sienna

Got the wiring harness in the mail and got it installed the very same day. Easy to follow instructions and was designed for my vehicle. Was able to pick up the travel trailer the next day after installation.



- 118648
by:

Worked great and the install videos really help



- 118648
by:
2015 Toyota Sienna

Works well. I ran it through the interior of the car instead of under the chassis. Since I don't have a lift; that was a better option.



- 118648
by:
2015 Toyota Sienna

Very nice and complete wiring harness. Be careful, though, not to follow the directions on the video, because they are wiring opposite than what the directions tell you. I had to undo all I had done when I went to wire up the passenger side and didn't have enough wire! Also, be sure to run wire that goes to battery in as short a run as possible. I had to go buy more wire since I ended up 2 feet short.



- 118648
by:
2018 Toyota Sienna

Easy installation in the jack storage area. Found a open spot to run power wire throught a harnes grommet so I could run power back to the converter inside and under trim



- 118648
by:

I haven't towed with it yet, but I just finished the installation. I did not use a car ramp so it was a bit tight crawling under neath to run the wire back to the battery for power. Make sure you have a crimping tool and the install isn't too bad.



- 118648
by:

The wiring harness is well designed and fairly easy to install, although running the wire up to the battery was not easy.



- 118648
by:

We had it installed and it looks great. Unfortunately the pandemic hit, then winter set in, so we haven't used it. Looking forward to some better weather and a chance to put it to use.



- 118648
by:
2016 Toyota Sienna

Superb. I cannot imagine going elsewhere for hitches and accessories. Since I am not too handy I find the videos invaluable as a source of techniques and tips. The kit contained everything necessary for the installation except basic tools. The trailer lights worked first time so what more need be said. I needed the trailer in a hurry but I did not have a way to lift the van so I could only do a temporary job of running the hot lead forward to the battery, with the plan to have my regular auto mechanic redo it correctly asap. You will have to lift the van somehow to do a thorough job of securing that long lead. I wish I had bought dielectric grease, extra double sided tape and extra connectors.


Comments
After one year it still works perfectly and I am fully satisfied. Great product and service from eTrailer.
Colin S - 10/06/2018



- 118648
by:
2017 Toyota Sienna

Easy to install. I did not run a wire up to the battery/fuse block. I installed a cigarette plug on the wire and used the power point near the tailgate. I keep the cigarette plug and trailer plug wires in the jack storage area. I rarely use the trailer lights as my hitch is mostly used for bike racks and a hitch basket. Shipping was fast.


Comments
Drawing the power directly from the battery serves to isolate the tow vehicles sensitive electronics from any short circuits that might occur in the trailer wiring. Connecting the converters power feed anywhere other than the battery or where the converters manufacturer recommends can leave your vehicles electrical system exposed to possible damage, and will also unfortunately void any warranty coverage.
-- Etrailer Expert Mike L - 09/05/2018


- 118648
by:
2018 Toyota Sienna

For 2017 Toyota Sienna Limited AWD. I have installed 4 hitches over the past 20 years, and this is the best-designed one yet. The frame tucks completely up and behind the bumper, so only the box part of the receiver is visible right below the bumper. It's really well designed, so after you reinstall the plastic shield that is under the car, the entire hitch frame is completely concealed. If your Sienna is AWD or FWD does not matter, it's the same hitch, and it is far away from anything that could interfere. One installation tip: After the hitch is installed, reinstall the plastic shield using only the screws toward the front of the car, to hold it in place. Then you can trim just the minimum amount (I used metal snips, but probably tough scissors or a razor knife would do it also) from around the receiver box part, and then reinstall the rest of the screws to put the plastic shield fully back in place.


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Ask the Experts about this Tekonsha Custom Fit Vehicle Wiring

  • Recommended 7/4-Way Trailer Wiring Harness for 2020 Toyota Sienna XLE
    The trailer wiring harness I recommend for a 2020 Toyota Sienna XLE is the T-One Vehicle Wiring Harness part # 118648 as it is a plug-n-play fit and our most reliable option. That said, this harness only has a 4-way but that's all that is available for this vehicle. However, you can convert this to a 7-way using the 7-Way RV Upgrade Kit for Trailer Brake Controller Installation part # ETBC7L which comes with both 4 and 7-way connection points. Please note, if the trailer has brakes then...
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  • Best Trailer Wiring Harness for a 2018 Toyota Sienna
    The best trailer wiring harness we have for your 2018 Toyota Sienna is going to be the T-One Vehicle Wiring Harness part # 118498 if you have the SE model with features such as daytime running lights, 4.2" color multi-information display, and a premium audio system. If you have the LE or XLE then you will want to use the T-One Vehicle Wiring Harness part # 118648. They both install in the same way which requires you to remove the tail light housings, plugging in the t-one connectors,...
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  • How To Install 7-Way Trailer Connector on a 2015 Toyota Sienna (L, LE, XLE and Limited)
    In order to install a 7-way trailer connector on a 2015 Toyota Sienna (L, LE, XLE and Limited) you'll first need to start with a 4-way, the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118648 is what I recommend and it's plug-in-play. Then, you can use a 4 to 7-way adapter, the 7-Way RV Upgrade Kit for Trailer Brake Controller Installation part # ETBC7L which works perfectly with the Curt Echo Wireless Trailer Brake Controller part # C51180 if the trailer has brakes....
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  • Can the T-One Vehicle Wiring Harness for a 2017 Toyota Sienna Be Powered Using the Rear 12 Volt Aux
    The T-One Vehicle Wiring Harness part # 118648 which is a fit for your 2017 Toyota Sienna will need to be powered directly from the vehicle's battery. If you choose to use the rear 12 volt auxiliary power which is not what I recommend then you will need to do so at your own risk. The maximum amp draw for the above trailer wiring harness is separated between two circuits, 7.5 amps for the tail lights and 2.1 amps for the stop/turn signal lights. I have attached an install video that shows...
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  • Does Hot Lead for Both 4-Way Harness and 7-Way Connector Need to be Run on Vehicle
    The Tekonsha T-One Vehicle Wiring Harness 4-Way Connector # 118648 for your 2017 Toyota Sienna does require that a hot lead be run to the vehicle battery. This hot lead is needed to power the converter for the 4-Way harness and will be separate from the power wire that needs to be installed for a 7-Way kit like # ETBC7. The 12V wire for a 7-Way is ran to the battery for the 12V pin at the connector. Both power wires will need to be run to the battery. I also don't recommend running...
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  • Install Video to Use for Tekonsha Trailer Wiring Harness on 2017 Toyota Sienna
    I attached the install video we shot for the Tekonsha trailer wiring harness part # 118648 on a 2017 Toyota Sienna. I would recommend following it as a guide completely and you'll have no issues with the harness and would be installing it in a way that wouldn't void the warranty.
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  • Trailer Wiring Harness that Fits 2020 Toyota Sienna
    Yes, the Tekonsha 4-way kit part # 118648 that you referenced is the correct trailer wiring kit for your 2020 Toyota Sienna. This installs by plugging inline with the taillights like you can see in the attached install video.
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  • Recommended Trailer Wiring Harness for 2017 Toyota Sienna XLE
    For your 2017 Toyota Sienna XLE, I recommend the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118648. This harness plugs into your Toyota Sienna's wiring harness, which is located behind the driver's-side and passenger's-side tail lights. You will then run the included power wire to your vehicle battery. This will power the harness and protect your vehicle's electronics. I've attached a video of this installation and have attached an article to help with...
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  • Trailer Wiring Harness for 2015 Toyota Sienna XLE
    For your 2015 Toyota Sienna XLE you will need the T-One Vehicle Wiring Harness, # 118648. This wiring harness is designed for all models of the 2015 Sienna except the SE. I have included an installation video for you.
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  • Is a 2018 Toyota Sienna Factory Wired for Trailer Wiring Harness and Converter?
    For your 2018 Toyota Sienna, the factory wiring harness at the tail lights is the extent of the wiring for trailer connections. This means you can use a T-One wiring harness with a converter integrated, but you will need to run the power wire to your battery. I recommend the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118648 as it is consistently the best brand for long term function. I've attached a couple videos to help with installation and have...
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  • Total Amp Rating Of Tekonsha T-One Needed For 4-way Connection To Uhaul 5x9 Utility Trailer
    The T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118648 has a maximum amperage of 2.1 amps per circuit for the stop/turn lights and 7.5 amps per circuit for the tail lights. It is designed for a 15 amp fuse, so I can't recommend running the wire to a 10 amp outlet as overloading a circuit could cause a fire. The kit comes with the wire needed for running the 12 gauge wire to the battery and that is my recommendation. It takes a little more work to install but will...
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  • Correct Trailer Wiring Harness for 2019 Toyota Sienna LE
    For your 2019 Toyota Sienna LE I highly recommend the Tekonsha T-One Wiring Harness # 118648, which will plug right in behind the tail lights. Once you run the power lead up to the battery you'll have a fully functional 4-Way connector to power the camper's signal lights. I have attached a full install video on the 19 Sienna below that you can follow along with too.
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  • Easy Solution for Trailer Wiring Install Harness Installed Backwards 118648
    If I were in your situation I would do exactly what you described. Just swapping the green and yellow wires on the output side of the converter going to the 4-way will take care of the harness being installed backwards without any negative impact at all.
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  • Adding a Trailer Wiring Harness and Brake Controller to a 2006 Toyota Sienna
    Trailer wiring harness # 118648 fits the 2015 to 2017 Toyota Sienna but not your 2006 model. For your 2006 Toyota Sienna the comparable trailer wiring harness is # 118304. This is not a powered harness though so if you want one that does both fit your van and require a connection to the battery you can use Hopkins harness # HM11143485. Since the trailer you want to tow has electric brakes you will also need to install a 7-Way trailer connector, in addition to one of the 4-Ways listed...
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  • Trailer Wiring Harness for 2019 Toyota Sienna XLE That Does Not Require Splicing
    For your 2019 Toyota Sienna XLE the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118648 will work perfectly for you without any type of splicing into your wires needed. To install this you will need to plug the harness into your tail light housing, which is why no splicing is needed. I do highly recommend using Trim Pad Remover # ALL648544 for easier access, and I have added a link to the written instructions as well as a link to a video install on a '19 Sienna...
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  • Which Trailer Wiring Harness Will Work With 2017 Toyota Sienna LE
    The difference between part # 118648 and part # 118498 is that part # 118498 is designed for the SE model and part # 118648 is designed to work with Siennas that are not the SE model. Since you came from the non-SE model the trailer wiring harness that will work for you is part # 118648. This trailer harness is a simple installation. You just plug it into the connection points behind the driver and passenger side tail lights and then run the hot lead wire to the positive battery post...
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  • Trailer Wiring Harness Recommendation for 2017 Toyota Sienna
    For trailer wiring harnesses I prefer the Tekonsha brand as they tend to be more reliable over time. So for your 2017 Toyota Sienna you would want the part # 118648 which is a confirmed fit. I attached an install video for you to check out as well.
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  • Trailer Wiring Harness Fit for 2017 Toyota Sienna LE
    The plug-in trailer wiring harness that fits your 2017 Toyota Sienna LE is the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118648. This will not require any type of wire splicing and is a plug-in connection. I have added a link showing a video install on a 2017 Toyota Sienna for you to check out as well. To complete your towing setup I recommend the etrailer Trailer Hitch Receiver # e98837.
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  • Does a 2017 Toyota Sienna Comes With a Factory Trailer Wiring Harness
    I do not believe a 2017 Toyota Sienna comes with a factory trailer wiring harness but I do have what you need to add one, the T-One Vehicle Wiring Harness part # 118498 for SE trims or part # 118648 for all other trims. These harnesses are both plug and play options that do not require any splicing. I recommend the T-One Vehicle Wiring Harness in particular because they have the best reputation for longevity and reliability. I have attached an install video for you on both options.
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  • Can Trailer Connector for 2018 Toyota Sienna LE Test Good and Still Have Fuse Blow
    Yes, it is possible the T-One Vehicle Wiring Harness # 118648 for your 2018 Toyota Sienna LE can test fine and still blow a fuse if you are over the capacity of 2.1 amps per circuit for the stop/turn lights. If you are over that you can switch to the Curt T-Connector Vehicle Wiring Harness # C56261 which has a 3.0 amps per circuit capacity for the stop/turn lights, but it has just a 5.0 amps per circuit capacity for the tail lights, which is quite a bit less than the Tekonsha's 7.5 amps...
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  • Trailer Wiring T-Connector Compatible with 2018 Toyota Sienna SE
    For your 2018 Toyota Sienna SE I recommend the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118498. This is the confirmed fit for the SE model which is slightly different than the other models. It will install in the same way behind the tail light assemblies and with power directly from the vehicle battery to protect your Sienna SE wiring and electronics. I've attached a video to assist as well as an article for help routing that power wire. Once the installation...
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  • Differences in 118648 and 118498 Trailer Taillight Wiring Harnesses for 2017 Toyota Sienna
    The difference between the # 118648 and the # 118498 is the taillight assemblies on the SE model are different, they use different connectors. The 2017 Toyota Sienna SE would use the # 118498 while all other models, including your XLE would use the # 118648. If you click the provided link, you can see an install video for the # 118648.
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  • Recommended Trailer Hitch for 2019 Toyota Sienna with Most Ground Clearance
    Ground clearance is definitely important so a concealed trailer hitch is a smart choice for your 2019 Toyota Sienna. Somewhat surprisingly, when we test fit trailer hitches that fit a '19 Sienna, they each had the same approximate 13" measure from the top of the receiver to the ground - the EcoHitch Hidden Trailer Hitch # 306-X7255, Curt Trailer Hitch # C13343, etrailer.com Trailer Hitch # E98853 and Draw-Tite Trailer Hitch # 76112. Since the clearance from the ground will be the same...
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  • Recommended Trailer Hitch for 2019 Toyota Sienna for Ground Clearance
    The trailer hitch I recommend for your 2019 Toyota Sienna is the Draw-Tite Trailer Hitch # 76112 because if you plan on towing, this hitch is rated for weight distribution and the similar hitches are not. When we test fit the Draw-Tite Hitch # 76112, Curt Hitch # C13343, etrailer.com Hitch # E98853 and EcoHitch # 306-X7255 on a 2019 Toyota Sienna we found that each of them have 13 inches of ground clearance, and with the exception of the EcoHitch, have a 525 lb tongue weight capacity...
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  • Trailer Hitch Recommendation for 2020 Toyota Sienna for Ground Clearance
    To avoid any issues with ground clearance with your 2020 Toyota Sienna, I strongly recommend a trailer hitch with a concealed crosstube because they will sit up higher and give you more ground clearance than a hitch with a visible crosstube. When we test fit the three trailer hitches that fit your 2020 Sienna that have a concealed crosstube - the etrailer.com Trailer Hitch Receiver # e98853, Curt Trailer Hitch Receiver # C13343, and Draw-Tite Trailer Hitch Receiver # 76112 - we found...
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  • Recommended Trailer Hitch and Wiring for a 2018 Toyota Sienna XLE
    The best trailer hitch for your 2018 Toyota Sienna XLE is the etrailer.com # e98853. This is a Class III trailer hitch with a 2" receiver. It features a matte black finish that hides scratches really well, a concealed crosstube, and the best clearance compared to other trailer hitches which is key when using accessories. Then for wiring I recommend the Tekonsha T-One # 118648. This plugs in behind your tail lights and then draws power directly from your battery so that the OEM wiring...
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  • Installation Instructions for etrailer Trailer Hitch Receiver for 2019 Toyota Sienna
    We do have the instructions available for the etrailer Trailer Hitch Receiver # e98837 that fits your 2019 Toyota Sienna. I have added a link below to the installation instructions for you, as well as attached a copy for you here. I have also added a link to a video installation for you to check out on a similar model year Sienna which may be helpful. Also, just wanted to mention in case you also happen to need a trailer wiring harness that the correct fit for your Sienna is the...
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