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

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

Item # PK11720
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Pollak 7 Round Wiring - PK11720
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Establish a secure connection between your trailer and semi or other tow vehicle with this 7-pole, solid pin, wire-insertion-style socket. Zinc die-cast socket is self-grounding and includes floating pins for easy alignment and maximum pin contact. Lowest Prices for the best wiring from Pollak. Pollak Heavy-Duty, 7-Pole, Round Pin Trailer Wiring Socket - Vehicle End part number PK11720 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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  • Reviews (65)
  • Q & A (107)
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Pollak Wiring - PK11720

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

Establish a secure connection between your trailer and semi or other tow vehicle with this 7-pole, solid pin, wire-insertion-style socket. Zinc die-cast socket is self-grounding and includes floating pins for easy alignment and maximum pin contact.


Features:

  • Zinc die-cast 7-pole socket connects trailer to towing vehicle
  • Round, floating, solid brass pins
    • Easy alignment and maximum contact
    • Minimum voltage drop is ensured
    • Dielectric (non-conducting) grease coating
      • Protects against corrosion and resistance
    • Wide range of wire gauges acceptable, from #16 wire to #8 ground wire
      • Ground terminal accepts minimum #14 gauge - maximum #8 gauge
      • All other terminals accept minimum #16 gauge - maximum #10 gauge
  • Self-grounding to #1 Ground Terminal
  • Slant-mounted with built-in drain slot on cover
    • Rids housing interior of accumulated moisture
    • Opens and closes with stainless steel spring
    • Bottom lip extended for better plug support
  • 2-Hole mounting style
  • Highest quality - meets and exceeds all standards of SAE J560
  • Interchangeable with all competitive makes


Specs:

  • Mounting dimensions: 2" diameter hole
  • Volt rating: 6 volts - 28 volts
  • Current rating: 40 continuous-duty amps
  • Wiring configuration:
    • Color - circuit - recommended wire gauge:
      • White - Ground Return - 10 gauge (FMVSS-121 Anti-lock Gauge - 8)
      • Black - Clearance, Side Marker, Identification - 12 gauge
      • Yellow - Left Turn and Hazard Signal - 12 gauge
      • Red - Stop Lamps and Anti-Lock Devices - 10 gauge (FMVSS-121 Anti-lock Gauge 10)
      • 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


11-720 Pollak Heavy-Duty, 7-Way, Round Pin Trailer Wiring Socket - Vehicle End
Replaces 52016






Customer Reviews

Pollak Heavy-Duty, 7-Pole, Round Pin Trailer Wiring Socket - Vehicle End - PK11720

Average Customer Rating:  4.9 out of 5 stars   (65 Customer Reviews)

Establish a secure connection between your trailer and semi or other tow vehicle with this 7-pole, solid pin, wire-insertion-style socket. Zinc die-cast socket is self-grounding and includes floating pins for easy alignment and maximum pin contact.

- PK11720
by:

Not using on a trailer, but making disconnect harness for quick attach snowblower to loader arm. Connection cord is 7 pin tractor trailer tether, Worked well. 696145



- PK11720
by:

replaced the plug socket on my 2012 silverado. The plug worked great. 903961



- PK11720
by:

Quality product 861242



- PK11720
by:

Pure awesomeness. Best I've ever owned by far. 783628



- PK11720
by:

Great price and service. 735404



- PK11720
by:

I was able to find the product very easily on the website. The part was shipped fast, and arrived fast. Paying for the product was fast and easy with PayPal it was also secure. The part was clean and steady, with all the requested materials in the box. 704001



- PK11720
by:

Just got the order looks great Pollak parts like these are the real thing not like Pollak market fakes that I have now, nothing but trouble. They are made heavy. I have not put them on yet but getting ready to . When I get finish and use them awhile I will do this again and update this review. Pricing and shipping are great. 692819



- PK11720
by:

For me, and probably you, etrailer.com 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. 678748



- PK11720
by:

A classic that works perfectly 629664



- PK11720
by:

Have not used this yet but it looks like it is made with quality. I look forward to having it for use on my pickup truck. 599922



- PK11720
by:

Great quality. 599837



- PK11720
by:

very well made, make sure to get the rubber boot with it. 598390



- PK11720
by:

Every bit as good as it looks in the picture, Grest product, highly recommend 589556


Comments
Don’t use too often, as it’s installed on a farm tractor, however it still looks great, and functions as well as it did on the day I installed it.
Randy - 12/11/2019

63758

- PK11720
by:

Just as described 579723



- PK11720
by:

Good sturdy built product delivered timely. No hassles. 544338



- PK11720
by:

No issues, all the hardware was correct and the item is still working. 512863



- PK11720
by:

Best 7 pole connector out there!!!! 485388



- PK11720
by:

Very durable and easy to install for my customers. Thank u for the help 475737



- PK11720
by:

Well built heavy duty 465824



- PK11720
by:

I could not find this style or make trailer plug in my local auto parts store. I got tired of trying to find it so I ordered it on line. etrailer was convenient and less expensive than any other website. 452467



- PK11720
by:

looks good I would buy again 446765



- PK11720
by:

Great Product 440871



- PK11720
by:

Work great thanks. 438101



- PK11720
by:

Worked like a charm. Had a mishap with items ordered vs items shipped, but they fixed it quick. Great company! 429767



- PK11720
by:

ok 413012


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Show More Reviews

Ask the Experts about this Pollak Wiring

  • Solution for Towing Trailer with 7-Way Round and Separate Lighting with Ford F-350
    We actually do have wiring adapters available that go from a 7-Way blade connector on the truck to a 7-Way round on the trailer, such as with the Pollak # PK12727, however since the circuits are separated on the trailer side an additional converter would still need to be added and the adapter itself would likely need to be re-wired. For this reason I recommend going a different route. I honestly think the easiest solution is going to be to simply add a second 7-Way on your truck, using...
    view full answer...
  • Wiring Diagram for Pollak Heavy Duty 7-Way part # PK11720
    The Pollak Heavy Duty 7-Way part # PK11720 that you referenced is a heavy duty style 7-way. If you check out the attached diagram you'll see how it should be wired.
    view full answer...
  • How to Find the Stop Light Circuit on a 2018 Jeep Grand Cherokee
    For starters, have you checked for the brake controller adapter port under the drivers kick panel near the emergency brake pedal (see video). If not I recommend doing so as most of these vehicles came with the brake controller adapter port regardless if yours came with the factory tow package or not. If you have a Tekonsha brake controller like the Tekonsha Prodigy P3 Trailer Brake Controller part # 90195 and you have the brake controller adapter port then you can use the Tekonsha Plug-In...
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  • Installing Brake Controller and Trailer Connector on 2003 Chevy Blazer
    Your Blazer is not prewired for a brake controller, but one can be installed using our Brake Controller Install Kit, part # ETBC7. The kit contains everything necessary to install a controller, including the 7-way connector. The 7-way connector included in the kit is actually an adapter meant to be plugged into an existing 4-pole trailer connector, but the connector on the adapter could be cut off and directly wired to the existing wires you located near the spare tire. The white wire...
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  • How To Find Cold Side Of Stop Light Switch On Vehicle For Brake Controller Installation
    Normally you can find the brake light switch under the dashboard at the top of the brake pedal. There could be a number of wires attached to the switch so you can use a tester like part # 40376 to test the wires. Since the auto manufacturers can use different color wires it is always best to use a tester and check the wires for function and not color. You would need to find the wire that only shows power when the brake pedal is pressed. That would be the wore that gets attached to the...
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  • No Brake Signal on a 7-Way Round Pole Trailer Connector on an RV r
    If your RV came with a 7-Way round pole trailer connector then it could be that there are fuses or relays that need to be in place or replaced if present to make the 7-Way fully functional. Check the owners manual to determine the location of any fuses or relays related to the trailer connector. If you hardwired in the trailer connector and the RV has separate turn and brake lights then the brake circuit will not be present with the turn signals on the 7-Way. You would need to covert...
    view full answer...
  • Is it Better to Switch to a 7-Way Blade Style Trailer Connector Over a 7-Way Round Pin
    The 7-Way blade style trailer connector is the most common 7-Way in use at this time. It would be beneficial to switch to this style. However, if you already have a 7-Way round connector you can just use an adapter to go to a 7-Way blade style when needed. You can use # PK12-724. If you want to go ahead and switch from the 7-Way round to the blade style I recommend a multi-tow connector, # HM48470, which has a 7-Way blade style, a 5-Way flat, and 4-Way flat. All you will need to do is...
    view full answer...
  • Installing 7-Way Trailer Connector and Brake Controller On 2003 Chevy Blazer
    To install a 7-Way blade style RV connector and brake controller on your 2003 Chevrolet Blazer, you will need to install the Brake Controller 7 and 4 Way Installation Kit, part # ETBC7. To begin, since there is not a factory 4-way on your truck, you will want to just cut the 4-way connector off that is connected to part # ETBC7. Those wires will need to be spliced into the correct wires on your vehicle, you will want to use a circuit tester, part # 40376, to test functions of the wires....
    view full answer...
  • Recommended 7-Pole Round Plug & Play Wiring Harness Adapter for 2005 Ford Super Duty Factory Wiring
    It sounds like your 2005 Ford Super Duty was outfitted with the 7-way blade system which is the most common in the market today. To adapt your 7-way blade to a 7-pole round for your trailer, I recommend the Pollack # PK12728. This 7-pole connector is prewired to simply plug into your truck's 7-way plug. It has the # PK11720 connector you referenced but is pre-wired like you are desiring. A great mounting bracket for the # PK12728 is the # PK11771. I have linked all the above...
    view full answer...
  • How to Wire the Pollak 7-Pole, Round Pin Trailer Wiring Socket - Vehicle End # PK11720
    On the back of the Pollak 7-Pole, Round Pin Trailer Wiring Socket - Vehicle End, part # PK11720, it is marked alongside the pin with the color of the wire that connects to that pin location. I am also including a photo that will show a 7-Way round pin connector for the vehicle end with the colors and functions listed for each pin. I am also including a link to a FAQ page on trailer wiring.
    view full answer...
  • Mounting Hole Dimensions for the Pollak Heavy-Duty, 7-Pole, Round Pin Trailer Wiring Socket
    The distance between the mounting holes for the Pollak Heavy-Duty, 7-Pole, Round Pin Trailer Wiring Socket # PK11720 is 3" on center. I have attached a photo to demonstrate this as well as a review video where this measurement is shown. We also carry the Pollak Bracket # PK11771 which can help make installing this socket easier. This has 1/4" diameter holes to mount the socket and then 1/2" x 3/8" mounting holes for the bracket itself. The mounting hardware is sold separately but can...
    view full answer...
  • Troubleshooting No Trailer Running Lights on a 2008 Nissan Frontier
    If the harness you installed is aftermarket and not from the factory, then the taillights will not work unless you have a factory tow package. If you do not have a factory tow package, you can use a different harness, # 119179KIT. I have included installation details and an installation video below. I checked a colleagues truck, he has a 2004 model, so there may be some differences. But, there are some fuses under your hood, passenger side, that may say something like HD tail light....
    view full answer...
  • Rubber Boot For Wire Protection On Pollak Trailer Wiring Socket - Vehicle End, # PK11720,
    Yes we do sell a rubber socket boot for the Pollak Heavy-Duty, 7-Pole, Round Pin Trailer Wiring Socket - Vehicle End, # PK11720. The product is Pollak 7-Pole Rubber Socket Boot, # PK11761, that fits over the back of the socket. Our website is not showing a picture right now so I will send you a separate email with a picture of the rubber boot.
    view full answer...
  • Wiring Configuration For 7-Way Vehicle And Trailer Connectors
    I have attached a photo that details the wiring connections for a 7-pole round pin connector. It also includes the vehicle side wiring as well. I have also attached a photo of the 7-way blade style connector as well. The center plus is an auxiliary 12V circuit. I do recommend using a circuit tester like part # 40376 and test each wire on the vehicle to make sure you have the correct configuration on your connector. I have also attached a link to a helpful article about trailer wiring...
    view full answer...
  • Troubleshooting a Pollak 7 Way Vehicle Connector Plug Wiring Malfunction
    I agree it sounds like there is a wiring issue, and to get the functions to work properly you will have to re-wire the vehicle connector. Please keep in mind that you do not want to rely on color alone to diagnose the wiring functions, it is always recommended to test and verify function of the wire. You will need a circuit tester like part # 40376 to verify these functions. I have included a helpful article that shows typical wiring for both the trailer and vehicle connectors. Since...
    view full answer...
  • 7-Way Trailer Connector for 1996 Airstream Travel Trailer
    I do not have dependable reference material showing exactly which trailer connector a 1966 Airstream might've used, but the most simple solution in your case would be to remove the existing plug and replace it with one that's compatible with the much more common 7-way blade connector, which is what most manufacturers use as original equipment on later model trucks. You can simply disconnect the wires from the rear of your existing plug and install a plug like # PK12706. You'll need...
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  • Semi Trailer Light Function Locations on Heavy Duty 7-Way Pin Connection
    On a 7 pin round which is the common connection on a semi trailer, the clearance/marker lights are at the 10 o clock position when you look at the trailer wiring connection. When looking at the connector on the back of the truck, that will put the same function at the 2 o'clock position pin. I've attached a photo of each to assist.
    view full answer...
  • Difference Between Solid and Split Round Pin 7-Way Connectors
    I spoke with my contact at Pollak regarding the difference between a solid pin 7-Way round connector like # PK11720 and a split pin round connector like the 11-721 that you mentioned (which we don't have available). He said that the difference really comes down to how the pins make contact with the vehicle side connector but in reality there isn't an advantage with the split pin style. He said that the "old school" way of thinking was that with a split pin design a user could potentially...
    view full answer...
  • Parts Needed to Add a 7-Way Trailer Connector and Brake Controller to a 1972 Chevrolet Pickup
    We have everything that you will need to add a 7-way trailer connector and a brake controller for trailer brakes to your 1972 Chevrolet pickup. You will need a 4-Way Wiring Kit, # 18252, the 7-way and 4-way Installation Kit, # ETBC7, and a brake controller, I recommend the Prodigy P2, # 90885. The first thing to do is to install the 4-way wiring kit, # 18252. This kit includes a wiring harness with a 4-flat trailer connector, a circuit tester and 4 quick splices. To install this wiring...
    view full answer...
  • Pin-Out Wiring Diagram for a Trailer Side and Vehicle Side 7-Way Blade Style Trailer Connector
    I can certainly help you out. First, I have included a link to our wiring FAQ article that shows how to wire both the vehicle side and trailer side connectors. The section you need is about in the center of the article and says 7 Way Trailer Connector followed by 7 Way Vehicle Connector. I will also give you a quick explanation below. When looking at the back of the TRAILER SIDE connector where the wires attach: 1 oclock position (pin 4) = 12 volt battery power 3 oclock position...
    view full answer...
  • Wiring Diagrams for 7-Way Round Trailer Connectors
    I attached a diagram that shows how most 7-way rounds like the # PK11720 that you referenced will get wired up. As long as you got yours wired up correctly and your trailer taillights and brakes are functioning correctly that's all that should matter, but occasionally there are some trailers that end up wired slightly different than others so the diagrams we offer don't match up perfectly. In those cases you have to wire up everything by function so that everything matches up properly....
    view full answer...
  • Low Voltage on Pollack 7-Pole Trailer Connector Right Turn Signal Pin on a 2002 Toyota Sienna
    On the back of the connector where the wires attach check for dirt and corrosion and clean any that you find. You may need a new connection there so cut the wire, strip off some of the insulation, and reconnect after cleaning the connector. Do this for any of the wires that appear to need it. Also check the main ground from the connector to the vehicle. It should be attached to a clean and corrosion free bare metal surface. You can also try moving the ground to a different location...
    view full answer...
  • Adding Reverse Lights To Semi Trailer 48 Foot Flatbed Through Connecting to 7-Way
    If you use the 7-way that is used for commercial/industrial/agricultural application like # PK11720 or the RV/standard 7-way like # HM47210 you will need to utilize the same location. The reverse signal should be connected to the center location of either application. You will simply need to make sure your wiring corresponds with the function locations. I've attached a photo to assist. For a 7-pin that normally does not have a reverse light, that means utilizing the auxiliary in...
    view full answer...
  • Adapter to Convert 7-Way Blade Style Connector on Vehicle to 7-Way Round Pin Connector on Trailer
    It sounds like your trailer has a 7-way round pin connector. For an adapter, I'd suggest part # PK12727. The adapter would plug into the existing 7-way on your truck, and provide a 7 round pin female connector for the plug on your trailer. You might also consider removing the existing 7-pin connector from the trailer, and replacing it with the 7-way blade plug like part # A7WCB. The 7-way round pin is getting fairly close to being obsolete. The 7-way blade connector is much more prevalent. I'll...
    view full answer...
  • Locating Cold Side of Brake Light Switch on 2013 Chevy Equinox
    The best and safest way to determine which wire is the cold side of the brake light switch on your 2013 Chevy Equinox is to simply test them with a circuit tester like # PTW2993. You are looking for the wire above the brake pedal that only receives power with the brake pedal depressed and no power with any other function. The correct wire on earlier model years of your Equinox was light blue with possibly a white stripe. You can start by testing this wire. Since vehicle manufacturers...
    view full answer...
  • What Wire Color Codes and Functions Are Used for Pollak Connecter 12-705 and PK11720
    There is no industry standard wiring code. Pollak uses the following: White - Ground Return Black - Clearance, Side Marker, Identification Yellow - Left Turn and Hazard Signal Red - Stop Lamps and Anti-Lock Devices Green - Right Turn and Hazard Signal Brown - Tail, Rear Clearance, Marker and License-Plate Lamps Blue - Auxiliary Circuit/ABS We have a different combination of colors we use for specific functions which you can see in the wiring FAQ article that I have linked. Finally,...
    view full answer...
  • Finding the Cold Side of Brake Switch on Jeep
    The only way to find the cold side of the brake switch wire on your 2011 Jeep Liberty would be to use a circuit tester such as # 40376 and find the wire that only has power when the brake pedal is depressed.
    view full answer...

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Info for this part was:

Expert Research:
Jackie C
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Mike L
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Michael H
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Jeff D
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Reno H
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Jameson C
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Rachael H
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Written by:
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