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  4. Trailer Hitch Wiring
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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 # HM43125
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Custom Fit Vehicle Wiring

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Hopkins Custom Fit Vehicle Wiring - HM43125
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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 - no cutting or splicing required. 1-800-940-8924 to order Hopkins custom fit vehicle wiring part number HM43125 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 Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (42)
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Hopkins Custom Fit Vehicle Wiring - HM43125

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • 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 - no cutting or splicing required.


Features:

  • 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 - no cutting or splicing
    • Locate connection points behind tail lights
    • Plug in connector
  • Includes a tail light converter to ensure that your vehicle's wiring matches that of your trailer
  • Protective connection terminals resist corrosion
  • Comes with dust cap for 4-way flat connector, cable ties, and terminal grease packet for electrical connections


Specs:

  • Maximum amperage:
    • Stop/turn lights: 2.1 amps per circuit
  • 90-Day limited warranty


Installation

This custom-fit T-connector plugs into your vehicle's wiring harness, which is located behind the driver's-side and passenger's-side tail lights. You will have to remove the tail light assemblies to access this harness.


T-One Connection Location Points Behind Tail Lights

Once installation is complete, the 4-way flat 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.


Tail Light Converter

A tail light converter is built into this T-connector. 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.



43125 Plug-in Simple Hopkins T-Connector with 4-Pole Trailer Connector

Installation Details HM43125 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 Custom Fit Vehicle Wiring - Trailer Hitch Wiring - HM43125 Review

Today we are going to be taking a look at the Hopkins plug in simple vehicle wire and harness with a 4-pull flat trailer connector. This product fits certain years of the Honda Ridgeline. It's going to provide a 4-way flat trailer connector at the back of the vehicle to power your trailer signal lights. This is compatible with 5-pull, 6-pull, and 7-pull adapters. The adapters are sold separately. It comes with a dust cap for the 4-way flat connector, that way you can cover up the connection points when your plug is not being used. The unit also features protective connection terminals to resist corrosion.

It's going to include your taillight converter. That's this small black box right here. This is designed to insure that your vehicle's wiring matches out of your trailer's and prevents overloads. The system's designed to connect quickly and easily. You don't have to worry about cutting or splicing any wires.

Just locate the connection points behind the vehicle's taillights at the back of the vehicle, and plug in your T-connectors. This one right her with the yellow wiring is going to go to the driver side. The one with the green wiring is going to go to the passenger side of the vehicle. The plugs on the harness are going to match up perfectly with the ports on the vehicle. They are going to plug in and they are going to snap lock together for a nice, tight, secure fit. Once you have that done, you can go ahead and make a ground connection.

The ground wire is going to be your white wire with a ring terminal attached to it. You want to get that grounded to a nice, clean, metal surface with the included grounding screw, and then you can go ahead and mount your converter box to a nice, out of the way location using the included cable ties. Once your installation is complete, the 4-way flat connectors are going to be stowed beneath the vehicle near the trailer hitch. We do recommend using a mounting bracket to keep the connector easily accessible as well as secure. Mounting brackets are sold separately, so if you're interested or if you're in need, you can check out some options here at e-trailer.com. It's also recommend that you use a small amount of grease on all of your electrical connections, like the plugs on the vehicle and the 4-pull connector itself.

The grease is going to really help prevent corrosion to the connection points. The kit does come with a packet of grease to apply to those connection points. When it comes to the maximum amperage for the stop and turn lights, we're looking at 2.1 amps per circuit. The unit also comes with your detailed installation instructions to help walk you through the process step by step. That's going to do it for today's look at the Hopkins plug in simple vehicle wire and harness with a 4-pull flat trailer connector.


Customer Reviews

Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - HM43125

Average Customer Rating:  4.8 out of 5 stars   (42 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.

by:

Installed easily, works as expected

I
will recommend to anyone needing a harness.



by:

Awesome customer service and installed exactly as planned.



by:
2013 Honda Ridgeline

Superb customer service; professional, knowledgeable, very helpful. Great pricing. Fast shipping for a product that fits like a glove my Honda pick up track. Thank you George and co.!. Did not know about etrailer before but I recommend it from my hart.

Constantin Stefan


Comments
That’s the kind of review we love to hear Constantin!! Hopkins appreciates your business and we are grateful you purchased our Wiring Harness. If you have any concerns or questions, please get in contact with etrailer customer service. Thank you!
Hopkins C from - 06/23/2017

Comments
It is a pleasure to find out that there are some courteous people like you. Although a year later, your kind message is well received!
Constantin S - 06/18/2018


by:

My hitch (& wiring harness) arrived today and based on my research hands down this is the way to go for hauling. I look forward to doing just that. Even more impressive was the customer service I got from Katrina at etrailer when I called to place my order. She was patient, thurough and took the extra time to make sure I was satisfied we had all the right parts. If Katrina is any indication of how they do business at etrailer I will be back for more accessories without question. Happy trails.


Comments
Thanks for the great review on our Plug-In Simple Wiring Harness, Scott!!! We at Hopkins think that you will be pleased with this product. Thank you!
Hopkins C from - 05/19/2017


by:

Product was as advertised. Installed it the day I got it and it works great. Really needed it for this weekend since I needed my lights on my trailer to work properly. Thankyou for the fast delivery. I will be doing business with etrailer again.


Comments
Works very well for my Honda Ridgeline.
Robert - 02/25/2019


by:
2008 Honda Ridgeline

Etrailer is a great seller. The Honda trailer wiring harness, was spot on, fit perfectly.


Comments
That what we love to hear Phil!!! Hopkins appreciates your business and we are grateful you purchased our HM43125 Wiring Harness. If you have any concerns or questions, please get in contact with us. Thank you !
Hopkins C from - 04/27/2017


by:
2006 Honda Ridgeline

Wiring kit went in within 30 minutes start to finish. Little unhappy that the light converter is dangling behind the light assembly since there was no place to secure it, but it will work as is. Even with that, I still recommend the kit.


Comments
Had one small issue after the installation of the wiring kit which left me with an intermittent reverse light on the left side. After a bit of diagnosing, I found that the connectors in the block had backed out and werent making a positive connection. Not really related to etrailer but more from the manufacturer of the kit. Even with that annoyance, I would still recommend the kit.
N - 10/02/2019


by:
2008 Honda Ridgeline

The wiring harness came with electrical grease and zip-ties, installation was a snap on my ridgeline!



by:
2007 Honda Ridgeline

PRODUCT ARRIVED IN TIMELY MANNER, HOWEVER TIGHT FIT - WE NEEDED TO CONNECT IT TO A BOAT TRAILER AND PULL IT INTO PLACE IN ORDER TO GET THE HOLES TO ALIGN, OTHERWISE SEEMS GOOD. LIGHT KIT WAS EASY TO INSTALL AND TOOK JUST A FEW MINUTES...



by:

Good communication and fast shipping. Excellent hitch, perfect fit. The Hopkins wiring kit was a breeze. Will keep ordering from etrailer.



by:
2012 Honda Ridgeline

Delivered a day sooner than the expected delivery date. Easy installation, especially after watching the video available on the site.


Comments
Hello Pete G!! Thank you for purchasing our Wiring Harness. Hopkins really appreciates your business and we are looking forward to doing more business with you in the future.
Hopkins C from - 06/23/2017


by:

Easily installed. Installed a year ago and still working perfectly.


Comments
Great! No problems at all.
Daniel G - 03/20/2021

by:
2013 Honda Ridgeline

Excellent products and no problems installing on my 2013 Ridgeline. I highly recommend.


Comments
Still working great and I still heartily recommend.
Chris - 04/16/2020

by:
2014 Honda Ridgeline

Everything was great, and the video on eTrailer made it even easier. Only one complaint-- and this isn't eTrailer's problem, but the part manufacturer-- there was no two-sided tape to stick the module on the sheet metal. I had to run out and get a roll in the middle of this job.



by:
2014 Honda Ridgeline

Trailer light harness connected perfectly very easy to install.



by:
Honda Ridgeline

Perfect fit to my Ridgeline. No issues at all. Works with my trailer perfectly.



by:
2014 Honda Ridgeline

Good quality part. Hooked up quickly with no hiccups. Install video helped so I had an idea of what I needed to do. I added some wire loom and push wire ties to make the job more clean and professional looking.



by:

Good product, well made, all wires were correct length. It replaced my faulty converter perfectly. Lights working good now. Shipping was very quick also... Thank you so much!



by:

Im happy with this product easy to install and works great, thank you!!



by:

Came as expected, matches the OEM connector I was looking for perfectly.



by:
2006 Honda Ridgeline

So easy to install and I am electrically [challenged]. You can do it yourself.



by:

Easy to install, instructions were clear.



by:
2008 Honda Ridgeline

Great product and very easy installation.



by:
2008 Honda Ridgeline

This product is Excellent. Install took me about 20 minuetes, of course i was in a rush but took me no time at all. Everything fit together perfect and running the wires was much less of a task then anticipated. Solid Product!



by:

All good. A+ in every regard. Tough as nails. Still in use and will be for quit some time, I'm sure.


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Show More Reviews

Ask the Experts about this Hopkins Custom Fit Vehicle Wiring

  • Troubleshooting Hopkins Plug-In Wiring Harness HM43125 In 2013 Honda Ridgeline That Keeps Gong Bad
    I am sorry you have had issues with the Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # HM43125 you have installed on your 2013 Honda Ridgeline. To make sure the harness stays in good working order for multiple years I recommend double checking that you are routing the harness in a way that it is not too close to the muffler that could cause the wiring to be damaged and cause the module to go bad. Do you tow just one trailer, or multiple trailers? If...
    view full answer...
  • Can Trailer Wiring Harness Cause Dash Lights To Malfunction When Brakes Are Applied
    If you have the correct trailer wiring harness for your 2013 Ridgeline, there should be no issues with the dash lights on the vehicle when the brakes are applied. The wiring harness I recommend for your vehicle is the Hopkins # HM43125. This simply plugs into the connection points located behind the vehicle taillights. I recommend unplugging the harness you have and make sure it is designed as a fit for your vehicle. If it is not then I recommend returning it tot he retailer and using...
    view full answer...
  • Vehicle Wiring Harness For a 2013 Honda Ridgeline For a 4-Way Flat Trailer Connector
    It sounds like the Tekonsha OEM Replacement Vehicle Wiring Harness with 7-Way Trailer Connector # 118253 is the wiring kit you found for your 2013 Honda Ridgeline. Most people will choose to use an Adapter # 37385 to go from the vehicle 7-way to trailer 4-way flat connector. I find using the 7- and 4-Pole Trailer Connector Socket w/ Mounting Bracket # HM40975 as being the better option. This connector will replace the 7-way that is included in the Tekonsha Kit # 118253 and you will not...
    view full answer...
  • Adapter to Connect 4-Way on Car to 7-Way on Trailer
    There is an adapter available for the Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # HM43125 that fits your 2013 Honda Ridgeline. All you need is the Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector # 30717; you can just plug this into the 4-way and tie off the additional wires you are not using. I strongly recommend using Dielectric Grease # LT37534 to help stop any corrosion between the two connectors. You will also want to use Mounting Brackets...
    view full answer...
  • Recommended 7-Way Trailer Connector And Brake Controller For 2014 Honda Ridgeline
    For your 2014 Honda Ridgeline, if you have the wire connection at the rear bumper just above your exhaust, I recommend the Tekonsha Honda Replacement OEM Tow Package Wiring (7-Way) w/ Circuit Protected ModuLite HD Module, # 118253. If you don't have the trailer connector wiring connector, I recommend the Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector, # HM43125. This will give you a 4-way connection at your bumper using quick connects located behind...
    view full answer...

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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Cole B
Installed by:
Cole B
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Alexander C
Written by:
Alexander C

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