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  1. Custom Fit Vehicle Wiring
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  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 # HM43575
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Custom Fit Vehicle Wiring

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HM43575 - No Converter 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 HM43575 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 (131)
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  • Why etrailer?

Hopkins Custom Fit Vehicle Wiring - HM43575

  • 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 on the driver's side.

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.

43575 Plug-in Simple Hopkins T-Connector with 4-Pole Trailer Connector

Installation Details HM43575 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Reviews

Hopkins Plug-In Simple Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector - HM43575

Average Customer Rating:  4.8 out of 5 stars   (131 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.


Great quality, with handy accessories and for less money than from competitors. I've bought several items from, including entire hitch assemblies, and have been satisfied every time.


This item fit perfectly. Easy to find on the website and arrived on time. The videos provided by etrailer were very helpful.


Great hitch, no rust, no problems, wiring harness was also a breeze with no issues

2008 Nissan Frontier

Products were just as described and shipped very quickly. I had trouble with the installation so called Customer Service. They provided truly excellent information - very clear, helpful, and took their time helping me out. Highly recommend.


Once I remove factory plug from outlet plugging in the accessory wiring kit was extremely easy


Great & NO issues at all!!!


Snaps right into factory connector. It works great.

Nissan Frontier

The DrawTite hitch I purchased fit beautifully. The wiring harness plugged into the Nissan Frontier with minimal effort. Shipping of the order was very prompt.

2017 Nissan Frontier

Matched factory plug perfectly, did cover the wires with split loom to protect them and make it look nicer. My truck didn't have the tow package, so the factory connector was dead, as there are other things that need to be done under the hood to make it live, but thats on me for not reading the guide.

Andrew, thank you for your review. If your 2017 Nissan Frontier does not have a tow package you will need part # 118525
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
that includes the jumper harness and relays. The relays plug into the jumper harness and the harness installs behind the kick panel of the passenger side front door area. I have attached a link to an install on a 2017 Nissan Frontier.
-- Etrailer Expert Heather A - 05/19/2018

2012 Nissan Frontier

These are so great and easy. Have ordered these for other vehicles in past, this was for our 12 Frontier. My son put it in took a minute, then a few more to route wire/plug out to back and secure along the route. After 5 minutes, he jumped in the truck to go bring home another Honda

2012 Nissan Frontier

Great product perfect fit fast ship.tha nk.

2019 Nissan Frontier

Nicely made pigtail. The six prong plug fits right into the receptacle in the wiring on my truck. I bought the little right angle bracket for the 4 pole end of the plug, but unfortunately, the plug was a little bit too large to fit into the hole in the bracket.


Easy breezy

2017 Nissan Frontier

The wire harness hooked up ok. Right T/signal, Left T/signal ,Brake/lite all worked but I do not have running lights. I will be sending a question regarding this.
All in all its a fair deal

replaced with new updated harness and all works great
Bobby R - 08/07/2018

2011 Nissan Frontier

perfect, easy


Simple to install. I'm happy with the product and follow up by customer service.


This harness worked great. I liked their website,easy to use and easy to order. Shipping was fast. Pleased with this purchase. Thank you


The item came faster than expected. Very easy to install. Worked perfectly


6 yrs ago when I purchased my truck it didn’t have the trailer wiring on it. I shopped around and fought this product and purchased it. I had an issue last year and thought it was the harness so I purchased another one but as it turns out it was a blown fuse deep down in my fuse panel under the hood of my truck. So this is the second one I have bought and I don’t need it because the first one I purchased is still going strong but at this price and quality I’m going to hold on to it in case I do need it down the road. Great product

2012 Nissan Frontier

Screw splicing wires unless you just like being frustrated, miserable, and having regretful thoughts. Even if you are poor.....this will probably be cheaper! If a car has a trailer light hookup this is the ONLY way to go. I had this plugged in working in less than a minute. Hardest part on any of this is finding the wiring adapter on the vehicle. Took me 10 seconds to find it on the Frontier and about 30 seconds to get it hooked up....getting the cover plug off to expose the clean receptacle took some wiggling and a screw driver to push the little release tab. OK, I'll say it took 3 minutes because I had to send my son downstairs to get the little flathead screwdriver!

2011 Nissan Frontier

Fit my truck plug with no issues


It was the perfect fit for my application. I am very pleased with my purchase! Will shop with you guys again.

2012 Nissan Frontier

Perfect! The local store tried to sell me a part with voltage converter with a price tag of $80.00
They were wrong. You guys are awesome!

Nissan Frontier

I purchased a hitch, ball mount, ball and wiring for my Frontier. I thought your people were very pleasant. professional and helpful. I did have an issue with power to my lights but after watching one of your video instructions, I realized that I needed to purchase some additional in cab wiring that was shipped promptly. Just installed it and everything works perfectly. By buying your products and doing it myself, I saved about $150. Nice! Thanks


Order was shipped the same day I placed it and arrived in at my home in NC 2 days later. The hitch look great, but I haven't been able to mount it yet. The nuts welded to my Frontier's frame have rusted and it's a slow, arduous process to clear the threads. We live in the mountains & roads are frequently salted in winter. etrailer has a good video on their site regarding clearing the threads, but mine are particularly bad.

Show More Reviews

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

  • What is the Length of the Suzuki Trailer Hopkins Wiring Harness part # HM43575?
    The Hopkins wiring harness item # HM43575 has a length of 45-1/4 inches for the wiring alone and the overall length including the plugs/adapters end to end is 48-1/8 inches.
    view full answer...
  • No Power To Trailer Plug On a 2014 Nissan Frontier
    Yes, there will be fuses associated with the trailer lightning circuits on your 2014 Nissan Frontier in the engine bay fuse box. The correct locations will be listed for you on the underside of the cover but as they do not list these in the owner's manual I would have no way to look this up for you. Please let me know if the fuses do not turn out to be the culprit.
    view full answer...
  • Troubleshooting Faulty 7-Way Connector on a 2016 Nissan Frontier
    Since you have used 2 different adapters and a different pickup that does seem to point towards the wiring on your 2016 Nissan Frontier as the problem. I would try checking your connector for corrosion or debris and then your wiring; especially your grounds. If you are testing with an LED tester then there isn't much load being put on the circuits. Once you plug up your trailer it is drawing much more power (even more so if it has incandescent lights) which will expose any wiring problems...
    view full answer...
  • Wiring Harness With 4 Flat Connector for 2017 Nissan Frontier
    To add a 4 flat to your 2017 Nissan Frontier with the factory tow package you need the Hopkins Plug-In Simple Wiring Harness # HM43575. I've added a link to a video review of this part for you to take a look at as well.
    view full answer...
  • What Vehicles Does the Hopkins Plug-In Simple Wiring Harness # HM43575 Fit
    The Hopkins Plug-In Simple Wiring Harness # HM43575 is a plug-in style 4-Way flat connector that is compatible with the following vehicles: 2009 - 2012 Suzuki Equator with factory 4-Flat connector 2005 - 2018 Nissan Frontier with factory 4-Flat connector 2005 - 2012 Nissan Pathfinder with factory 4-Flat connector 2005 - 2015 Nissan Xterra without factory trailer connector A review video and the installation details have been linked for you to reference. If you have a different vehicle...
    view full answer...
  • Vehicle Wiring Harness 4-Way Flat for 2007 Nissan Xterra Relays and Pigtail
    At this time we do not have the relays and wiring connector sold separately for the Tekonsha T-One Vehicle Wiring Harness # 118525. This part is required for the 4-way flat trailer connector to function if your 2007 Nissan Xterra came from the factory without the connector and relays. The Hopkins Plug-In Simple Wiring Harness for Factory Tow Package # HM43575 that you ordered requires the relays and pigtail as well. As we do not have it separately you can contact a local Nissan dealer...
    view full answer...
  • Recommended Trailer Connector for 2009 Nissan Xterra with Towing Package
    The Hopkins Plug-In Simple Wiring Harness part # HM43575 is a great option for a 2009 Nissan Xterra with towing package and it features plug-in-play installation. It comes with the 4-way plug already attached but if you want to remove this for some reason you are free to do so but this is how they come. Please note, backup lights are only feasible with a 7-way wiring harness like the Tekonsha Vehicle Wiring Harness - part # 118282.
    view full answer...
  • Recommended 7-Way Trailer Wiring Harness for 2006 Nissan Xterra
    The Hopkins Plug-In Simple Wiring Harness # HM43575 referenced in your question is confirmed to fit your 2006 Nissan Xterra, but this will provide you with a 4-Way flat connector and not a 7-Way. In order to install a fully functional 7-Way connector on your vehicle, I instead recommend the Tekonsha T-One Vehicle Wiring Harness # 118266. This custom-fit harness will install by plugging directly into existing ports located under the vehicle, on the driver's side of your Nissan Xterra....
    view full answer...
  • 4-Pole Flat Wiring Harness for 2008 Nissan Frontier
    The # HM43575 would work as a replacement, you would need to unplug your current harness and plug in the Hopkins in the 4-pole connector slot; you can see exactly where in the photo I've provided. I've also attached a link to a video review of this product for you to take a look at.
    view full answer...
    Image 1 for
  • Parts Needed to Activate 4-Pole Trailer Wiring on 2005 Nissan Xterra
    The Hopkins part # HM43575 is a replacement for just the 4-pole harness portion of a complete kit like # 118525. This part alone does not give you an active trailer harness. The complete kit # 118525 includes the 4-pole portion, the three relays and the relay jumper harness that must be installed behind the passenger side kick panel. You can see the whole installation in the linked video.
    view full answer...
  • Troubleshooting No Trailer Running Lights Active on 2012 Nissan Frontier
    Trailer running lights not working with certain Nissan vehicles is a common problem with an easy fix. There is a relay for the trailer running light circuit that is located in the fuse box (in the cab). If that relay is missing or no longer functions then it can be replaced with # 38666-1. The relay of the running light circuit on your 2012 Nissan Frontier is in the relay harness behind the passenger floor board kick panel. If you check out the install video I attached the first thing...
    view full answer...
    Image 1 for Image 2 for
  • Troubleshooting Trailer Turn Signal and Brake Lights Not Functioning on 2011 Nissan Frontier
    Sounds like you are missing the blue relays that activate the stop/turn circuits of the trailer wiring of your 2011 Nissan Frontier which we offer as part number # 38666-1. If you check out the attached picture you can see where they install. Or you can watch the install video I attached to see how the area is accessed too. It's behind the passenger side kick panel.
    view full answer...
    Image 1 for
  • Are Relays Needed to Install Trailer Wiring in 2006 Nissan Frontier
    If your 2006 Nissan Frontier does not have the factory trailer wiring it would need relays to activate it. For that you would need the part # C56225. If you have the relays already all you would need is the part # HM43575. If you look behind the kick panel in the passenger side of the vehicle you will be able to see if the relays and breakers are there.
    view full answer...
    Image 1 for
  • Trailer Running Lights Not Working when Connected to a 2013 Nissan Frontier
    On many Nissan vehicles there is an additional running light relay, # 38666-1, that is needed for the trailer running lights to work. It is normally located in the in-cab fuse panel. Nissan does not list fuse and relay locations in the owner's manual for the 2013 Frontier so you would have to check the fuse panel lids to see if there is a bad or missing relay.
    view full answer...
  • Replacement Wiring Harness for 2014 Nissan Frontier
    There is a replacement harness you can use in your 2014 Nissan Frontier with factory 4-flat but it will not plug into what you are holding. Instead you would need to use the Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector # HM43575, which is designed to be a replacement for your current harness. I also recommend using mounting brackets # 18140 and # 18144 for this harness. I've added links to video reviews of each product for you to take a look at as well.
    view full answer...
    Image 1 for
  • Recommended Trailer Hitch Receiver to Fit a 2013 Nissan Xterra
    We carry two trailer hitches that are confirmed to fit your 2013 Nissan Xterra,the Curt Class III Trailer Hitch Receiver, # 13514, and the Draw-Tite Max Frame Class III Trailer Hitch Receiver, # 75291. Of these two hitches, I recommend the Curt hitch over the Draw-Tite hitch for your Nissan Xterra. Both hitches are designed to custom-fit to bolt on to your vehicle with no drilling or welding needed. Both hitches are Class III hitches and have the 2 x 2 inch receiver opening. The Curt...
    view full answer...
    Image 1 for
  • Replacement Factory Trailer Plug-In for a 2011 Nissan Xterra
    If your 2011 Nissan Xterra has the factory tow package with the 4-Way flat connector then you will simply need to use the Hopkins # HM43575 which will plug right into the factory connector. If instead you have a 7-Way connector, like what comes in the T-One Kit # 118266, then you will want to use the Tow Ready # 118267.
    view full answer...
  • Troubleshooting 2016 Nissan Frontier Trailer Wiring with No Turn Signals
    Thank you for describing the trailer lighting issue you're having and the testing/troubleshooting steps you've taken to diagnose the cause. If I understand correctly you have a 4-pole harness such as # HM43575 which does indeed plug in to the OEM tow package wiring under the vehicle. For reference I linked a photo of this item's OEM plug which should match what is on the Frontier. Since you have tested the contacts on the vehicle plug where this item connects (with a tester like # PTW2992)...
    view full answer...
    Image 1 for Image 2 for
  • Will Hopkins 4-Way Trailer Connector Fit Brophy Mounting Bracket # BK4F
    Brophy mounting bracket # BK4F is designed to fit a standard 4-Way flat trailer connector so I don't see any reason why it wouldn't work with Hopkins wiring harness # HM43575.
    view full answer...
  • Will the Hopkins Plug-In Simple Wiring Harness # HM43575 Fit a 2006 Nissan Xterra
    Yes, the Hopkins Plug-In Simple Wiring Harness # HM43575 is compatible with your 2006 Nissan Xterra without the factory trailer connector. This will work great on your Xterra and will allow you to add lights to your 24x60 Pro Series Cargo Carrier # 63153 that you referenced. The lights that I recommend for your carrier is the LED Light Kit part # 98174LED. If you check out the attached installation video you can see that we install this same kit on the same carrier that you have. Installation...
    view full answer...
  • Where Are the Relays for Trailer Wiring Plugs on 2019 Nissan Frontier
    I've included the link to one of our installation videos on the 2019 Nissan Frontier that uses the Curt # C56225, which comes with the relays included; these relays can also be purchased using part # 38666-1. If you fast forward to around the 3:00 mark of the video it shows where the relays are located and how you'll install them, as well as the installation of the 4 way connector. The Hopkins Plug-In Simple Wiring Harness # HM43575 is designed for vehicles that came equipped with the...
    view full answer...
  • Troubleshooting 4-Way Connector on 2010 Nissan Pathfinder Not Working
    You can first try pulling the relays that you mentioned on your 2010 Nissan Pathfinder and replacing them to see if that fixes your problem. You can do so with the Curt Relay Kit # C57000 (some Nissan vehicles will require a 3rd blue relay # 38666-1). If that fixes it then you are good to go. If not, then I recommend installing the Hopkins Plug-In Simple Wiring Harness for Factory Tow Package # HM43575 which will simply replace your current 4-Way. You will uninstall your current 4-Way...
    view full answer...
  • Differences of Vehicle Wiring Harness For A 2009 Nissan Frontier
    The Tekonsha T-One Vehicle Wiring Harness # 118525 is for adding a 4-way flat trailer connection to your 2009 Nissan Frontier that did not include a 4-way or 7-way connection from the factory. The kit includes the relays and connectors necessary for the trailer lights to work off the 4-way. The converter is in reference to some vehicles needing a powered converter to function properly. This device will plug into the battery and will act as a relay to send power to the trailer lights from...
    view full answer...
  • Trailer Lights Do Not Work With 2012 Nissan Frontier
    Since some of the lights on your trailer are not working with your 2012 Nissan Frontier, the first thing to do is take a look at your owner's manual to locate any trailer fuses or relays and ensure they are all there and in working order. If they are, in order to determine the specific problem you will need to purchase a circuit tester if you do not have one - the very handy Cordless Circuit Tester # PTW2979 is my recommendation due to how easy it is to use - and test the connector on your...
    view full answer...

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Info for this part was:

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Expert Research:
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Employee Adam R
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