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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 # HM11141820
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Custom Fit Vehicle Wiring

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HM11141820 - Powered Converter 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. 1-800-940-8924 to order Hopkins custom fit vehicle wiring part number HM11141820 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 (16)
  • Q & A (0)
  • Photos
  • Why etrailer?

Hopkins Custom Fit Vehicle Wiring - HM11141820

  • 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
    • 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 in your rear cargo area, on the driver's side and passenger's side. You will have to remove the rear threshold, cargo trays, and some interior lining/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 in 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.

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.

11141820 Plug-in Simple Hopkins T-Connector with 4-Pole Trailer Connector

Installation Details HM11141820 Installation instructionsAlternate Instructions HM11141820 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 - HM11141820

Average Customer Rating:  4.8 out of 5 stars   (16 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.

2015 Toyota RAV4

Fast accurate delivery of hitch and wiring harness. These folks do business the right way.

2013 Toyota RAV4

I am very pleased with the products that I received! Everything arrived in great shape, and was fairly easy to install!


Everything worked out perfectly. A YouTube video was helpful in the installation. I purchased a circuit tester to help confirm the installation.

Toyota RAV4

Everything was included that was needed. Had to use YouTube to find exactly how to install the wiring in my Rav4.


Product was a "plug & play" operation. It is functing very well from the day it was installed.


Well put together. Good instructions. Does what is supposed to.

2014 Toyota Avalon

All items were as vendor claimed (matched wiring for my Avalon). Items were easily installed with excellent fit. They were shipped in a timely manner and arrived accordingly. This vendor fits the characteristics of great customer service (quality, price, service). Excellent follow-up w/ customer.

2013 Toyota RAV4

Fits great, easy install




Good communication with seller.


Work very well I was very happy will it






Ask the Experts about this Hopkins Custom Fit Vehicle Wiring

  • Connecting Wiring Harness to Battery of 2018 Toyota RAV4 Hybrid
    Though I would not be able to speak for anyone else I believe that what you saw was probably referring to connecting the 12 volt hot lead to the auxiliary battery on a hybrid. However, it is strongly recommended when installing Vehicle Wiring Harness # HM11141820 on your 2018 Toyota RAV4 hybrid to the main battery in the front of the vehicle.
    view full answer...
  • Recommended Trailer Hitch for a 2018 Toyota RAV4 Hybrid
    Yes, we do. I recommend the Draw-Tite, part # 76134. It's a fit for all of the 2018 RAV4's including the Hybrid model like you have. I like how the crosstube is hidden behind the RAV4's bumper and all you see is the receiver tube sticking out. Take a look at the picture I attached. I've also linked the install video for you, which isn't on a Hybrid model but the install is the same. The wiring harness # HM11141820 from Hopkins gives you a 4-way to power the trailer lights. It plugs...
    view full answer...
    Image 1 for
  • Tekonsha Wiring Harness Over a Faulty Hopkins Harness on a 2018 Toyota RAV4
    The Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector item # 118578 for the 2018 Toyota RAV4 is for the highest amp capacity. You may have purchased the wrong wiring harness for your vehicle which is why it eventually blew out the control module. Or it could've just failed because of a faulty part. I recommend Tekonsha because their wiring harnesses have proven to be the most reliable in the towing industry. The wiring differences will make no difference in the operation...
    view full answer...
  • Brake Controller and 7-Way Trailer Connector Installation on 2015 Toyota RAV4
    In order to install your brake controller in your 2015 Rav 4, you'll need to first install a functional 4-pole connector like the # HM11141820. Once the connector's in place, you can continue the installation using our Brake Controller Install Kit, part # ETBC7. The Toyota RAV4 isn't set up for a plug and play brake controller installation. The ETBC7 kit contains an adapter to convert the 4-pole to a 7-way trailer connector, along with all the wire, hardware, connectors and circuit breakers...
    view full answer...
  • 4-Pole Trailer Wiring Harness for 2003 Toyota Avalon That Does Not Require 12V Power Connection
    Many vehicles like your 2003 Toyota Avalon are specified to use only a powered (or active) trailer lighting harness such as the four shown on the link provided, one of which is the Curt # C59236. The Hopkins harness # HM11141820 that you referenced also requires a 12V power connection to the vehicle battery, but note this harness is not a fit for your 2003 Avalon. The reason that only powered harnesses are offered for your car is that the wiring in the vehicle is not heavy enough to handle...
    view full answer...
  • Can a 2018 Toyota RAV4 Carry a Powered Wheelchair on a Trailer Hitch
    From my research your 2018 Toyota RAV4 has a maximum towing capacity of 3,500 pounds if you have the tow package with All-wheel drive. If you have the tow package with 2-wheel drive then it drops to 2,900 pounds and it drops to 1,500 pounds if you don't have the tow package at all. The tongue weight should also be between 9 to 11 percent of the trailer's weight according to Toyota so your numbers are 385 pounds, 319 pounds, and 165 pounds respectively. Additionally I found that if you...
    view full answer...
    Image 1 for
  • Recommended Trailer Hitch for 2018 RAV4 Hybrid SE
    The Curt hitch, part # C11375, is designed specifically for the Scion tC. It won't fit your 2018 Toyota RAV4 hybrid but we do have hitches that will. Out of all of them I recommend the Draw-Tite Class III, part # 76134. A Class III hitch is 2 inches and has a much higher capacity than the Class I you were looking at. There's also a much larger variety of accessories that fit. If you're going to be towing a trailer with your RAV4 you also need a ball mount. I've linked our selection...
    view full answer...
  • Recommended Wiring Kit for Towing with a 2017 Toyota RAV4
    Out of the Curt # C56350, Tekonsha T-One # 118578, and Hopkins # HM11141820 wiring harness kits for your 2017 Toyota RAV4 Hybrid I highly recommend going with the T-One option. The reason being that we have found the Tekonsha electronic equipment to last longer and work better than many other brands. The installation is fairly simple and only requires you to plug in the T adapters behind the tail lights, grounding a wire, and then run a hot lead up to the battery. I have attached a video...
    view full answer...
  • Troubleshooting Failed Hopkins Powered Taillight Converter 46255 in 2013 Toyota RAV4
    The Hopkins 4-pole harness we offer for your RAV4 is part # HM11141820 and this installs by plugging in at your taillight wiring connectors and via a single 12V power wire connection at your vehicle battery. If your vehicle taillights failed after these harness installations this suggests a problem in the converter module itself or a short in the connectors/wiring between the vehicle and the module. The good new is that the unit did what it was intended to - fail before it allowed any damage...
    view full answer...
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Info for this part was:

Employee Jeff D
Installed by:
Jeff D
Employee Jacob T
Video Edited:
Jacob T
Employee Chris R
Video Edited:
Chris R
Employee Adam R
Expert Research:
Adam R
Employee Kathleen M
Video by:
Kathleen M
Employee Alan C
Video by:
Alan C
Employee Jonathan Y
Video by:
Jonathan Y
Employee Laura H
Written by:
Laura H
Employee Alexander C
Updated by:
Alexander C
Employee Robert C
Test Fit:
Robert C
Employee Ryan G
Test Fit:
Ryan G

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