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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 # HM11143495
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Custom Fit Vehicle Wiring

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Custom Fit Vehicle Wiring HM11143495 - 4 Flat - 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. 1-800-940-8924 to order Hopkins custom fit vehicle wiring part number HM11143495 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 (8)
  • Q & A (0)
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Hopkins Custom Fit Vehicle Wiring - HM11143495

  • 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
  • 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 rear threshold, some interior paneling, and the 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 flat connector will be stowed in your rear cargo area.

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.

11143495 Plug-in Simple Hopkins T-Connector with 4-Pole Trailer Connector

Installation Details HM11143495 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 - HM11143495

Average Customer Rating:  4.9 out of 5 stars   (8 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.


Received the wrong wiring harness. The one I first received was for the Sienna SE, not the XLE. Costumer service sent me the return label and the correct wiring harness. Once I received the correct one the hardest part was finding a good ground. I think I wired it to the jack mount and put the control box in the same cavity. The wires come out of the hole in the plastic next to the trunk latch. It works great!

2018 Toyota Sienna

Order arrived before the due date, was very well packaged, no damage to anything,am very impressed!! Thank you!!!


Great product

Working great. No problems.
Ralph - 02/28/2022


Very knowledgeable and excellent service. I would definitely recommend it to my friends.

2017 Toyota Sienna



2019 Toyota Sienna



Ask the Experts about this Hopkins Custom Fit Vehicle Wiring

  • How To Choose Correct Trailer Wiring Harness for a 2017 Toyota Sienna
    There are several trailer wiring harness options for a 2017 Toyota Sienna. The first thing you need to do to find the correct one is identify the trim package, if it's an SE then this will further narrow down the selection as there are harnesses specific to this package. The next thing you will need to do is determine what type of trailer connector you need, 4-way is most common but there are also 7-way options for trailers with brakes. With all that in mind, there are multiple options...
    view full answer...
  • Recommended Trailer Wiring Harness For A 2012 Toyota Sienna XLE
    The Hopkins # HM11143495 that we have available for a 2012 Toyota Sienna is designed only to fit the SE (Sport Edition), so I will need to steer you in a different direction, unfortunately. For your XLE (Executive Luxury Edition), I recommend going with the Tekonsha T-One Vehicle Wiring Harness # 118498. This will need one wire run up to the battery for needed power, but other than that it will be a relatively quick plug and play option. I have found Tekonsha wiring harnesses to be the...
    view full answer...
  • Recommended Wiring Harness for a 2015 Toyota Sienna
    If the Hopkins # HM11143495 isn't matching the plugs on you 2015 Sienna, it may be due to this only fitting the SE trim package. If you do not have the SE trim package, you will need the # HM43494. That being said, I did include pictures of the plugs for you to double check and make sure they do match.
    view full answer...
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  • Can Trailer Wiring 4-Way Connector be Mounted Next to Receiver on 2011 Toyota Sienna
    You can definitely route the 4-Way from the Hopkins Plug-In Simple Vehicle Wiring Harness # HM11143495 through the grommet on your 2011 Toyota Sienna so that it can be mounted near the hitch receiver on your vehicle. I prefer to have it mounted by the receiver for easier access, but if someone doesn't do much towing then storing the connector in the rear cargo area of the van will keep it safer from the elements. To keep the 4-Way hanging near the receiver you can use the Mounting Box...
    view full answer...
  • Trailer Wiring Harness Recommendations for a 2012 Sienna XLE AWD
    Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector, # C56106, is a fit for your 2012 Toyota Sienna. You can also use T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118498 or Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # HM11143495. All of them install and function the same way. I prefer # 118498 because we hear about less issues with the Tekonsha brand. I have linked a video showing an example installation...
    view full answer...
  • Parts Needed to Install Hopkins Brake Controller in 2019 Toyota Sienna Without Tow Package
    Your 2019 Toyota Sienna is absolutely compatible with the Hopkins Agility Trailer Brake Controller # HM47294. Since you do not have the tow package you will need to add the wiring to allow you to use the brake controller; please note that the correct 4-way will depend on your Sienna's model as there is a version for SE models and for non-SE models. The parts you need are the following: - 4-Way (Non-SE Models): Hopkins Plug-In Simple Vehicle Wiring Harness # HM43494 OR - 4-Way (SE Models):...
    view full answer...
  • Do All Trailer Wiring Harnesses for 2011 Toyota Sienna Store in Rear Cargo Storage
    Each of the trailer wiring harnesses that fit your 2011 Toyota Sienna are designed to store in your trunk/rear storage area when not in use - the Hopkins Vehicle Wiring Harness # HM11143495 and T-One Vehicle Wiring Harness # 118498. You may be able to fabricate a way to route it under your Sienna but I recommend leaving it in the trunk area. The harness won't be harmed at all while using it when it's sticking out of the trunk. Then for a trailer hitch, you will want a Draw-Tite, and you...
    view full answer...
  • 2018 Toyota Sienna SE 7 Pole Trailer Wiring
    You have a couple options for your 2018 Toyota Sienna SE, the one that I recommend is getting the Hopkins wiring kit # HM11143495 because it will work with the SE SUB model Sienna. The kit you were looking at # TK87FR is not supported by the SE model. Yes, the Hopkins kit is just a 4 pole connector, but your can get an adapter like # 30717 you will be ready to haul! If you wanted to go the universal route, get the Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way...
    view full answer...
  • Does Draw-Tite Trailer Hitch Receiver 76112 for 2014 Toyota Sienna Have Tab for 7-Way
    There is a tab that will allow you to attach a 7-way connector on the Draw-Tite trailer hitch receiver that fits your 2014 Toyota Sienna, the Draw-Tite Trailer Hitch Receiver # 76112. This will allow you to attach a 7-way for use when towing a trailer with electric brakes, and to add that to your Sienna you will need the Hopkins Plug-In Simple Vehicle Wiring Harness # HM11143495 with the Universal Installation Kit for Trailer Brake Controller # ETBC7. You can then use a brake controller...
    view full answer...

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Edited by:
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