1. Custom Fit Vehicle Wiring
  2. Hopkins
  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 # HM11143165
lowest price pledge
Our Price: $85.61
You Save: 9%
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: 1.43 lbs
In Stock
HM11143165 - Custom Fit Hopkins Custom Fit Vehicle Wiring
zoom in 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

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. Call 800-298-8924 to order Hopkins custom fit vehicle wiring part number HM11143165 or order online at etrailer.com. 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.
  • All Info
  • Reviews (4)
  • Q & A (5)
  • Videos (1)
  • Photos
  • Why etrailer?

Hopkins Custom Fit Vehicle Wiring - HM11143165

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

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 in rear cargo area
    • Plug in connector - no cutting or splicing
    • 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
  • 90-Day limited warranty


This custom-fit T-connector plugs into your vehicle's wiring harness, which is located in your rear cargo area on the driver's side and passenger's side. You will have to remove the rear threshold cover, cargo trays, and some interior paneling 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.

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.

11143165 Plug-in Simple Hopkins T-Connector with 4-Pole Trailer Connector

Installation Details HM11143165 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 Review of Hopkins Custom Fit Vehicle Wiring - Trailer Hitch Wiring - HM11143165

Customer Reviews

Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - HM11143165

Average Customer Rating:  4.5 out of 5 stars   (4 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.

- HM11143165
2015 Honda Civic

Have not used it yet, but it appears to be all Rose said it would be. It looks impressive and totally functional. 522532

- HM11143165
2016 Mazda CX-5

Mostly just fine, but 4-way plug lead was not long enough. Connection too tight (not enough slack) out to trailer plug. Why be "chintzy" cheapskakes- just add some more plug wiring for a few cents more cost, for this essential component. (re: 2016 Mazda CX-5) 566359

- HM11143165

Great fit and easy to install. E Trailers has always been a go-to for all of my wiring needs. Mazda taillight bulb sockets don’t have the best fit and needed to be ‘worked’ around to ensure both running lights and brak lights functioned properly. E Trailer harness was a better fit than the factory Mazda harness, thanks again E Trailer! 772438

- HM11143165
2010 Honda Civic

The e-trailer hitch was easy to install with your wonderful info video. Very well made and works great. 603846


Ask the Experts about this Hopkins Custom Fit Vehicle Wiring

  • Trailer Wiring Harness for 2010 Mazda 3 Without LED Lights But Trailer Does
    You are correct that the wiring harness designation has to do with the vehicle lighting and not the trailer lighting. This has to do with the source power coming into the converter. Since you don't have LED's in your 2010 Mazda 3, I recommend the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118420. This will connect perfectly with your car and will not have issue with a trailer that uses LED lights. I've attached a video of this installation to assist.
    view full answer...
  • Does Hopkins Trailer Wiring Kit HM11143165 Fit 2016 Mazda CX-5 Grand Touring
    The Hopkins trailer wiring kit part # HM11143165 is a confirmed fit for your wife's 2016.5 Mazda CX-5 Grand Touring. It works for both the early and late models of the 2016 CX-5.
    view full answer...
  • Wire Gauge is the Wire That Runs to the Battery for the Hopkins # HM11143165
    The red wire that you run from the Hopkins # HM11143165 to the battery on your 2016 Mazda CX-5 is a 12 gauge wire. If additional wire is needed you can order it by the foot with part # 12-1-1.
    view full answer...
  • What Vehicles Does Hopkins Trailer Wiring HM11143165 Fit
    The Hopkins wiring harness part # HM11143165 fits quite a few vehicles including your 2016 Mazda CX-5. Here's full list of vehicles it fits: 2011 - 2014 Mazda 2 2004 - 2005 Mazda 3 2016 - 2016 Mazda CX-5 2007 - 2013 Honda Fit 2008 - 2012 Honda Accord Coupe 2013 - 2015 Honda Civic Coupe - excluding Si 2013 - 2015 Honda Civic Coupe - Si models 2013 - 2015 Honda Accord Coupe - without LED Taillights 2008 - 2012 Honda Accord Sedan 2006 - 2015 Honda Civic Sedan - excluding Si and...
    view full answer...
  • Towing a 520 lb Lawn Tractor on 2015 Honda Accord
    I took a look at the owner's manual for your 2015 Honda Accord and it said you could tow a trailer so long as the total load was a maximum of 850 lbs for a couple and 1,000 lbs for a sedan version. So as long as your combined weights were under that it would be safe. To do this you need a trailer hitch and the Draw-Tite # 24899 is a fit for either the sedan or coupe version of your '15 Accord. You also need wiring to add a 4-flat to your Accord and power your trailer's lights, part...
    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:

Edited by:
Lindsey S
Expert Research:
Jameson C
Video Edited:
Joshua S
Video Edited:
Jacob T
Video Edited:
Chris R
Installed by:
Kathleen M
Installed by:
Cole B
Written by:
Alexander C

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.