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T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Tow Ready Custom Fit Vehicle Wiring

ratingratingratingratingrating (2 reviews)

Code:   118487



Shipping Special

Shipping Weight: 2 pounds


Tow Ready Custom Fit Vehicle Wiring - 118487

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

This Product Fits The Following Vehicles

2010 - 2014 Ford Mustang

2011 - 2014 Ford Mustang All Models except GT

2012 - 2014 Ford Mustang GT models

2011 - 2011 Ford Mustang GT models- Convertible

2011 - 2011 Ford Mustang GT models- Coupe

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Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118487

Average Customer Rating:  ratingratingratingratingrating5.0 out of 5 stars   (2 Customer Reviews)

- 118487

ratingratingratingratingrating by: Donald L12/08/2013

Is this review helpful?

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!109544

- 118487

ratingratingratingratingrating by: Scott W08/02/2012

Is this review helpful?

Everything arrived as stated, no problems, very happy.50268

Ask the Experts about this Tow Ready Custom Fit Vehicle Wiring
Expert Answers about T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118487                                            Do you have a question about this Custom Fit Vehicle Wiring?

  • Trailer Hitch and Trailer Wiring Recommendation for a 2011 Ford Mustang V6 Convertible
  • For your 2011 Ford Mustang Convertible, you can use Curt Trailer Hitch, # C11048. This trailer hitch comes with the required ball mount and you can use ball # 19256 (1-7/8 inch diameter) or # 19258 (2 inch diameter). If you plan on ever using the hitch for a non-trailer load like with a bike rack or cargo carrier, Curts warranty requirements state that for their class I and II hitches, you must use a stabilizing strap like # 18050. For trailer wiring, you will need to use the Tow Ready Custom
    view full answer...

  • 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 wit
    view full answer...

Info for this part was:

Photos by:
Theodore B

Expert Research:
Michael L

Expert Research:
Michael H

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