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Pollak Heavy-Duty, 7-Pole, Round Pin, Trailer Wiring Connector - Trailer End

Pollak Heavy-Duty, 7-Pole, Round Pin, Trailer Wiring Connector - Trailer End

Item # PK11700
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Establish a secure connection between your trailer and semi or other tow vehicle with this heavy-duty, 7-pole plug. Plug has round brass pins to ensure minimum voltage drop and pull grips for easy insertion and removal. Lowest Prices for the best trailer wiring from Pollak. Pollak Heavy-Duty, 7-Pole, Round Pin, Trailer Wiring Connector - Trailer End part number PK11700 can be ordered online at or call 1-833-496-1390 for expert service.
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  • Reviews (92)
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  • Why etrailer?

Pollak Trailer Wiring - PK11700

  • Trailer Connectors
  • Trailer End Connector
  • 7 Round - Round
  • Plug Only
  • Pollak

Establish a secure connection between your trailer and semi or other tow vehicle with this heavy-duty, 7-pole plug. Plug has round brass pins to ensure minimum voltage drop and pull grips for easy insertion and removal.


  • Heavy-duty, 7-pole plug connects trailer to socket on tow vehicle
  • Round, floating, solid brass 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
  • Zinc, die-cast housing for durability
    • Tapered design with jumbo, finger-pull grips
      • Easy hand-position pull
      • 2 Hang-up holes
  • Cable lock with plated steel retainer screw
  • High-impact, ABS thermoplastic interior
    • Includes extended lip for easy removal and replacement
    • Accepts wide range of wire gauges - from #16 wires to #8 ground wire
  • Highest quality - meets and exceeds all standards of SAE J560
  • Interchangeable with all competitive ATA (American Trucking Associations) types


  • Volt rating: 6 volts - 28 volts
  • Current rating: 40 continuous-duty amps
  • Wiring configuration:
    • Color - circuit - recommended wire gauge:
      • White - Ground Return - 8 gauge
      • Black - Clearance, Side Marker, Identification - 12 gauge
      • Yellow - Left Turn and Hazard Signal - 12 gauge
      • Red - Stop Lamps and Anti-Lock Devices - 10 gauge
      • Green - Right Turn and Hazard Signal - 12 gauge
      • Brown - Tail, Rear Clearance, Marker and License-Plate Lamps - 12 gauge
      • Blue - Auxiliary Circuit/ABS - 10 gauge
  • 1-Year limited warranty

11-700 Pollak Heavy-Duty, 7-Way, Round Pin, Trailer Wiring Connector - Trailer End
Replaces 52024

Note: Does not fit Pollak Cable Guard (PK11763). Use Pollak HD, 7-Pole Round Pin Connector w/Cable Guard (PK11702).

Customer Reviews

Pollak Heavy-Duty, 7-Pole, Round Pin, Trailer Wiring Connector - Trailer End - PK11700

Average Customer Rating:  4.8 out of 5 stars   (92 Customer Reviews)

Establish a secure connection between your trailer and semi or other tow vehicle with this heavy-duty, 7-pole plug. Plug has round brass pins to ensure minimum voltage drop and pull grips for easy insertion and removal.


The quality of the items were excellent. Something in the shipping box was askew, There were no packing Materials. thankfully nothing was damaged. I have bough several items from etrailer and am a satisfied customer!


Luv If they don't have it you don't need it.


Solid product. Can't wait to get it installed. Going to use it as a auxiliary power device for my tractor hardtop. Lights and wiper hookups.


This is the plug that I needed for my Massey Ferguson tractor. Couldn’t find it locally.


The parts arrived quickly and look to be good quality l won't be using them for a while yet


The way the connector comes apart & goes back together is very sensible. The terminal connections can accommodate large wires - up to 12 gauge on all except for 1 that can go up to 10 gauge as far as I can remember. They could possibly handle larger but I didn't check since I didn't need the wires that large. They're labeled for standard 7-way trailer wire colors, which is useful for most people but I couldn't go by it. Mine was a custom application. If a spring strain relief came with it that would be awesome but I wouldn't expect it for the price I paid. Hope that info helps.


Packing,shipping&Item PERFECT!!! etrailer your the bomb !!!


I was very pleased with this connector. It is robust and of high quality for its cost. I'd highly recommend it.


Works great


Was exactly what I Wanted!


I searched locally for a 7-pin trailer plug without finding any round-pin styles only flat blade. I searched online and found this plug.
This plug is very well made, easy to connect wires to and fits the socket on my Kubota tractor.
Also, it was in stock and shipped much faster than I expected, which I greatly appreciated.

I am very pleased with the product. It is working great on my Kubota tractor.
Ed P - 09/10/2018


Still working great!!

Still working great,as when it was brand new.
Chris R - 11/21/2021


If you have any agricultural equipment, this is the easiest way to adapt the normal automotive style connectors to your vehicles and equipment. Great product, and as usual, has the best price and least expensive way of shipping it to you.

Still great,
Roger K - 09/14/2016


I got exactly what I expected. Great customer service & follow through.


I have a 1993 ford e150 with a factory I installed trailer connector round pin. I couldn't find a 7 to 4 match anywhere. Then I saw this pk11700 adapter and it worked great. Plus I have extra connectors now to add other lights. Great product thx


It came exactly as described, and in a timely manner.


The cable end plug arrived on the exact estimated date I was given on the day of ordering. Wiring it is very simple. There is a screw for each terminal opening. Use a small phillips screwdriver to thread the screw out, insert the wire, and then tighten the screw.
A retention clamp is an integral part of the plug. Again it is a simple matter of turning a screw to open it and tighten it back down again. The plug is well made and should last a long time. It is exactly the replacement part I was looking for.
I will come back to when I need related items. I highly recommend.


Just reviewed the truck receiver half of this product - same deal. Nice heavy parts - little plastic. Nice big round brass contact pins; due to the fact that these parts are cast, there is little chance of water/dirt/condensation working into the wire contacts. Locks in tight with the receiver. All in all, a good purchase.


Had to replace old connection that was worn out not working correctly. Fit perfectly.
Thanks for your help !!!


The plugs did what they were supposed to do, and the customer service was excellent.


It is very refreshing in this age of Internet shopping to find a site that provides good product information, competitive pricing and great customer before and after the purchase. Product was exactly what the product info on the site stated. Appreciate the good service and will definitely use for future needs.



Worked perfectly to replace an electrical plug one of our drivers ripped off by accident. Was able to save the whole harness for $10 with this!


Haven't wired up the connector yet. Would have been nice if the standard wiring diagram used through out the USA would have been included. Then the trailer would be wired correctly to any vehicle that was using it. Mine didn't have the trailer brake or back up lite shown.


Plug appears to be of very good quality and is as represented. We are using this plug to make an adapter harness to plug our RV into a semi tractor.


Wish came with the spring

Show More Reviews

See what our Experts say about this Pollak Trailer Wiring

  • What is an ICC Marker Light for a 60 Foot Gooseneck Trailer
    ICC stands for Interstate Commerce Commission. An ICC light is on a switch, though it could also be wired into another circuit such as the running lights. It is basically so that when you flip the switch the marker lights will flash. Typically this was only found on commercial applications (the trucking industry). The ICC was abolished in the mid 1990s. You can look up current regulations as specified for trailers by the Federal Motor Vehicle Safety Standard or FMVSS 108 for the US and...
    view full answer...
  • Could a 7-pin European Connector be Adapted to a Nato 12 Pin Trailer Connector
    I am sure there is a way to do it. We don't carry either style of connector though so I wouldn't have any parts I could recommend. You would need to track down the two connectors you would need. One that would plug into the your Range Rover and then one that would plug into your 12 pin Nato connection. You would need to also get wiring diagrams for both plugs and wire them by function to each other. I attached a couple pictures that should be helpful
    view full answer...
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  • Wiring a 4-Way Wired Trailer to a Round 7-Way Connector
    When wiring up a connector it is important to wire up everything by function and not color. Wire colors can vary from manufacturers so it is better to verify the function of each wire before installing it. Running both running light wires to the running light circuit will be fine. The main ground wire you ran from the connector to the frame will work to ground all of the circuits. One way you can test the functionality of the circuits is to use a jumper wire from a vehicle battery to...
    view full answer...
  • Brake Lights on 2012 Semi Trailer Work But Not Brake Lights on 2004 Freightliner
    Since your semi trailer brake lights are working but the tractor's brake lights are not working, it sounds like the wiring for the trailer lighting is independent of the tractor's brake lights. If all of the trailer lights operate as they are supposed to then I would first check the fuse panel in the tractor for a blown brake light fuse or perhaps for corrosion in the fuse holder. You can also check the individual brake lights on the tractor for signs of a weak ground connection (especially...
    view full answer...
  • Can a Combined Stop and Turn Signal Circuit be Converted to Separate Circuits
    Yes, there is a special converter, # 118158, that takes the combined circuit and separates out the signals to give you just turn signals and just brake lights on separate wires. You will install this converter on the trailer side, behind the connector. The left turn/brake goes to the yellow wire, the right turn and brake goes to the green wire. Make sure to ground the white wire. On the out put side the red wire is the brake lights only, yellow is left turn only, and green is right turn...
    view full answer...
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  • Wiring # PK11700 Pollak 7-Way Trailer Connector
    The white wire is typically ground, you can confirm this by checking to see if it connects directly to the trailer frame. Your yellow wire is usually the left turn and brake lamp, green is right turn and brake light. The yellow/black and green/black are running lights, with the green/black running down the passenger side and the yellow/black running down the drivers side. You can confirm this by using a car battery, grounding the white wire to the negative terminal, and applying 12-volts...
    view full answer...
  • Wiring a 7-Way Round Pin European Trailer Connector
    Usually a brown wire contains the running light circuit. However, you cannot go by wire color because it always varies from trailer to trailer. You will want to trace the wire back to where it leads on the trailer to determine its function and then make the connection in the trailer connector as needed. If you have a European 7-Way then it will be a little different. I have included a picture that shows the typical functions of a European 7-Way.
    view full answer...
    Image 1 for
  • Trailer Wiring Harness is Funtional Except Trailer Brakes
    Since every other function works, my guess is the brake magnet wires have a problem. One wire from each assembly magnet should be wired to the brake controller wire. The other should be grounded. Since they work when you provide an alternate ground via the tester, I assume the ground is the problem. The first thing I would do is check these grounds. The closer the ground connection is the the brake assembly the better. There may be a break or a pinch on the brake wire going from the trailer...
    view full answer...
  • Wiring Diagram for the Pollak Heavy-Duty, 7-Pole, Round Pin, Trailer Wiring Connector # PK11700
    Yes, the 7-Pin Round connector is wired differently than the 7-Way flat RV connector. I will list the typical heavy duty truck wiring connections inside the plug on the trailer side for you. At the index guide for plugging the trailer end in to the vehicle end the pin directly below will be the ground connection. Going clockwise the pin in the 1 o clock position is for 12 volt power the pin in the 4 o clock position is the left turn signal and hazard the pin in the 6 o clock position is...
    view full answer...
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  • Power Rating of Pollak Heavy-Duty, 7-Pole Trailer Wiring Connector, Part # PK11700
    The 40 amp continuous rating refers to the whole plug, not each individual circuit that it can carry.
    view full answer...
  • Is it Normal to Only See 9 Volts on the Output Circuit of a Brake Controller
    Brake controllers allow you to vary the voltage applied to the trailer brakes to allow for different braking power. If the controller is set to it's max output voltage it should be right at 12 volts. Be sure to have the vehicle running too so that you don't see any voltage drop off just from the alternator. If the controller has it's gain turned all the way up and it's only at 9 volts then that would indicate you have an internal problem and the controller would need to be replaced. I...
    view full answer...
  • Why Would Trailer Brake Controller Circuit Always have Pulsing Signal On Circuit
    The pulsing you are seeing on the brake controller output circuit is normal. That is the controller testing the circuit to see if it detects the load of trailer brake magnets. If it detects the magnets it will show that the controller is connected. If it doesn't sense anything the controller shows that it is not connected to a controller. The problem has to be on the car hauler trailer. First thing to check is for corrosion on the trailer connector as that typically is what prevents brakes...
    view full answer...
  • How Many Volts Should I Get to the Trailers Brakes When Pressing the Brake Pedal
    You should get 12 volts coming from your brake controller if the controller is set on its highest setting. If your not, the first thing to do is to examine the trailer connector for any corrosion or debris and clean it if necessary. You'll also want to check the ground wires for the magnets and the brake circuit wire from the brake controller for any damage or pinches.
    view full answer...
  • Troubleshooting Trailer Wiring that Stops Working With Headlights on
    Try improving the connection of the main ground wire of the trailer wiring harness. Make sure it is attached to a clean metal surface. Or you can run all of the trailer wires back to the main ground. This is actually the ideal solution. But you can also check the current grounds for the lights to make sure they are making a solid connection to a clean metal surface. What you described is the classic insufficient ground scenario so finding a way to improve the grounds will fix the problem.
    view full answer...
  • Diagram of Vehicle and Trailer Side 7-Way Round Pin Trailer Connectors Functions
    The diagram also shown here is showing the outside and inside of just the trailer side connector of a 7-Way round pin. It is not showing the vehicle side which would be a mirror opposite. I have also included a vehicle side diagram that shows the outside and inside configurations.
    view full answer...
    Image 1 for Image 2 for
  • Troubleshooting Gooseneck Trailer that Has no Trailer Brakes After Using 7-Way to 6-Way Adapter
    For an adapter to go from a 7-way on a vehicle to a 6-way on a trailer you would want the part # 47549. The center pin is set-up as the hot lead but can easily be changed to work with trailers that have the center pin wired as the brake. It sounds like you may have the brake output circuit backwards on your 6-way setup for what you would need. On your trailer 6-way you can swap the circuit in the 1:00 position as you face the connector with the center pin and the problem should go away.
    view full answer...
  • What is the Function of the Red Wire on a Pollak 7-Way Trailer Connector/Wiring Harness
    On a Pollak 7-Way trailer connector/wiring harness the red wire is for left turn signal and brake light functions. On many aftermarket wiring harnesses you usually see a yellow wire for left turn and brake lights at the trailer connector. But on a Pollak 7-Way the red wire takes that function. I have included a link to our help article on trailer wiring which includes diagrams of the front and back of both vehicle and trailer side connectors.
    view full answer...
  • Wiring Trailer Brake Magnet with 1 Black Wire and 1 Red/Black Wire
    On many brake magnets it does not matter which wire is ground and which is power. It is likely that the red/black wire was used as the power wire and the all black wire was the ground.
    view full answer...
  • How to Determine Wire Functions on a Tandem Axle Dump Trailer
    Trailers in the US have combined turn signals and brake lights on the same circuit. So it is likely that the yellow wire is left turn/brake lights, green is right turn/brake lights and brown is running lights. That leaves black and red. One of them is the ground, likely black, and the other is for another function, possibly 12 volt power or for an electric reverse lockout if the trailer has hydraulic brakes. The easiest way to determine wire function would be to run power using a separate...
    view full answer...
  • Why are there So Many Different Trailer Connectors and Ways to Wire Them
    If you think we have it bad here in the states try going to Europe where they have a 7-Way that does the same things as our 4-Way and some kind of 13-Way to do what our 7-Way does! In the US the biggest issue is the 2 different ways that a 6-Way round connector can be wired. The center pin will either be for electric brakes or 12 volt power. Usually when the brakes immediately lock up it is because the 12 volt circuit on the vehicle connector or adapter is wired one way and the one on...
    view full answer...
  • Brakes Lock Up On Trailer When Plugged Into 2015 Chevy Silverado 2500
    I am almost certain that the issue is that the connector on your 2015 Chevy Silverado 2500 and the one on the trailer are pinned out differently. I have included a picture that shows how a vehicle and trailer side 7-Way are wired (ignore the colors and go by function). It sounds like the brake output pin on the trailer is matched up with the 12 volt pin on the truck. As soon as you plug in the trailer the brakes will be getting 12 volts so they lock up. All you have to do is configure...
    view full answer...
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  • Troubleshooting Flickering Trailer Running Lights Circuit
    Most likely the problem is a slightly dirty trailer connector. You will need to take some fine grit sandpaper to the running light circuit of your trailer wiring harness on your vehicle and trailer to clean off any dirt or corrosion that would cause an intermittent connection. I attached a help article on troubleshooting trailer circuits for you to check out as well.
    view full answer...
  • How to Determine Trailer Wire Functions When Rewiring Connector
    It's pretty hard to say what the extra circuit would be since wire colors aren't always consistent among vehicles/trailers. Since you have what sounds like a trailer your best option would be to use a jumper wire from a 12 volt battery like from a car to apply voltage to all of the wires to see what activates on the trailer and then wire it accordingly to your new connector.
    view full answer...
    Image 1 for
  • Troubleshooting Trailer Brakes that Lock Up When Trailer Connector is Connected
    It sounds like the 12 volt accessory circuit has either been ran to the brake output circuit or it is shorting out to it. Most likely the problem is on the trailer wiring side of the equation as it looks like your truck is brand new. If you check out the diagram I attached you will see how a 7-way connector is typically wired for you to compare to the 7-way on your trailer. To check for shorts you would need to go over the wiring of the connectors looking for any bare wire that might...
    view full answer...
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