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  1. Custom Fit Vehicle Wiring
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  4. Trailer Hitch Wiring
  5. 4 Flat
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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 # 118487
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Custom Fit Vehicle Wiring

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Tekonsha Custom Fit Vehicle Wiring - 118487
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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 118487 or order online at 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 (31)
  • Q & A (0)
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  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118487

  • 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.


  • 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 trunk
    • Plug in T-connector
    • Run hot lead to car battery
  • Includes ModuLite power module that 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


  • Maximum amperage:
    • Stop/turn lights: 2.1 amps per circuit
    • Tail lights: 5.6 amps per circuit
  • 1-Year limited warranty


This custom-fit T-One connector plugs into your vehicle's wiring harness, which is located inside your trunk, behind the tail lights on both the driver's side and passenger's side. You will need to remove some interior trim or carpeting to access the 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.

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

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 Power Module

A ModuLite power module is built into this T-One connector. 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.

118487 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

Installation Details 118487 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 - 118487

Average Customer Rating:  4.9 out of 5 stars   (31 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.

2018 Ford Mustang

Two local trailer dealers advised me that there was no wiring kit for my 2018 Mustang. I bought the kit from etrailer and it works fine. I was nervous about doing it myself because the dealer would not install it. I watched the videos and it was a very easy installation. Everything worked like in the video. I did make one change, I ran the power wire under the back seat to the passenger compartment. I then attached it to a 12 volt plug and hid the wires and plug under the passenger seat. When I use the trailer I plug it into the receptacle in the console. I was easier than running it under the car into the engine compartment.

2011 Ford Mustang

Fast shipping and everything was there that was needed, just a couple of plugs run a hot wire, worked perfect Thanks for a great product. Cherry


Only took a couple hrs to install, but my car was an exception. I have a 12 Boss 302 and it has corsa sports that had to be tack welded to keep from turning in the clamps at high rpm. So I managed to remove the hangers to drop the mufflers a bit and got it done. Not an easy chore but it's possible. Looks great on the car since it tucks up close to the rear bumper. Fish wires weren't to hard at all and went well getting them through.


the wiring harness is nice quality , easy to put on. The video on was very helpful for both the trailer hitch and wiring harness.

2014 Ford Mustang

The Sportframe hitch was quick to bolt up with the excellent fish wires. It actually took longer to install the wiring harness!

2017 Ford Mustang

Hitch came in very fast. Ordered two days before X-mas and it arrived on the 28th. Hitch and wiring are both as advertised. Giving four stars instead of five because it tore through the box and scraped some pain off a few places. Will update when installed

2016 Ford Mustang

I've been using this to haul my Kendon motorcycle trailer behind my 2016 Mustang GT convertible for about a year now and it's been working great. Haven't had any issues yet. Kit had enough wire and parts are holding up so far.

2010 Ford Mustang

The wiring harness was simple to install running the wire to the battery was the worst part of all. Excellent instructions

2013 Ford Mustang

I got the trailer hitch earlier than expected, all the parts were there , the photos to aid in the installation were very helpful and the price was very reasonable. Also the hitch when not in use is very low profile and not easily seen. Thanks E-Trailers!


Thank you for wonderful service and speedy delivery

Never got to install vehicle before I sold it. So I still have unable to use. It will not fit new car. But price and service were great
John d - 05/30/2018

2015 Ford Mustang

Fits 2015 Mustang GT convertible perfectly.
happy with the hitch and shipping.
I’ll buy from you again when needed.


Excellent Product! Watch the video and you should be more than fine. The kit comes with everything you need. It took me a little over 2 hours to complete the install but I guess that's what happens when you don't do these things for a living. Used it on my maiden voyage a 400 mile trip with no issues.


I had no problem installing the hitch but have not used it for any hauling yet.

2009 Ford Mustang

I have used your product before
It was
easy installation and was DYI easy project.
I would give it 5 stars out of 5

2012 Ford Mustang

Quick delivery. Easy installation


Cables were easy to install and included all the necessary hardware.


Great and timely transaction! I’d recommend e-trailer to anyone!

2013 Ford Mustang

Product was easy to install and working well, no problems.


Plugged in as advertised and is still working as expected.





Exactly what I needed, with fast delive ry!

2011 Ford Mustang

Fit is excellant

2012 Ford Mustang

Everything arrived as stated, no problems, very happy.

Show More Reviews

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

  • Ford Mustang 2010 Convertible Tow Ready T-One Connector
    The Tow Ready T-1 Connector # 118487 requires a connection to the battery in order to function properly. The T-1 receives the signals from its attachment behind the tail lights, but the voltage to power the trailer lighting is sourced directly from the battery. This is done to protect the circuitry in the vehicle wiring system. Drawing the power from a different 12-volt source can damage the electrical system in the event of a short circuit in the trailer wiring. I have ran the power wire...
    view full answer...
  • Will Installation of Trailer Wiring Harness Affect Sequential Turn Signals on a 2016 Ford Mustang
    The sequential turn signal feature on your 2016 Ford Mustang is controlled further up the line than where a trailer wiring harness such as # 118487 would install. The connection for the wiring harness is basically a pass-through device so the sequential signals coming through won't change how the vehicle turn signals function.
    view full answer...
  • Wiring 4-Way Trailer Connector with 5 Wires
    Do you have a 4-pin connector that has 5 wires or is it a 5-pin connector? There is a big difference since you normally see a 5-pin connector on a boat trailer with the 5th pin used for an electric reverse lockout solenoid on a brake actuating coupler. If it is a 4-pin connector with 5 wires then it is called a wishbone harness and would have 2 wires attached to the running light pin so you have one wire for each side of the trailer. Typically, on a 4-Way, the white wire is ground, brown...
    view full answer...
  • Will Tekonsha T-One Connector 118487 On 2018 Ford Mustang GT Change How Tail Lights Work?
    With the Tekonsha T-One Connector # 118487 installed on your 2018 Ford Mustang GT the inside lights on each side of your vehicle will not be at full brightness, and will only be at the dimmer brightness when your head lights are on. If you take a look at the 12:55 minute mark of the included video where Shane tests this harness, you will see exactly how the lights will look with each function.
    view full answer...
  • Taillight Signal Converter Recommendation for Adapting a US Vehicle to a Euro Trailer Wiring
    The note you mentioned for the # 118158 is for when it is used for flat towing. Since your plan is to use this adapter to make an adapter for towing a trailer you can disregard that. The # 118158 would be the correct adapter to use to convert your trailer taillight signals from combined to separate and would work with the # 118487. I attached a diagram that should be helpful for you as well.
    view full answer...
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  • Towing a Trailer with 2014 Mustang GT vs 1999 Honda Civic Coupe
    I did some checking in the the owners manuals for both the 2014 Ford Mustang GT and the 1999 Honda Civic Coupe for you. The owner's manual for the 1999 Civic Coupe instructs that the vehicle is not designed for and should not be used to tow a trailer. I was able to find the 3.7L and 5.0L Mustang have a maximum trailer weight capacity of 1,000 pounds. Per the owner's manual, the Shelby GT should not be used to tow a trailer. The biggest concern in towing with the Mustang will be ground...
    view full answer...
  • Using Hitch Adapter on Class I Hitch for Motorcycle Carrier on 2012 Ford Mustang
    You are correct that the only available trailer hitches for your 2012 Ford Mustang are Class I hitches that provide a 1-1/4 inch receiver opening. If you do not yet have a trailer hitch, I recommend the Draw-Tite Class I Sport Frame Receiver Hitch # 24863. This is custom fit for your vehicle and will use existing holes in the Mustang's frame for a no-drill installation. I have attached the written installation instructions that you can also take a look at. You can use an adapter like...
    view full answer...
  • Tips for Routing Trailer Wiring Harness Power Wire on a 2014 Ford Mustang Convertible
    There is no one specific way the power wire from a trailer wiring harness such as # C56088 or # 118487 has to be run on your 2014 Ford Mustang. It all depends on how you want to route the wire. I have included a link to a help article with tips on routing the power wire for you. You could follow one of those methods or use it as a guide to develop your own.
    view full answer...
  • Recommend Trailer Hitch for 2010 Ford Mustang V6 with Boss Rear Bumper
    For your 2010 Mustang V6, you will need the Draw-Tite Trailer Hitch, part # 24840. The hitch will bolt up to the frame of your Mustang, but since you have a Boss rear bumper, additional trimming of the bumper fascia may be required. The Draw-Tite Hitch # 24840 is a Class I 1-1/4 inch hitch. You will want to make sure not to exceed the towing and tongue weight capacity of the hitch or vehicle as stated in the vehicle owners manual. If you will be using the hitch for hitch mounted accessories...
    view full answer...
  • What is the Difference Between the Hidden Hitch and Draw-Tite Trailer Hitch for a 2011 Mustang GT
    The only difference between the Draw-Tite Sportframe Class I Trailer Hitch, # 24863, and the Hidden Hitch Class I Trailer Hitch, # 60280 (no longer available), is that the Hidden Hitch Trailer Hitch includes a ball mount. Draw-Tite and Hidden Hitch are sister companies that use the same design, specifications and materials for their products. The only advantage to purchasing one over the other is that you will get a ball mount with the Hidden Hitch trailer hitch. In this case you will...
    view full answer...
  • Will Draw-Tite Class I 1-1/4 Inch Hitch # 24863 Fit A 2011 Ford Mustang Convertible
    I spoke with my contact at Draw-Tite and they said that the Draw-Tite Class I 1-1/4 Inch Hitch, part # 24863, will fit a 2011 Ford Mustang convertible. This hitch has a gross towing weight capacity of 2,000 lbs. and a tongue weight capacity of 200 lbs. Some items you may need to complete your Class I towing setup are the Draw-Tite Ball Mount, part # 3594, the Tow Ready 2 Inch Hitch Ball, part # 19258, and the Tow Ready T-One Wiring Harness, part # 118487. I am including a link to the installation...
    view full answer...
  • Hitch Recommendation for a 2011 Mustang GT Convertible Calif Special
    For your 2011 Ford Mustang GT Convertible California Special I would recommend you get a Draw-Tite Hitch, part # 24863. This hitch is designed to work on all models of Mustangs including your Convertible California Special. The problem is in the rear fascia and exhaust, the California Special model uses a different rear fascia and exhaust that is not compatible with the Curt Hitch, part # C11061. I attached installation instructions for you to check out also. You may need the following...
    view full answer...
  • 2013 Ford Mustang Hitch Options
    If you have a 2013 Ford Mustang GT or Non GT convertible, you can use either the Draw-Tite # 24863 or the Curt # C11210. These will both give you the same capacity, but one I recommend more than the other. I recommend getting the Curt as it has a hidden cross tube. I don't like seeing the crosstube of hitch receivers on cars and especially on sports cars like yours. I highly recommend getting the Curt for that reason. For wiring, you can use the T-One Vehicle Wiring Harness with 4-Pole...
    view full answer...
  • No-Drill Trailer Hitch for a 2012 Ford Mustang 6 Cylinder Coupe
    The Draw-Tite trailer hitch, # 24863, will fit your 2012 Ford Mustang, 6 cylinder coupe. There is no drilling involved and you should not have to cut or trim anything to install the hitch on your Mustang. I have included a link to the installation instructions for you. If you will be doing some towing, the recommended ball mount is # 3594.For a 1-7/8 inch ball use # 19256 and for a 2 inch use # 19258. For trailer wiring, use # 118487. I have included a link to the instructions for the...
    view full answer...
  • Trailer Hitch for 2015 Ford Mustang GT
    There are indeed hitches available for the 2015 Ford Mustang GT. The best hitch for you will depend on what you're planning on using the hitch for. If you're just needing a hitch to serve as an attachment point for a bike rack or other hitch mounted accessory, I'd recommend the Draw-Tite Class I hitch # 24928. If you'll also be doing some light duty towing, you'd also need a ball mount, trailer wiring harness, part # 118487 and a 1-7/8 inch trailer ball, part # 19256 or a 2 inch ball,...
    view full answer...
  • Will Draw-Tite Trailer Hitch 24863 Fit a 2012 Ford Mustang Boss 302
    It sounds like you race your 2012 Mustang. Are you sure you want to add the additional 25 pounds? I know it isn't much weight but it could be the difference between a win and a loss! This question has come up before and Draw-Tite hitch # 24863 will fit the 2012 Ford Mustang Boss 302. The recommended ball mount is # 3594. For a properly sized ball use # 19256 for a 1-7/8 inch or # 19258 for a 2 inch. And for trailer wiring use harness # 118487. I have linked the hitch and wiring instructions...
    view full answer...
  • Availability of a Trailer Hitch and Wiring for a 2011 Ford Mustang GT
    I spoke with my contact at Draw-Tite and he stated that trailer hitch # 24863, will fit the 2011 Mustang GT. I have included a link to the installation details. If you plan on doing some towing the hitch does not come with the proper ball mount. You will need part # 3594. For a 1-7/8 inch ball use # 19256 and for a 2 inch use # 19258. For trailer wiring use # 118487.
    view full answer...
  • Hitch Recommendation for a 2011 Mustang GT with an April 2010 Build Date
    To avoid all of those fit issues that the early 2011 Ford Mustangs had I would recommend you use a Draw-Tite Trailer Hitch for the Ford Mustang, 2011, part # 24863. There have not been any fit issues with this hitch like some of the Curt hitches have had. There have been instances where there have been slight fascia deformation when used with this hitch, but when I spoke with my contact at Draw-Tite he informed me that this is most likely seen on the California-Special Mustangs You may...
    view full answer...
  • 2012 Mustang Trailer Hitch Availability
    We do offer several hitches that are confirmed as a fit for your 2012 Ford Mustang GT. I have provided a link for your reference that lists them. Of the options available I recommend the Draw-Tite Class I # 24863. Please keep in mind if you are using this for towing or hitch mounted accessories you need to use Class I compatible products. Please be aware that normally the GT models low slung rear fascia does require trimming, because a hitch needs clearance to be able to carry items at...
    view full answer...
  • Recommended Trailer Hitch For 2015 Ford Mustang GT Premium Convertible
    We have just what you are looking for. The trailer hitch I recommend for your Mustang is the Draw-Tite Sportframe Trailer Hitch, part # 24928. This is a Class l hitch and it has a 1-1/4 inch receiver opening. I called my contact at Draw-Tite and asked about the GT Premium Convertible model to see if there were any issues with a trailer hitch. They told me that the # 24928 is listed as a fit for all models. I have attached a link to an installation video for this hitch on a 2015 Mustang....
    view full answer...
  • Trailer Hitch and Wiring Recommendation for 2012 Ford Mustang V6
    The Draw Tite hitch part # 24863 is a confirmed fit for your 2012 Ford Mustang V6 and has a 2,000 lb towing capacity. As long as the owners manual of your vehicle states that you could tow a trailer that weight you'd be good. For trailer wiring I'd recommend the Tekonsha kit part # 118487 as it installs without splicing into the vehicle wiring and has the most reliable converter box of all of the kits we offer. For a ball mount you'd then want the part # 3594 and for hitch balls # 19258...
    view full answer...
  • Recommended Trailer Hitch Receiver for 2017 Ford Mustang with Quad Exhaust
    On your 2017 Ford Mustang with Quad Exhaust, there is no removal or modification of any panels when installing the Draw-Tite Trailer Hitch Receiver # 24928. You simply need to temporarily lower the exhaust so that you can access the bolt locations already present for this hitch installation. Then you reattach the rubber isolator hangers on your exhaust system and you are back on the road. I've attached a video to assist. If you will be towing with this hitch, I recommend the drawbar...
    view full answer...
  • Trailer Hitch for 2015 Mustang GT Convertable Premium with Manual Transmission
    We do offer a light-duty Class I hitch for the 2015 Mustang GT convertible, part # 24928 from Draw-Tite. This hitch is rated for a maximum of 2000-lbs of trailer weight. Towing also requires a wiring harness # 118487, a ball mount # 3594 and a hitch ball like 2-inch ball # 19258 or 1-7/8-inch # 19256. Please note that Ford specifies on page 180 of the online owner's manual that the vehicle can tow no more than 1000-lbs. A touring Harley can easily weigh well over 800-lbs. By the time...
    view full answer...

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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Joshua S
Video by:
Joshua S
Employee Michael B
Video by:
Michael B
Employee Nicholas E
Test Fit:
Nicholas E
Employee Shane H
Test Fit:
Shane H
Employee Jacob T
Video Edited:
Jacob T
Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
Updated by:
Alexander C
Employee Isabelle B
Updated by:
Isabelle B
Employee Cole B
Installed by:
Cole B

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