1. Custom Fit Vehicle Wiring
  2. Tekonsha
  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 4 Flat
  6. Converter
T-One Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector

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

Item # 118258
lowest price pledge
Retail:$84.43
Our Price: $45.03
You Save: 47%
Custom Fit Vehicle Wiring

Will this fit?

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

Orders above $99 qualify for Free Shipping
Shipping Weight: 0.91 lbs
Quantity: 
In Stock
118258 - Converter Tekonsha Trailer Hitch Wiring
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

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 harness - no cutting, splicing or tapping required. Powered ModuLite reduces strain on wiring system. Call 800-298-8924 to order Tekonsha custom fit vehicle wiring part number 118258 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 for Factory Tow Package - 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
  • All Info
  • Reviews (109)
  • Q & A (78)
  • Photos
  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118258

  • Custom Fit
  • Trailer Hitch Wiring
  • Tekonsha
  • 4 Flat
  • Converter

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 harness - 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 points beneath your vehicle, on the driver's side
    • Plug in connectors
  • 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: 5.6 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 beneath the rear driver's side of your vehicle. You will find the harness attached to a grommet between the wheel well and the bumper. Once you've plugged in the connectors, insert the included fuse into the in-line fuse holder.


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 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.



118258 Tow Ready T-1 T-Connector - OE Replacement 4-Flat - Modu-Lite

Installation Details 118258 Installation instructions

This Product Fits The Following Vehicles



California residents: click here



Customer Reviews

T-One Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector - 118258

Average Customer Rating:  4.7 out of 5 stars   (109 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 harness - no cutting, splicing or tapping required. Powered ModuLite reduces strain on wiring system.

- 118258
by:

Directions accurately described and has held up well. 802089



- 118258
by:

Harness as exactly as described and installed with little trouble 799930



- 118258
by:
2008 Hyundai Santa Fe

Very easy install great fitment 794502



- 118258
by:
2007 Hyundai Santa Fe

Product quality very high, delivery very fast, shipping container (cardboard box) was not strong enough to support handling/shipment, box bottom was ruptured with hitch assembly hanging out, box should be supported stronger, no parts missing, hitch was scratched up somebut, nothing that a little black paint didn't fix. I installed the wiring harness connections and fuse box on the external side of the vehicle to eliminate having to take apart the internal sheet metal panels and providing easy access to the fuse in the event of fuse failure, this eliminates the necessity of interior Panel removal to change a fuse. Easy installation, product has great great design features ,great customer service with prompt delivery. Just ordered the bracket (#18140) to secure the 4 prong plug to the hitch neatly and secure to eliminate the loose plug. (not shown in photos (Bracket in transit), 707901



- 118258
by:
2012 Hyundai Santa Fe

Easy install. Quality device. Couldn't be happier. The harness was easy as well and the "how to" video was perfect. 705621



- 118258
by:

Think this is even better than the previous version. Do have a question as the power/fuse tag specific a 10 amp fuse, but it had a 15 amp fuse installed. Is this CORRECT????? Also used 3M tape to secure it as it does not now include 2 sided tape. Works Great and Super Service. Was delivered as promised immediately after the hurricane!!! 700354


Comments
I have confirmed with my contacts at Tekonsha, and there was a slight design change. My contact explained that ether the 10 amp or the 15 amp fuse would work properly with the harness.
-- Rachael H - 09/24/2019

61474

- 118258
by:
2009 Hyundai Santa Fe

Both hitches and wiring harness fit like a glove, and installing was very easy. 698428



- 118258
by:

Ordered and received a trailer hitch and the wiring harness for my 2008 Hyundai Santa Fe. It arrived on the day they said it would and we got it installed within a few hours. No more borrowing a friends truck to tow my little trailer around. I am self sufficient once again - thanks. 692494



- 118258
by:

Every thing came as promised. Great company to work with. recommend to anyone 690557



- 118258
by:
2012 Hyundai Santa Fe

Product shipped quickly and fit as expected. There are other reviews showing that you do not have to completely disassemble the interior of the vehicle and this is correct. I plan on connecting and disconnecting the part as needed and this does not look like it will be an issue. 666882



- 118258
by:

Fast shipping, good price, and super easy to install ! 638764



- 118258
by:

Fantastic.... Great Quality and came as described. Will always have this company in my back pocket. Thanks 611184



- 118258
by:
2011 Hyundai Santa Fe

Ordered hitch assembly and light kit. Excellent communication and prompt delivery. Viewed installation videos. Perfect fit and exactly what I wanted. Highly recommend this product and seller. 602462



- 118258
by:

I haven’t installed this kit yet but delivery was fast! 574139



- 118258
by:
2010 Hyundai Santa Fe

Way better then factory 573039



- 118258
by:
2011 Hyundai Santa Fe

Once the end caps were removed, very easy to install. (could have had more info on removing end caps). 571275



- 118258
by:

Lot better than the factory product because the module is inside definitely thumbs up all together better 570723



- 118258
by:

Went in in less than 10 minutes, the right part, at the right time. ordered, shipped, and received in record time. 546028



- 118258
by:
2009 Hyundai Santa Fe

Painless to order. Quick delivery. Works as advertised. Decided to just hook it to the connectors, zip tie where convenient and remove the harness when not needed as opposed to removing panels etc. 519686



- 118258
by:
2009 Hyundai Santa Fe

Prefect fit went in easy only complaint would be that three wire ties weren’t enough used 4 more to make it snug had to scrounge for some double sided tape would have been nice to have everything I need to do the job. No big deal got the job done in about an hour and it works great 493840



- 118258
by:

Wiring harness is just fine. I made the mistake of buying this harness from a local professional shop. The installation was incorrect--I had taken with me a portable computer to show the video and to pull up copies of the directions but the professional would have none of it. The printed version of the instructions were adequate and coupled with the video was perfect. I did the install myself. I canceled the local shop and found etrailer. Even if you're a 70 year old lawyer with no experience with installing this harness, you will do better to handle this chore yourself. etrailer works. I know I should support the local places, but as time passes, I find myself doing on-line. Actually the people on-line are nicer. 486478



- 118258
by:
Hyundai Santa Fe

Instructions had me rip apart the back panel on my Hyundai Santa Fe. Wasted an hour. Not needed. I finally just went under the vehicle joined the two connections and secured the wires. 476087



- 118258
by:

The catalog and video were excellent on details and install information for the trailer harness. I received the order quickly and the install went smoothly. Very satisfied! 457814



- 118258
by:
2012 Hyundai Santa Fe

Easy install, good directions 457090



- 118258
by:
2012 Hyundai Santa Fe

Plug and play on my 2012 Santa Fe. I didn't take the car apart since the pig tails were hanging right behind the left rear wheel. Just plugged it in and on to install the 7 pin wiring! 444820


29
116
Show More Reviews

Ask the Experts about this Tekonsha Custom Fit Vehicle Wiring

  • 4-Way to 5-Way for 2020 Hyundai Palisade to Be Able to Tow Trailer With Surge Brakes
    Reverse lockout solenoids barely draw any amperage to activate so a reverse light circuit that uses LED lights like the 2020 Hyundai Palisade would not be an issue with a 4-way to 5-way adapter like the part # 20036. Now for the install it would be up to you how professional you want it to look but it's definitely possible to make it look professional. It would be just a matter of finding the reverse light circuit in the most convenient location to allow this happen and then taking the...
    view full answer...
  • Picking Out Trailer Wiring and Brake Controller for 2012 Hyundai Santa Fe
    The connectors you found do look like the standard trailer wiring connectors that your 2012 Hyundai Santa Fe would have if it has the factory tow package. I would be inclined to believe that the install harness part # 118258 is what you'd need but you might test the pins of the connectors for voltage with a circuit tester like part # PTW2993 to be sure. Otherwise you'd need to start with a 4-way kit # 118415 which actually fits either way so it is a safe bet regardless. The # ETBC7...
    view full answer...
  • 7-Way Trailer Connector Installation-2012 Hyundai Santa Fe
    To install a 7-way on your Santa Fe, the easiest way to proceed would be to first install a 4-pole connector, part # 118258. You can see the installation instructions and an install video by clicking the provided link. How you proceed from here will depend on what you're trying to do. If the trailer you're wanting to tow has a 7-way connector, but NO brakes you can simply use a # 37185 adapter. The adapter would plug directly into the 4-pole, and the white ground wire would ground to...
    view full answer...
  • Wiring Harness and Towing Setup Recommendation for a 2008 Hyundai Santa Fe
    If you do not have a tow package on your 2008 Hyundai Santa Fe, then you would have to contact a local Hyundai dealer to inquire about activating the tow package. There may be additional fuses and relays that would need to be installed by the dealership to activate the tow package. The trailer wiring harness, # 118258, that you referenced was designed for vehicles that came with the factory tow package. If the dealer is not able to activate your tow package, then you will want to use...
    view full answer...
  • Adding a 7-Way Trailer Connector to a 2009 Hyundai Santa Fe with 4-WayTrailer Connector
    In order to add a 7-Way trailer connector to your 2009 Hyundai Santa Fe on which you have already installed a 4-Way (118258) you have a couple of options. First, if you just want the basic lighting functions and nothing else then you would just need an adapter like # 37185. The 4-Way end will plug into this adapter, then you will ground the white wire to the frame and tape up and stow the other wires out of the way. If there are functions on the trailer like electric brakes and 12 volt...
    view full answer...
  • Correct Trailer Wiring Harness for a 2011 or 2012 Hyundai Santa Fe with Towing Package
    At this time the correct choice for the 2012 Hyundia Santa Fe SE with towing package is the Draw-Tite custom fit wiring, # 118258. Draw-Tite has tested this harness on the 2011-2012 models and verified that it will work without issue. I have attached a link to the installation instructions for you to review also. You should verify, with a circuit tester, # 40376, that the connectors on your Santa Fe are fully functional before purchasing the tow package wiring harness. If one or more...
    view full answer...
  • Trailer Wiring Recommendations for a 2011 Hyundai Santa Fe
    If your 2011 Hyundai Santa Fe does not have the tow package from the factory, you would need wiring harness # 118415. To be absolutely sure on whether or not the vehicle is so equipped, have the dealer run the VIN. They will be able to tell you what equipment it has with that information. As far as I have been able to find, the 2011 Hyundai Santa Fe, any model, was not equipped with a 7-Way. In order to add one, it would be a hardwire situation that would include adding a 4-Way first...
    view full answer...
  • How to Determine if a 2009 Hyundai Santa Fe has a Tow Package
    From the research I did the easiest way to determine if you have a tow package would be to check to see if your 2009 Hyundai Santa Fe has a transmission cooler mounted in front of the radiator. A transmission cooler looks basically like a miniature radiator that will be mounted in front of the radiator. If your vehicle has a transmission cooler then you know it has a tow package. You can also look under the driver side wheel well to see if the connections are there. Check out the video...
    view full answer...
  • 5-Way Trailer Wiring Harness Needed for Surge Brakes
    We do not have any plug-in style 5-wire harnesses, but you can use a 5-wire adapter like the Tow Ready 4 Pole to 5 Pole Adapter, # 20036, or the Hopkins 4 Pole to 5 Pole Adapter, # 47515. These adapter would require a 4-way wiring harness to be installed first, then the additional wire from the adapters would splice into your vehicles reverse light circuit to actuate a surge brake electric lockout.
    view full answer...
  • Testing the T-One Wiring Harness # 118258 on a 2009 Hyundai Santa Fe Limited
    Using a test light to test your T-One Wiring Harness, # 118258, on your 2009 Hyundai Santa Fe Limited is a fairly simply process. To test the trailer connector, you will need a circuit tester with an incandescent bulb like # 40376. These testers can also be found at many hardware or auto parts stores. I have attached a video of my coworker demonstrating how to test a 4-way trailer connector using a circuit tester for you to check out. When a vehicle comes with a tow package, it typically...
    view full answer...
  • Correct Wiring Harness to Provide a 4-Way Trailer Connector on a 2007 Hyundai Santa Fe LTD
    If your 2007 Hyundai Santa Fe has a factory tow package, you can use the Draw-Tite Custom Fit Vehicle Wiring, # 118258. The plugs you describe sound like the correct ones for this harness. According to our installers, the connection point is located underneath the vehicle, inside the lower body panels on the drivers side, next to the muffler. I have included close up images of the harnesses plugs below. If they look like a match with what you have found, then this is probably the correct...
    view full answer...
  • Trailer Wiring Harness Options for a 2011 Hyundai Santa Fe
    The Replacement OEM Tow Package Wiring Harness, # 118258, is designed as a replacement for a factory wiring harness and/or for those 2011 Hyundai Santa Fe models that have a towing package. If your Hyundai Santa Fe does not fall into this category then you need # 118415. If this does describe your Santa Fe, then you are correct, the connectors and converter are designed to remain in side the vehicle. The point at which the connectors are pushed through from the outside to the inside...
    view full answer...
  • Trailer Wiring Harness # 1182558 for Hyundai Santa Fe
    The Tow Ready T-One harness you referred to is a fit for the 2007-2012 Hyundai Santa Fe. The harness is designed to attach to two connectors located under the vehicle that are pinned to the underside of the vehicle behind the passenger side rear tire. The connectors are pushed back into the cargo area of the vehicle, where the T-One harness will plug into the connectors. The 4-pole trailer connector would then be pushed out through the hole to the outside that you pulled the connectors....
    view full answer...
  • Recommended Trailer Wiring Harness for a 2010 Hyundai Santa Fe with Factory Tow Package
    For the 2010 Hyundai Santa Fe with the factory tow package, you would need the Custom Vehicle Wiring Harness, part # 118258. The harness would plug into the connector that is located underneath the vehicle inside the lower body panels on the driver side next to the muffler. I would also recommend a mounting bracket, part # 18144, and it would be a good idea to use dielectric grease like part # 11755 between the connectors. The grease will protect the plugs from moisture and corrosion. For...
    view full answer...
  • Trailer Wiring Harness for a 2011 Hyundai Santa Fe GLS
    If the 2011 Hyundai Santa Fe came with a tow package, it should have already had a wiring harness. The Tow Ready harness # 118258 is a replacement. But, it is still possible for the vehicle to have the connectors for the harness. If the connectors you found are not matching up, it could be the wrong connectors and you will have to continue searching for the right ones. If the vehicle never had a wiring harness before, or you cannot find the connectors and what to try something else,...
    view full answer...
  • Installation of Draw-Tite Tow Package Wiring Harness # 118258 on a 2010 Hyundai Santa Fe
    The Draw-Tite Replacement OEM Tow Package Wiring Harness, part # 118258, is designed to connect to the trailer input connectors on the inside of the vehicle to protect the connection of the connectors and the Modulite converter box from the elements. The installation you have described will work, it will just not allow the protection of the converter box from the elements. You will want to make sure that you support the converter box and make sure none of the wiring harness will be damaged...
    view full answer...
  • Installing a Brake Controller on a 2010 Hyundai Santa Fe with Factory Tow Package
    To install the Tekonsha brake controller on your 2010 Hyundai Santa Fe, you will first need a 4-Way trailer connector if you do not already have one. The Tow Ready Custom Fit Vehicle Wiring, # 118258, that you have referenced will fit your Santa Fe if the Hyundai Santa Fe came with Factory Tow Package. If it did not, then use harness # 118415. I have included a link to the installation details below. I recommend switching the plug on the trailer from a 6-Square to a 7-Way. You can use...
    view full answer...
  • Can the Draw-Tite Wiring Harness # 118258 be Installed Outside of a 2012 Hyundai Santa Fe
    You are correct, the purpose of pulling the wires into the vehicle is to protect the converter box from the outside elements, but also to protect the T-connection points between the wiring harness and the vehicle connectors and to protect the in-line fuse on the wiring harness. I would recommend against leaving the entire wiring harness outside of the vehicle because of the many different parts that need to be protected from the outside elements and if any moisture enters the converter...
    view full answer...
  • Troubleshooting Trailer Wiring for 2007 Hyundai Santa Fe with No Power to Pins
    Is it factory trailer wiring or aftermarket? Most likely the converter box has an internal short now and is in need of replacing as this is the common problem. You can test the converter box but most likely it's time for new wiring with the part # 118258 which does have an inline fuse so if you had this kit you could check there if present. 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...
    view full answer...
  • 4-Way Trailer Wiring for a 2010 Hyundai Santa Fe with or Without a Factory Tow Package
    The plugs you found on your 2010 Hyundai Santa Fe sound like they go with the Draw-Tite T-One Vehicle Wiring, # 118258. After you remove those caps, they should look more like the connectors in 30159. If you found the plugs on the driver side near the muffler then this is the harness you need. If you are not certain you can have the dealer run the VIN to see if your Santa Fe has the factory tow package. If it does, those are the right connectors and the 30159 harness is the one you need. If...
    view full answer...
  • How to Determine Where to Drill Hole in Firewall of Vehicle to Install Brake Controller
    We haven't had the chance to install the Brake Controller install kit part # ETBC7 in a 2008 Hyundai Santa Fe so I don't have an exact location I can recommend for drilling the hole in the fire wall, but I can give you some guidance. Basically you will need to find a location that you can access reasonably on the vehicle interior side of the firewall and the side under the hood of your vehicle to drill the hole. Since it can be somewhat difficult to be certain you have found the same...
    view full answer...
  • What Size Fuse Does The Draw-Tite Custom Fit Vehicle Wiring # 118258 Use For 2008 Hyundai Santa Fe
    I walked out to the warehouse and pulled the Draw-Tite Custom Fit Vehicle Wiring # 118258. This wiring kit uses a 10 amp fuse in the yellow fuse holder. I have linked instructions for the Draw-Tite Custom Fit Vehicle Wiring # 118258.
    view full answer...
  • Parts Needed to Convert 4-Way of 2010 Hyundai Santa Fe to 7-Way and Install Brake Controller
    The adapter part number you need to convert your 2010 Hyundai Santa Fe's 4-way to a 7-way and install a brake controller is the part # ETBC7. This comes with everything needed to easily make the conversion and wire up a brake controller as well. I attached an install video for this kit that shows it install on a similar 2012 Hyundai Santa Fe for you to check out as well. For a brake controller the Draw Tite I Command part # 5535 is a really great option. It is a lower priced proportional...
    view full answer...
  • Comparison of Trailer Wiring Harnesses # 118415 and # 118258 for a 2009 Hyundai Santa Fe
    My preference between the two wiring harnesses for the 2009 Hyundai Santa Fe would definitely be to go with the Tow Ready # 118258, if the vehicle has a factory towing package. The other wiring harness, part # 118415, is for models that do not have the tow package. The Tow Ready wiring harness keeps as much of the harness and connections inside the vehicle as possible, keeping the 4-Way trailer connector and wiring safe and dry when not in use. You can view the installation instructions...
    view full answer...
  • Installation of Replacement OEM Tow Package Wiring Harness 118258 On a 2008 Hyundai Santa Fe
    I have attached an installation video of the # 118258 wiring harness on a 2009 Hyundai Santa Fe for you. The installation is pretty straight forward once you have gained access to the factory connectors. To do this, you are going to start by lowering the spare tire, and then you would open up the cargo area and remove the access panels, threshold trim, trunk floor panels and trays. Proceed by removing the trim panel on the driver side, but make sure you remove the fastener on the driver...
    view full answer...
  • Installing 5-Way Trailer Connector Adapter On My 2011 Hyundai Santa Fe w/ Tow Package
    First, if the trailer has electric brakes and you wish to use them using a brake controller, you will need a different set up with a 7-Way trailer connector. If the trailer has surge brakes and has an electric reverse lock out, then the 5-Way adapter would be correct and it will need to connect to a reverse light circuit. The wire that connects to the reverse light circuit does not have to be connected directly behind the reverse lights. You can trace the wires on the hatch and determine...
    view full answer...

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




  • Why etrailer.com?

    At etrailer.com we guarantee:
  • Highest quality custom fit vehicle wiring for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate custom fit vehicle wiring information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Expert Research:
Mike L
Expert Research:
Sarah L
Expert Research:
Robert G
Expert Research:
Michael H
Expert Research:
Jeff D
Expert Research:
Reno H
Expert Research:
Jameson C
Expert Research:
John H
Video Edited:
Zack K
Video Edited:
Mike H
Video by:
Joshua S
Test Fit:
Nicholas E
Updated by:
Sarah W
Updated by:
Alexander C
Updated by:
Isabelle 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.