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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
Our Price: $15.91
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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 - 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 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 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.


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.


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

  • 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...
  • 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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  • 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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  • 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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  • 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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  • 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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  • 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...
  • 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...
  • 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...
  • 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...
  • 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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  • 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...
  • Which Pins on a Heavy Duty 7-Way Round Trailer Connector are Power and Ground
    I attached a diagram that shows a heavy duty 7-way pin out like the part # PK11700 that you referenced (diagrams on right of pic). The 12 volt circuit is normally in the center pin, and the ground is normally the top one. The colors aren't always standard on applications so best option is to determine function by pin location instead. Power MIGHT be black and ground most likely is white though.
    view full answer...
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  • Installing Trailer Plug for Correct Wiring Location for Trailer Functions
    Rewiring the Pollak Heavy-Duty, 7-Pole, Round Pin, Trailer Wiring Connector - Trailer End # PK11700 simply means disassembling it. The outer housing has a screw to release the connector and give you access to the screws for each wire. You will simply loosen the screws as much as possible and slowly and firmly pull the wire with a pliers. I've attached an article to assist with the correct locations for the rewire.
    view full answer...
  • Trouble Shooting Trailer Brakes That Are Weak or Not Working With a Brake Controller
    The Tekonsha Prodigy P3 # 90195 should be pushing 12 volts when on full power or when using the manual override lever. The trailer brakes should be drawing somewhere between 3.2 to 4 amps. From what it sounds like, you are within these parameters, so odds are you are having a ground issue with the trailer. Especially with the front axle locking when power was applied. What I would do is ground each brake separately and double check any other ground wires. You will want to make sure all...
    view full answer...
  • 7-Way Round Trailer Connector Recommendation
    Can you send me a picture? Sounds like you need the # PK11700 which is a 7-way round connector that will fit what you have on your truck if the pins happen to be round. I attached a picture that has both styles of 7-way pictured so that you can verify what you have.
    view full answer...
    Image 1 for
  • 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...
  • 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...
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  • Troubleshooting Using 7-Way to 5-Way Adapter that Locks Up Brakes
    A lot of times we see a similar issue with 6-way connectors or 6-way adapters. The issue with them is that there are two different ways a trailer 6-way will get wired and the difference is that the 12 volt and brake signal get swapped. So what this means is that either your adapter is wired strangely or your trailer wiring is. Most likely it's the trailer as adapter manufacturers typically aren't as prone to wiring issues as people are when they wire up trailers. You're going to want 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...

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