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  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 # HM11143735
Our Price: $69.75
You Save: 32%
Custom Fit Vehicle Wiring

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Shipping Weight: 1.22 lbs
Hopkins Custom Fit Vehicle Wiring - HM11143735
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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. 1-800-496-5010 to order Hopkins custom fit vehicle wiring part number HM11143735 or order online at Free expert support on all Hopkins products. Great prices 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 (18)
  • Q & A (0)
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  • Why etrailer?

Hopkins Custom Fit Vehicle Wiring - HM11143735

  • 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
    • 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 in your rear cargo area on the driver's side and passenger's side. You will have to remove the rear threshold, cargo trays, storage covers, 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.

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.

11143735 Plug-in Simple Hopkins T-Connector with 4-Pole Trailer Connector

Installation Details HM11143735 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - HM11143735

Average Customer Rating:  4.8 out of 5 stars   (18 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.


I installed a Draw-tote class III and Hopkins wiring. It all went great thanks for the awesome videos you guys post.

The hitch and wiring kit are working great. Regarding the wiring, I did what Doug in STL recommended for my 2016 Volvo XC.
Bradford - 03/12/2022

2012 Chevrolet Volt

E-Trailer has done their homework! This package was perfect and included all needed parts. One change I would make if possible, if the Volvo wagon you have has a 12 volt supply in the cargo area you can trace the wire color from the back of the 12 volt receptacle lower down in the floor area and splice in the 12 volt supply in from that location rather than running a power supply from the battery. Either way the system E Trailer has is fantastic and well thought out. Totally recommend over the cheaper versions on the internet.

2015 Volvo XC70

Great product! The harnesses are plug and play. Watch the video for the details, it is extremely helpful. I, however, didn’t really want to get under the car and run the power to the battery. In my 2016, I have a power port in the cargo area and was able to verify with a meter that it has +12V constant. With a little wiring modification I was able to tap into this as the power source and it works beautifully. This might be beyond the skills of others, but you can suggest it to a professional installer as an option.

I also am not crazy about allowing the flat blade receptacle to dangle out the tailgate when in use. I like a more finished look. There is a rubber grommet in the spare tire well specifically for the factory hitch wiring. It is easy to remove. I then sliced it with a utility knife and fit the receptacle through it and out to the hitch, where it is attached with zip ties. I sealed up the grommet to prevent exhaust gas infiltration. Pictures are attached.


What impressed me most with the purchase was the high level of customer service. These guys really know what they are talking about!


makes my car BUZZ every 15 seconds....

This sounds like you have a short somewhere. Maybe some insulation was damaged around a wire and you are catching some feedback. Clean your connections and search for some damaged wires potentially.
-- Etrailer Expert David B - 10/06/2022


Works well. Very satisfied. Very

2013 Ford Edge

Installed on a 2013 Volvo XC70.

easy install. Used the video install guide found on the products webpage.

The only problem/issue for me, was the placement of the wire that goes from the rear all the way up to the engine battery. I did not have the vehicle on jacks stands, maybe that would have helped, but I could not fish the wire under the heat shield as shown in the install video. I made my own way avoiding heat sources and moving parts. Um basically I went left after coming out of the spare tire wheel well grommet. You pass under an exhaust but if you zip tie properly and keep it tight it has space away from the exhaust. From there I kept the wire on the driver side all the way up to the engine bay. Working over the rear tire suspension in strategic spots/holes using the provided zip ties to keep the wire tight. Under the rear and front doors I kept the wire near the edge, where the trim meets the frame. Drilled small holes in the plastic trim that meets the frame and used the holes to run zip ties through to secure the wire and keep it from sagging. Once at the front driver tire i came up through the engine bay as shown in the install video. Drilled a small hole in battery box to run the wire through. I did not cut out a notch as shown in the install video, that cut looked hella bad on the install video, just drill a small hole and run it through. After that it was quite easy.

Took me 3 hours, but I did do little sidetracks like vacuum out the spare tire wheel well of dirt and sand.


Great Job by this company and it’s employees. I ordered a trailer wiring kit. About an hour after I had ordered it, I received a message saying it had shipped! The meticulous installation instructions and updates to my shipment were second to none. I received my item in Alaska in two days!! Good Job!

2017 Volvo XC90

Haven’t installed hitch or wiring yet, but the videos and contact info I received from etrailer are what made me decide to buy their products.


Have use each trailer for many years and many products. Always satisfied. Thanks!


Custom fit and detailed videos made installation easy


Works great would recommend to all


Good product easy to install

2014 Volvo XC70

I works great!

2013 Volvo XC70





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

  • Will Hopkins Trailer Wiring for 2009 Volvo XC70 Cause Battery to Drain
    The Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # HM11143735 that you referenced draws power from the vehicle battery to power the trailer lights but if there isn't a trailer connected with a turn signal function active the harness would not draw any power. So your battery would not drain itself with this kit installed.
    view full answer...
  • Will Hopkins Wiring Harness Work With 2011 Volvo XC70?
    The Hopkins Wiring Harness # HM11143735 is currently the only harness that is listed as a fit for a 2011 Volvo XC70 and there should not be any issues with your vehicle. It has a max amperage of 3 amps per circuit on the stop and turn lights and 6 amps per circuit on the tail lights, but so long as there is not an overload on a circuit and there is a suitable, clean grounding point then this should be a relatively easy install that provides the necessary 4-flat connection.
    view full answer...
  • Installing a T-One Wiring Harness Off a Power Source Instead of the Battery
    For the Hopkins Plug-In Simple Vehicle Wiring Harness # HM11143735 the manufacturer does specify to run the wiring to the battery and use their provided fuse on your 2010 Volvo XC70. My only concern with the running to an alternative source is if the correct amount of power is being supplied. The wiring that is ran through the vehicle that the mechanic used might not have constant battery direct power or enough amperage for the Hopkins harness. The wiring systems on vehicles as become...
    view full answer...
  • Recommended Trailer Hitch Receiver And 4-Way Wiring Harness For 2015 Volvo XC70
    For your 2015 Volvo XC70, I recommend the Draw-Tite Max-Frame Trailer Hitch Receiver - Custom Fit - Class III - 2" # 75916. This trailer hitch receiver is a Class III and has the 2 inch openiing you are looking for. It is a confirmed fit for your vehicle and I've attached a video of this installation for you. It is a square tube design with a black powder coat finish over an e-coat base for superior rust resistance. For your wiring, I recommend the Hopkins Plug-In Simple Vehicle Wiring...
    view full answer...
  • Comparing Curt And Hopkins Wiring Harnesses For 2011 Volvo XC70
    Trailer wiring harnesses for your 2011 Volvo XC70 use powered converters to draw the power for the trailer's wiring. This prevents the taillights of your Volvo from having to power the trailer wiring. The Hopkins kit part # HM11143735 that fits your vehicle runs a line to the positive post of the vehicle whereas the Curt part # C56386 instead runs to the interior light. This is HIGHLY unusual but it is what Curt recommends. So you either would need to run a wire to the battery or to the...
    view full answer...
  • Comparing Curt And Hopkins Wiring Harnesses For 2011 Volvo XC70
    The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56386 and the Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # HM11143735 are similar units from different manufacturers that are both confirmed fits for your 2011 Volvo XC70. The cost differences are based on manufacturer prices and sales as shown on our website at any given time. Both of these harnesses are good products and install behind each tail light into factory...
    view full answer...
  • No Brake Lights with Hopkins Plug-In Harness On a 2013 Volvo XC70
    There are two different sets of tail lights on a 2013 Volvo XC70, a pair in the quarter panel at chest height and a pair in the lower bumper at knee height. I took a look at all the trailer wiring harnesses for a 2013 Volvo XC70 (Curt T-Connector part # C56386, Tekonsha T-One part # 118774, and Hopkins Plug-In part # HM11143735) and these all show the connectors plugging into the tail lights at chest height (see photo). It sounds like you may somehow have them plugged into the tail lights...
    view full answer...
    Image 1 for
  • Trailer Hitch Comparison and Ground Clearance for a 2016 Volvo XC70
    Draw-Tite hitch # 75916 and Hidden Hitch 87674 are identical in every way other than the stickers on them. But Hidden Hitch is actually going away as a brand. Curt hitch # 13266 has a similar design and all 3 hitches will be basically right below the rear fascia. The ground clearance for all of them will be essentially the same with only minute differences if any. When we installed the Draw-Tite hitch on a 2016 Volvo XC70 it measured 14-1/4 inches from the ground to the top o the receiver...
    view full answer...
  • Recommended Class III Hitch and 4-Way Wiring Harness for 2015 Volvo XC70
    For your 2015 Volvo XC70 I would recommend the Curt # 13266 over the Draw-Tite # 75916. These trailer hitches have an almost identical design. Although the Draw-Tite has a higher towing capacity, it looks like both of the hitches exceed the towing capacity of your vehicle so you will be limited by your vehicle. I would double check the owner's manual to make sure. Both have a concealed cross tube, so you will only see the receiver tube at the back of the vehicle giving it a factory look....
    view full answer...
  • Parts Needed To Add A 7-Way Connector To 2009 Volvo XC70
    I can definetly recommend the parts you will need to add a 7-way connector to your 2009 Volvo XC70. You are correct that you will first need to add a 4-way connector to your vehicle. I recommend the Hopkins Plug-In Simple Vehicle Wiring Harness # HM11143735 which will be a plug and play installation that will use its own power wire connected directly to the battery to protect your vehicles factory tail light wiring harness. The Tekonsha T-One Wiring Harness # 118467 you were looking at...
    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 Edited:
Joshua S
Employee Alexander C
Written by:
Alexander C
Employee Brent H
Test Fit:
Brent H

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