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Hopkins Endurance Easy-Pull 4-Pole Flat Extension - Vehicle and Trailer Ends - LED Tester - 12"

Hopkins Endurance Easy-Pull 4-Pole Flat Extension - Vehicle and Trailer Ends - LED Tester - 12"

Item # HM48148
Our Price: $13.01
You Save: 52%
Trailer Wiring
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Shipping Weight: 0.22 lbs
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Increase the length of your 4-way flat connection by 12" with this extension loop. Large grip ring on trailer end provides maximum leverage when disconnecting. Built-in LED lights illuminate to verify power. Great Prices for the best trailer wiring from Hopkins. Hopkins Endurance Easy-Pull 4-Pole Flat Extension - Vehicle and Trailer Ends - LED Tester - 12" part number HM48148 can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (35)
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Hopkins Trailer Wiring - HM48148

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

Increase the length of your 4-way flat connection by 12" with this extension loop. Large grip ring on trailer end provides maximum leverage when disconnecting. Built-in LED lights illuminate to verify power.


  • 4-Way flat extension loop increases the length of your wiring connection by 12"
    • Plugs into the 4-way flat connectors on your vehicle and trailer
  • Easy-to-pull ring on trailer end 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
  • Built-in, red LED lights on trailer end offer easy troubleshooting
    • Lights illuminate to verify that the connection is working
    • Labeled for each function on your vehicle
  • Corrosion-resistant terminals are long-lasting
  • Comes with 1 dust cap and a terminal grease packet for electrical connections


  • Ring inner diameter: 1"
  • Ring outer diameter: 1-7/8"
  • Wiring harness length: 12"
  • 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 extension loop, 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 on this harness with the vehicle-end plug, and you'll get 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.

Built-In LED Lights Illuminate to Verify Connection is Receiving Power

Reduce the frustration associated with troubleshooting trailer wiring problems with the lighted 4-way connector on this extension. It has built-in LED lights that help you determine quickly and easily if your trailer connection is receiving power. Just plug the extension loop connectors into the 4-way flat connectors on your vehicle and trailer. No need for separate testing tools. Then activate each function on your vehicle and a red light will come on if power for that function is being received by the connector. If there is power going into the connector for all of the functions, but your trailer's lights are still not functioning, then you know that the problem is on the trailer end and you will need to check your trailer's wiring. Each function except for ground is represented by a separate light and the functions are labeled for easy identification.

48148 Hopkins Easy Pull 4-Pole Flat Extension Loop with LED Test Lights - 1' Long

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Hopkins Endurance Easy-Pull 4-Pole Flat Extension - Vehicle and Trailer Ends - LED Tester - 12" - HM48148

Average Customer Rating:  4.7 out of 5 stars   (35 Customer Reviews)

Increase the length of your 4-way flat connection by 12" with this extension loop. Large grip ring on trailer end provides maximum leverage when disconnecting. Built-in LED lights illuminate to verify power.


I've had this item for a year and it still works perfectly. The ring makes plugging and unplugging easier and the included cover protects the terminals when not in use. The length is enough to keep it hooked up, even to the point of jack-knifing the trailer with a drop hitch. While I didn't actually jack-knife my trailer, I came close and it was still hooked up. Price was right and delivery was fast.

Still work great, My original assessment is still true in all respects.
Richard G - 06/20/2020


Great extender and tester in one cable.


A good product at a fair price. The rings make it much easier to plug in and unplug the wires/harness. When it is difficult to plug in and unplug the wires there is a greater probability that something is going to get damaged. If you have had that problem you know what I mean.


I purchased a 12inch 4-flat trailer connector. It is exactly what I had hoped for. It was at a great price and easy to order. I have ordered parts from them before as well. It arrived very quickly. I would absolutely recommend buying there products.


Needed a short extension of my electrical harness from Boat to Truck. This Easy pull 4 pole extension was perfect. The LED continuity tester is a great feature ..!! Happy with this purchase ..!!


Works as advertised. I keep it in my truck and use it on whichever trailer (utility, jetski, etc) I'm towing at the time. Ring makes it easy to disengage from truck socket.


Needed some extra length on my utility trailer wiring due to a longer hitch and this fit the bill perfectly.


great invention, so simple and easy to use , my old hands always had a hard time and with cold weather the plug can be a pain, not any more . easy install and very cost effective


Service is great. Second time I have used e-trailer for their product.


It works great - the one foot length was perfect.


Its been a year still very useful!
Frank - 03/03/2022


A little slow on the shipping


good product.


Great product!!!


Good product, price OK, receaved has attended...very happy thankyou!


All three of the items on my order appear to be very good for there purpose.


Very well made. Works as advertised. Very quick delivery and excellent pricing.



works great.


As advertised.


customer service was exceptional!






Show More Reviews

See what our Experts say about this Hopkins Trailer Wiring

  • Troubleshooting Trailer Lights that Dont Work but Tester Works Fine
    It sounds like you're referring to a 4-way trailer connector that has test lights on it like the Hopkins # HM48148 does. And the test lights are working fine but the trailer lights aren't working. There's a few reasons this could be happening. Since the test lights are on you definitely have power coming from the vehicle connector; however, maybe not enough. The test lights are probably LED which require a lot less power than incandescent lights do. You may not have enough power to...
    view full answer...
  • Recommended Circuit Tester That Pulls At Least 5 Watts
    I reached out to Hopkins and since the Hopkins Endurance Easy-Pull 4-Pole Flat Extension - Vehicle and Trailer Ends - LED Tester - 12" # HM48148 LED lights it will not have the 5-watt draw needed to activate the trailer light circuit in your 2013 Volkswagen Tiguan. Instead I recommend the # 40376 which my contact at Tow-Ready confirmed will pull more than 5 watts, and will be just what you are needing to test your 4-way connector. I included a video of the # 40376 for you to take a look at.
    view full answer...
  • 4-Pole Wiring Extension for Connecting Reese RAM Lighted Hitch Cover RP86531 on 2015 Ram
    If you want to install the Reese RAM Lighted hitch cover # RP86531 and its 16-inch-long 4-pole wiring harness is not quite long enough to reach your truck wiring you can simply use an extension. We have 4-pole extensions in many lengths, such as the 12-inch # HM48148, 24-inch # HM47004 and 48-inch # HM47114. We also have a 10-foot extension # HM48235 but this one does not have the special Hopkins Easy-Pull connectors found on the other extensions listed.
    view full answer...
  • Is There a Hopkins Easy-Pull 4-Pole Extension Available That is 8 Feet Long?
    The longest Hopkins Endurance Easy-Pull Harness 4-Pole Flat Extension offered will be the # HM47114. This will be 48 inches long and all the Easy-Pull Harnesses will come with 18 gauge wires for the brown (taillight), green (right turn and brake), and yellow (left turn and brake) wires and then the white (ground) is a 16 gauge wire. This will typically be the standard used with most manufacturers. If you wanted something more heavy duty, you will need assemble one. The Deka Wire - Jacketed...
    view full answer...
  • How to Power Skull Trailer Hitch Receiver Cover on a 2018 Ford F-150 Raptor
    The skull trailer hitch cover, part # CR-018, plugs into a standard 4-way trailer connector at the back of your 2018 Ford F-150 Raptor. If you don't have a trailer connector you can add one using part # HM11140735. It does not include a hitch pin. Use part # PC3 for a standard pin and clip or, this is what I would do, get a locking pin like part # e98880 to protect it. The wiring harness is 18 inches long. If it isn't long enough to reach your 4-way you can use an extension like part...
    view full answer...
  • Wire Colors and Functions on 4-Pole Trailer Wiring
    In 4-pole trailer wiring like # 16-4B-1 clearance lights (and tail lights) will connect to the brown wire. The 4-pole format's wire color/function arrangement is as follows: WHITE wire is ground YELLOW wire is LEFT stop and turn GREEN wire is RIGHT stop and turn BROWN wire is running/clearance lights If you like you can refer to the linked article on wiring for more details. These wire color and function assignments are always the same in 4-pole wiring, including items like # A35W42B...
    view full answer...
  • Trailer Wiring Using Wishbone or Y-Harness 4-Way Trailer Connector
    The 20 Ft 4-Way Trailer Wiring Harness - Wishbone Style - 30" Ground # A20WB simply has two wires that connect to the running light pin of the 4-way. There isn't a 5 wire we carry in spools or by the foot, but we do carry the Bonded 4 Wire - per foot # 16-4B-1 and then you can add Primary Wire - 16-Gauge - White - per Foot # DW02359-1 for the additional running light wire. You can connect these to a 4-way flat connector using the Hopkins Endurance Quick-Fix Replacement 4-Way Flat Trailer...
    view full answer...
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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Dustin K
Video Edited:
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Employee Cole B
Installed by:
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Employee Shane H
Installed by:
Shane H
Employee Alexander C
Written by:
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