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  1. Custom Fit Vehicle Wiring
  2. Hopkins
  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 4 Flat
  6. No Converter
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

Item # 41155
Our Price: $23.41
You Save: 29%
Custom Fit Vehicle Wiring

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Shipping Weight: 0.42 lbs
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41155 - 4 Flat Hopkins Trailer Hitch Wiring
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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. 1-800-496-5010 to order Hopkins custom fit vehicle wiring part number 41155 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 (54)
  • Q & A (0)
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  • Why etrailer?

Hopkins Custom Fit Vehicle Wiring - 41155

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • No 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 behind rear bumper
    • Plug in connector
  • Protective connection terminals resist corrosion
  • Comes with dust cap for 4-way flat connector, cable ties, 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 behind your rear bumper.

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.

41155 Plug-in Simple Hopkins T-Connector with 4-Pole Trailer Connector

Installation Details 41155 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Hopkins Plug-In Simple Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector - 41155

Average Customer Rating:  4.6 out of 5 stars   (54 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.

2022 Nissan Titan

The reason for three stars is that you'll need a relay tow package kit in order for it to work . It should come with the 4 flat plug for the trailer lights to work . Other that that simple plug & play done

Jeep Grand Cherokee

Quick delivery and easy install. Didn't work and found out that if the towing package didn't come on the Grand Cherokee, you have to go to the dealership and have it programmed or "turned on" in order for it to work. No fault of etailer.

2007 Chevrolet TrailBlazer

This was my first time pulling my 20 foot CC boat and brand new trailer with my 07 Trailblazer which came with the factory installed tow package including the factory installed 7 pin connector for the lights. I ordered the wiring connector item as it had a guaranteed fit for my truck. I went to install it and initially thought it did not fit correctly as I was trying to attach it by flipping up the pin connector cover underneath the rear of my truck and putting it in there, this was wrong but I did not know it....briefly went and reviewed my truck manual but it did not go into any detail on how to connect the trailer wiring, went online and finally found out that I needed to reach behind the cover piece and squeeze in 2 tabs to release the tow truck wiring connector, this is what the Hopkins harness is designed to fit into and it worked perfectly. As I just did this I have no idea what the longevity of the wiring harness will be but it does come with a nifty little cover to protect the electrical pins. As I do not plan on using it that often I removed the harness to keep it safe and sound.

I store the device inside my truck and do not leave it attached to save it from the elements, so far one year later works perfect.
Patrick - 07/23/2019


Parts was on time & easy to install works great.I will definitely used etrailer again in the future.Thanks guys

2014 Audi Q7

Told me all I had to do is plug it. Now I have to wire tge blue and red cable. My vehicle comes with the the 7 plug tow package. Was told to turn it into 4 plug all I had to do is plug it.

Thank you for leaving a review! The product page does say all you have to do is plug it in if you want a 4-pole connector. Which is true, you can just tuck those red and blue wires away unless you need the braking and an auxiliary power wire. It sounds like your trailer just has a 4-pole flat for trailer lights so you do not really need those 2 extra wires if that is the case.
-- Etrailer Expert Brooke M - 10/15/2021


Quick delivery and product seems good. Connection to my Audi is not perfect, there is no snap lock on connection. Taped it together with electrical tape.

2005 GMC Sierra

Perfect fit for my 2005 GMC Sierra! The 6 narrow pin male plug fit perfect into my 7 narrow pin receptacle on my truck. It gave me parking lights, brake and my individual turn signal lights all from the four pin trailer plug. Beware of internet re-sellers that say their #41155 will work if they are showing you 6 wide male pins that will not work. etrailer is the best! Super fast shipping, fantastic customer service and all at a great price! Thank you!

I could not be happier! A year later through a sloppy winter and my Hopkins Trailer Light harness has been flawless. Keep up the great work!
Prrbaldwin - 10/02/2020


I have bought three different trailer hitches, wiring and other items.
Everything fit perfectly, the videos are excellent and the staff is knowledgeable,and patient with us do it ourselve customers.
Pricing is fair, so they deserve 5 Star rating.


package arrived with the hitch partially exposed due to a tear in the box . only took aprox 15 min to install looks great ! havent pulled anything yet. looking forward to trying it soon thx !


Worked perfectly!


product functioned as expected...... the round plug that fit the tow vehicle needed some slight modification.... after i year the grounding pin on the flat four plug fell out,.... simple enough fix....... still works great.

just as it should....
Torsten - 03/06/2018

2014 Dodge Durango

The trailer wire harness for my 2014 Dodge Durango worked perfectly. It fitted into the prewired factory wire harness attached behind the bumper. I had to have the dealer program the vehicle for the lights to work. The dealer did not charge me for this service, since I was having some other work done on the vehicle they did it as a courtesy. Normally it cost about $50 to do the programming.

2011 Jeep Liberty

What I needed all in one place. Came 2 days early so that is always welcome. Would highly recommend as this is my second order and not a problem yet

2005 Nissan Titan

Ordered the Hopkins plug-in simple wiring kit with 4 pole connector (41155) for my 05 Nissan Titan. Received what I order very quick. Connected perfectly to my truck with out any issues. I was ready to attach my trailer and go fishing. It was exactly what I ordered.

2007 Chevrolet TrailBlazer

Simply did what it was supposed to do. Unplugged the old wiring harness and replaced it with this new one.







Plug in and works great. Took off the old plug that was all green with crud. Fit my truck just as ordered. All trailer lights work as suppose to.

2017 GMC Sierra

I purchased a plug-in wiring adapter for my 2017 GMC Sierra. Great price, product arrived at my house quickly. Works fine, fits great, no problems. I'd recommend this company and product to anyone out there.

2006 GMC Sierra

This was the easiest wiring harness that I have ever installed, It took less than 5 minutes and works great.


Sold me the wrong connector.
it for a friends trailer, cut the 4way end off, wired it up, not knowing, and my buddy let me know that night.
Fast service though.

2008 Chevrolet TrailBlazer

4 stars is for quick delivery and easy ordering, I have not used the extension yet. But, thanks for everything that went so well so far.

I have used this many times. Very easy plug and play install and works well.
David - 05/17/2019


Great product fast and easy install

2012 Chevrolet Silverado

Etrailer was the only company that had it in stock . It arrived well packed ant it fit perfectly. I am very satisfied with this product.


Harness was perfect length and all connectors were correct. Only difficulty was having big hands to access vehicle tow pkg plug.

2017 Buick Enclave

doesnt fit my 2017 enclave. get part number 118270 not this one.

Jerry, this wiring harness is for vehicles with factory tow packages. It may require additional components or may be used as a replacement harness. The # 118270
T-One Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector
wiring harness can be used as an OEM replacement, but it also includes the fuses and relays to activate the tow package if your vehicle was not equipped with the tow package.
-- Etrailer Expert Laura E - 08/11/2017

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