bing tracking image
  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 # HM11143270
lowest price pledge
Our Price: $66.72
You Save: 35%
Custom Fit Vehicle Wiring

Will this fit?

To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.

Orders above $99 qualify for Free Shipping
Shipping Weight: 0.85 lbs
In Stock
Hopkins 4 Flat Custom Fit Vehicle Wiring - HM11143270
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Need help with installation?
Locate installers near me
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 HM11143270 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 (3)
  • Q & A (0)
  • Videos (2)
  • Photos
  • Why etrailer?

Hopkins Custom Fit Vehicle Wiring - HM11143270

  • 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
  • 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 electrical junction box, which is located behind the driver's-side tail light. You will have to lift the storage lid in your cargo area and remove the panel on the driver's side to access this junction box. Once you've plugged in the T-connector, insert the 10-amp fuse in position 2 and the 7.5-amp fuse in position 11 of the junction box.

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.

11143270 Plug-in Simple Hopkins T-Connector with 4-Pole Trailer Connector

Installation Details HM11143270 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Video of Hopkins Plug-In Simple Vehicle Wiring Harness with 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 Vehicle Wiring Harness Installation - 2020 Acura MDX

Ryan: Hey everybody, Ryan here at eTrailer. Today on our 2020 Acura MDX we're going to be taking a look at, and showing you how to install, the Hopkins Plug-In Simple! Vehicle Wiring Harness.Since MDX's are really versatile SUVs many people use them to do a little bit of everything, so whether say you have a light up cargo carrier, or plan on doing some towing, you're going to want some trailer wiring. That way you can be safe and legal. And this kit is going to do just that. It's going to illuminate and provide your trailer with all those necessary functions, so other motorists know your intentions as you're going down the road.Now something pretty cool about this kit is the fact that it's going to be completely hidden whenever you're not using it, but it's going to be super easy to get to whenever you are ready to use it. And that's because it lives inside of our MDX.

So whenever we're ready we'll just open up our hatch, we'll lift up on our floor coverings, and we can pull our wiring out. It's as simple as that.So the way this is going to work is this is going to get draped over your threshold here. So you'll just rest it like this. Anywhere on the weatherstripping is fine, it's perfectly normal, it's not going to hurt the wiring or anything like that when we close the hatch on it. But I will say you want to do your best to avoid the latch here, you don't want to get it hung up in that.That being said we'll close our hatch.

And now we're ready to hook up to our trailer or our light up accessory. This kit does give us quite a bit of wire to work with, almost too much actually, but I'd rather have it and not need it than the other way around. So you can always put some of this extra wiring back inside and close the hatch.But with that being said this is a 4-pole connector, so really common. And even though it does come with, actually, a really nice cap, I would suggest putting some dielectric grease on the terminals from time to time to help go that extra mile to keep them protected. And it's pretty convenient, the kit actually comes with a small pouch of that.

So that should get you by for a while.Something nice about this kit is the fact that it uses a module box. And what that's going to do is protect your Acura's factory wiring if a short or an electrical issue we're to occur on the trailer side. And to me that's really important. These newer vehicles have really complicated electronic systems and you wouldn't want to do anything to jeopardize that. So because of that module box that's one less thing we're going to have to worry about.Now as far as the installation goes it really can't get much easier.

More or less all you have to do is lift up your floor coverings, plug in your harness to a connector, and install a couple of fuses. That's really all there is to it, so you shouldn't have any issues getting it done by yourself at home in the garage or even in the driveway. Speaking of which let's go ahead and do that together now.To begin our installation we're going to be here at the back of our Acura and we're going to need to locate our factory connector, so that'll be in the hatch. So we'll open that up and we're going to have to remove a few floor coverings or push them out of the way at least. Flip that one up, as well as this one. We can grab this little cargo container there and push that up out of the way as well. And on the driver's side we're going to have a little panel that's covering up our fuses. What we need to do is pop that off and our connector should be under there. So we can just get a small flat head and pry that open.So now we're able to grab our new trailer wiring and get it plugged in. The connector that we're going to be using is this one right here. So we'll just take our new trailer wiring, I'm going to run it behind the plastic there, that way it doesn't interfere with our fuse box cover. So we'll take that and simply just push it into place.Now we can grab our white wire with the pre-attached ring terminal and ground it to the body of our vehicle. Well it turns out, conveniently, there's a factory ground right here. So I'm going to pull off that bolt using a 10 millimeter, so we'll just run that out. And we can take that same bolt, push our ring terminal through it like that, and simply just re-secure it.Now what we can do is come to our fuse box here and install the included fuses. So we're going to be using this slot right here and we're going to put the 10 amp fuse in it. And we're also going to be using this slot right here and we're going to be putting in the 7.5 amp fuse there. So these are kind of small, sometimes it helps to take a pair of needle nose pliers and at least get it going that way. Not a ton of room to work, especially if you have larger hands, so these pliers really make it a lot easier.At this point it's a good idea to test your wiring and make sure that it's functioning properly. I'm using this little tester here and you can find it at We'll first try our left turn signal, our right turn signal, our brake lights, and our running lights.Now that we've verified our wiring works I went ahead and just used a couple of zip ties to secure our box here to this factory wire line, keep it from bouncing around. That's how ti turned out. And once we have that secure you can go ahead take our fuse cover, pop that back into place, and then just flip back down all of our floor coverings.Now our wiring does live inside the vehicle, so we can just bundle it up here and put our floor coverings back on top of it. However, if you prefer to route it outside of the vehicle to your hitch that's 100% acceptable. And to do that if you look right here there's kind of a little circle section here in this rubber mat, if you actually cut that out underneath it there should be a rubber grommet there, and you can use that rubber grommet to push your wiring to the bottom side of our Acura, and mount it outside. If that's how you want to do it. You just take our floor coverings and flip them back down into position.And that'll finish up our look at, and our installation of, the Hopkins Plug-In Simple! Vehicle Wiring Harness on our 2020 Acura MDX.

Customer Reviews

Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - HM11143270

Average Customer Rating:  5.0 out of 5 stars   (3 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.


Very easy to install great instructions loveed the video


2020 Acura MDX


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

  • Does a 4-Flat Vehicle Connector Work w/ Surge Brakes on a 2019 Acura MDX?
    Yes, the Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector item # HM11143270 will work with surge brakes. The wiring harnesses do not have any compatibility issues with surge brakes. However, I recommend going with the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector item # 118628 over the Hopkins connector. Tekonsha makes a more reliable product. This custom-fit T-One connector plugs into your MDX's junction box, which is located in...
    view full answer...

  • Why

    At we guarantee:
  • Highest quality custom fit vehicle wiring for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate custom fit vehicle wiring information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Joshua S
Video by:
Joshua S
Employee Jacob T
Video Edited:
Jacob T
Employee Chris R
Video Edited:
Chris R
Employee Cole B
Installed by:
Cole B
Employee Alexander C
Written by:
Alexander C
Employee Ryan G
Test Fit:
Ryan G

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.