bing tracking image
Customer Service My Orders
  1. Custom Fit Vehicle Wiring
  2. Pollak
  3. 4 Round
  4. Trailer Hitch Wiring
  5. Vehicle End Connector
  6. Plug Only
Pollak Heavy-Duty, 4-Pole, Round Pin Trailer Wiring Socket - Metal - Vehicle End
Add to Cart
etrailer Installation
We'll connect you with nearby partnered installers who know this exact setup.
SCHEDULE AN INSTALLATION
go
Pollak

Pollak Heavy-Duty, 4-Pole, Round Pin Trailer Wiring Socket - Metal - Vehicle End

Part Number: PK11404
152 Reviews | 38 Questions
In Stock
$11.17
Retail:$33.65
You Save: 67%
 Custom Fit Vehicle Wiring
Add to cart
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.
By submitting this form, you understand and agree to our Terms of Sale, Website Terms of Use and Privacy Policy.

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

pollak custom fit vehicle wiring 4 round heavy-duty 4-pole pin trailer socket - metal end
pollak custom fit vehicle wiring end connector 4 round pk11404
pollak custom fit vehicle wiring end connector 4 round
pollak custom fit vehicle wiring trailer hitch 4 round heavy-duty 4-pole pin socket - metal end

Show All (4) Product Images

Show Fewer Product Images

In Use/Installed

0 custom fit vehicle wiring pollak trailer hitch end connector on a
0 custom fit vehicle wiring pollak trailer hitch heavy-duty 4-pole round pin socket - metal end
0 custom fit vehicle wiring pollak end connector pk11404
0 custom fit vehicle wiring pollak 4 round pk11404

Show All (4) In Use/Installed

Show Fewer In Use/Installed

Customer Photos

Pollak Heavy-Duty, 4-Pole, Round Pin Trailer Wiring Socket - Metal - Vehicle End customer photo
Pollak Heavy-Duty, 4-Pole, Round Pin Trailer Wiring Socket - Metal - Vehicle End customer photo

Show All (2) Customer Images

Show Fewer Customer Images

Videos

Show All (3) Videos

Show Fewer Videos

etrailer Installation
We'll connect you with nearby partnered installers who know this exact setup.
SCHEDULE AN INSTALLATION
go
Establish a secure connection between your trailer and your towing vehicle with this 4-pole, round pin, wire-insertion style socket. Zinc die-cast socket has concealed terminals to provide easy assembly and durability . 1-800-940-8924 to order Pollak custom fit vehicle wiring part number PK11404 or order online at etrailer.com. Free expert support on all Pollak products. Great prices and Fastest Shipping for Pollak Heavy-Duty, 4-Pole, Round Pin Trailer Wiring Socket - Metal - Vehicle End. Custom Fit Vehicle Wiring reviews from real customers.
  • All Info
  • Reviews (152)
  • Q & A (0)
  • Related Parts
  • Photos

Pollak Custom Fit Vehicle Wiring - PK11404

  • 4 Round
  • Trailer Hitch Wiring
  • Vehicle End Connector
  • Plug Only
  • Pollak

Establish a secure connection between your trailer and your towing vehicle with this 4-pole, round pin, wire-insertion style socket. Zinc die-cast socket has concealed terminals to provide easy assembly and durability .


Features:

  • Heavy-duty, metal, 4-pole socket connects trailer to towing vehicle
  • Round brass pins
    • Minimum voltage drop is ensured
    • Dielectric (non-conducting) grease coating
      • Protects against corrosion and resistance
    • Wire gauges up to #12 gauge wire accepted
  • Concealed terminals for durability
    • Provide easy assembly
  • Spring-loaded lid
    • Keeps dust and moisture out of interior
  • 2-Hole mounting style

Specs:

  • Fits Pollak Heavy-Duty, 4-Pole Round Pin Connector (PK11402)
  • Does not fit Pollak Heavy-Duty, 4-Pole, Round Pin (PK11409)
  • Mounting dimensions: 1-3/8" diameter hole
  • Mounting screw holes: 1/4"
  • Volt rating: 12 volts - 24 volts
  • Current rating: 35 amps
  • Wiring configuration:
    • Color - circuit:
      • White - Ground Return
      • Green - Right Turn and Brake Lights
      • Yellow/Red - Left Turn and Brake Lights
      • Brown - Tail Lights
  • 1-Year limited warranty


11-404 Pollak Heavy-Duty, 4-Way, Round Pin Trailer Wiring Socket, Concealed Terminals - Metal - Vehicle End







Customers Who Purchased This Custom Fit Vehicle Wiring Also Bought...



Customer Satisfaction Score:

Ratings & Reviews

4.7

152 reviews
5 Stars
(126)
4 Stars
(18)
3 Stars
(4)
2 Stars
(3)
1 Star
(1)
Review Sort Icon
by:
The shipping and tracking was terrible. Showed up almost a week later then the last tracking update said was "out for delivery"
by:
This is not the PK11404 Heavy duty socket. This is the 11404EP Value pack version. Works just as well but inaccurate description is somewhat misleading in my opinion. I thought it was a good price for the PK11404 heavy duty, but high for the PK11404EP
Kate F. profile picture
Etrailer Expert

Kate F.

1/28/2026

Yes Dean, this is indeed Pollak's part number 11-404, our part number PK11404. We do not currently have Pollak's part number 11-404EP on our site at this time, my apologies if you thought you were getting that part number. Based on my research the “EP” designation indicates additional sealing or weather resistance, which makes it better suited for harsher or more exposed conditions. I am going to try to get the other version added to our site, so I am glad you brought this up.

by:
Worked out great as a replacement for a plastic connector that had failed.
by:
Unless you leave them dangling, they usually require that you crawl under the vehicle to connect them. (...Murphy's Law dictates that this will always be when it's raining or snowing).
This Pollak 4-pole round socket, along with a Tow-Ready harness, and matching trailer connector, provides a neat, factory installed look, that's more convenient, and durable.
My orders from etrailer arrived quickly, and with great seller communication. A+
Customer Large Image
Customer Image
Click to Enlarge
by:
very good service speedy
by:
Excelent Quality! Parts was a perfect fit for the factory location.
Customer Large Image
Customer Image
Click to Enlarge
by:
Ordered this along with the Remote Controller, however, the controller would not slide onto the 4 poles. Tried to squeeze the poles and they split leaving one side on each pole. Ended up grinding each partial pole tip so the remote could slide on it. Don't know how long they will last before I have to order another 4 prong connector. They are working fine for now.
Sierra K. profile picture
Etrailer Expert

Sierra K.

6/22/2022

It sounds like you were able to get this part to work for what you needed it for, however, the remote item # BDW20144B is a replacement for the bulldog winch BDW10012 and it will plug right into the winch.

Helpful Links

Accessories-and-PartsBulldog-WinchBDW20144B.html

by:
Looks great.
by:
I've got that trailer that has had one tough life. Yep, hundreds of gigs, PA and sound equipment rolling in and out, the heat, the cold, the sun, rain, and snow. Chicks, guitar players and drummers, you know, all the things that beat the hell out of a drum! Thank the music Gods for etrailer.com! The place to remedy the ills that trailers need in times of harsh environments, tough crowds, tin-ear'd musicians, and you ain't nothing but Hound Dogs!
by:
Quality is good but buyer beware - you must use a compatible plug, as all round 4 pins are not the same. This particular socket has two different size pins (3/1) so be sure to buy a matching plug or pick a different receptacle.
Laura E. profile picture
Etrailer Expert

Laura E.

1/9/2017

Thanks for your review and your business, Pete. I am glad you brought this up! The PK11404 is used in conjunction with PK11402.

by:
Just completed the installation of this product. I'm happy with the quality and believe it will be better than the chrome one (different brand) that it replaced. As usual, "etrailer" did an excellent job of getting the product to me quickly and provided constant follow-up through delivery. They are the best in my opinion!!!
by:
Poorly manufactured. Fell apart after 3 months. The inside wire connection came loose and pulls out of the body of the socket. Had to rebuild the item and secure inner socket with sheet metal screws. It still works but I expected better quality and longevity.
by:
I like this Pollak brand. Their connectors always seem to work the best. I wish this 4 pole connector came with a rubber boot for the back. I couldn't find one, even at the Pollak website. I ended up taping it up really good with electrical tape.
by:
The round pin socket is good, the only issue is it is very easy to install the hookup wire upside down due to the key is not very pronounced in the socket. The socket needs a deeper master key slot.
Michael profile picture

Michael

2/13/2022

Still working no issue again which it had a better master key slot

by:
Heavy built. Very much wish it had a cable clamp on the backside similar to its male equivalent. As it is all the strain on the wiring/cable is supported by the terminals themselves.
by:
Product is exactly what I ordered. I received an email confirming order was placed into system.... 20 minutes later, I received an email that my order was ready for shipping!!
2 days later, I have my product!!

Awesome communication and Awesome prices.

I will be a returning customer.

Thanks etrailer.com
by:
Needed to complete the connection, does require some drilling of holes for mounting screws, but makes a solid connection. Spring loaded cover also locks the connection together. Is easy to use in all weather conditions, and with metal construction is heavy duty and long lasting
by:
Found this company by accident. Living outside of a large city it can take me most of a day to obtain the parts I need. This works well as I can order my parts and move on to the next project. The parts so far have come fast, as stated and packaged well for the travel to my shop allowing me to get the project done or back into service.
NOTE: Check out the etrailer videos online, They are a great resource for the beginner into the industry or the seasoned professional that wants a refresher.
by:
I've used the Pollak pk11404 on a Jeep for a couple of years. The Wi. winters can be a beast on the standard flat 4 wire plugs. This plug came thru winters like a champ. I've traded cars so this 1 is for the new Chev. Great Job Etrailer
by:
Product is just what I expected. I'm going to use this to plug a salt spreader to the truck. The factory harness is pretty beat up so this will make plugging it in much easier. Extremely fast shipping. Great place for your trailer needs. Anything I need from now on will be from Etrailer.
by:
The product that I needed to repair my trailer connection was not to be found in any of our parts stores. I looked on various webs and ran across etrailers's parts. The parts that I ordered were as advertised, came to me, promptly, and I was really impressed by their packaging. I will buy from them again.
by:
This replaces a failed one that was made of rubber and did not hold up to repeated plugging and unplugging.
Jack profile picture

Jack

5/24/2018

It has worked very well. We sold the RV and now have the BlueOx tow bar and brake system for sale.

by:
Hi George, The adjusting star is too small & needs to be bigger - tools slip off easily - the groove is too shallow. They're wearing good.
by:
Item is as described and good heavy duty quality. S&H was very reasonable and delivery to Hawaii took less than a week.

I highly recommend etrailer.com and will personally shop here again.
by:
Just what I wanted! A HEAVY DUTY 4 pin connector for my tow vehicle. No issues or problems.
25
152
true
Show More Reviews

See what our Experts say about this Pollak Custom Fit Vehicle Wiring

Do you have a question about this Custom Fit Vehicle Wiring?
  • Where Does the Transmitter for the Custer Wireless LED Tow Bar Light Go
    The 4-pin round connector that includes the transmitter for the Custer Wireless LED Tow Bar Light # LIW-LDTL will plug into the 4-pin connector on your motorhome and then transmit the signal to the light bar. If you do not have a 4-pin round connector on your motorhome, you would need to add one. You can do this using the Pollak 4-Pole Round Wiring Socket # PK11404. Once you have the plug, you then need to route 16-gauge wire # 16-4B-1 to those pins into your current wiring. I have attached...
    view full answer...
    Image 1 for
  • Parts Needed To Flat Tow 2023 Ford Bronco Raptor With 2018 Newmar Dutch Star 4369
    Hey Mike, thanks for reaching out. You are on the right track here - you really just need parts for the towed vehicle, and I can provide you with a full parts list. Here is the rest of what you'll need to flat tow your 2023 Ford Bronco Raptor: - etrailer Invisible Base Plate Kit - Removable Arms # e57FV (for standard factory plastic bumper) - Roadmaster Universal Hy-Power Diode Wiring Kit # RM-152 (For incandescent lights. Use part # RO94FR for LED taillights) - Pollak Heavy-Duty, 4-Pole,...
    view full answer...
  • Distance Between Mounting Holes on the Pollak 4-Way Round Connector
    I grabbed a Pollak Heavy-Duty, 4-Pole, Round Pin Trailer Wiring Socket, # PK11404, from our warehouse to measure and found the distance between the mounting holes on center is 1-3/4 inches. If you check out the picture I attached you will see that you would have to come up with a shackle type adapter to allow this connector to be used on your base plate.
    view full answer...
    Image 1 for Image 2 for
  • Trailer Wiring Socket Recommendation for a 4-Pole Round Trailer Connector
    For a 4-pole round trailer connector and socket, I would recommend looking at the Pollack Heavy-Duty 4-Pole Round Trailer Connector, # PK11409, and the Pollack Heavy-Duty 4-Pole Round Trailer Socket, # PK11410. The connector and socket have a chrome-plated finish for corrosion resistance. I have attached a photo showing the typical wiring set up for 4-pole round trailer connectors. This should help when you are wiring the connectors to your trailer and vehicle.
    view full answer...
    Image 1 for
  • 4-Way Flat to 4-Way Round Trailer Plug Wiring
    It may seem odd to clarify, but we sometimes have customers describe things differently than we may. So if you are looking for the connector between a 4-way flat on your vehicle and the 4-way round connector a towed vehicle would plug into you simply would need the Custer Trailer Connector Adapter - 4-Way Round to 4-Way Flat # ADP001. If you needed a longer connector you can use # Adapter 4 Round to 4 Flat # 47465. If you are looking for a long trailer wiring umbilical cord, you would...
    view full answer...
    Image 1 for Image 2 for
  • 4-Way Trailer Connector for Use with Blue Ox Base Plate Kit
    If you just need the round 4-way trailer connector then you can use the Replacement 4-Wire Plug part # PK11404. However, you will still need the bracket part 299-0685 which is number 10 in the attached parts list in order to attach the 4-way to the two posts on the Blue Ox Base Plate Kit part # BX1118. If you do need the part 299-0685 then this would be something you would need to contact Blue OX to replace as we do not offer this part as a replacement at this time.
    view full answer...
    Image 1 for
  • 4-Way Round Trailer Connection Much Smaller Than What I Can Find
    I have never seen a connection like that for a 4-way. Regardless of the pin size the slot is internal to the plug on the connection point instead of external as on current 4-Pole Round Connector # PK11404. I recommend replacing the connection with a standard size round connector # PK11404 or converting to the more common 4-flat # HM48190. The Adapter 4 Round to 4 Flat # will use the standard 4 round size connector.
    view full answer...
    Image 1 for
  • How to Install a 7-way and 4-way # HM40975 on a Vehicle with a 4-Way Round
    We have what you need. It sounds like you have a 4-way round on your trailers like the part # PK11404 already installed on your trailer. So what you will need to do is first cut the 4-way off of your tow vehicles and then wire the wires that previously ran to the 4-way to the Harness part # PK11998. You will want to run the running light circuit to the brown wire, the ground to the white wire, the left turn/stop circuit to the red wire and the right stop/turn to the green wire. The rest...
    view full answer...
  • How to Adapt a 4 Round Trailer Plug to a 2018 Silverado 2500
    If you have a 7 Way connection, the 2 o'clock position will be your 12 volt power, the 3 o'clock position will be the right turn signal and right brake signal, the 5 o'clock position will be your brake controller output, the 7 o'clock position will be your ground, the 9 o'clock position will be the left turn signal and left brake, the 11 o'clock position will be the tail light and running lights, and the center position will be the auxiliary circuit. If you have a 4 Flat connection, the...
    view full answer...
    Image 1 for
  • Round Trailer Plug Connector For Installation on a 2022 Kia Sportage
    With your trailer having a round plug instead of a flat plug you will need either one of a couple parts. If you do not already have a connector on your 2022 Kia Sportage you will need the T-One Vehicle Wiring Harness # 118698. This will give you a 4-way flat which you can change to the 4-Way Round # PK11404 connector. Or you can upgrade to a 7-Way # ETBC7 if you have the larger connector. This kit includes the parts needed to also install a Trailer Brake Controller # RED52VR.
    view full answer...
  • Pin Designation on 4-Way Round Socket Vehicle End
    The Pollak Heavy-Duty, 4-Pole, Round Pin Trailer Wiring Socket - Metal - Vehicle End # PK11404 will have the wires labeled in the following manner: White - Ground Green - Right Turn and Brake Lights Yellow/Red - Left Turn and Brake Lights Brown - Tail Lights I've attached a video to help with this pin out. If you are looking at the 4 pins. The bottom left is ground, the bottom right is running/tail lights, the top left is left turn and brakes and the top right is right turn and brakes....
    view full answer...
    Image 1 for
  • 4-Way Round Adapter Recommendation for the Custer Wireless LED Lights # LIW-LDTL
    In order to create a male-ended plug for the female 4-way round connector on your Custer Wireless LED Tow Bar Light # LIW-LDTL, you need to use the Pollak 4-Pole Round Wiring Socket # PK11404. Once you have the plug, you then need to route 16-gauge wire # 16-4B-1 to those pins into your current wiring. I went ahead and attached a diagram of the typical 4-way round pin setup along with the vehicle-side 4-way flat wiring diagram. I've also attached a helpful article that walks you through...
    view full answer...
    Image 1 for Image 2 for
  • Width Between Mounting Holes and Total Width of Pollak Heavy-Duty, Trailer Wiring Socket, # PK11404
    I spoke with my contact at Pollak. He stated the center to center distance between the mounting holes on the Pollak Heavy-Duty, 4-Pole, Round Pin Trailer Wiring Socket, # PK11404, is 2-7/8 inches. The total width is 3-3/8 inches.
    view full answer...
  • Female Side Of 4-Pin Round
    We have the Pollak Heavy-Duty part # PK11404 which is considered the female plug that traditionally goes on the vehicle side but could be used on the trailer side. The trailer side male end is part # PK11409. Please let me know if this is not what you are talking about and I can help further.
    view full answer...
  • Is Pollak 4-Pole Round Trailer Wiring Socket # PK11404 Compatible with Coiled Extension # HM47045
    Yes, the Pollak Heavy-Duty, 4-Pole, Round Pin Trailer Wiring Socket, # PK11404, and the Hopkins Heavy-Duty Trailer Coiled Extension, # HM47045, are compatible parts. You can see a typical wiring description on the product page for the PK11404, under specs. White would be ground return, green is right turn and brake lights, yellow/red is left turn and brake lights, and brown is taillights. Essentially, there is no standard or agreed upon diagram of which function should go with which pin...
    view full answer...
  • Which 4-Way Round Trailer Side Connector Fits Pollak Heavy-Duty, 4-Pole, Round Pin Socket # PK11404
    The 4-Way rounds have 2 different sizes. The connector that is compatible with # PK11404 is # PK11402. What you can do is either replace the 4-Way flat on the trailer side with this connector or you can replace the 4-Way round on the adapter you have with # PK11402.
    view full answer...
  • How Should 4-Way Round Vehicle End PK11404 Be Wired
    If you are towing a vehicle with a motor home the 4-way round connections inside the vehicle end are usually as follows: Top left: Yellow wire, Left turn and brake function. Bottom left: White wire, ground wire. Top right: Green wire, right turn and brake function. Bottom right: Brown wire, tail light function. There is not an industry standard wiring diagram for the 4-Way Round vehicle end, part # PK11404, so you may need to use a circuit tester, part # PTW2993 if needed, to check...
    view full answer...
  • What Style 4-Way Round Socket Does the Custer Trailer Connector Adapter # ADP001 Fit
    The Custer Trailer Connector Adapter # ADP001 that you referenced is designed to fit 4-way round receptacles like the Pollak Heavy-Duty, 4-Pole, Round Pin Trailer Wiring Socket # PK11404.
    view full answer...
  • Testing 4-Pole Vehicle Socket to Confirm Wiring Configuration
    On the Pollak Heavy-Duty 4-Pole Round Pin Trailer Wiring Connector # PK11402 the ground pole (shown in the linked photo) is at lower-left. It is certainly possible that your vehicle socket, one like # PK11404, was wired with ground on a different pin. You will need to test the vehicle wiring to confirm so that you can wire connector # PK11402 to match. This is easy to do; all you need is some wire like # 10-1-1 to connect the battery to the contacts on the vehicle's socket. This will show...
    view full answer...
  • Need to Adapt 6-Way Connector on Motor Home to 4-Pole Round Tow Bar Cable
    I would recommend installing a 4-pole round socket, part # PK11404 on the rear of the motor home, rather than trying to construct an adapter. The socket would need to be tapped into the wires feeding your 6-way. We offer 4 conductor wire, part # 16-4B-1 that is sold by the foot, you would probably want at least two feet. The wire is conveniently color coded, and would attach to the 4-pole socket as follows: Attach the brown wire to the # 2 terminal. Terminal # 1 would be grounded to the...
    view full answer...
  • How to Wire Up a Tow Vehicle that has a Separate 6-Way to Tow a Vehicle with a 4-Way Flat
    The easiest way to do what you need is to convert the signal on your RV's connector to a combined circuit and then install a 4-way on your RV like part # PK11404 in place of the 6-way. For that you would want to start with a signal converter like part # RM-732. You will need to wire up the RV trailer wiring just like the label of the converter recommends. You'll notice that the running lights aren't mentioned on the label, that's because it bypasses the converter and runs straight to the...
    view full answer...
    Image 1 for
  • Is the 4-way flat to 4-way Round # 47465 Compatible with with 4-Pole # PK11404 and # PK11410
    I went and pulled the Adapter part # 47465, Pollak Heavy-Duty, 4-Pole, Round Pin Trailer Wiring Socket # PK11404 and Pollak Heavy-Duty, 4-Pole, Round Pin Socket # PK11410 to see if they were all compatible and I found that they were. The round 4-way of the # 47465 is compatible with both the # PK11404 and the # PK11410. Check out the video I attached where I show this.
    view full answer...
  • No Drill Mounting Bracket for Installation of a 6-Way Connector # PK11404 on a 2009 Toyota Tacoma
    Yes, we have a bracket for mounting the Pollak Heavy-Duty, 4-Pole, Round Pin Trailer Connector, item # PK11404. The Pollak Connector Bracket for 4-, 5- and 6-Pole Trailer Connector Sockets, item # PK11627, is designed to be attached in several ways. If you like, you can attach this bracket by drilling two holes and screwing the bracket to any location you like. If you do not want to drill, there are two other mounting methods. One is to use the Plate that sticks out to the side of the...
    view full answer...
  • What is the Center Bracket for In Roadmaster Base Plate Kit # 1425-1, 2004 Jeep Grand Cherokee
    You are correct. The center bracket with the round hole in Roadmaster XL Base Plate Kit, # 1425-1, is for the wiring harness to mount to. A connector like # RM-910030-1 can be mounted in that bracket, or Pollack connector, # PK11404.
    view full answer...


< Previous
12
Next >



Do you have a question about this Custom Fit Vehicle Wiring?


Info for this part was:

Employee Sarah L
Expert Research:
Sarah L
Employee Robert G
Expert Research:
Robert G
Employee Patrick B
Expert Research:
Patrick B
Employee Michael H
Expert Research:
Michael H
Employee Tyler C
Written by:
Tyler C
Employee Joshua S
Video by:
Joshua S
Employee Dustin K
Video Edited:
Dustin K
Employee Zach D
Video Edited:
Zach D
Employee Cole B
Installed by:
Cole B

At etrailer 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.