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

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

Item # HM11143885

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Custom Fit Vehicle Wiring

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Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Connector Powered Converter HM11143885
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  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • Hopkins
  • Powered Converter
Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring - no cutting or splicing required. Call 800-298-8924 to order Hopkins custom fit vehicle wiring part number HM11143885 or order online at etrailer.com. Free expert support on all Hopkins products. Guaranteed Lowest Price and Fastest Shipping for Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Connector. Custom Fit Vehicle Wiring reviews from real customers.

  • All Info
  • Reviews (15)
  • Q & A (4)
  • Videos (5)
  • Photos
  • Why etrailer?

Hopkins Custom Fit Vehicle Wiring - HM11143885

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring - 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
    • Compatible with 5-pole, 6-pole and 7-pole adapters (sold separately)
  • Connects quickly and easily
    • Locate connection point in rear cargo area
    • Plug in connector - no cutting or splicing
  • 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. You will have to remove the cargo area cover and interior trays to access this harness. Once you've plugged in the connector, insert the provided fuse into the in-line fuse holder.

Once installation is complete, the 4-way 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.

11143885 Plug-in Simple Hopkins T-Connector with 4-Pole Trailer Connector

HM11143885 Installation InstructionsInstallation Details HM11143885 Installation instructions

This Product Fits The Following Vehicles

2015 - 2019 Subaru Outback Wagon

California residents: click here

Video of Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Connector

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Hopkins Custom Fit Vehicle Wiring - Trailer Hitch Wiring - HM11143885 Review

Today we're going to be taking a look at part number HM11143885. This is the Hopkins plug-in, simple vehicle wiring harness with a 4 pole connector. It's going to fit certain years and models of the Subaru Outback. It's going to provide that 4 way flat trailer connector at the back of the vehicle to power the trailer's signal lights. The plug's going to be compatible with 5 pole, 6 pole, and 7 pole adapters. The adapters are sold separately. It's going to come with a dust cap.

That way you can protect the connections points when the connecter's not being used. That wiring is going to run to a taillight converter. This is going to insure that your vehicle's wiring matches that of your trailer's. This is going to connect directly to the battery through the wiring system, to avoid overloading the vehicles electric system. Coming off this side of that taillight converter, it's going to take us directly to our fuse holder.

That's got a hole in it right there in the tab, so it can be mounted if we so choose. Open it up, and you can see that it's already going to come with the 10 amp fuse installed. That snaps shut for a nice tight, secure connection. Then the wiring is going to run all the way to the plug. This is going to be the plug that connects to the OEM wiring system. Once you have all of this out and ready to be installed, you're going to need to locate the connection point in your rear cargo area.

It's going to be located on the driver's side. Simply just take this connector, and plug it in. The plug's are going to match up perfectly. They're going to snap lock together for a nice tight, secure fit. Once you have that plugged in you're going to need to secure you're converter box.

You can do that using a couple of the zip ties that are included with the kit. It's got 2 little brackets here on the side. Run the zip ties through, get it secured in a nice, out of the way location. Securing that with the zip ties is really going to help prevent damage to the system. It's going to prevent rattling. That way you don't have to worry about any type of rattling as you're going down the road. Then you can secure all the other wiring with all the other included zip ties for a nice, tight, secure fit. As well as, overall, a pretty neat and clean installation appearance. Once you're installation is complete, the 4 way flat connector is going to be stowed in the rear cargo area. This kit includes the harness; you're going to get the 10 amp fuse, you're going to get all the zip ties that's necessary, and you're going to get a terminal grease packet. You can apply this to the plugs on the vehicle, and the 4 pole connector itself. That's going to help prevent erosion. When it comes to the maximum amperage for the stop and turn lights we're looking at 3 amps per circuit, and for the taillights we're looking at 6 amps per circuit. That's going to do it for today's look at part number HM11143885.

Customer Reviews

Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Connector - HM11143885

Average Customer Rating:  4.9 out of 5 stars   (15 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 - no cutting or splicing required.

- HM11143885
2016 Subaru Outback Wagon

Arrived in a timely manner. After watching the helpful installation video was easy to complete in around 15 min. 573497

- HM11143885

Installation Video was spot on. Ten minutes start to finish. Plug will be used with 306-X7266 EcoHitch Hidden Trailer Hitch Receiver - Custom Fit - Class III - 2" 524212

- HM11143885
2018 Subaru Outback Wagon

This seems like a high quality product. It was an absolute beast to get the factory coupler out from under the panel as seen in the video or a 2018 Subaru Outback - it is apparently taped up there and if you don't have child sized hands you can expect a lot of pain finding the coupler and pulling it out. I slightly ripped the panel doing so, but it covered up nicely when reinstalling the floor trays. 515142

- HM11143885

Received both the hitch and electrical connections in than two days and in excellent condition. So far car say nothing but good things about etrailer and give a high recommendation. Hopefully the hitch will go on as easily as suggested. 604248

- HM11143885
2015 Subaru Outback Wagon

The Hopkins wiring harness is great, came on time and packaging was good. This went on my 2015 outback easily and works good. The only thing I did different from the instruction was after plugging into the cars wiring I ran the rest of the wire into the spare tire area and cut a slot in the rubber plug in the bottom and continued the connector along under the car to the trailer hitch then mounted the plug to the hitch with a bracket I made out of small angle iron bolted to the hitch. Then sealed the rubber plug around the wire with rubber cement and made sure all the slack in the wire underneath was gone so as not to catch on anything while driving. I did it this way because I didn't want to run the wire out the rear hatch door when connecting it to the trailer And it looks and works good. 484807

- HM11143885

Mine did not come with the car connector protective cap or the grease. I think if you mentioned to take out the cargo hold down (1 -10mm bolt) you can actually see the connector and it gives you more room to get your hand in there.No blind guessing as to what you are trying to pull down. 423225

- HM11143885

The wiring harness worked as advertised. Just reach under the rear of the left side wheel well plastic cover to find the Subaru wires taped to the metal. Plug into harness and you're good to go. Easy! 608180

- HM11143885

The products were great and installed with no problem. What I really appreciated was the videos provided to help with the installation. Your service was great, items shipped the next day and arrived with no problems. Huge thankyou 688704

- HM11143885
2016 Subaru Outback Wagon

This installation could not be any easier, took me less than half an hour, the video was right on and it went together perfectly. I like the fact that the plug remains in trunk when not in use and is not exposed to the weather. I would strongly recommend this product. 663402

- HM11143885

Rather than trying to snake your hand up blindly to locate the plug (seen beginning at 2:37 of the 2017 installation video), I STRONGLY recommend removing the the cargo tie-down. Fold the rear seat down on the driver's side, and gently flip up the carpeted cover (held down with 3 push-pins). With a flat-bladed screwdriver, gently pry the plastic inner piece of the tie-down downward to expose the 10mm bolt. After removing it, and the entire tie-down assembly, you will be able to easily see the plug through the opening. This makes it much simpler to reach in from underneath to pull down the plug. The rest of the installation can proceed as normal. 647409

- HM11143885

Very well made. Install went very well 643018

- HM11143885
Subaru Forester

It took awhile to find out where to plug it in to, the Forester has a different place than the Outback. I did some online research and found a youtube instruction that got me there for where it is in the Outback. 614386

- HM11143885

Easy to install, MUST watch videos before installing. 612106

- HM11143885

The wiring worked great. I have rather large hands, so had my wife reach up in there as instructed for my vehicle. She pulled out the connector and I finished wiring it up. Everything worked great. 593276

- HM11143885
2010 Subaru Outback Wagon

Installed this in my Subaru Outback. Was very straight forward, and the video on etrailer.com also made it very easy. I rate myself maybe a 7 out of 10 in handiness, so if you're the same way, you can definitely take it on. 389959


Ask the Experts about this Hopkins Custom Fit Vehicle Wiring

Do you have a question about this Custom Fit Vehicle Wiring?

  • Comparing Draw-Tite, Curt, and EcoHitch Trailer Hitches for 2017 Subaru Outback
  • That is an excellent question, and I believe you were referring to the three trailer hitches for your 2017 Subaru Outback that have concealed cross tubes, the Curt # C13410, Draw-Tite # 76227 and EcoHitch # 306-X7266. The EcoHitch is constructed from an alloy of recycled metals, which is something people do value and is the reason some people opt to go for it. That said, the Curt and Draw-Tite are going to be more cost-effective and they also have higher capacities than the 3,500 lb...
    view full answer...

  • Recommended Trailer Wiring Harness for 2015 Subaru Outback 2.5i
  • The T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118467 is the one I recommend over the other two for your 2015 Subaru Outback 2.5i. This brand of harness has less issues than the others. The Hopkins # HM11143885 and the Curt harness # C56040 are very similar as you stated and all three will work well. It is the same product made by 3 different manufacturers. I personally would get the Tekonsha based on the reputation of reliability and customer feedback.
    view full answer...

  • Parts Needed to Tow a Trailer with 2018 Subaru Outback
  • According to an online owner's manual for your 2018 Subaru Outback the 2.5L can tow a trailer up to 2,700 pounds as long as the trailer has brakes. If it doesn't have brakes then the Subaru maxes out at 1,000 pounds. Additionally, there's kind of a weird statement that says "When towing a trailer on a long uphill grade continuously for over 5 miles (8 km) with an outside temperature of 104 degrees F (40 degrees C) or above", the towing capacity is 1,350 pounds. If your trailer is within...
    view full answer...

  • Trailer Wiring Recommendation for 2015 Subaru Outback Wagon
  • Sounds like a short damaged the converter box of the harness you have. This happens typically when there was a pretty bad short on the trailer wiring. The boxes are designed to short themselves out when they sense a bad enough short to prevent the short from transferring to the vehicle's wiring. So what you'll want to do is find out where the short is on your trailer and fix that so that when you replace the wiring you don't also damage the new kit. The Tekonsha kit part # 118467...
    view full answer...

Do you have a question about this Custom Fit Vehicle Wiring?

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Info for this part was:

Edited by:
Lindsey S
Expert Research:
Jameson C
Video Edited:
Joshua S
Video Edited:
Jacob T
Video by:
Kathleen M
Video by:
Dustin K
Installed by:
Cole B
Photos by:
Sam P
Test Fit:
Randy B
Video Edited:
Chris R
Test Fit:
Jared G
Written by:
Alexander C
Video by:
Zach D
Test Fit:
Robert C
Test Fit:
David F

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