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Hopkins Plug-In Simple Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector

Hopkins Plug-In Simple Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector

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Hopkins Plug-In Simple Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector 4 Flat HM43134
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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 OEM tow package wiring harness - no cutting or splicing required. 1-833-496-1390 to order Hopkins custom fit vehicle wiring part number HM43134 or order online at Free expert support on all Hopkins products. Guaranteed Lowest Price and Fastest Shipping for Hopkins Plug-In Simple Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (21)
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  • Videos (4)
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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 OEM tow package wiring harness - no cutting or splicing required.


  • Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights
    • Designed for use with a factory tow package
    • Compatible with 5-pole, 6-pole and 7-pole adapters (sold separately)
  • Connects quickly and easily - no cutting or splicing
    • Locate connection point in rear cargo area
    • Plug in connector
  • Includes a tail light converter to ensure that your vehicle's wiring matches that of your trailer
    • Powered module connects directly to avoid overloading vehicle's electrical system
  • Protective connection terminals resist corrosion
  • Comes with dust cap for 4-way flat connector and terminal grease packet for electrical connections
  • 90-Day limited warranty


This custom-fit T-connector plugs into your vehicle's factory tow package wiring harness, which is located in your rear cargo area on the driver's side. You will have to remove the floor coverings, storage trays, and some interior paneling to access this harness.

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 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.

43134 Plug-in Simple Hopkins T-Connector with 4-Pole Trailer Connector

Item # HM43134

Installation Details HM43134 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Video of Hopkins Plug-In Simple Wiring Harness for Factory Tow Package - 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 Hopkins Plug-In Simple Wiring Harness Installation - 2020 Honda Pilot

Hey everybody, Ryan here at etrailer. Today, on our 2020 Honda Pilot, we're gonna be showing you how to install the Hopkins Plug-In Simple Wiring Harness. But before we do that, why don't we check it out and make sure that this is gonna work for you. So when it comes to these Honda Pilots, you know, they're really capable SUV's. People use them to do a lot of different things. I actually had an older model Pilot and I did a lot with it, used accessories, and towed with it and things like that.

And, if you're someone who's going to plan on pulling a trailer, you're going to need some wiring, a way to illuminate the lights on that trailer. That way people around you know what's going on and you'll be safe and legal. And to accomplish that, you can use the kit, like we have here today. Uhm, ours, we actually have stored on the inside. So this is one way you can mount it.

You can also run it to the outside if you want, but in our case, whenever we're ready to use it, we're going to open up this, pop this off and grab our wiring out. And it's kind of nice that it's stored inside, out of the elements, uhm, out of the way, you know, you're not gonna have to look at it when you're not using it. And all you're gonna do, is drape it over like this and close the hatch. Anywhere is fine, other than the actual latch area. And it might seem kind of odd closing this on the wiring, but nothing wrong with it.

Uhm, it's designed to do that more or less. So you're not going to damage anything or whatever the case may be. But you know, having this back here, is gonna allow you to take your trailer line, plug into it and get everything powered up. So this kit is going to have the four-way flat type connector, a really common size for a lot of these smaller, maybe medium size trailers. You'll get your running lights, your turn signals and your brake lights.

Uhm, and if you're someone, that is going to want to route this outside and maybe monitor it up down here, you can do that. Uhm, I would suggest getting a no-drill bracket and a four-way flat connector bracket, which we saw here, on etrailer, that we can actually mount it up. And I'll show you a grommet that you can use to run it outside during the "Install" video. So if you're interested in that, check that out. With that said, though, uhm, you know, the kits in it, you know, one of the big turnoffs for me is that they don't give you a fuse that you need to put in under the hood to kind of activate your harness tow package. So you will have to source that separately. A couple of the other kits available, both the Curt and the Inertial give you that, so, you know, that's, that's just kind of one of the things, and with that said, if you're looking to maybe tow some bigger or larger trailers that have the round, the seven-way type connector, there's wiring that we offer, kind of the same yield, as this for plugs and everything, but it gives you that round seven-way connector itself. If that's the type of trailer that you have, that's definitely the type of wiring kit that you're gonna need. Other than that, though, a pretty straight forward kit, you know that it's gonna work and power up your trailer lights. As far as the installation goes, really not too bad. There's a couple of panels you got to pop off back here, more or less, this just plugs in and you have to ground out one wire, so pretty straight forward. I feel like just about anyone should be able to do it. So uhm, if that's something you're trying to figure out how to do, stick around. If not, I hope to see you around. To begin our installation, we're gonna be here at the back of our Honda, and we're going to be working inside. So we'll open up our hatch. Now we're gonna have a couple of panels that we need to take out. First one, being your forward covering here, just lift this up and out of the way. And then we're going to be primarily on the driver's side here. So we're going to have two panels: this one, and this one. To get these out, you can take a flat-head screwdriver, just kind of work in behind it, pop that out, and then this one here, and just grab that, and send him off to the side. So I went ahead and pulled our connector plug down, and I did this, because it'd be pretty much impossible to see on camera, but this is usually just right up here, about a finger's worth up, and you can reach up there and feel it. And there's usually a piece of tape around it. You can try to remove that tape out of the way, or just kind of carefully pull hard on this to expose that connector plug. We can grab our wiring end, as well as the ground wire here, that's this white one with the ring terminal on it. We're going to feed this under this opening and up there, here, like so, and this connector end just simply just got to line right up, and click into place. Now we need to hook up our ground, and so what we got to do, we're going to have a flat side screwdriver right here, and go ahead and remove it. And here's a screw. So what you need to do is take that screw, put it through the ring terminal there on our white wire, and we're simply just gonna get it reinstalled. So, I went ahead and secured our module box. I pulled our spare jack out of this opening just so we could see better, work a little bit easier, but, I secured it using a zip tie. There's some factory wiring and tubing that kind of runs down through there, and I just zip tied it to that. So now, if we move under our hood, and you pop the hood if you're on the driver's side, we're gonna have this fuse box, remove this cover, push those tabs in, and this slot right here, we need to put a fuse in it. So this kit's not going to come with the fuse. This is a 30 amp "Jcase" fuse, it's what they call it. So you'll have to get this separately. Unfortunately, I looked in all the other fuse boxes on the car, to see if there happened to be a spare that we could just steal, but there was not one. So this is kind of what we have to deal with. But we'll put that in place and we can close that up. And what we're going to do is test our wiring before we kind of route it and get it all cleaned up and everything. By that way we can verify it works. To test our wiring, I'm using a small tester, which I recommend doing, as opposed to just hooking up to your trailer. Uhm, that way, if your trailer has any issues, you're able to bypass them using a tester like this. With that said, we'll try our left turn signal, our right turn signal, our brakes and our running lights. So I started putting some of our stuff back together, the opposite way that we removed it. And you have a couple of choices here. You can either leave your wiring inside of the storage compartment inside of your vehicle and pull it out whenever you're towing or whatever it is you're doing, and whenever you need it, or if you'd rather it be routed outside next to your hitch, you can do that too. Right in here, there's a rubber grommet. You can pull that out, cut a slit in it and then just feed your wire through it and run it outside, that way. So that's, an option for you as well. In our case, we're just gonna leave this stored inside though. So I'll just kind of bundle it up, put it in there and put our panels back together. And that'll finish up our look at, and our installation of the Hopkins Plug-In Simple Wiring Harness on our 2020 Honda Pilot..

Customer Reviews

Hopkins Plug-In Simple Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector - HM43134

Average Customer Rating:  4.6 out of 5 stars   (21 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into OEM tow package wiring harness - no cutting or splicing required.

2019 Honda Pilot

Amazing trailer hitch very well made fit exactly no problems what do ever and the shipping is also amazing this company said it would be 3 days and it was 3 days. I love it when a company makes a great product and you get it when they say you will get. I will definitely buy from them again thanks for being amazing all around


The wiring harness was very easy to connect and works great.

Still works like a champ after I got the 30 amp fuse which isnt included
Dave W - 07/20/2021

2016 Honda Pilot

Harness installed pretty easily, but it does not include a grommet so I had to cut and glue the grommet that comes with the car. Rather than drill a hole in the sheet metal for the ground wire, I just used one of the existing Phillips-head screws in the general area of the white connector ( I checked to see if it was grounded first with a voltmeter touching the 12V accessory socket in the back of the car). The biggest headache occurred when testing the four wires to see if they worked. With the engine running, I got no voltage readout, because you need a 30 amp fuse, which isn't included in the kit, and which is not needed according to the FAQ's on this site. I was only able to get a voltage readout when I put in the fuse.


Simple instillation and works great. Cannot recommend using the instruction videos on website.


Worked as described. Arrived as promised

2017 Honda Pilot

Very easy install in my Honda Pilot after watching your video! Really strange that they don’t include the 30A fuse that is REQUIRED to have the item work. After a stop at an auto parts store I was good to go.

This kit does not include the necessary fuses to activate the Pilots tow package. Both the Tekonsha # 118760
T-One Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector
and Curt # C56291
Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector
wiring harnesses include the fuses needed to activate the tow package.
-- Etrailer Expert Victoria B - 08/22/2019

2021 Honda Pilot

No 30 amp fuse included. This needs to be told to customers in advance.

Thank you for your review. This wiring harness made by Hopkins does not include the fuses needed to activate the tow package. For that reason, I recommend the Curt T-Connector Vehicle Wiring Harness for Factory Tow Package part # C56291
Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector
that does include the fuses.
-- Etrailer Expert Heather A - 07/07/2021


Very easy to install, literally plug and play. The OEM location was very inconvenient but the product itself was very easy to install and has been running flawlessly for over a year. Very happy.


I watched the video and had this installed in five minutes. Very easy to install and as always, eTrailer had the right item, quick shipping, and easy to follow installation videos.

2017 Honda Pilot

It was missing the fuse for the car

Hopkins doesnt include the fuse, because in many but not all cases the fuse is already in place in the vehicle.
-- Etrailer Expert Mike L - 06/17/2019

2017 Honda Pilot

Super nice product. Easy to install only problem the bolt they said to put ground wire on the eye was to dmall for bolt. I just cut it off and replaced with bigger wire eye let. No worries. Maybe 10 mins to install

2018 Honda Pilot

Perfect fit for the Honda Pilot 2018 EX AWD, very good quality.


Be nice if the fuse was included otherwise worked well, pretty easy

2019 Honda Pilot

Followed install video and got it installed in 15 minutes. Instruction in package were worthless.






Order it and bam it is here. Fast servi ce!




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

  • Does Installing Hopkins Trailer Wiring HM43134 Require Installing Fuse
    To install the Hopkins trailer wiring kit part # HM43134 that you referenced will need to install a 30 amp fuse in position two of your vehicle for the harness to be functional. Some vehicles have this present already buy some do not.
    view full answer...
  • Recommended Trailer Wiring Harness for 2017 Honda Pilot
    For your 2017 Honda Pilot, I recommend the Tekonsha 7-Way Trailer Connector # 118286 if your trailer has a 7-Way connector. If your Pilot has the factory tow package, then it should already have a 7-Way connector mounted beneath the rear bumper, which this would do a great job of replacing. Otherwise, even if your Pilot does not have the factory tow package, this is still a confirmed fit and will simply plug into the existing ports behind the driver side trim panel. I confirmed this with...
    view full answer...
  • Comparing Trailer Wiring Harnesses for 2019 Honda Pilot
    The difference between the Hopkins Plug-In Simple Wiring Harness # HM43134 and the Tekonsha T-One Vehicle Wiring Harness # 118760 is that the Tekonsha comes with the fuses to activate the tow package in your 2019 Honda Pilot while the Hopkins does not. If you take a look at the accompanying photo of the two parts you can see the included fuses; this is why I recommend going with the Tekonsha # 118760 to add a 4-way to your 2019 Honda Pilot. I have attached a link to the installation instructions...
    view full answer...
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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Joshua S
Video by:
Joshua S
Employee Kathleen M
Video by:
Kathleen M
Employee Zach D
Video by:
Zach D
Employee Jacob T
Video Edited:
Jacob T
Employee Chris R
Video Edited:
Chris R
Employee Alexander C
Written by:
Alexander C
Employee Shane H
Test Fit:
Shane H
Employee Ryan G
Test Fit:
Ryan G

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