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

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

Item # PK11402
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Establish a secure connection between your trailer and tow vehicle with this metal, 4-pole plug. Round brass pins ensure minimum voltage drop, and pull grips enable easy insertion and removal. Lowest Prices for the best trailer wiring from Pollak. Pollak Heavy-Duty, 4-Pole, Round Pin Trailer Wiring Connector - Metal - Trailer End part number PK11402 can be ordered online at or call 1-800-940-8924 for expert service.
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Pollak Trailer Wiring - PK11402

  • Trailer Connectors
  • Trailer End Connector
  • 4 Round
  • Plug Only
  • Pollak

Establish a secure connection between your trailer and tow vehicle with this metal, 4-pole plug. Round brass pins ensure minimum voltage drop, and pull grips enable easy insertion and removal.


  • Heavy-duty, metal, 4-pole plug connects trailer to socket on tow vehicle
    • Fits Pollack Heavy-Duty, 4-Pole Round Pin Wiring Socket (PK11404)
    • Does not fit Pollak Heavy-Duty, 4-Pole, Round Pin Socket, Concealed Terminals (PK11410)
  • Round, solid brass terminal pins
    • Minimum voltage drop is ensured
    • Dielectric (non-conducting) grease
      • Prevents corrosion and resistance
    • Solid brass terminal screws
  • Zinc, die-cast housing for durability
    • Finger grips make insertion and removal easy
  • Cable lock with plated steel retainer screw
    • Prevents chafing
    • Provides more support for cables
    • Saves installation time
  • High-impact, ABS thermoplastic interior
    • Includes extended lip for easy removal and replacement
    • Accepts up to #12 gauge wires
  • Interchangeable with competitive brands


  • 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

11-402 Pollak Heavy-Duty, 4-Way, Round Pin Trailer Wiring Connector - Metal - Trailer End

Customer Reviews

Pollak Heavy-Duty, 4-Pole, Round Pin Trailer Wiring Connector - Metal - Trailer End - PK11402

Average Customer Rating:  4.8 out of 5 stars   (81 Customer Reviews)

Establish a secure connection between your trailer and tow vehicle with this metal, 4-pole plug. Round brass pins ensure minimum voltage drop, and pull grips enable easy insertion and removal.


Connectors work as expected. Overall experience with is very favorable.


Actually using this to repair an Island Hopper 40lb salt water electric trolling motor. It was through searching (all over the web) the etrailer website that I found it. This is what Island Hopper uses as part of their trolling motor setup.. their wiring from the mother board to the actual trolling motor. Believe it or not. Ha Ha Thanks to etrailer, I can do my own repair now, rather than sending the unit back to the dealer for big buck repair job.
The part....ordered and received.... is excellent. Heavy duty, good finish, easy to use.
On the side, allow me to compliment etrailer. I have made a few purchases from them, and they are always fast, correct and efficient. And can't complain about their prices. Glad you folks are around.


Much better than the 4 pin flat plugs.


I was disappointed when I opened the package. The connections are to be used together. These connections can never be used as 1 unit on a trailer and Vehicle. The pin , and Holes on the female, and male plugs are different.


Great customer service from Caroline! The order came in two days! And earlier than expected. Great pricing and exactly what I ordered.


This Pollak brand works really well...fits nicely into the matching Pollak vehicle receptacle. I aways get matching Pollak connectors for this reason. I found more than one wiring diagram on the etrailer website with different pole assignments. This one was wrong... . I ended up using the configuration that matched the flat round to four round connector... . If I had used the wrong configuration recommended by the experts Q&A articles then my wiring would not have matched the factory converter. So I recommend wiring the Pollak PK11402 to match the Custer ADP001.


Hi All. I was extremely pleased with the price, the quick service and the durability of the plug. I looked all over and the price and delivery terms and rates were way better than the rest. The hook up was easy. The plug is way better quality then the regular 4 Prong I had before. When I test the lights they are all always working. Very happy. Good job. Thx


I like the metal construction with the locking tab. The electrical wireing sockets are brass for corrosion resistance, uses simple screw attachment for the wiring, and handy finger grips for removal from the trailer socket. Four prong plug is all I require.


Worked great to replace the old one.


Nice and sturdy, easy to attach wires.

you use some sort of insulator/tape around wire at hold down clamp.

Fits a little snug first times on and off receptacle.

I am using as adapter to a 4 wire flat trailer connector.


Product was exactly as listed. I'm using it to plug a salt spreader into the truck. Should make plugging it in much easier than the old beat up factory harness. Extremely fast shipping. Etrailer will now be where I get all of my trailer parts.


Nice way to connect basic trailer wiring to a vehicle. Install the matching female socket on the trailer. No dangling wires to get frayed and broken. Etrailer always has the right products and shipping is prompt.


Very happy with the product and always pleased with the service, follow-up and execution of my order from etrailer.


good commercial quality


Used on tractor for auxiliary power to attachments. Has worked great.

Sorry looks like I won’t need a replacement for a long time. This one is holding up just fine.
Mike - 04/29/2018


This is the first time I have changed out a 4-way flat for a 4-way round. Easy to do once I figured out what needed to be done. The on-line instructions were very helpful. Project turned out well. Good product and have had no problems on the road. JD


Great product. Heavy duty. Will only match up with another Pollak connector. Light weight units from Hopkins and others will not connect.


I love the products and pricing but I especially appreciate the patience of the employee with me when I order the wrong part not once but twice and we all laugh about it and then graciously helped me with the right one.


Easy to locate within the web site and easy to order, Price is good. As always, shipping charges can be irksome - but the shipment tracking and followup provided - all help off-set the charge. I appreciate being able to purchase name brand items at reasonable prices.


Fits HD Pollak Connector where other brands do not.


Works great. I'm using it on my tractor to run a sprayer with an electric pump.


Worked exactly as needed and as reported in the product review. Perfect upgrade for the job at hand. Thanks


Great service. Just got home and haven't had a chance to put it on my trailer yet.


Good price and fast shipping, good place to buy trailer related items


Received in timely manner. `Items did not fit--my fault-- but was assisted pleasantly in arranging for correct material. Excellent support from your technician. Thanks. BB

Show More Reviews

Ask the Experts about this Pollak Trailer Wiring

  • How to Take Apart Hopkins 4-Way Round Connector for Securing Wires
    We do not have the particular Hopkins connector you referenced available (which looks to be similar to # PK11402), but I was able to find the installation instructions for opening the connector so you can connect your wires. After removing the set screw, you should be able to simply remove the actual socket from the main housing. With the socket removed, you will then just need to route the wiring through the housing, and then secure them ot the socket terminals. After securing the...
    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...
  • Correct wiring for the Pollock part # PK11402
    The typical wiring for a 4-Way round electrical connector are: White - Ground Return Green - Right Turn and Brake Light Yellow/Red - Left Turn and Brake Light Brown - Tail Light There are two ways for you to determine the functionality for each of your wires: You can either trace each wire to determine which lamp it feeds, or, you can use a 12 volt automotive battery and apply power to each circuit to determine its function. Ground the negative post to the battery to the trailer frame...
    view full answer...
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  • Best Way to Connect a 4-Way Round Trailer End to 4-Way Flat Vehicle End
    The easiest way to get your 4-Way flat vehicle end to connect to your trailer with a 4-Way round is to remove the 4-way round from your trailer and connect the wires to a Draw-Tite 4-Pole Trailer End Connector, part # 18004. This will give you a 4-Way flat on your trailer. In general, on a trailer, the white wire is the ground wire, the yellow wire transmits the left turn/brake signal, the green wire transmits the right turn/brake signal, and the brown wire is the running lights. I am...
    view full answer...
  • Availability of 4-Round Trailer and Vehicle Connectors that Will Accept 12 Gauge Wire
    A 3-flat is indeed a tough plug to find. It might be best to change to a 4-Way of some type. We have the Pollak Heavy-Duty, 4-Pole, Round Pin Trailer Wiring Connector, # PK11402, that will accept up to 12 gauge wire. This is a trailer end plug. The vehicle side is the Pollak Heavy-Duty, 4-Pole, Round Pin Trailer Wiring Socket, # PK11404. It, too, will accept 12 gauge wire. I have included an FAQ article on trailer wiring below.
    view full answer...
  • How to Wire a Mini Truck to be Flat Towed by a 1990 Holiday Rambler Motorhome
    Wiring your Subaru Sambar to be flat towed by your 1990 Holiday Rambler motor home will require the installation of diodes inline with the Sambar taillight wiring. You will need to start with a diode kit like the Tail Light Isolating Diode System with Wiring Harness, item # 38955. We have detailed instructions for wiring a towed vehicle, see link, and I have attached a diagram, see link at right, that shows how to wire the towed vehicle. We also have a video installation for you to review,...
    view full answer...
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  • Replacing a 4-Round Connector with a 4-Flat on a Bayonet Trailer Towed by a 1999 Lincoln Navigator
    If your trailer has a 4-Round that looks similar to # PK11402, you can clip off the plug and connect the wires to a 4-Flat that will fit the 4-Way on the 1999 Lincoln Navigator. You can use the Quick Fix(TM) 4 Pole Flat Trailer End, # HMC20031, or directly wire a trailer-side 4-pole connector like # 18004. The shielded pin is the ground and is usually a white wire. The pin next to that is for the tail and running lights and is usually a brown wire. The next pin is for left turn and is...
    view full answer...
  • How to Wire Nissan Tow Car to Winnebago Motorhome with 4 Pin Round Connector
    Wire colors on motor homes and vehicles are not standard and vary, even between models produced in the same model year. Because this is the case you will need to use a circuit tester, item # 40376 if needed, to test the existing wires on your motor home and vehicle to determine the correct wires to splice your tow wiring to by function. Use the circuit tester and have someone in the vehicle activate each function. Once each function is located on the car and motor home label each one and...
    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...
  • 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...
  • Wiring Adapter for Flat Towing to Connect 6-Round to 4-Round
    You will need to make your own adapter because there are no 6-round to 4-round adapters, and we do have the parts you need in order to do that. For the 6-round you will need the Pollak 6-Pole Round Trailer Wiring Connector # PK11604. Then for the 4-round you will need the Pollak 4-Pole Round Pin Trailer Wiring Connector # PK11402. To connect them you will simply need the Jacketed 6-Wire # DW04906-1. The wire is sold by the foot so you can get the exact length you need.
    view full answer...
  • What Gauge are the Internal Wires of the Roadmaster RM-1064-B
    I spoke to Roadmaster and they said all 4 internal wires of the # RM-1064-B are 12 gauge jacketed wire. Depending on what you will be doing with this wire, the following parts may also be good options for add on parts as well. The Pollak Heavy Duty 4 Pole Round Trailer End # PK11402 would attach to the end of the # RM-1064-B very nicely. This would then pair with the Pollak Heavy Duty 4 Pole Round Vehicle End # PK11404. The # RM-1064-B would then attach to a junction box on the trailer,...
    view full answer...
  • Will the Roadmaster FuseMaster Fuse Bypass Fit a 2011 Ford Edge
    Yes, the Roadmaster FuseMaster Fuse Bypass, # RM76511, will work on your 2011 Ford Edge. Using this fuse bypass will not affect the tail lights on your Edge or the tow dolly because they will receive power from the tow vehicle. If your tow dolly does not have tail lights and you plan on using the tail lights on your Edge, then you will also want a tail light wiring kit. Use # HM56001. These wiring kits connect inline with your tail light wiring at the tail light assemblies and provide...
    view full answer...
  • Different 4-Way Connector Styles and Adapters
    There are not two different 4-pin round connectors; there are just two types of 4-pin connectors, 4-flat such as the Hopkins Endurance 4-Way Flat Trailer Connector # HM48110 and 4-round such as the Pollak Heavy-Duty, 4-Pole, Round Pin Trailer Wiring Connector # PK11402. The 4-round is more rare than 4-flat so you are less likely to see it. If you have a 4-round on your vehicle you can use the Trailer Connector Adapter - 4-Way Round to 4-Way Flat # ADP001. I have also added a link to a...
    view full answer...
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  • How to Make a 4-way Round to 6-way Round Adapter
    You are going to need to make an adapter to accomplish what you are trying to do. For that you would need the part # PK11402 for a 6-way and then part # 16-4B-1 for 4-way wiring and then a # PK11604 for a male 6-way or part # PK11609 for a female round 6-way.
    view full answer...
  • Tow Bar Wiring From a 6-Round Connector to a 4-Round Connector
    You're likely not going to find a 6-Round to 4-Round cord for flat towing a vehicle so the next best thing is to build your own. You can use the 6-Round connector # PK11604 and 4-Round connector # PK11402. Then connect the two with # DW04906-1 which is sold by the foot.
    view full answer...
  • 4-Way Round Trailer Connector for 12 Volt Trailer Wiring Circuit
    For a 4-way round plug we have the part # PK11402 and then for a matching socket part # PK11410 which would work great if you wanted to use it for connecting to a 12 volt battery. Since this is an alternative use for this type of connector you really don't have to use any specific wire of either connector and would have freedom to pick which ever. For carrying a higher amperage you could use the 10 gauge wire part # 10-1-1 which we offer by the foot.
    view full answer...
  • What is the Wire Gauge Used in Hopkins Heavy-Duty Trailer Coiled Extension - 4-Pole Round
    The Hopkins Coiled Extensions with the Nite-Blow such as # HM47045 use 16 gauge wires on the inside. Trailer wiring harnesses usually use 16 to 18 gauge wire for lighting functions and heavier wire for components that draw more amperage. On a 4-Way, you should have left and right turn signals/brake lights, running lights, and a ground so 16 gauge wire will work fine. But if it is for something other than lights then you would likely need to make an extension. We have jacketed 4-wire, #...
    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...
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  • How to Make 4-Way Round Harness that is 12 Feet in Length
    We have 4-way bonded wire sold by the foot with part # 16-4B-1 which you could order in a quantity of 12 feet to get the length you are wanting. Then for 4-way plugs we have the male # PK11402 and female # PK11404.
    view full answer...
  • Can I Replace the Four Way Flat Connector on My Roadmaster Magnetic Tow Lights, # RM-2120
    Yes, you can re-wire the Roadmaster Standard Magnetic Tow Lights, part # RM-2120, to a different connector so it will connect to your motorhome. Most likely the 4 wires will be the standard colors and will wire up color to color. These colors are: Green, Right turn Yellow, Left turn White, Ground Brown, Tail/Marker Typically, the connector is wired in this way: The green wire will be on the top left, the yellow wire will be on the top right, the brown will be on the bottom left, and...
    view full answer...
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  • Tow Bar Wiring to Flat Tow a 2002 Chevy Silverado Behind a Dump Truck
    If you replaced the 4-Way flat connector on the Diode kit # RM-154, you would just have to make sure it was wired to match what your dump trucks require. But yes, it will work. You could use 4-Way round trailer end # PK11402. Given the automatic lights on your truck it could cause some back feeding issues. You would either need to use 2 additional diodes # RM-690 for one, on the wires running from the running light circuit from the dump truck to the diodes included with # RM-154, forward...
    view full answer...
  • 4-Pole Round Pin Trailer & Vehicle Connectors to Allow Conversion from 4-Pole Flat Connectors
    We offer trailer connectors, sockets and plugs in many connector formats that you can view in the linked article on trailer wiring. I also linked our main page for all 4-pin round connectors such as vehicle-side female socket # RM-910030-1 and trailer-side male plug # PK11402. We also have a kit with both, part # RM-910030-4 from Roadmaster. You'll want to be sure to wire the new connectors based on each wire's function, not by its wiring insulation color as this is not always consistent.
    view full answer...
  • Is There a 4-Pole Female Wiring Connector Like the 3-Pole Bulldog Winch
    The Bulldog Winch plug you referenced, part # BDW20178A, is specifically for their winches and we don't have a 4 pole version of it. If you're looking for a 4-pole trailer female connector you can use part # PK11402 which doesn't have the wire leads on it but you can add as much of part # DW03240-1 as you need since it's sold by the foot.
    view full answer...

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Info for this part was:

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