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  1. Trailer Wiring
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  4. Trailer End Connector
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Pollak 6-Pole, Round Pin, Trailer Wiring Connector - Trailer End

Pollak 6-Pole, Round Pin, Trailer Wiring Connector - Trailer End

Item # PK11604
Our Price: $5.35
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Trailer Wiring
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Establish a secure connection between your trailer and tow vehicle with this 6-pole plug. Round brass pins ensure minimum voltage drop, and pull grips enable easy insertion and removal. Great Prices for the best trailer wiring from Pollak. Pollak 6-Pole, Round Pin, Trailer Wiring Connector - Trailer End part number PK11604 can be ordered online at or call 1-800-496-5010 for expert service.
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  • Reviews (131)
  • Q & A (0)
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Pollak Trailer Wiring - PK11604

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

Establish a secure connection between your trailer and tow vehicle with this 6-pole plug. Round brass pins ensure minimum voltage drop, and pull grips enable easy insertion and removal.


  • Standard, 6-pole plug connects trailer to socket on tow vehicle
  • Round, floating, solid brass terminal pins
    • Minimum voltage drop is ensured
    • Coated with dielectric (non-conducting) grease
      • Prevents corrosion and resistance
    • Easy alignment and maximum contact
    • Solid brass terminal screws
  • Die-cast housing for durability
    • Tapered design with jumbo, finger-pull grips
      • Easy hand-position pull
  • Cable lock with plated steel retainer screw
  • High-impact, ABS thermoplastic interior
    • Includes extended lip for easy removal and replacement
    • Accepts up to #12 gauge wires
    • Has key and keyway to eliminate twisting and breakage
    • Replaceable - minimizes maintenance costs


  • Volt rating: 6 volts - 28 volts
  • Current rating: 40 continuous-duty amps
  • Wiring configuration:
    • Color - circuit:
      • White - Ground Return
      • Brown - Tail Lights
      • Yellow - Left Turn
      • Red - Stop and/or Electric Brakes
      • Green - Right Turn
      • Blue - Auxiliary Circuit
  • 1-Year limited warranty

11-604 Pollak 6-Way, Round Pin, Trailer Wiring Connector - Trailer End
Replaces 30205

Customer Satisfaction Score:

Customer Reviews

Pollak 6-Pole, Round Pin, Trailer Wiring Connector - Trailer End - PK11604

Average Customer Rating:  4.8 out of 5 stars   (131 Customer Reviews)

Establish a secure connection between your trailer and tow vehicle with this 6-pole plug. Round brass pins ensure minimum voltage drop, and pull grips enable easy insertion and removal.


Received quickly. Easy replacement for my motorhome teather. Well made.

No problems. Working as designed.
Dennis - 10/07/2022


Good replacement for the original.


Recieved as ordered


I got exactly what I ordered, two replacement cable plugs for my tow bar from car to tow vehicle. Package included easy to follow instructions for wiring connections. The cable package from the tow bar company is pretty pricey but these plugs and the existing cable to repair cost around $10.00. I will probably order two more to have as spares.

Have no issues since the connector plugs replaced. Very satisfied.
Claude L - 07/24/2018


This works well. I used it for a couple of years and never had a problem.


These connectors were high quality by a known manufacturer. I could have bought them locally but I wouldn't have gotten the expert advice and detailed information that I was able to get from eTrailer!. I talked to several people and each one was very knowledgeable. When the parts arrived, it surprised me because they came so quickly! I would readily order from them again if I needed more trailer parts. I used these connectors to adapt a Minn-Kota trolling motor to my fishing kayak and have attached some pictures showing it installed.


simple replacement. Enough said.

In a commercial envirnment, I expect to replace yearly.
Chamberlain C - 08/01/2021


Works great, what I needed for the connection for my DC fuel pump to my fuel tank I carry in the bed of my truck. I have been a customer for a couple of years now and will continue to be as you always have everything I need then ship it out in a very timely matter.


Decided to make a spare pushbutton controller for my dump trailer so I wanted a good 6-pin connector that matched what I had. This was exactly what I needed. Good quality. Quick delivery. Good price. Had one hiccup with my credit card, and CSR's contacted me asap and got it all straightened out in no time. Would definitely order from etrailer again.


I received the plug/receptacle for my 2002 Chevy van promptly and it was the right fit. The videos provided on the site were very helpful in wiring the plug correctly. All-n-all, a great experience and I would recommend E-Trailer to anyone.


Purchased some new LED lights for trailer. eTrailer has good prices and a good selection. Shipping was a bit slow but that may be be eTrailer's fault, we all know how the postal service works...or doesn't.

No reservations about re-ordering from this company, I like that George followed up with me afterward to make sure I'm satisfied.

Order with confidence!


Was impressed with the websites videos showing how to remove, replace and wire these fittings. When the fitting arrived the procedures were as easy as demonstrated. Did note however that the old fittings showed silicone sealant around the wire connection points and don't recall that being part of the instructions, but seemingly a good idea


I really appreciated the detail provided with each of their products. I was confident of what I was buying and that it would do what I needed to do. I will definitely be buying from them again in the future. Shipping was fair priced and very quick! Thanks a bunch,!! - Ryan


I ordered replacement side markers and was pleased to find the bulbs came sealed to the lense. The ones they replaced had twist in bulbs that would work out of the back of the lense. Better than expected product and prompt shipping. Thanks, Jim D.


This electrical plug is everything that etrailer says it is - great product!


I replaced the connector ends on the cable that hooks from my motor home to my tow vehicle.
The PK11604 are better made product than the original connectors. A machine screw is used to hold the
Receptial in place as compared to the original which had a flush head wood screw. The terminal hold down screws are stronger and easy to work with when installing the wires.


This item and the receiver were exactly what I was searching for. I have a motorcycle trike, with a matching motorcycle tow trailer. That is what these items were ordered for. Very happy with purchase and shipping.


This connector was used to replace a similar no name Chinese knock-off that had corroded badly. Also, I no longer keep the trailer cable connected and left in the elements. Easy to disconnect both ends and store separately.


The Pollak quality is always great! I use this style plug for my trailers. They last longer than the cheap rubber plugs and are easy to maintain.


All parts delivered promptly and packaged securely. I will be mounting the 6-pin plastic wiring socket into the underside of my Honda Goldwing trunk and connecting the 6-pin connector to my Uni-Go single-wheel trailer.


This worked great. It is exactly what I needed to get my TOAD lights working again.
The installation was very easy. As always I got the item very quickly.


Great website and quality products. I was glad to see that the jacketed 6-wire cable I received was made in the USA.


This was an exact replacement for my old 6 pole round connector that had been worn and corroded. Easy fix, great product.


etrailer is my go to place for all my trailering needs. The products are top quality and their customer service is the best. Shipping is very quick. I will be back. Thanks.


Delivered on time with easy to use instructions.
use trailer services when I need any of their products.

Thank you for your service.

Show More Reviews

See what our Experts say about this Pollak Trailer Wiring

  • Wiring Up 6-Way on Trailer that Uses Non-Standard Wiring Colors
    It's not uncommon that the wiring on a trailer uses non standard colors. So what you'll need to do is run a jumper wire from a vehicle battery's positive battery post to the wires of the trailer wiring and see which circuits activate and wire by function to the new connector.
    view full answer...
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  • Trailer 7-Way Wiring For Hart Horse Trailer That Pulled From Plug
    I have included a picture for the trailer 7-way connection and the typical wire colors used and their location. As the wire colors are not standard for every trailer you will want to confirm what each wire does. The easiest way is to use a 12 volt battery to isolate what each wire does on the trailer. If you do not have the capability to do this you can also use trial and error. The wires are most likely as follows. Red- Left Turn/Brake Light Brown- Right Turn/Brake Light Yellow- Reverse...
    view full answer...
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  • Do Trailer Wiring Plugs Have Fuses Built into Them
    Our trailer wiring plugs like the Pollak 6-way part # PK11604 do not have any fuses built into them. This is true for all of the connectors we offer.
    view full answer...
  • Solution to Go From Coiled 4-Way to 6-Way Round for Tow Bar Wiring
    While there isn't an adapter for the wiring situation you are in you can easily cut off the 4-way round of your coiled adapter and install a 6-way plug in it's place with part # PK11604.
    view full answer...
  • Installation of 6-Way Connector to Trailer Showing Only 5 Wires
    If this trailer had a 6-way connector on it before it seems to be missing one of the wires. You mention only 5 wire colors. With only 5 wires on your trailer you will want to test the functions to determine what each wire does and what is the missing wire. The colors and functions don't always match up the same as described Typically, the wire colors on a 6-way trailer connector are: Brown--tail/running lights Green--right turn and brake Yellow--left turn and brake White--ground Red or...
    view full answer...
  • Which Pin of 6-Way Round Carries 12 Volt Accessory Circuit
    Yes, on a standard 6-way plug the center pin is the 12 volt accessory circuit. I attached a picture of a 6-way wiring diagram for you to check out as well.
    view full answer...
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  • How to Wire a Replacement 6-Way Trailer Connector Onto Old Cattle Trailer
    Typically, the connector wires as follows: Brown wire: tail lights Green wire: right turn and brake Yellow wire: left turn and brake Red wire: brake output voltage Black wire: auxiliary If this does not match up with the way your trailer is wired, you will have to wire it by function, not wire color. The best way to do this would be to use a car battery and apply power to each circuit on the trailer wiring harness. Ground the negative battery terminal to the trailer frame, and apply...
    view full answer...
  • 6-Way Trailer Wiring Recommendation
    Based on the colors you gave me I believe the red wire you have has the best chance for being the electric brake circuit. If you check out the picture I attached you can see the typical wiring of 6-way. Wire color is not always an accurate indicator of function though, so you should check to make sure you know which wire does what. To figure out what the wires all are you can trace them all back to see where they terminate, or you could get a vehicle battery and run a jumper wire to each...
    view full answer...
    Image 1 for
  • What Function is Carried on Center Pin of 6-Way Round Trailer Connectors
    A 6-way round-pin trailer plug like Pollak # PK11604 has a center pin that can be wired in two ways. The most common function to be found on that center pin is 12V trailer power. This is a low-level maintenance charge that will maintain a charged trailer battery while you're driving. In other applications this center pin will carry the trailer brake signal from the brake controller mounted in the tow vehicle. Please refer to the linked photo that shows both inside and outside views of...
    view full answer...
    Image 1 for
  • Troubleshooting Trailer Brakes on Horse Trailer with 6-Way that Lock Up
    What you need to do is swap the center pin and the pin in the 2:00 position of your horse trailer's 6-way and the problem will go away. The reason this is happening is that for some reason there are two different ways people wire up 6-ways and the only difference is the brake output and 12 volt accessory circuit pins are swapped. If you cut the two wires and then splice to the other pin it will work just fine.
    view full answer...
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  • Solution for Trailer Connector that Has No Ground Wire
    Sounds like your trailer wiring does not have a ground circuit for it's connector. The easy solution for that is to run a wire from the ground pin of the connector to the trailer's frame. Your trailer electronics should work a little better now as previous to this it was grounding through the ball mount.
    view full answer...
  • How to Wire a 6 Pole Round Trailer End Plug
    There is a suggested and common method for 6 function trailer wiring. You will have the following functions: Right Turn, Left Turn, Ground, Tail/marker, Brake, Battery. I have included a help article on trailer wiring that includes a diagram and wiring matrix that explains wire color, function, and gauge needed, among other helpful information. Also, there are pictures to the right that show how the connector and receptacle wire by color and function. And I have included a link to a video...
    view full answer...
    Image 1 for Image 2 for
  • Which Wire is the Ground Wire on Sundowner Horse Trailer 6-Way
    Between those two color choices the black one would most likely be the ground wire. However, if you hook it up with the black as the ground and it does not work I would recommend trying the red wire. Also, you should trace both of these wires back on the trailer to see where they terminate. The ground wire should be connected to the frame of your trailer. Whichever one connects to the frame is the ground. The ground wire should be wired to the 12 o clock position terminal on the Pollak...
    view full answer...
  • Troubleshooting a 6-Way Trailer Connector Install
    By looking at the picture you sent me it looks like the yellow wire is the left turn, the green is the right turn, the brown is tail lights and the white is the ground. Which leaves us with the two black wires. There are a couple options for determining what the black wires are for. You could get a 12 volt battery like a car battery and run a jumper wire from there to black wires to see what functions on the trailer activate. Or, you could trace the wires back to see where they terminate. One...
    view full answer...
    Image 1 for
  • Ground Wire Location on Trailer For Pollak 6-Pole Connector
    Since different manufacturers can use different color wires you need to test the wires by function and not by color. If there is no white wire present, you can trace the wiring on your trailer to find out where the wires terminate. The wire that is attached to the trailer frame is the ground and should be attached to the 10 o'clock position of the Pollak 6-Pole, Round Pin, Trailer Wiring Connector, part # PK11604. When looking at the connector from the back, the ground would be in the...
    view full answer...
    Image 1 for
  • How to Wire 4 Trailer Wires Into the Pollak 6-Pole Trailer Connector
    Typically, the wire colors are brown for running lights, green for right turn and brake lights, and yellow for left turn and brake lights. White is ground. To confirm this on a trailer you can trace the wires back to see where they terminate or take a separate 12 volt battery and use it to power each wire to see what lights up. To wire up the 6-Way # PK11604 with the 4 wires if looking at the back of the 6-Way where the wires attach running lights will be in the 12 oclock position, ground...
    view full answer...
    Image 1 for
  • Troubleshooting Running Light Malfunctions on a Kaufman Trailers Mini 5 Car Hauler
    If the other lights are working correctly, the most likely cause would be a bad ground. Ground issues may not be apparent until a larger load is placed on the circuit, like when the taillights are activated. It is also common for tilting, folding tongue trailers, and trailer with lots of moving components, like your car hauler to have grounding problems due to the moving components. These moving components, prevent full continuous contact of the metal surfaces, and interrupt the ground...
    view full answer...
  • Can a Vehicle Side Trailer Connector be Mounted so that it is Facing the Ground
    If the vehicle side trailer connector is pointed towards the ground then what can happen is the increased likelihood of debris and moisture getting into the connector leading to corrosion and malfunction of the connector. Also, when a trailer is connected, the ground clearance will be reduced and could result in damage to the trailer side connector or the wiring leading to it.
    view full answer...
  • What are the Functions of the Wires on a Gooseneck Trailer with 7 Wires
    There isn't a standard for trailer wiring color but the likely functions of those wires are red for left turn/brake lights, yellow for reverse lights, brown for right turn and brake lights, green for running lights, black for 12 volt power, blue for output to trailer brakes, and white for ground. On the trailer side you could either trace each wire back to determine the function of each or you could use a separate 12 volt battery and connect each wire, one at a time, to the positive terminal...
    view full answer...
  • Troubleshooting Trailer Blinker that Locks Up Trailer Brakes In Sync with Circuit Flashing
    What is happening is that the left blinker circuit is shorting out on the brake output circuit which is causing the brakes to apply in sync with the blinkers. I imagine the brakes are applying very harshly now too as the brake assemblies are getting a full 12 volts when the brake lights come on. Sounds like you have some wiring issues on the trailer that need to be addressed. Best bet is to go over all of the wiring looking for any cut or exposed wire and fix as necessary.
    view full answer...
  • Horse Trailer Brakes Lock Up When Connected to 1999 Ford F-250
    It sounds like either the trailer side connector is not pinned to match the vehicle side connector or there is a short circuit (possibly due to corrosion on the pin or inside the trailer connectors) causing the brakes on the trailer to lock up. The easiest thing to check first is for dirt/corrosion on the pins and inside each of the trailer connectors. Then you can make sure that the trailer side connector is wired up to work properly with the vehicle side connector. I have included a...
    view full answer...
    Image 1 for
  • Troubleshooting Trailer Brakes that Lock Up When Connected to Trailer Wiring
    This is a fairly common problem for trailer setups that use 6-way connectors like the # PK11604 that you referenced. The issue is that there is two accepted ways the connector can be wired up. The only difference between the two setup is that the brake output circuit and the 12 volt accessory circuits are swapped. It sounds like your vehicle is wired one way and the trailer is wired the other way. What you will need to do is swap the two circuits on either the trailer or the truck. It...
    view full answer...
    Image 1 for
  • Running Lights on Trailer Stay On All the Time
    This sounds like the problem could be a short or possibly ground related but based on what you have said a ground is much less likely. Look for any pinched or frayed wires on the trailer and fix as needed. This could cause a short resulting in constant power draw. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light. Make sure that the vehicle side and trailer side...
    view full answer...
  • Reading 12-Volts on 6-way Connector of Kaufman Tilt Bed Trailer
    Do you mean that you're using a circuit tester on your 6-way connector on the trailer (not the truck) and you're reading 12 volts on one of the pins? The only way that would happen would be if you had a battery mounted on the trailer. Typically, the battery is connected to the 12-volt supply circuit off the 6-way to receive a maintenance charge.
    view full answer...
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