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  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
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Custom Fit Vehicle Wiring

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HM11143165 - Custom Fit Hopkins Custom Fit Vehicle Wiring
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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 HM11143165 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.
  • All Info
  • Reviews (7)
  • Q & A (0)
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  • Why etrailer?

Hopkins Custom Fit Vehicle Wiring - HM11143165

  • 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 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

Customer Reviews

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

Average Customer Rating:  4.7 out of 5 stars   (7 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.


Great fit and easy to install. etrailer 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. etrailer harness was a better fit than the factory Mazda harness, thanks again etrailer!

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)

2010 Honda Civic

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


great purchase

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.




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

  • 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 Hybrid 2013...
    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...
  • What Size Power Feed Wiring Is Used On the Hopkins HM11143165 Wiring Harness?
    The power supply line in the Hopkins Plug-In Simple Vehicle Wiring Harness # HM11143165 will be 12 gauge wire. It will also include a 15 amp fuse with holder to make sure too much power does not get to the tail light converter/powered module. Though we do not have an install video of this as of yet, I did include a review we did for you to check out.
    view full answer...
  • 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...
  • 2016.5 Mazda CX-5 Mid-Year Trailer Hitch Recommendation
    That is a great question and thankfully easily answered. Mazda increased the level of standard equipment offered and labeled the upgraded vehicles as 2016.5 models. This was not a platform change, simply onboard equipment; the trailer hitches are the same for each. Our fit guide matches the vehicle manufacturers identification but if you look at the actual item listed it is the same for "prior to..." and "mid-year model". I recommend the Curt # C13315, this hitch is a confirmed to...
    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...
  • Recommended Trailer Wiring Harness for 2015 Mazda CX-5
    All of the wiring harnesses available for the 2015 Mazda CX-5 with incandescent lights are going to be fairly similar in terms of installation with one exception; the Curt # C56011 does not have a powered converter so there is no connection to the battery required. The Tekonsha # 118563 and Hopkins # HM11143165 come with a powered converter box. What this does is limit the power draw through the tail light wiring to better isolate the tow vehicle wiring and trailer wiring. So if there is...
    view full answer...
  • What Is The Height Of the Draw-Tite Receiver # 24899 From The Ground on a 2013 Honda Accord Sedan?
    The Draw-Tite Sportframe Trailer Hitch Receiver # 24899 measured in at 10" to the top of the receiver from the ground when we installed it on a 2013 Honda Accord sedan at our shop. Be aware that this height can vary slightly as suspension systems do tend to sag over time. I have linked a video below that will help you see where this is measured from as well as what is involved for the installation. Also the hitch distance from the center of the pin hole to the rear of the bumper is 2"....
    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...

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Info for this part was:

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

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