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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

Our Price: $15.30
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Trailer Wiring
Shipping Weight: 0.52 lbs
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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. Great 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 1-800-940-8924 for expert service.
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  • Reviews (99)
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Pollak Trailer Wiring

  • 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).

Item # PK11700

Customer Satisfaction Score:

Customer Reviews

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

Average Customer Rating:  4.8 out of 5 stars   (99 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.


Plug is great it comes w/o the wire releaf support at the tail end of plug.


the connector is "as advertised" (which is refreshing) it needs some sort of protective cover of the wires as they enter the plug, but maybe it is available and i didn't see to order it. I would buy it again.


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


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


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.

Ed P.


I am very pleased with the product. It is working great on my Kubota tractor.


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



This is a quality connector that was used to support electrical connections between my RV and toad. Its held up beautifully & I continue to be very pleased with it.


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



I bought it to use on my tractor, but decided to wire accessories different. I may use the plug at a later date.


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.

Roger K.


Still great,


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.


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


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


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.


I ordered the wrong part, so never used 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.


i did not realize there are TWO different sizes of 7 pin round connectors ?? apparently i have the smaller one and the one i got was way to BIG .....


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.



For me, and probably you, is a great place to shop/buy quality products. They give great follow up after ordering and fast shipping @ a fair price. I believe their service & pricing is unbeatable. I do shop for bargains & etrailer is @ the top of my list.


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!


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!


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.


I have used this connector on an equipment trailer for the last year with no issues. It has worked flawlessly. It was a good decision to go with this item.


Product arrived timely and in excellent condition. It came with SAE J560 instructions that were helpful. Wiring the connector was easy.


Quality and exceptional customer servic e.


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.

Show More Reviews

See what our Experts say about this Pollak Trailer Wiring

  • Troubleshooting Trailer Wiring Where All the Pins of 7-Way Have Voltage on Them
    If all of the pins on your 7-way trailer wiring connector have voltage on that would indicate that you have a short most likely between the 12 volt accessory circuit and the other circuits. I'd recommend going over the wiring behind the 7-way looking for any cut or exposed wire and fix as needed. I attached a help article on troubleshooting trailer wiring for you to check out as well.
    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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  • 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...
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  • High Voltage for Running Lights Circuit on Vehicle Side Connector
    You are correct that normally you will see around 12 volts of power at the vehicle connector for the running lights circuit but the fact that you are testing 13.5 to 13.8 volts is not out of the ordinary and it does not indicate any kind of issue. This is not too high. As long as your trailer lights are working as they should when the trailer is connected you are good to go!
    view full answer...
  • 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...
  • 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...
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  • 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...
  • Can Auxiliary Circuit of 7-Way Trailer Wiring Connector be Used for Brake Output Circuit
    The auxiliary pin of your 7-way can be used for whatever you need it to be. So if you wanted to use it for a brake controller output circuit you certainly could. It's possible the current circuit you are using has a short on it to other trailer wiring functions which is why yours doesn't like to work with it's current setup. Seeing if you can find a short and fixing as needed might be your better option.
    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...
  • 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...
  • 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...
  • Should Blue Wire on Trailer Have Power
    The blue wire on a trailer is typically the output wire to the electric brake assemblies. If this is the case on your trailer then the wire should only have power when you are hooked up to the tow vehicle and are applying the brakes, either by pushing on the brake pedal or by using the manual override lever on the brake controller. Since trailer wiring colors aren't always consistent I do recommend verifying that this is the function of your blue wire. You can simply follow the wire along...
    view full answer...
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  • Trailer Brakes Humming When Connected to Tow Vehicle
    The trailer brake controller on your tow vehicle will send a small pulse charge to sense if a trailer is connected, so the small amount of power you are testing at the brake output pin on the 7-Way without the brakes engaged is normal. If you are hearing a buzzing or humming sound coming from the brake assemblies though as soon as you connect the trailer (without engaging the brakes) then I do recommend inspecting the wiring around brakes to make sure there aren't any exposed or pinched...
    view full answer...
  • Continuous 12V in Aux Pin on 7-Pin Round Connector?
    When using the Pollak Heavy-Duty, 7-Pole, Round Pin, Trailer Wiring Connector - Trailer End # PK11700 the key on 12V power depends on the vehicle. Some vehicles will have a keyed 12V power and others will have a constant 12V that runs even when the key isn't present. That 12V power will be on that center Auxiliary power pin. The running light circuit will also technically have 12V keyed power.
    view full answer...
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  • 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...
  • 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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  • Where Does Trailer 12 Volt Aux Circuit Run on Trailer Wiring
    The 12 volt aux circuit of trailer wiring would run to your breakaway kit and trailer battery on the trailer side and then on the vehicle side would run to the positive post of the vehicle battery.
    view full answer...
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  • Is Center Pin on Pollak Heavy-Duty 7-Pole Connector # PK11700 Required for ABS Brakes
    If you have a commercial trailer with air brakes and it doesn't have an onboard ABS system then the 7th/center pin on the Pollak 7-Pole Round Pin Connector # PK11700 would need to be active. It really just depends on your trailer's particular setup. Otherwise the center pin can simply be used for auxiliary function or not used at all. I have attached a short video demonstration on this connector that you can also check out.
    view full answer...
  • Should Trailer Brake Output Circuit of Trailer Connector have 12 Volts all the Time
    The brake output pin shouldn't have any voltage on it when the brakes aren't applied. If there's voltage on this pin it's going to activate the trailer brakes. Since you are seeing 12 volts all the time you most likely have a short between the 12 volt accessory circuit of the trailer wiring and the brake output circuit. Check the back of the trailer connectors for shorts and fix as needed.
    view full answer...
  • 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...
  • Wiring a U.S. 7 Pin to European 7 Pin
    U.S. 7 pins such as Pollak # PK11700 have different functionality than European style 7 pins, as the Euro style is essentially equivalent to our 4 way. What you are going to need to do is match up the wiring from both connectors; I've added a pair of diagrams which is going to show you the functions of each connector. Following this should allow you to wire the pair of connectors together.
    view full answer...
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  • 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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  • Can Smaller Gauge Wire Be Used For 7-Way Trailer Connector
    The wiring gauge recommendations for the Pollak Heavy-Duty, 7-Pole, Round Pin, Trailer Wiring Connector, item # PK11700, are listed below. 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 Since...
    view full answer...
  • 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...

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