bing tracking image
  1. Custom Fit Vehicle Wiring
  2. Tekonsha
  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 4 Flat
  6. Powered Converter
THIS ITEM IS NOT A FIT FOR
2021 Ram 3500

T-One Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector

Item # 118248
Retail:$55.96
Our Price: $39.94
You Save: 29%
Custom Fit Vehicle Wiring
Not Confirmed to Fit

2021 Ram 3500

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
T-One Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector 4 Flat 118248
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

Customer Photos

Need help with installation?
Locate installers near me
Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-One connector plugs directly into OEM tow package port - no cutting, splicing or tapping required. Powered ModuLite reduces strain on wiring system. 1-800-940-8924 to order Tekonsha custom fit vehicle wiring part number 118248 or order online at etrailer.com. Free expert support on all Tekonsha products. Great prices and Fastest Shipping for T-One Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
  • All Info
  • Reviews (209)
  • Q & A (0)
  • Photos

Tekonsha Custom Fit Vehicle Wiring - 118248

  • 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 harness. T-One connector plugs directly into OEM tow package port - no cutting, splicing or tapping required. 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
    • Designed for use with a factory tow package
    • Compatible with 5-pole, 6-pole and 7-pole adapters (sold separately)
  • Connects quickly and easily - no cutting or splicing of wires
    • Locate connection point in rear cargo area
    • Plug in 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: 2.1 amps per circuit
    • Tail lights: 5 amps per circuit
  • 1-Year limited warranty


Installation

This custom-fit T-One connector plugs into your vehicle's factory tow package wiring harness, which is located behind the driver's-side interior trim panel in your rear cargo area. Once you've plugged in the connector, locate the "towing fuse" position in your fuse box and insert the included 10-amp fuse.


Once installation is complete, the 4-way flat connector will be stowed in an out-of-the-way location within your cargo area.


It is recommended that you use a small amount of grease on all electrical connections - the plug 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.



118248 Tow Ready T-1 T-Connector - OE Replacement 4-Flat - Modu-Lite

Installation Details 118248 Installation instructions

This Product Fits The Following Vehicles



California residents: click here


Customer Satisfaction Score:


Customer Reviews

T-One Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector - 118248

Average Customer Rating:  4.9 out of 5 stars   (209 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-One connector plugs directly into OEM tow package port - no cutting, splicing or tapping required. Powered ModuLite reduces strain on wiring system.

by:
2006 Toyota Highlander

Wish I bought etralier's tow harness earlier. Easy installation. Toyota dealership sold me the wrong one and of course waited too long to return. But use some of the parts from that harness on the one from etrailer(see pics). Would order again from etrailer. Thank you

Jeff

4/24/2022

Still working flawlessly from the day I installed it. Thks etrailer



by:
2004 Toyota Highlander

Pluged into the pre-wired factory tow-package connection. 10amp fuse was sent .. toyota says use 20amp in manual and in fuse box,. used a 15amp fuse,. No drilling factory holes were fine in both the electrical wire run threw hole and hitch installation pre-drilled holes for trailer hitch,.

before ordering check under the hood of your highlander's fuse box to see if it has a tow fuse option/s that tells you if its factory electrical pre-tow plug or not in the back,. look at my photo's of the wireing and hitch,. get the hitch that loops below the muffler,. also it depends on the year of the highlander,.



by:
2004 Toyota Highlander

Receive product in record time. Took longer to get myself in gear. From start to finish, removing trim as per your video, unplugging original harness, installing your product, reinstalling trim, may have taken 20 to 25 minutes. That includes using a rubber body plug to route wiring to a permanant wire mount at the hitch instead of harness out the hatch when needed.



by:
2010 Toyota Highlander

We installed this on my 2006 Highlander Hybrid in about 20 minutes. It took 20 because we are stupid. It really only takes about 10 minutes. #WellDone eTrailer. Both my hitch and harness are from you and are perfect!



by:

The item was well packed when arrived, was very easy to install and set up, video on the page was very helpful and you can see that not only is a good quality but good looking too.



by:

Instructions provided with adapter are good. My 04 Highlander without tow package had the connector under rear, driver-side cargo tray. Lift the cargo floor, remove the tire-change-tool tray, remove the two plastic nuts on the bottom of the left-side tub, and lift it out. Also under that storage tub is an unused 6mm threaded hole in the body to be used for the ground. Put a fuse in the correct spot of engine compartment fuse block (mine was empty) and good to go. See underside of fuse block lid for tow adapter fuse placement.

Michael A.

1/9/2021

Used 20 times this summer with no issues. I would buy again.



by:

I was very pleased with the perfect match and plug-and-play aspects of this connector.

The unit which I replaced had fuses in each of the leads for lights (running and left/right function). Since the leads in your unit were not similarly fused, which seemed like a good idea, I just cut off the wires heading to the trailer plug from the black box, and retained my original wiring with fuses from that point onward.

Pete T.

12/7/2015

It must be functioning perfectly, because I havent given it a second thought. I like functioning perfectly, and have high expectations it will contiue to do so.



by:

worked great - had uhaul originally do wiring - it was a mess. they had run a wire under car to battery when power was already in back with factory installed harness. The wiring harness I bought at etrailer fit perfect and was installed by me in 10 minutes or less. and was $100 dollars cheeper than uhaul. Thanks !

Scott P.

9/15/2015

It has worked perfect- no complaints.



by:
Toyota Highlander

Connected and worked with no problem. Was not sure if my highlande highbrid had the tow package but after some research i discovered that all highlander hybrids come with a tow package even if it does not have the trailer hitch receiver

Edwin R.

8/5/2015

What year is your HL highbred?Where did you find the info that all HL highbreds have the tow package?



by:

Anthony took me through everything I needed to fix an inoperative unit that had been previously installed. The etrailer video showed me everything else I needed. In hind sight I should have gotten the 4/7 pin unit since when I picked up my rental it was a 7 pin. I picked up a 7 adapter on site and was on the road. Thanks Anthony!

Bob B.

7/21/2018

Works great, been dragging our trailer for 5 months.



by:

Well made, easy install. Both items better than expected. Thanks



by:
2007 Toyota Highlander

I am no mechanic, but the hitch wiring was easy to install on our 07 Highlander. Find an installation video on-line.
Works without a hitch!

Daniel O.

4/4/2018

We have not had any issues a year later.



by:
2006 Toyota Highlander

Ordered this Toyota highlander trailer tow harness. I've been it using for over a year. It came in a timely manner, installed easily, and performs well. It is well thought out, in that it installs easily, did not have to get under the car at all to install. No special tools required. The trailer led is long enough to directly connect to either of my two trailers. (a small camper pop up, and a small 4x8 utility trailer. The led just lays in the rear tool compartment out of the way when not in use. The led simply goes under the rear hatch door when in use.



by:

Dianna was able to answer all of my questions, especially my concern about the hitch being compatible with a full sized spare tire, which it was. the hitch was installed and in use with a bike rack within hours of delivery. Just what we needed.



by:

Easy install 15 minutes start to finish including running electrical. Has worked out well.
Sanitary fits perfectly fit and finish better than OEM

Matt K.

6/19/2018

Still good just ordered new hitch and wiring kit for another vehicle



by:
Toyota Tacoma

My first purchase from etrailer and I couldn't be more pleased. The wiring kit for my Highlander ( 06) went together without a hitch, and best of all, worked perfectly. I was lucky enough to have AngelaK on the other end and she was most helpful with my order. I hung up feeling good about the whole thing. I've already recommended etrailer to my son who was having trouble with the 4way on his Tacoma.



by:
Toyota Highlander

The kit was very easy to install. I like that the trailer electrical connector is hidden inside the highlander side panel when not in use. Only takes a second to access and route through the hatch door when needed.



by:

Excellent plug and play adapter. Took a second to find the right wiring harness to plug into but then it went great! works seamlessly and stows cleanly away in the cargo area hidden storage. awesome product.



by:
2007 Toyota Highlander

I highly endorse this product. Super easy to install (2007 Toyota Highlander) and made my life ten times easier. Had to haul a trailer full of film equipment 3 hours up to Vermont and back with 6 college students in the car. Worked beautifully to and from. Need to upgrade the harness on my Subaru Outback sometime soon. I know where I'm buying it from.



by:

Ordering with etrailer was super helpful. I was adding a hitch to an older model highlander and e trailer staff were awesome at getting back to me by phone and emailing links to make sure I got exactly what I needed. Shipment to Alberta Canada was prompt. Would definitely recommend ordering from e trailer.



by:
2007 Toyota Highlander

After troubleshooting why my trailer lights were not working, I discovered that the power module on my 2007 Toyota Highlander was bad. I searched the net and found etrailer.com, found a replacement wiring harness and ordered it. The harness arrived quicker than I expected and I was able to remove the old harness and replace with the new with no problems. The new harness works great! I'm back on the road with my bass boat lookin' for that lunker.



by:
2007 Toyota Highlander

The wiring harness fits just as advertised and works great. Very fast communication from etrailer when the original part number that I ordered was on back order. They saw the problem and suggested an alternate part that was available to ship immediately within just a few hours of my online order.



by:
Toyota

Very nice products - loved the fabrication and powder-coating of the hitch. Shipped promptly, good on-line tracking information. Good prices. Good instructions. It only took about an hour to install the hitch and wiring harness.

Only possible improvements might be to omit the purchase order label stuck to the hitch. It was tough to get off. The installation took a little longer because I had to run to the parts store as part of the installation was to purchase three plastic one-time fasteners that Toyota uses to cover the fuse panel.

I'm a happy customer!



by:
Toyota

Very nice products - loved the fabrication and powder-coating of the hitch. Shipped promptly, good on-line tracking information. Good prices. Good instructions. It only took about an hour to install the hitch and wiring harness.

Only possible improvements might be to omit the purchase order label stuck to the hitch. It was tough to get off. The installation took a little longer because I had to run to the parts store as part of the installation was to purchase three plastic one-time fasteners that Toyota uses to cover the fuse panel.

I'm a happy customer!



by:
2006 Toyota Highlander

Trailer light harness for a 2006 Toyota Highlander Hybrid was easy to install (once I found the correct connector), and worked perfectly. Unfortunately, we sold the vehicle not long after the installation, so I didn't get to use it as much as I had planned.


25
209
Show More Reviews

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

  • Factory Tow Package Connection Point to Install Trailer Wiring on a 2005 Toyota Highlander
    If your 2005 Toyota Highlander came with the factory tow package then the factory connection point to add a 4-Way will be located behind the driver side interior trim panel in the rear cargo area of the vehicle. You would then use wiring harness # 118248. I have linked a video showing installation and a link to the instructions for you. If that connector is not present on your Highlander then you will need to use harness # 118413. This wiring harness just plugs in line with the vehicle...
    view full answer...
  • Will etrailer.com Trailer Hitch Receiver for a 2006 Toyota Highlander Fit the Hybrid Model
    Our fit guide splits up the hitches for your 2006 Toyota Highlander into two categories: those that are confirmed to fit the Hybrid model and those that aren't. The etrailer.com hitch, part # E98857, fits both the Hybrids and non-Hybrids so it shows up under both categories which can be kind of confusing sometimes. Rest assured, it does fit your Hybrid Highlander. If you're going to be towing with your Highlander you also need a wiring harness. Part # 118248 fits if you have the tow...
    view full answer...
  • Trailer Wiring Harness for 2005 Toyota Highlander Limited
    Since your Highlander has the tow package, you'll want to use the Tekonsha # 118248 wiring harness. You'll want to use a circuit tester like # PTW2993 to probe the sockets on that connector in your photo to make sure it's active. If it isn't, make sure there's a 20A fuse installed in location # 11 in the fuse panel in the engine compartment (see provided diagram). I've linked you to an installation video.
    view full answer...
    Image 1 for Image 2 for
  • Receiver Hitch, Wiring and Other Necessary Towing Accessories for 2007 Dodge Caliber
    In order to tow a trailer, you will need a hitch, a draw bar and pin and clip, a trailer ball and a vehicle wiring harness. I would recommend the Draw-Tite Class I receiver, part # 24769. This receiver fits all Caliber Models EXCEPT for the R/T model. This hitch includes the pin and clip. If you have the R/T model, Curt Manufacturing offers a Class I receiver, part # C11006 that will fit all models except for the SRT-4. The draw bar and pin and clip are also included. The trailer rental...
    view full answer...
  • Class III Trailer Hitch Fits for 2004 Toyota Highlander
    We offer two options in a 2-inch Class III hitch for your 2004 Toyota Highlander that are rated for 3500-lbs gross trailer weight, Curt # 13530 and Draw-Tite # 75153. Both share a similar design since they must fit to the same mounting points on the vehicle. Since both are round crosstube hitches I suggest the Curt # 13530 since it costs less. You can see the entire installation process on the 2004 Highlander as well as the finished appearance by viewing the video I linked for you. The...
    view full answer...
  • How to Determine if a Vehicle Like a 2007 Toyota Highlander has a Tow Package
    Tow packages usually consist of hitches, wiring, lower gear differentials, transmission coolers and bigger brakes. For most vehicles if you have most of those items then you have the tow package. The final authority would be contacting a Toyota dealer with your VIN number, and they will tell you for certain. Since you have the connections already on your 2007 Toyota Highlander it sounds like you have it and the Tow Ready Harness part # 118248, but you still might want to contact your Toyota...
    view full answer...
  • Trailer Wiring Harness for a 2005 Toyota Highlander with Factory Installed Tow Package
    Since your 2005 Toyota Highlander came with a factory tow package, you would need Tow Package Wiring Harness with 4 Pole Trailer Connector, # 118248. I have included a link to the installation instructions along with a link to a video showing a typical installation for you to view.
    view full answer...
  • Trailer Wiring Recommendation for 2004 Toyota Highlander with Tow Package
    For your 2004 Toyota Highlander with a factory tow package the best trailer wiring option we have is the Tekonsha part # 118248 which is a confirmed fit. Tekonsha is the most reliable brand we offer for trailer wiring so we recommend it highly.
    view full answer...
  • Troubleshooting Trailer Wiring 4-Way that Running Light Circuit is Active all the Time
    What you described sounds like a shorted out converter box. Here is how you can test to be sure though: What you will want to do is test the wires going into the box of the converter box for voltage with a circuit tester like the # PTW2993 to see if there is voltage going into the box when the taillight functions of your vehicle are applied, and then test the output side of the box to see if the current is making it through the converter. If not then the problem is that the converter box...
    view full answer...
  • Wiring Harness for a 2003 Toyota Highlander
    The wiring harness you referred to, product number 118248, will not fit your vehicle. You will need either wiring harness part number 118413 or 33425 for your 2003 Toyota Highlander. If your vehicle has the tow package, please use item number 118245. This is the connector which plugs into the white plug you found. There are instruction sheets for each of the parts listed on their product page. For your convenience, I have attached links to all of the items I referred to. I have also attached...
    view full answer...
  • Recommended Wiring Harness for 2004 Toyota Highlander with Factory Tow Package
    Since it sounds as if your Highlander is equipped with the tow package, your best bet would be to use the harness designed to be used in vehicles with the tow package, part # 118248. This harness would utilize the factory connector located in the cargo area as shown in the instructions. You could certainly use either the # 118413 or 33425. Each of these harnesses install by plugging inline to the existing wiring behind the tail light assemblies, which would be more complex and time consuming...
    view full answer...
  • Can Tow Ready Wiring Harness # 118413 Be Used in 2007 Toyota Highlander with Factory Tow Package
    The harness you purchased, part # 118413, as you note is intended for the Highlander without the factory tow package wiring. This harness has separate left- and right-side light functions carried on independent connectors that connect in-line with the tail light wiring. The harness for tow package-equipped Highlanders, part # 118248, has a single connector intended to mate with a properly-equipped harness on the tow-equipped Highlander. Its left- and right-side functions are combined into...
    view full answer...
  • How to Add a 7-Way Trailer Connector to a 2005 Toyota Highlander with Tow Package
    If your 2005 Toyota Highlander does not currently have any trailer connector but does have the tow package then you will first need to install a 4-Way such as # 118248. If it did not have the tow package you would use # 118413. Then you would need a 4 to 7-Way adapter. You can use # 30717 but I recommend # 37185 since it comes with a mounting bracket. For either you will need to make sure the white wire is grounded to a clean bare metal surface. Since you only need the light functions...
    view full answer...
  • How to Clean Rusty Weld Nuts for Trailer Hitch Installation on a 2004 Toyota Highlander
    Before using a tap to clean the threads, I recommend taking a different approach first to clean them out. Using some WD-40, a wire brush or battery terminal brush like # DW00254, and a little elbow grease, you should be able to clean out the threads without potentially damaging the threads on your 2004 Toyota Highlander. I have included links to an FAQ article and a video showing the process. There should be 6 bolt holes with weld nuts, 3 on each frame rail. The bolts that fit them are...
    view full answer...
  • Troubleshooting Trailer Harness On 2004 Toyota Highlander
    If the lights are not working on your trailer and you are unable to find any current at the vehicle side connector it sounds like you may have a blown fuse. Per the installation instructions for the T-One Vehicle Wiring Harness for Factory Tow Package, part # 118248, you will need to find the towing fuse and insert the included 10-amp fuse. Look in the engine compartment for the fuse. From my research I found that the towing fuse is in position 11. Check the fuse to make sure it is good...
    view full answer...
  • Recommended Wiring Harness for a 2004 Toyota Highlander With a Factory Tow Package
    The 2 options for a 4-Way wiring harness that you have for your 2004 Toyota Highlander are just different manufacturers. Out of the Tekonsha T-One Wiring Harness # 118248 and the Curt T-Connector Wiring Harness # C56107, I recommend going with the Tekonsha version as Tekonsha is one of our most reliable wiring companies. I have attached a video of the T-One harness being installed on a 2004 Highlander for you to reference as well. If you are needing to install a 7-Way wiring harness at...
    view full answer...
  • Trailer Hitch and Wiring for a 2007 Toyota Highlander
    Draw-Tite, the manufacturer of trailer hitch # 75726, lists it as a fit for 2008 to 2013 Toyota Highlanders so I cannot recommend it for a 2007 model. The Draw-Tite equivalent for the 2007 is # 75153. I have linked a video showing an example installation of this hitch for you. If you plan on doing some towing I recommend etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with a 3/4 inch rise or 2 inch drop and one with a 2-3/4 inch rise or 4 inch drop. It also includes...
    view full answer...
  • Why Am I Not Getting Any Power on My Converter on My 2005 Toyota Highlander?
    Since you have power at your 2005 Toyota Highlander's factory connector but no power output after the converter, it is likely that the converter is bad. I recommend testing the wires on the harness before the box if you haven't already. If you have power at that location and no power at the 4-way, you will need a new harness. If you need a testing kit, # PTW2993 will work great for you. If you do discover power on the wiring harness before the converter box, you will need a new 4-way wiring...
    view full answer...
  • Should Included 10 amp Fuse of the Tow Ready Wiring Harness part # 118248 Be Used or Factory 20 Amp
    You want to use the included 10 amp fuse that came with the Tow Ready wiring harness part # 118248. The amperage rating of the included fuse was picked because if the voltage exceeds 10 amps on that circuit the wiring harness will fail. It comes down to which you would rather replace in the event of a short, the 10 amp fuse or the # 118248.
    view full answer...
  • Installation Video for 2004 Toyota Highlander 4-Way Trailer Wiring Harness
    The Tekonsha T-One Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector # 118248 will be a simple plug in connection to your 2004 Toyota Highlander. I've attached the video you requested to show you the harness connection point as well as the fuse connection location on your vehicle to assist.
    view full answer...
  • How To Install a Tekonsha Prodigy Proportional Brake Controller on a 2008 Toyota FJ Cruiser
    There is no custom wiring for the FJ Cruiser that plugs in under the dashboard for a brake controller. To install a brake controller you would need to run wires from the 7-way connector. If you have no wiring on the vehicle now we recommend the appropriate flat four pole harness part # 118248 for an FJ with tow package or part # 118405 for an FJ without tow package. Once you have the 4-Way in operation, you can convert it to a 7-Way using part # ETBC7. You will then attach the red wire...
    view full answer...
  • Will Wiring Harness Part # 118248 Fit a 2007 Toyota Highlander without a Tow Package
    The 118248 is only for 2007 Highlanders with a tow package. If you do not have a tow package, you would use part # 118413.
    view full answer...
  • How To Find the Trailer Fuses and Relays On a 2006 Toyota Highlander Hybrid
    If you have a factory plug on your 2006 Toyota Highlander then these circuits will be protected by fuses and relays built into the factory fuse box located under your hood. In order to be sure you are looking in the correct locations you will need to either look in your owner's manual for these locations or there will be a diagram printed on the underside of the fuse box lid with this information for you. If you do not already have the trailer connector portion of the harness then I recommend...
    view full answer...
  • Trailer Wiring Kits that Fit 2004 Toyota Highlander
    We have two trailer wiring kits that fit your 2004 Toyota Highlander. We have the # 118413 which fits all styles of the vehicle and the # 118248 which fits the versions of the vehicle that have tow package wiring. This is normally the kit I'd recommend for you since you have the tow package, but since it sounds like you looked for the correct connector and couldn't find it the safe bet is the # 118413 which easily installs by plugging inline with the vehicle's taillight connectors. I attached...
    view full answer...


< Previous



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


Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Sarah L
Expert Research:
Sarah L
Employee Robert G
Expert Research:
Robert G
Employee Patrick B
Expert Research:
Patrick B
Employee Michael H
Expert Research:
Michael H
Employee Reno H
Expert Research:
Reno H
Employee Jameson C
Expert Research:
Jameson C
Employee John H
Expert Research:
John H
Employee Adam R
Expert Research:
Adam R
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Zack K
Video Edited:
Zack K
Employee Laura H
Updated by:
Laura H
Employee Alexander C
Updated by:
Alexander C
Employee Isabelle B
Updated by:
Isabelle B
Employee Cole B
Installed by:
Cole B

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.