bing tracking image
  1. Trailer Wiring
  2. Hopkins
  3. Trailer Connectors
  4. Trailer End Connector
  5. 4 Flat
  6. Plug and Lead
Hopkins Endurance 4-Way Flat Trailer Wiring Harness - 30' Long

Hopkins Endurance 4-Way Flat Trailer Wiring Harness - 30' Long

Item # HM48265
Our Price: $27.50
You Save: 19%
Trailer Wiring
Orders above $50 qualify for Free Shipping
Shipping Weight: 1.1 lbs
In Stock
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Customer Photos

Need help with installation?
Locate installers near me
Wishbone-style Y-harness features a 4-pole flat connector with a convenient, simple-to-use, easy-pull grip for effortless disconnect. Rust-resistant terminals are further protected by a molded dust cover, and all wires are color coded. Great Prices for the best trailer wiring from Hopkins. Hopkins Endurance 4-Way Flat Trailer Wiring Harness - 30' Long part number HM48265 can be ordered online at or call 1-833-496-1390 for expert service.
  • All Info
  • Reviews (20)
  • Q & A (0)
  • Photos
  • Why etrailer?

Hopkins Trailer Wiring - HM48265

  • Trailer Connectors
  • Trailer End Connector
  • 4 Flat
  • Plug and Lead
  • 21 - 30 Feet Long
  • Hopkins

Wishbone-style Y-harness features a 4-pole flat connector with a convenient, simple-to-use, easy-pull grip for effortless disconnect. Rust-resistant terminals are further protected by a molded dust cover, and all wires are color coded.


  • Provides simple, efficient method for rewiring your trailer with a 4-way flat trailer-end connector
  • Wishbone design - Y-harness contains 2 separate, brown tail light wires
    • Left-side tail light wire is bundled with the yellow left turn/brake wire
    • Right-side tail light wire is bundled with the green right turn/brake wire
  • Easy-pull, ergonomic grip on connector makes disconnecting a snap
  • Heavy-duty connector housings have built-in mounting holes
  • Tin-plated terminals resist corrosion
  • White grounding wiring included
    • Serrated ground terminal ensures proper grounding
  • Nylon sleeve and heat-shrink tubing protect wires


  • Connector: 4-way flat
  • Harness length: 30'
  • Ground wire length: 36"
  • Wire gauges:
    • Green: 18
    • Black: 18
    • Brown: 18
    • Yellow: 18
    • White: 16
  • 3-Year warranty

48265 Hopkins Endurance 4-Wire Flat Y-Harness

Installation Details HM48265 Installation instructions

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Hopkins Endurance 4-Way Flat Trailer Wiring Harness - 30' Long - HM48265

Average Customer Rating:  4.9 out of 5 stars   (20 Customer Reviews)

Wishbone-style Y-harness features a 4-pole flat connector with a convenient, simple-to-use, easy-pull grip for effortless disconnect. Rust-resistant terminals are further protected by a molded dust cover, and all wires are color coded.


I purchased the Hopkins wire harness 48265 based on positive reviews. This is going on a vintage camper trailer that we rebuilt the back end. The back sheet metal that the tail lights mount to was replaced with new sheetmetal. Old wiring was routed to back and new sheet metal was installed, then lights were wired. I wanted to use a sheet of silicon seal on tail lights and that causes a grounding issue. So now ground wires will have to be run to frame. Since back sheet metal has to come back off, decided it was time to replace the wire system. Since it is hard to get at the wiring for the tail lights, it was important for me that I use a quality harness. This harness had the 18 gauge wire with 16 gauge for ground. Some harnesses were 20 gauge wire and reviews for those was described as cheap and concerns that it wouldn't last but a few years. Everything I read about the Hopkins 48265 was positive. If the wire set is as good as the quick attention I received fron Etrailer, I m sure it will be 5 star. Thanks to the people at Etrailer. Kev


High quality, does everything advertised, easy to use. Very pleased with the purchase.


Worked great! The length allowed me to run it where the install was inconspicuous.


Good selection, well organized. Customer service available and very capable.


This wiring harness made the job much easier. Will need another one for a different trailer soon. Thank you!


Met Expectation - Product delivered per estimated delivery time; wiring harness length is good for my trailer.


The harness has been working fine, if we can only keep mice away from the trailer things will be even better.


Super fast delivery. Great and easy web site.


Fast Shipping, product was exactly what I ordered, Nice site layout.

Michael - 06/19/2019


I was well pleased with this product it was easy to install work really great save me a lot of time thanks .


Needed To Replace 15 Year Old Wire, This Is What i needed ,Perfect!


perfect good price worked thank you


Still working great and easy to install.




Worked very well and was easy to instal l.


Worked very well, no problems at all.


The item is what I expected it to be.


great product



See what our Experts say about this Hopkins Trailer Wiring

  • What Wire Gauge Is Used With Hopkins Endurance 4-Way Flat Trailer Wiring Harness
    The wires included with the Hopkins Endurance 4-Way Flat Trailer Wiring Harness, part # HM48265 are all 18-gauge. Most 4-way wiring harnesses will be a 16 or 18 gauge wire. The lower the number, the bigger the wire, so the 18 is bigger than the 20-gauge you asked about.
    view full answer...
  • Length of White Wire on Hopkins Endurance 4-Way Harness # HM48265
    I went out to our warehouse and measured a length of 34-1/2 inches for the white ground wire from where it comes out of the back of the 4-Way on the Hopkins Harness # HM48265. The white wire is 16 gauge. I have attached a short video review that you can check out as well.
    view full answer...
  • Do I Need To Run Separate Wires To Each Tail Light For the Running Lights On a Trailer?
    You can route the wiring in either orientation. A harness like the Hopkins Endurance 4-Way Flat Trailer Wiring Harness # HM48265 is referred to as a wishbone harness and comes with 2 separate brown wires that are bonded to the corresponding green and yellow wires for running down both the left and right sides of the trailer. This is best when you have a trailer like a boat trailer where it is harder to protect the wire running across the rear of the trailer.
    view full answer...
  • Trailer Taillights Not Illuminating With Hopkins Wiring Harness On 2016 Dodge Grand Caravan
    In most cases when only one function is not working properly or intermittently it means there is a bad ground connection somewhere on your setup. I would double check the ground connection on the vehicle Hopkins plug part # HM11141995 to make sure it is grounded to a clean bare metal surface free of debris or paint. Grounding issues tend to show up most with the running light circuit because those lights remain on continuously and so they draw more current. You also want to make sure the...
    view full answer...
  • Recommended Trailer 4-Way Wiring Harness For a 6' X 12' Utility Trailer
    I recommend the Hopkins Endurance 4-Way Flat Trailer Wiring Harness # HM48265. This harness uses a wishbone design so that you will have conductors for your running lights and tail lights that run down each side of your utility trailer. Since your Side Marker Trailer Lights # MC35AEB, Peterson Tail Lights # 432400 and Peterson Identification Light Bar # 428100 are designed to ground on the frame this harness also uses a frame mounted ground. The entire harness is 30' long ensuring you will...
    view full answer...
  • How to Install Ground Wire To Trailer Connector on Utility Trailer
    Grounding through the ball doesn't work well, as you've found. If the current harness doesn't have a ground circuit, the wiring must be fairly old as it's pretty typical for a trailer connector to have a ground circuit. The fact that you're blowing fuses leads me to believe you might also have a short circuit in one or both your turn signal/brake lamp circuits. You'll want to replace the existing wiring harness on the trailer. This is pretty simple to do, and will only take an hour or...
    view full answer...
  • Recommended Replacement 4-Flat Wiring Harness
    From the image you attached, I think what you have is each of the taillight circuits on your 4-way have two wires ran to them for each side of the trailers wiring. You can wire the two wires of each pin to the single wires of a new 4-way allowing the circuits to get the same signal. Depending on how much of the wiring length needs replaced, you can use the Hopkins Endurance Easy-Pull Harness w/ 4-Pole Flat Connector, # HM38134 for a short length. If you have damage to the last few feet...
    view full answer...
    Image 1 for
  • Trailer Wiring Harness Compatible with Peterson 435800 Trailer Stop/Turn/Taillight
    We don't offer a plug and play trailer harness that would plug directly into the Peterson # 435800 trailer taillight. The lamp includes a 3 pin pigtail that would plug into the rear of the lamp which would wire directly into the trailer wiring. If you need a 4 pole harness for your trailer, we offer them in varying lengths. • For a 20 foot harness, use part # A20WB • For a 25 foot harness, use # A25W2GWB • For a 30 foot harness, use # HM48265 • For a 35 foot harness, use # A35W42B To...
    view full answer...
  • Recommended Wiring and Lights for Utility Trailer
    I'm assuming you want to replace everything here so I will start off with a 4-way. I recommend using the Hopkins Endurance 4-Way Flat Trailer Wiring Harness - 30' Long # HM48265. This will give you a lot of wire to work with so you can hook up all of your lights. This uses your typical 18 gauge wire for the lights and 16 gauge for the ground. If you need additional wire you can use the # SWC97FR or # DW02923-1. You could use the Self-Stripping Connector with Waterproof Sealant - 14-18...
    view full answer...

Do you have a question about this Trailer Wiring?

  • Why

    At we guarantee:
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate trailer wiring information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Employee Cole B
Installed by:
Cole B
Employee Robert C
Installed by:
Robert C
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Chris R
Video Edited:
Chris R
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
Updated by:
Alexander C
Employee Hannah L
Updated by:
Hannah L

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.