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48" Long 4-Pole Loop with Cover

48" Long 4-Pole Loop with Cover

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Lowest Prices for the best trailer wiring from Hopkins. 48" Long 4-Pole Loop with Cover part number HM47115 can be ordered online at or call 1-833-496-1390 for expert service.
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Hopkins Trailer Wiring

  • Wiring Adapters
  • Single-Function Adapter
  • 4 Flat
  • Plug and Lead
  • 0 - 5 Feet Long
  • 4 Flat
  • Hopkins

4-Way Flat Wiring Harness Extension

  • Extends your current 4-way connector 48"
  • Includes cover and grease

47115 48" Long 4-Pole Loop with Cover

Item # HM47115

California residents: click here

Video of 48" Long 4-Pole Loop with Cover

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Hopkins Wiring - Wiring Adapters - HM47115 Review

Today we're going to review part number HM47115. This is the Hopkins 48 inch long 4-Way Flat Extension. This part will extend your wiring system for more flexibility. Does have the corrosion resistant terminals. It is 48 inches in length, includes the dust cover, the package of dielectric grease, and some zip ties. Basically when you go into install this you would just plug this end into your existing 4-Way and it would extend it out, this wire would extend it out another 48 inches, and then you just plug this into your trailer or whatever you're going to hook up to.

The dust cover just snaps right on, it's a rubber cap. Just snap it on, it'll stay in place when you're not using it. Just put the dust cover over the terminals and just like that and you're ready to go. That should do it for the review on part number HM47115, the Hopkins 48 inch long 4-Way Flat Extension. .

Customer Reviews

48" Long 4-Pole Loop with Cover - HM47115

Average Customer Rating:  4.9 out of 5 stars   (74 Customer Reviews)


I have now installed the following on my 2017 Wrangler:
Brake light relay kit .
Hopkins Towed vehicle Tail Light wiring kit.
Blue Ox base plate.
Blue Ox Patriot Portable RF Braking System.
All of this has taken about 3 days of work spread out over a week or so. Overall it went well. Not too many surprises. Crawling around under a car at 71 is a bit of a strain but I'll get over it. I must say that Donna P. has been a wonderful source of great information and has stayed right on top of the process. eTrailer has been a great source for this project.

I would recommend you all with no hesitation.

I am still in love with the products. My only issue is having enough time to use them more.
John M - 06/15/2018


I love the new setup for my truck. I changed the receiver to a Draw-Tite Ultra Frame model and mounted the connection on the receiver. It works great and accommodates both of my trailers with the 7 pin and 4 pin connections. Couldn't be more pleased. My rewiring of my light trailer is flawless, solid connections and good quality. Thanks!


Great service and selection, shipped fast and arrived ok. Parts work very well, and so far so good. Still working on a more secure and adjustable mounting solution so the light can be seen when the rack is up or down.


It was only one item in the order and they nailed it. That means something on the the shortage of help is. It came in a timely fashion as described by my order taking person (notice no gender pronouns just trying to be hip). I’ve used them in the past with fantastic results and I wouldn’t hesitate to use them again. There a sold company


It works just fine.


Lights have worked exceptionally. I didn't experience the wiring difficulties expressed by others, and I have the larger cargo carrier. My only complaints are that the wiring plug to the light fixture is exposed to the cargo and can be damaged, and the fixture itself can be pushed out by cargo. I made a protective cover mount to correct these problems. I would note that the above complaints can be applied to all the light fixtures I reviewed across the internet.


Works perfectly, just as described.

used mine when I was installing of the ModuLite Circuit Protected Vehicle Wiring Harness Item # 119190, so I didn't have to back up to the camper when checking function before I finished the install. Now it will be extra parts if I need it.


*Although I have not installed the trailer jack yet it looks like a direct replacement for the original one on my boat trailer. The wheel that goes with the jack definitely looks like a better fit than original.
*The electrical 4 conductor plug set... I'm using for a quick disconnect for a third
( center ) brake light for tailgaters


Using this for a hitch extension. The 4 wires are fused flat. Had to use 1/2 loom instead of 3/8. I understood the 3/8 would work when I ordered. Had the description shown the wires were fused flat i would give 5 stars.


Excellent quality. Good product. Using it to extend from my boat trailer wiring connection to my truck. Needed because I have a camper on the truck and also needed to have extended slide-in hitch extension.


Excellent idea.Makes wiring from plug to lights much easier and more reliable. If plug gets damaged, now I only need to replace harness back to the junction box. I plan to install another box in the rear of the trailer to eliminate Scoth lock connecters that are susceptible to corrosion. Only suggestion, could have made the box smaller to fit inside the trailer channel. No need for it to be this big.


The 12" Ball Extension Bar works Great! It allows me to make 90 Degree Angle Turns without hitting my trucks bumper. Of course I need to extend the electrical light connection (HM47115), just had to trim the soft plastic to fit perfectly into my trucks connection.


Along with 7-pin to 4-pin adapter this added the length I needed for my cargo tray I had purchased from etrailer years ago.


Product was exactly what I was looking for. No one local carried it. Quality was excellent as was the service.
Great job from a great company.
Merry Christmas to all at etrailer.

Still working great!
Bob M - 12/05/2017


The cargo tray is exactly as I expected. It meets and exceeds expectation. The LED light kit however is a big disappointment. The connector significantly protrudes into the cargo tray. Because of its design it is very susceptible to any load pushing it out of its socket onto the road. It would have been perfect if it had a pigtail connector instead. And the wire harness is to short! In the future suggest an extension. Oh well. When the inevitable happens I will make my own.


Excellent quality. They thoughtfully included dielectric grease and a protective cap to help prevent corrosion so you don't have bad connections and dead lights.


The product was exactly what I expected, and it arrived in a timely fashion. I consider etrailer my go-to vender for anything to do with towing, because tricky installations (not the case in this purchase) are explained in videos, etc.


I bought this item because I have one trailer and three different vehicles set up for hauling it. Each of the vehicles have different length pigtails, which pose a problem. This was an inexpensive solution! Much easier than extending the wires on two vehicles or the trailer. It's well-made, good price and shipped quickly. Thanks


Found exactly what I was looking for at etrailer. I purchased an 18" hitch extender to aid in launching my skiff. I paid for 3 days shipping and it arrived in 3 days along with the accessories I ordered. All products very well made and did the job.


Item arrived and was as described. I felt what was really worth mentioning was the customer service. I had problems ordering on my smart phone due to coverage, so I had to call. I spoke with two customer service representatives and they were both fantastic. It's refreshing to see there is still a company that obviously cares about service.


nice to have the flexibility of a few extra feet of wiring harness.


I had a Question about a connection and Melinda did a fantastic job of searching and finding the fitting I needed. Prices are always lower than any I've found on line. Will definitely buy from them again. Thanks.


Works great as an added extension for when the other cable is shorter than you like it to be.

I have used this numerous times and works well.
Chris B - 12/19/2017


Lightening fast shipping. Everything you need to know is in the videos. I received package super fast and wired entire vehicle in a few hours. 2017 Chevy Express van with no factory wiring. I did the entire thing. It's dark out side so I can't take pics.


EXACTLY what I could not find locally in five different stores. Rewiring the front of my boat trailer was a breeze!
Thanks guys!

Show More Reviews

See what our Experts say about this Hopkins Trailer Wiring

  • How to Make 4-Way Male to 4-Way Female Adapter
    An easy solution would be the part # HM47115. This is a 4-way male to 4-way female style connector which comes with 48 inches of wiring but you could easily cut that down to a shorter amount as needed.
    view full answer...
  • Could Hopkins 4-Way Extension # HM47115 be Used When Flat Towing Vehicle
    Yes, if you were looking for a 4-way extension to go from your tow vehicle to your Jeep that is being flat towed with a tow bar and both connections are 4-way connectors the # HM47115 could be used as a way to make that connection. This provides 4 feet of extension which would normally be enough for this application.
    view full answer...
  • Availability of 4-Way Extension Harness for 2014 Toyota 4Runner
    The part # HM47115 is a 48 inch (4 foot) long 4-way extension harness. Since you said the connector on your 2014 Toyota 4Runner was factory that leads me to believe you actually have a 4-way and not a 5-way. The LED light situation shouldn't be an issue either. The taillights of your trailer should already have a converter installed on them to separate out the combined signal of a 4-way. If not email me back with what setup you do have and I will do my best to help you.
    view full answer...
  • 4-Way Trailer Wiring Extension Recommendation for 2014 Toyota 4Runner
    If your 2014 Toyota 4Runner already has trailer wiring installed the circuits have already been converted to be combined to match what your trailer will require. The part # HM47115 is a 48 inch (4 foot) long 4-way extension harness. You aren't the first person with a 2014 Toyota 4Runner to be looking for an extension harness either, but this did work well for the previous customer.
    view full answer...
  • Installation of Hopkins Towed Vehicles Wiring Kit on a 2017 Jeep Cherokee Overland
    The Hopkins Wiring Kit for Towed Vehicles # HM56208 is confirmed to fit all models of the 2017 Jeep Cherokee so it will work great on your Overland. The harness plugs in behind the tail lights, like you said. You'll need to remove both tail lights by removing the clips. You'll need to open the tail gate to access this. Then the tail light assemblies will disconnect from the Jeep. Behind them are the plugs for each light which have connectors that will mate with the Hopkins harness. If...
    view full answer...
  • Is An Extension Harness Available For The Hopkins Plug-N-Tow Wiring Connector # 42535
    I do have the Hopkins 48 Inch Long 4-Pole Loop with Cover # HM47115 which is a 4 foot extension that you can use to add length to your 4-way connector.
    view full answer...
  • Availability of Extension for Curt # 56042 4-Pole Trailer Connector on 2009 Toyota Highlander
    Hopkins offers a 48 inch long loop, part # HM47115 that would work for you. You'd simply install the # 56042, then plug the loop into the 4-pole which will provide a four foot extension. The loop includes some dielectric grease you can add to the connection to exclude moisture. I'd recommend wrapping the connection securely with electrical tape as well. If you click the provided link, you can see other accessories available for your Highlander.
    view full answer...
  • How to Run Hopkins 4-Pole Extension # HM47115 to Exterior of Vehicle and Hitch Mounting Bracket
    Usually within the rear cargo area of a vehicle there will be access holes, sometimes filled with a rubber grommet, through which you can route wiring. Since the size of the 4-pole plug # HM47115 may be too large for some of these holes it may be necessary to widen the opening. Take a look under the rear cargo area carpet and trim panels for any such available openings. If you find that you need to enlarge (or create) a hole for the 4-pole be sure to check behind that area to ensure no...
    view full answer...
  • Wiring for 2018 Ford Edge Sport to be Flat Towed and to Tow a Trailer
    It's actually easier than you might think. I recommend using the Tekonsha wiring harness, part # 118677, for towing the trailer with your 2018 Ford Edge Sport because it has a higher maximum amperage than the other options. It plugs in behind the tail lights and then you run a hot lead up to the Edge's battery to power the converter box. Then for the toad wiring use the Hopkins # HM56011 which also plugs in behind the tail lights. Both harnesses use the same connectors and can be plugged...
    view full answer...
  • 7-Way Commercial Truck Plug to 4-Way Wiring
    For a Commercial Truck 7-pin, you will want the 7-Way Round Pin to 4-Flat Adapter # 118709. Then if you need extra length you can use the 48" Long 4-Pole Loop with Cover # HM47115.
    view full answer...
    Image 1 for
  • Can I Connect the T-One Vehicle Wiring Harness to the Cigarette Lighter on my 2016 Mazda CX-5
    The T-One Wiring Harness # 118563 will fit your 2016 Mazda CX-5 but needs to connect to the battery. This wiring harness has a powered converter so it requires a direct connection to the vehicle battery to power the trailer lights. Connecting the harness to the battery protects the vehicle wiring and electrical components from damage. Tapping into a 12 volt outlet of your 2016 Mazda CX-5 could over load the circuit and the vehicle's electrical system would be more vulnerable. We have experienced...
    view full answer...
  • Can Spectro 4-Pole 12-Inch Car and Trailer End Loop # 9653P Be Used as a Wiring Harness Extension
    The Spectro 4-Pole 12-Inch Car and Trailer End Loop # 9653P is a perfect solution for cases where trailer wiring is just a bit too short. We also offer a 4-foot # HM47115 from Hopkins.
    view full answer...
  • Troubleshooting Wire Colors that Dont Match Harness Colors For Connections
    I need to know what harness you are looking for to give you the specific wiring functions of your T-harness, but it sounds like it is working to give you 4-way functions. The colors of the wire are not an issue as long as the functions of the wire and the compatibility of the connectors work. Many manufacturers use different colors based on the wire they have available at the time of manufacturing, so they are often not consistent with other harnesses. If you have an extension that is...
    view full answer...
  • Length of Wiring Harness that Comes with Chevy Bowtie LED Lighted Trailer Hitch Cover # RP86530
    The length of the harness that comes with the Chevy Bowtie LED Lighted Trailer Hitch Cover # RP86530 that you referenced is 13-3/4 inches.
    view full answer...
  • Mounting 4-Way Extension on Factory Hitch of 2021 Toyota 4Runner
    Thanks so much for the photos, and there may be an option for your 2021 Toyota 4Runner which will allow you to mount the 48" Long 4-Pole Loop with Cover # HM47115. I can't quite tell if the section the hitch is attached to has an opening above it, but if so, you could mount brackets just to the left of the hitch with the No-Drill Mount # 18140 and Mounting Bracket 4-Pole Flat # 18144. If there is not an opening that allows you to attach the No-Drill Mount, the only option I can see would...
    view full answer...
    Image 1 for
  • Routing a Trailer Wiring 4-Way through the Cargo Area of a Hyundai Santa Fe and Outside the Vehicle
    If you are unable to find a hole or grommet large enough for the 4-Way flat to fit through, you are left with 3 options. First, you can just leave the harness inside the vehicle and pull it out through the rear hatch as described in the instructions. Or, you could also drill out a hole using a 2 inch hole saw. You will need to provide your own grommet or otherwise seal up the hole after you route the trailer wiring through. The third option is to use an extension like # HM47115. You can...
    view full answer...
  • Availability of 4-Pole to 4-Pole Trailer Wiring Extension
    We do offer both 4-foot and 6-foot 4-pole trailer wiring extensions that you can use to extend your trailer connector. For a 4-foot extension use part # HM47115; for a 6-foot extension use part # RM-300150-00.
    view full answer...
  • Longer 4-Way Harness Recommendation to Go Along with TLL9RK Kit
    The part # TLL9RK comes with a 25 foot long section of 4-way wiring. For an additional length of 10 feet of this wire with the correct connections you would want the part # HM48235. This will give you 35 feet of wire. For additional length you would want the part # HM47115 which will give you additional 4 feet.
    view full answer...
  • Can an Lighted LED Hitch Cover be Converted to a Tailgate Emblem on a Dodge Ram
    What you have described regarding your # CR-007D would work but instead of splicing in more wire you could just use a 4-Way extension such as # HM48145 which is 12 inches or # HM47115 which is 48 inches. The longer one would give you more options for routing the wiring. Keep in mind that the hitch cover was not designed for this purpose so any warranty it has will be void.
    view full answer...
  • Recommended Tow Bar Wiring for 2016 Ford F-150
    You are correct that aluminum doesn't work well with magnets. The Heavy Duty Magnetic Tow Lights - 20' Wiring Harness with 4-Way Flat Trailer Connector # TL21RK can only be attached to the cab of your truck if you choose to use them or to a steel bumper. I recommend using the Hopkins Custom Tail Light Wiring Kit for Towed Vehicles # HM56009 instead. This harness connects behind your tail lights to your factory harness and then you simply run the connector on the harness to the front...
    view full answer...
  • Adapting a 7-Way Trailer Connector on an RV to a 4-Way Flat on a Towed Vehicle
    If the coach uses the 7-Way RV style connector with blade style pins then you can use coiled adapter, # HM47065, with the Hopkins Custom Tail Light Wiring Kit, # HM56000, or similar tow bar wiring that has a 4-Way flat end. If the coach has a 7-Way round pin connector then you can use an adapter such as # 118709. But you will likely need a 4-Way extension, # HM47115, to reach from the front of the vehicle to the coach. If your coach has a 6-Way round pin connector then you would use an...
    view full answer...
  • Available Lengths of 4-Pole Trailer Wiring Extensions
    We do offer 4-pole extensions that can be used with the Tow Ready 7-Way to 5-Way/4-Way Trailer Adapter for Vehicles with Lamp-Out Sensors Towing Trailers with LEDs # TR20141. We have 4-pole extensions in many lengths including the 10-foot # HM48235, 4-foot # HM47115 and # HM47114, and 2-foot # HM47004.
    view full answer...
  • Parts Needed to Extend a 4-Way Trailer Connector
    You just need an extension loop like # HM47115 which is 48 inches long. If that is too long then we have a 12 inch extension # 9653P. If you want to make these extensions permanent then I recommend using some dielectric grease between the connections, # 11755, using zip ties to hold the connections together, and then using electrical tape to wrap it all up to protect it from the elements.
    view full answer...
  • Recommended 34 Inch Hitch Extender For Truck with In-Bed Camper and Towing Trailer
    The Hitch Box Extension and Reducer for Titan 2-1/2" Trailer Hitches, 24" - 34" Long # RP45292 or the Curt Hitch Extension and Reducer for 2-1/2" Trailer Hitches - 24" to 34" Long # C45048 will work for your truck and trailer as you described it, but I recommend the Reese because of its higher rating. The measurements are from hitch pin hole center to hitch pin hole center. We measure this way because the hitch receiver can have different dimensions from the hitch pin hole to the end...
    view full answer...

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Info for this part was:

Employee Zack K
Video Edited:
Zack K
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Alexander C
Updated by:
Alexander C

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