bing tracking image
  1. Trailer Wiring
  2. Hopkins
  3. Trailer Connectors
  4. Trailer End Connector
  5. 4 Flat
  6. Plug and Lead
Hopkins Endurance Easy-Pull Harness w/ 4-Pole Flat Connector - Trailer End - Jacketed - 48"

Hopkins Endurance Easy-Pull Harness w/ 4-Pole Flat Connector - Trailer End - Jacketed - 48"

Item # HM38134
Our Price: $20.13
You Save: 8%
Trailer Wiring
Shipping Weight: 0.35 lbs
Add to cart
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
Easily disconnect this 4-way flat trailer-end plug from your vehicle without damaging the terminals. Large grip ring provides maximum leverage when disconnecting. Harness splices into your trailer's wiring. Durable cable covering resists damage. Great Prices for the best trailer wiring from Hopkins. Hopkins Endurance Easy-Pull Harness w/ 4-Pole Flat Connector - Trailer End - Jacketed - 48" part number HM38134 can be ordered online at or call 1-800-940-8924 for expert service.
  • All Info
  • Reviews (106)
  • Q & A (0)
  • Photos

Hopkins Trailer Wiring - HM38134

  • Trailer Connectors
  • Trailer End Connector
  • 4 Flat
  • Plug and Lead
  • 0 - 5 Feet Long
  • Hopkins

Easily disconnect this 4-way flat trailer-end plug from your vehicle without damaging the terminals. Large grip ring provides maximum leverage when disconnecting. Harness splices into your trailer's wiring. Durable cable covering resists damage.


  • 4-Way flat trailer-end connector plugs into the 4-way flat on your vehicle
  • Easy-to-pull ring makes 4-way easy to disconnect
    • Ring handle makes it easy to pull connector straight back for proper leverage
      • No wiggling plugs or damaging terminals
    • Wide handle makes it easy to grip connector
  • Protective cable sleeving is durable and insulated
  • Simple installation - hardwire to existing trailer wiring
  • Corrosion-resistant terminals are long-lasting


  • Ring inner diameter: 1"
  • Ring outer diameter: 1-7/8"
  • Wiring harness length: 48"
  • Wire configuration:
    • White: ground wire
    • Yellow: left turn/brake light
    • Green: right turn/brake light
    • Brown: tail lights
  • 3-Year limited warranty

Easy-Pull Ring Handle Is Easy to Grip and Pull

Easy Pull

Standard 4-way flat plugs have a small surface area to grip when you are pulling them apart, forcing you to wriggle the plugs back and forth to loosen them. Some users even pull on the wires. This can lead to broken terminals or ripped wiring. With the Easy-Pull harness, the plug has a large grip ring designed to make disconnecting a snap. Simply slide your finger into the ring and pull the plug away from the opposite plug to disconnect.

Easy Pull Rings

The Easy-Pull is also available as a vehicle-end 4-way flat plug. Combine the Easy-Pull trailer-end plug and vehicle-end plug for the easiest possible disconnection. With ring handles on both connectors, disconnecting is as simple as gripping the rings and pulling straight apart. No wriggling, no broken terminals, and no damaged wires.

38134 Hopkins Easy Pull 4-Pole Flat Trailer Wire Harness with Jacketed Cable - Trailer Side - 4' Long

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Hopkins Endurance Easy-Pull Harness w/ 4-Pole Flat Connector - Trailer End - Jacketed - 48" - HM38134

Average Customer Rating:  4.7 out of 5 stars   (106 Customer Reviews)

Easily disconnect this 4-way flat trailer-end plug from your vehicle without damaging the terminals. Large grip ring provides maximum leverage when disconnecting. Harness splices into your trailer's wiring. Durable cable covering resists damage.


The parking lights did not work after installation. Tested with multimeter found a short in the brown wire. A cheap product would not recommend.

Etrailer Expert

Brooke M.


I will have our customer service team reach out to you about this. Thanks for letting us know!


The harness connected well with the other components and the plug mates easily when hooking up the trailer with the tow vehicle.


Great product, hope it last a long time, the old wires were getting a bit worn out. I really like the loop to make it easier to unplug without putting too much strain on the connector.



It did well for a while, but within a few months, the pins began bending from just the weight of the small flap on my Ram pickup that covers the 4-pin connector. I switched to using a big 7-pin to 4-pin adapter and it lasted a couple more years. This weekend, it finally gave up the ghost and one of the pins came off in the adapter. I was able to fish it out and wired up an old plug I had stashed away just in case. Im trying to decide if I should buy another, but am not too sure I want to spend so much for something that will need to be replaced as often as a $2 plug!


Really like the heavier construction jacket and pull ring since it will be installed on a snowmobile trailer.


The Hopkins 4 way trailer wire connector is very well designed and manufactured. It is enough of an improvement over a standard connector that I recommend replacement of an undamaged standard connector.


Absolute hot garbage. Arrived defective and never worked. A complete waste of money. If i could give zero stars i would. For $20 for a 4 pin plug you would think they test them before shipping.

Etrailer Expert

Jenny N.


Goodness me! This 4 pin connector does have a 3 year warranty. I will have our Customer Service team reach out to you.


Allows for easy insertion and removal without pulling on harness. Works great!


The wiring was just what I needed and the shipping was quick. I will definitely be using etrailer more in the future.


This is a great solution to a 4 wire plug for my trailer! Regular 4 wire plugs tend to fatigue over time. This rugged design is sure to last many years


So much easier to use with the large pull handle. Great for use when your Trucks harness is in a tough to reach place



Still a great harness. Very durable





Part as described and will meet my needs


Not as durable as I thought it would be. I like the open hole design for easy plugging and removing, but the connection pins to the assembly themselves are subpar. I have a folding tongue and secured this onto a holder, when closing the arm, it folded the pins downward. After realizing the interference, i moved it to an upward position to allow for clearance but the damage was done. The pins bent and are now loose. Had to replace the entire harness.


This is a great product, solid and great quality. Three things that would help the consumer. First thing would be to add solder-less connectors. Next thing would be to have about 6-8” of exposed wire to work with when coupling. And last thing would be to furnish a dust cover for the plug end.



I couldn’t be any more happy. It has held up to many fishing trips on my boat trailer, great!


exactly as pictured, quick delivery


Heavy Duty Trailer plug for my boat trailer! Fast shipping!


Exactly what I wanted. Excellent quality. Couldn’t find it anywhere. Etrailer had it !



Still working as new.


Connector works well. I thought the wire gauge was 14, but it appears to by 16?


Nice solid, molded grab handle. I’m switching all my 4 wire trailers over to these harness. Well made

Ray C.


Have not had one issue in the year since I installed them. A+. Worth the extra cost


A real upgrade to typical 4 wire trailer connectors. If you are doing any trailer wiring I strongly recommend this replacement.

Well made with an integrated cover like a outdoor extension cable the ring makes it easy to hold when inserting or removing the connection from your vehicle.

It would be perfect if it came with the very fine cover that Hopkins includes with most other variations of the "ring" style connector.


Heavy duty. Finger hole make it more likely it will not get pulled out by the cable. Works good on our smaller trailers.


Love the finger loop. Next time I need to replace my trailer light plug this will be my choice.



Excellently. Love the ring!


very heavy duty trailer pigtail cable. This is what I need to prevent kinks and breaks in the wiring harness. Nothing like hooking up trailer lights that dont work because the wiring is easily damaged.


This connector is much more robust than standard flat pigtails. I particularly like the sheathed cable rather than the exposed flat four-wire.



Working perfectly. The hole pull works far better than yanking on the wire leads when disconnecting


Great price, fast delivery and great customer service!


Great product!!

Show More Reviews

See what our Experts say about this Hopkins Trailer Wiring

  • Solution for Needing Longer Version of Hopkins Endurance Easy Pull 4-Way
    We don't have the 72 inch version but for a longer option we do have the part # HM38136 which is 25 foot long and could be cut down shorter if needed.
    view full answer...
  • Matching 4-Way Recommendation to Fit the Hopkins # HM38134
    For the connector that will mate up to the Hopkins # HM38134 that you referenced that has the pull ring and the cover you are interested in you'd want the part # HM48044 for a 48 inch long version.
    view full answer...
  • 4-Way Trailer Wiring Kit Recommendation for 2009 Mazda MX-5
    A 6-pole flat connector is not a common style of trailer wiring connector so we do not have any adapters to go from a 4-way to a 6-pole flat. Best option would be to install the Hopkins trailer wiring kit part # HM11141824 and then remove the 6 way and install a 4-way in it's place with the part # HM38134.
    view full answer...
  • Installing a 4-Way on a Trailer that has a Green, a Yellow, a White, and 2 Brown Wires
    It sounds like you have the typical wire colors for your trailer (see attached picture). If that is the case then you will need to do exactly what you are talking about to install a 4-Way connector on your trailer like part # HM38134. The Brown wire should be the running lights which will need to be spliced together and then connected to the Brown wire on the 4-Way harness. You can verify that you are connecting everything correctly by verifying that the functions on the Tekonsha T-One...
    view full answer...
    Image 1 for
  • How to Splice in Replacement 4-Way Trailer End Connector
    To splice in a trailer end connector such as the 4-Pole Trailer End Connector # 18004 or Hopkins Endurance Easy-Pull Harness w/ 4-Pole Flat Connector - Trailer End # HM38134 you will need to match the connector to your wires by function. On these connectors, the brown wire is the tail lights, the green is right turn/brake light, the yellow is left turn/brake light and the white is ground and your connector will likely be the same. Since your damaged plug does not have these you can either...
    view full answer...
    Image 1 for
  • Can 4-Way Flat be Used as Tow Bar Lighting Connector
    Sounds like you'd just need to wire in the part # HM38134 to the wiring on your vehicle in place of the 4-way round so that your 4-way wiring can attach directly to it. If this was not what you are looking for let me know more info on what you have so that I can check further. I'd need to know the connector at the rear of your tow vehicle, the connector at the front of your towed vehicle, and what connectors are present on your coiled adapter.
    view full answer...
  • What Size Wire Gauge Do 4 Pole Connectors Use
    The Hopkins Endurance Easy-Pull Harness w/ 4-Pole Flat Connector # HM38134 you referenced has 18 gauge wires for the brown (taillight), green (right turn and brake), and yellow (left turn and brake) wires. The white (ground) is a 16 gauge wire. Typically 18 or 16 gauge wire is sufficient to run trailer lights, especially when you use LEDs since they draw much less power than incandescent bulbs. For similar trailer connector that has all 16 gauge wire the Wesbar 4-Pole Flat Connector w/...
    view full answer...
  • Right Turn Signal Does Not Work on Trailer
    There's a few options here, either a ground or bad wire, like you said, or the 4-way on your trailer has corroded. So start easy and check your trailer connector for corrosion, which can be green or white in color. A build-up of corrosion can interfere with the signals getting through the connectors so if it is present you are going to need to replace the trailer connector with a new 4-way, either # HM48133 or # HM38134. Then you can check and see if you have a damaged wire (though I doubt...
    view full answer...
  • Identifying 4-Way Trailer Wiring For Connecting To New Trailer Side Connnector
    The wires on your trailer sound abnormal for a typical trailer. I recommend either tracing each wire to determine what function it serves or using a battery to power the wiring. The Hopkins Endurance Easy-Pull Harness # HM38134 is one of the better connectors to use. It has the pull ring that will reduce the chance of damage to your wiring in the future. For the vehicle side your white wire is typically the ground, yellow left turn/brake, green right turn/brake and brown is the running...
    view full answer...
  • How To Wire LED Trailer License Plate Light For Cargo Carrier To A 4 Way Flat
    I have a solution for you to hook up the Optronics LED Trailer License Plate Light w/ Bracket # LPL55CB to your 2021 Subaru Ascent without tapping into the wiring. You could install Hopkins Endurance Easy-Pull Harness w/ 4-Pole Flat Connector - Trailer End - Jacketed - 48" # HM38134 into the 4 way flat plug at the back of your vehicle which would provide you with 4 bare wires. You could then wire the white ground wire on the LED lights to the white wire on the Hopkins 4 way harness. Then...
    view full answer...
    Image 1 for Image 2 for
  • Trouble With Trailer Lights Flashing Off and On When 4-Way Connected
    It sounds like the problem is in the wiring on the 4-flat connection of the trailer. I recommend the Hopkins Endurance Easy-Pull Harness # HM38134 to replace the 4-way plug on your trailer. I'm guessing that there many be a connection issue at the 4-way or the ground wire inside the harness broke and this is what is causing your lights to flash. That is the last point and explains why your lights all work when you ran a dedicated ground wire to the battery. You can confirm that it is...
    view full answer...
  • Replacement Jack Wheel For A Reese Trailer Jack
    For your Reese 74410 Trailer Jack, you can use the Removable, 6" Poly Caster Assembly for etrailer or Ram Jacks # JWK-6P to replace your current wheel. This wheel has a maximum weight capacity of 1,000-1,200-lbs, has a diameter of 6" and a thickness of 2". We do not carry the Reese 8551700 connector you're after, however, the Hopkins Endurance Easy-Pull Harness w/ 4-Pole Flat Connector # HM38134 will work just as good, and features an easy pull finger loop to make hooking and unhooking...
    view full answer...
  • Running Lights do Not Work on Trailer
    If the running lights do not work on your trailer it is very likely a bad ground; check your running lights to make sure your grounds are attached to bare metal surfaces and free of any paint, dirt or corrosion. It also could be corrosion on your trailer plug, as corrosion can interfere with the signals getting through the connectors so if it is present you are going to need to replace the plug with # HM38134. I have added a link below to a help article on trailer wiring for you to take...
    view full answer...
  • Adapter for a 4-Way Flat to 6-Way Square Trailer Connector
    The only 4-flat to 6-square connector we carry is part # 30104. This sounds like what you're looking for but I'm not sure exactly if this is the same connector on your trailer. If you can send me a picture I can try to verify that. If this doesn't work you can add a 4-way to the trailer instead of using an adapter. You don't have to cut off the existing 6-way but instead splice into the existing wires and connect a 4-way in addition to the 6-way. Part # HM38134 will work.
    view full answer...
  • Availability of 7-Way Round to 4-Way Flat Adapter for a Light Plant Trailer
    If you have a 4-Way Flat connector on your light plant then the easiest way to connect it to the 7-Way on your tow vehicle would be with the Hopkins Adapter # 47345. We also have the Hopkins Adapter # 30955 which you could permanently install on your tow vehicle by simply disconnecting the US Car Connector from your current 7-Way and plugging it into the back of this adapter. This would give you both a 4-Way Flat and a 7-Way Blade connector so that you don't have to keep track of an adapter. If...
    view full answer...
    Image 1 for
  • How To Install New 4-Way on Trailer with Brown/Green and Brown/Yellow Wires
    It sounds like you have a pretty standard wishbone trailer wiring harness and in which case, the wire colors are as follows: green= right stop/turn yellow= left stop/turn green/brown= right running light yellow/brown= left running light The confusion for you is likely the two brown wires. If you are just installing a standard trailer connector like the Hopkins Endurance Easy-Pull Harness part # HM38134 you would simply attach the green/brown and yellow/brown to the single brown wire at...
    view full answer...
  • Trailer Lights Come on With 2017 Hyundai Santa Fe Off With Curt Wiring Harness
    There are a myriad of reasons why your trailer lights would be on while your 2017 Hyundai Santa Fe's lights are off, and generally the issue is on the trailer side. So the first thing to do is take a look at your trailer's 4-way and check it for corrosion. A build-up of corrosion can cause numerous issues with the lighting signals, so if it is corroded then you will need to replace your trailer 4-way with the Hopkins 4-Pole Flat Connector # HM38134. Also, to ensure there is no corrosion...
    view full answer...
  • Towing a Trailer with European Connector with a 2018 VW Passat
    The Curt wiring harness # C56388 is a standard 4-way connector that's commonly used in the United States. It powers the running, brake, and turn signals on a trailer. In order to connect your trailer with a European connector you'll need to replace the connector with a standard trailer side 4-way like part # HM38134. You'll need to determine which wires on the trailer are for each function and wire them into the new 4-way. On the 4-way the white wire needs to be grounded to a clean...
    view full answer...
    Image 1 for
  • How To Reapair Damaged 4 Prong Trailer Connector on Karavan Trailer
    It sounds like you're referring to the trailer connector on the trailer and in which case it would be pretty easy to replace but there's no repairing it really. For replacement, I recommend upgrading to the Hopkins Endurance Easy-Pull Harness part # HM38134 which is much easier to unplug than the original design. In order to install it just cut the wires from the old connector a few feet back and splice on the new wires color for color using butt connectors like the Heat Shink Butt Connectors...
    view full answer...
  • Connecting Trailer Harness to Trailer Wiring with Different Colors
    It sounds like the new 4-way trailer connector uses standard trailer wire coloring, like part # HM38134: green for right turn and brake, yellow for right turn and brake, brown for running light, and the white wire gets grounded to the trailer frame. That's the easy part. The hard part is finding what the trailer's colors are. Unfortunately, there's no definite way to do this other than getting a 12 volt battery, grounding the ground wire (probably the white) to the battery's negative...
    view full answer...
  • How To Wire 4-Way Connector To Trailer With White, Yellow, Green, Yellow/Brown & Green Brown Wires
    It is very important to always test or trace each wire to determine their functions when changing connectors. This is necessary as you do not always know the manufacturer connected all the wiring correctly. On a 4-Way Pigtail # HM38134 the white is typically your ground with brown being for the running lights, green for the right turn/brake light and yellow for the left turn/brake light. Your trailer wiring is likely very similar with the white most likely being for the ground, green for...
    view full answer...
  • Recommended 4-Way Flat Trailer Connector with Pigtail
    I recommend using one of the Hopkins Easy-Pull 4-Way Flat harnesses. These have a connector with a loop in the middle that makes disconnecting your trailer wiring from your tow vehicle much easier than a standard 4-Way Flat connector. The wiring is also labeled which helps with the installation. This comes in a 12" version as part # HM48114 and a 48" version as part # HM38134. We also have the 12" part # HM48138 which has an integrated LED tester. I recommend using 16 Gauge Butt Connectors...
    view full answer...
    Image 1 for
  • Solution for 4-Way Round Connector on Trailer to 4-Way Flat Connector on 2016 Honda Pilot
    I do have a solution for you but unfortunately there are no adapters for a round 4-Way connector on your trailer to the Curt T-Connector # C56291 on your 2016 Honda Pilot. Instead what you will need to do is swap out the 4-Way round connector on your trailer for a 4-Way flat connector. I recommend cutting the connector off and splicing the Hopkins Endurance Easy-Pull Harness # HM38134 on your trailer wiring so that you get a connector on your trailer that is compatible with your vehicle....
    view full answer...
  • What to Check When There is No Power to the Right Side Blinker and Brake Light?
    The white wires will indeed need to be grounded. This should be done with both lights. If this does not get the lights working properly, you will need to use something like the # PTW2993 to test several things. First, you will need to check the plug on your vehicle to make sure all the ports are working properly. If you have a 7 Way connection, the 3 o'clock position will be the right turn signal and right brake signal. If there is no power, you will need to then check the wire on the...
    view full answer...

< Previous

Do you have a question about this Trailer Wiring?

Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Adam E
Installed by:
Adam E
Employee Jameson C
Expert Research:
Jameson C
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video by:
Chris R
Employee Alexander C
Written by:
Alexander C

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.

Product Experts Available Now!
Call 1-800-940-8924