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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

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Custom Fit Vehicle Wiring

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Hopkins Custom Fit Vehicle Wiring - HM11141824
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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 HM11141824 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 (19)
  • Q & A (0)
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Hopkins Custom Fit Vehicle Wiring

  • 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 - 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


  • 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 tail light assemblies 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.

T-One Connection Location Points Behind Tail Lights

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.

11141824 Hopkins Plug in Simple Vehicle Wiring Harness with 4 Pole Trailer Connector

Replaces 11141785

Item # HM11141824

Installation Details HM11141824 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 - HM11141824

Average Customer Rating:  4.8 out of 5 stars   (19 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.


Local shop basically required I have "the wiring kit with the factory connectors" and was easily able to install this for me cleanly for $[XX] with my hitch. Worked great on my 2017 Mazda 3 2.5 touring


Good quality and worked out pretty well. You'll need more zip ties but that's typical of kits. Only one complaint; the green wire to the passenger side comes up about 6" too short on a 2017 mazda 3 hatchback, to mount on the fender with the sticky back. I zip tied it to some other wiring

2008 Toyota Camry

delivery was OK a little slow



2007 Toyota Camry

Finally a harness that fits! You guys are great. Installation was a breeze. The only thing I did differently was to put the power wire in a 1/4 plastic conduit. The 07 Camry had many drain plugs to allow easy access to the trunk area. These plugs were then sealed with a marine silicone.

The harness is still powering my trailer lights!
Paul K - 06/10/2021

2015 Toyota Corolla

Shipping was prompt and the product was exactly as described. It worked like a charm.


Great and easy to install. Had no complications with the plugs that went into the tail lights. Ran the hot wire to the battery with the in line fuse and has worked great.


Very easy to install great guide


Arrived on time with hitch


all good


Did the install myself and had no problems. Everything works great!



2015 Toyota Camry


2017 Toyota Camry


Very prompt service!

2008 Toyota FJ Cruiser



Works great!


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

  • Can a Wiring Harness be Used With a 2008 Mazda Miata?
    You are not missing any success stories regarding the Hopkins Wiring Harness # HM11141824 from customers with a Miata, it is likely because the vehicle is not made for towing. I took a look at the owner's manual for a 2008 Mazda MX-5 Miata, and the trailer towing section reads "Never tow a trailer with your Mazda MX-5." It may not seem like a particularly dangerous thing to haul a small cargo trailer, but the weight adds stress to your Miata that it was not designed to handle. This could...
    view full answer...
  • Trailer Wiring Recommendation for 2018 Mazda 3
    The two harnesses you mentioned are made by two different companies which have different fit lists for the 2018 Mazda 3. The part # 118405 has been confirmed as a fit for the Sedan models but not hatchback whereas the Hopkins kit part # HM11141824 fits all models of the 2018 Mazda 3. It's also the only custom fit option that does this so it would be your best option.
    view full answer...
  • Comparing Curt and Hopkins Trailer Wiring Harnesses for 2015 Mazda Miata MX-5
    There are definitely pros and cons to the two trailer wiring options you have for your 2015 Mazda MX-5. The Hopkins part # HM11141824 costs a bit more, has a more involved install, BUT once installed is the better choice as it's powered converted box allows the trailer lighting to draw it's power straight from the vehicle battery and not the taillight circuits. This gives you some peace of mind. The Curt # 56082 costs less and install a bit easier but since it draws power from the vehicle...
    view full answer...
  • 4-Way Trailer Wiring Kit Recommendation for 2009 Mazda MX-5
    A 6-pole flat connector is not a common style of trailer wiring connector so we do not have any adapters to go from a 4-way to a 6-pole flat. Best option would be to install the Hopkins trailer wiring kit part # HM11141824 and then remove the 6 way and install a 4-way in it's place with the part # HM38134.
    view full answer...
  • Why Does Trailer Wiring Connectors for 2009 Toyota Camry Not Match Taillight Connectors
    You didn't mention whether your 2009 Toyota Camry is a Hybrid model or not, but the part # HM11141795 that you referenced is for the Hybrid models only. Which if yours was a non-Hybrid you'd want the part # HM11141824 which seems to be the issue you are experiencing since this kit uses 2-pin connectors like what you said you have and the # HM11141795 has 4 like what a Hybrid would require.
    view full answer...
  • Plug-In Trailer Wiring Harness for a 2016 Mazda 3 Sedan without LED Tail Lights
    For a 2016 Mazda 3 Sedan without LED tail lights you can use # HM11141824 which plugs in line with the vehicle tail light wiring so you won't have to splice wires like you would with some of the other options. I cannot recommend using a wiring harness that the manufacturer states not to use so it would be best to replace the harness you have with # HM11141824.
    view full answer...
  • Trailer Wiring Harness for a 2015 Mazda 3 Hatchback without LED Tail Lights
    Hopkins does list wiring harness # HM11141824 as a fit for the 2015 Mazda 3, hatchback or sedan, with or without LED tail lights. There is another option that is universal but does not require splicing. It is the ZCI harness # 119250KIT and it has connectors that clamp around the vehicle tail light wiring to sense the electricity flowing through. What makes this such a great option, besides the fact that you won't have to splice, is that you can use it on many vehicles. So if you changed...
    view full answer...
  • Does Hopkins 4-Way Wiring for 2017 Toyota Corolla Supply Enough Power for Trailer Lights
    The Hopkins Plug-In Simple Vehicle Wiring Harness # HM11141824 or your 2017 Toyota Corolla will be able to provide enough power for your trailer lights. The only exception is if your trailer has a crazy amount of lights on it. In that case you would need to disconnect some of those lights because no trailer connector is rated for an excessive amount of lights. To mount this connector near your hitch receiver I recommend using the Tow Ready # 18144 along with the Curt # C57202.
    view full answer...
  • Recommended Trailer Hitch and Wiring for 2019 Toyota Corolla
    The Curt Class I Trailer Hitch # C11265 and the Draw-Tite # 24913 for your 2019 Toyota Corolla are indeed extremely similar hitches but I recommend the Curt # C11265 for a couple of reasons. Both hitches will install at the same location on your Corolla but the Curt receiver will be just a bit more recessed behind the bumper allowing for a cleaner appearance. Unlike the Draw-Tite hitch, the Curt is also made right here in the USA so you can be certain of its quality and strength. I...
    view full answer...
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  • Differences in Trailer Taillight Wiring Harnesses Available for 2015 Mazda 3
    The Curt # C55567, Tekonsha # 118405 and the Hopkins # HM11141824 all serve the same function, and would all install in the same manner. The Hopkins and Curt models have a very slightly larger amp capacity for the stop/turn lamp signal at 3A per circuit versus the 2.1A per circuit offered by the Tekonsha model. All three harnesses are a fit for all models of the 2015 Mazda 3. Typically, I'd recommend the model with the highest capacity, but not in this case. We've found that the Tekonsha...
    view full answer...
  • Recommended Tow Package for 2018 Mazda 3 Sedan
    To set your 2018 Mazda 3 up for towing a light trailer you will need a trailer hitch, wiring harness, ball mount, and hitch ball. Starting with the hitch I recommend the Draw-Tite Sportframe Trailer Hitch Receiver # 24912 because it offers the easiest install process that doesn't require any modification to the underbody trim panel on your vehicle like with the other available option. It is a Class I hitch that features a 2,000 pound towing weight capacity and will provide you with a...
    view full answer...
  • Recommended Towing Set Up for 2018 Mazda 3
    We have towing components you can add to your 2018 Mazda 3 though I did take a look at the owner's manual and it stated that you should not tow a trailer with your vehicle so doing so would be at your own risk. If you do decide to tow you need to start with a trailer hitch, either the Draw-Tite # 24912 if your '18 Mazda 3 is a sedan or the Draw-Tite # 24914 if your Mazda is a hatchback; these are the best option because they will be the easiest to install. The ball mount that Draw-Tite...
    view full answer...
  • What Hitch Fits a 2016 Mazda 3 Hatch i-Touring
    When it comes to "Vehicle Style" in our fit guide, there are 4 options in the drop down menu for a 2016 Mazda 3 - "Hatchback - with LED Taillights", "Hatchback - without LED Taillights", "Sedan - with LED Taillights", and ""Sedan - without LED Taillights". Since you mentioned your Mazda was a Hatch i-Touring, that narrows things down to the pair of hatchback options. Choosing either one of those options from the drop down menu will bring you to the two available hitches, the Draw-Tite...
    view full answer...
    Image 1 for
  • Trailer Hitch and Wiring for a 2015 Mazda 3s Hatchback with LED Lights
    We have yet to have someone come in with a 2015 Mazda 3s hatchback to have a trailer hitch installed so that is why you don't see a video for it. But I have linked the installation instructions for you which contains step by step instructions with pictures detailing the installation process. If you plan on doing some towing with the hitch the correct ball mount to use is # C45521. For a 1-7/8 inch ball use # 19256 and for a 2 inch ball use # 19258. And for trailer wiring you will need...
    view full answer...
  • Towing Equipment Needed for a 2015 Mazda 3 Hatchback
    I would be happy to help you. To add a hitch, capable of towing a 700 lbs tear camper, to your 2015 Mazda 3 Hatchback you will want the EcoHitch Hidden Trailer Hitch item # 306-X7305. This hitch is custom fit for the hatchback model and bolts in behind the rear bumper for a clean install. This will be a great hitch for towing as it has a 2" receiver which will give you the highest capacity available. You will also need the Hopkins item # HM11141824 to control your trailer's lighting functions....
    view full answer...
  • Recommended Trailer Hitch For 2015 Mazda 3 Hatchback with LED Lights
    The Curt Trailer Hitch, part # C11377 is designed to fit your 2015 Mazda 3 Hatchback. This is a Class l hitch and it has a 1-1/4 inch receiver opening. A note form Curt states that all non-trailer loads - bike racks, cargo carriers and so forth - should be supported with stabilizing straps like part # 180050. Failure to properly support these loads will void your hitch warranty from Curt. If you plan on doing some light towing with your vehicle I recommend a ball mount like part # C45521....
    view full answer...
  • Towing Capacity and Trailer Hitch for 2019 Toyota Corolla
    I looked up the owner's manual to your 2019 Toyota Corolla and it states that the vehicle is not designed to tow and that Toyota doesn't recommend towing with it. With such a new vehicle I recommend checking your own manual or with Toyota to see if they can provide a tow rating. If you find you can tow with the Corolla we do have hitches available. I recommend the Curt, part # C11265, because it is tucked under the bumper by about an extra 1/2 inch compared to the Draw-Tite. Since your...
    view full answer...
  • Recommended Cargo Carrier for 2015 Mazda3 Hatchback
    You can use a cargo carrier with your 2015 Mazda3 hatchback but it will need to be a fixed carrier and not a folding carrier. The reason for that is the only trailer hitch that fits your '15 Mazda3 is a Class I hitch that requires the stability that a fixed carrier offers as opposed to a folding carrier. For a hitch I recommend the Draw-Tite # 24914 which fits your hatchback and is a Class I hitch with a 1-1/4" receiver and 200 lb tongue weight capacity. What this means is the combined...
    view full answer...

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Info for this part was:

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