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  1. Custom Fit Vehicle Wiring
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  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 4 Flat
  6. Powered Converter
Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Item # HM11140314
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Custom Fit Vehicle Wiring

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Custom Fit Vehicle Wiring HM11140314 - Custom Fit - Hopkins
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Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring. Powered converter reduces strain on wiring system. 1-636-306-4830 to order Hopkins custom fit vehicle wiring part number HM11140314 or order online at Free expert support on all Hopkins products. Guaranteed Lowest Price and Fastest Shipping for Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (3)
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Hopkins Custom Fit Vehicle Wiring - HM11140314

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • Powered Converter
  • Hopkins

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring. Powered converter 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 behind tail lights
    • Plug in connector
    • Run hot lead to car battery
  • Includes a tail light converter 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
  • Protective connection terminals resist corrosion
  • Comes with dust cap for 4-way flat connector, cable ties, and terminal grease packet for electrical connections


  • Maximum amperage:
    • Stop/turn lights: 3 amps per circuit
    • Tail lights: 6 amps per circuit
  • 90-Day limited warranty


This custom-fit T-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 spare tire cover, interior paneling, and tail light assemblies to access this harness. Once you've plugged in the connector, run the red hot lead up to your car battery. Connect the included fuse holder, and then connect the fuse holder to the positive terminal on your battery.

T-One Connection Location Points Behind Tail Lights

Once installation is complete, the 4-way connector will be stowed beneath your vehicle, near the trailer hitch. A mounting bracket (sold separately) is recommended to keep the connector secure.

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.

Powered Tail Light Converter

A tail light converter is built into this T-connector. This converter is a battery-powered unit that bypasses the electrical routes that are used by a basic wiring harness. As a result, there is virtually no draw on your tail light circuits.

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 the trailer. This converter combines 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.

11140314 Plug-in Simple Hopkins T-Connector with 4-Pole Trailer Connector

Installation Details HM11140314 Installation instructionsAlternate Instructions HM11140314 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Video of Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Hopkins Custom Fit Vehicle Wiring - Trailer Hitch Wiring - HM11140314 Review

Today we're going to review part number HM11140314. This is the Hopkins plug in, vehicle specific wiring harness with the 4 pole trailer connector. This is a custom fit part number. This part number was designed to fit the 2011 to 2013 Lincoln MKX. This is a plug in wiring harness that will provide a no hassle, quick and easy way to install a 4 pole connector on your tow vehicle. This 4 pole connector here will plug in to the 4 pole on your trailer and provide power for the lights on the trailer. This plug in wiring kit will utilize the pre-wired factory OEM connectors, for a watertight protection and a guaranteed fit, and a very easy plug in installation.

These connectors right here will plug into the rear of your vehicle's tail lights. There's no cutting or splicing required. On the other end, where the 4 pole is, this 4 pole actually uses the nice, corrosion resistant terminals, and has a rubber dust cap that, when it's not being used, you could just put the dust cap on to also help protect it. Now, this part will include everything shown here on the table. It includes the power converter module, with everything attached to it. It includes this length of 14 gauge wire, which is used to attach the module to your vehicle's battery.

It comes with the fuse assembly, that would be attached to the power wire before it's attached to the battery, and the 15 amp fuse that get's installed right in this part, right here. It comes with a grounding screw, if it's needed to ground the white wire from the module, and it comes with some cable ties which could be used to take up any slack from this wire that's run from the back to the front of your vehicle. There's a little packet of dielectric grease, which is what you want to put on your 4 way before you connect it with the terminal from your trailer. That grease will help give you a nice, good, clean connection. The power converter module, right here, this will adapt the vehicle's wiring system to work with the trailer. It will safeguard the vehicle's wiring system, by pulling power for the trailer lights, directly from your vehicle's battery, so it doesn't go through the wires of the electrical system on your car, so it will protect your car's wiring system. Basically, when you go to install this, you'll go to the back of the car, and what you'll do is, you need access to the back of the tail lights, because that's where these will plug in. If you take the first section, this is with the yellow wires, this is for the driver's side, you just unplug the connectors on the rear of your tail lights, plug these into that, and then the connectors that are connected to this single green wire.

This is made to go across the vehicle to the passenger's side. You just plug these into the back of the passenger's tail lights, and then the two remaining wires, the white is for a ground. You want to get a good, clean ground to operate this, so they give you some length of white wire. There is an eyelet on the end. You can use an existing screw to tighten this down and get you a good, clean ground. If there's not an existing screw around, you can use the included grounding screw, and drill a hole, and use that to get a good, clean ground.

The last wire, this red wire with the butt connector, this is what will run to your vehicle's battery to supply the power to the module. What you'll do is take this length of 14 gauge wire. One end you'll hook to the butt connector here. The other end, you'll run this wire all the way up to the front of your vehicle. The other end, you'll attach to this fuse assembly. The other end of the fuse assembly, with the eyelet, will go onto the battery. Once those are all connected, just open up your fuse, put in the fuse right into there. Once it's installed, just close it. Then, your wiring harness will be ready to be used. Now, a few specs on this module itself. It has a maximum amperage that could be used on it. The stop and turn lights have a maximum of 3 amps per circuit to be used, and on the tail lights, 6 amps. That should do it for the review on part number Hm11140314, the Hopkins plug in, vehicle specific wiring harness with the 4 pole trailer connector. .

Customer Reviews

Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - HM11140314

Average Customer Rating:  4.7 out of 5 stars   (3 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring. Powered converter reduces strain on wiring system.


Thank u fast shipment


Great product, will be a repeat custome r!

2011 Lincoln MKX

Nice kit installed fairly easy. Thanks


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

  • Trailer Wiring Harness Options for a 2011 Lincoln MKX
    Curt trailer wiring harness # C56121 does indeed fit your 2011 Lincoln MKX. Installation will be the same as the video I have linked which features a 2013 MKX. We also have Tekonsha harness # 118519 or Hopkins harness # HM11140314 which also fit your MKX. They all install and function in the same manner but we do hear about fewer issues with the Tekonsha harness.
    view full answer...

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Info for this part was:

Employee Jeff D
Installed by:
Jeff D
Employee Laura H
Written by:
Laura H
Employee Alan C
Video by:
Alan C
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
Updated by:
Alexander C

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