bing tracking image
  1. Trailer Wiring
  2. Pollak
  3. Trailer Connectors
  4. Vehicle End Connector
  5. 7 Round - Blade
  6. Plug Only
Pollak Metal 7-Pole, RV-Style Trailer Socket - Vehicle End

Pollak Metal 7-Pole, RV-Style Trailer Socket - Vehicle End

Item # PK12703
Our Price: $11.25
You Save: 64%
Trailer Wiring
Shipping Weight: 0.5 lbs
Add to cart
In Stock
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

Customer Photos


Need help with installation?
Locate installers near me
Establish a secure connection between your towing vehicle and trailer with this 7-pole, RV-style socket. Metal socket has non-corroding, shock-resistant interior design that eliminates shorting out and is color coded to RVI standards. Great Prices for the best trailer wiring from Pollak. Pollak Metal 7-Pole, RV-Style Trailer Socket - Vehicle End part number PK12703 can be ordered online at or call 1-800-940-8924 for expert service.
  • All Info
  • Reviews (86)
  • Q & A (0)
  • Photos

Pollak Trailer Wiring - PK12703

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

Establish a secure connection between your towing vehicle and trailer with this 7-pole, RV-style socket. Metal socket has non-corroding, shock-resistant interior design that eliminates shorting out and is color coded to RVI standards.


  • Standard, 7-pole, RV-style socket connects tow vehicle to trailer
  • Heavily plated metal construction
    • Resistant to weather and corrosion
  • Non-corroding, shock-resistant interior design
    • Terminal reinforcer dams eliminate shorting out
      • Prevent contact from spreading
    • Center pins accepts up to 8-gauge wire
    • Vinyl inserts keep out dirt and moisture
  • Spring-loaded cover with stainless steel spring
  • Safety latch
    • Ensures connector is plugged into socket
  • Color-coded to RVI standards


  • Wiring configuration:
    • Color - circuit - recommended wire gauge:
      • White - Ground - 10 gauge
      • Blue - Electric Brake - 12 gauge
      • Green - Tail, License and Running Lights - 14 gauge
      • Black - Battery Charge - 10 gauge
      • Red - Stop and Left-Hand Turn Signal - 14 gauge
      • Brown - Stop and Right-Hand Turn Signal - 14 gauge
      • Yellow - Auxiliary Circuit - 14 gauge
  • At its widest point, the diameter of the round portion 1-7/8"
  • Mounting holes are 1-1/2" from center to center vertically and 2-3/16" from center to center horizontally
  • 1-Year limited warranty

12-703 Pollak Metal 7-Pole, RV-Style Trailer Socket - Vehicle End
Replaces 30310

Customer Satisfaction Score:

Customer Reviews

Pollak Metal 7-Pole, RV-Style Trailer Socket - Vehicle End - PK12703

Average Customer Rating:  4.8 out of 5 stars   (86 Customer Reviews)

Establish a secure connection between your towing vehicle and trailer with this 7-pole, RV-style socket. Metal socket has non-corroding, shock-resistant interior design that eliminates shorting out and is color coded to RVI standards.


The plastic plugs don’t hold up very well in the bed of the truck to plug in the 5th wheel trailer in nothing can beat the metal ones


like the flush mount and compact of socket, and preferred the metal case over plastic one.


Going to rewire my pickup truck trailer circuit , this is last piece I needed. This is high quality plug for my r v . Thanks


High quality that should last a long time! My only complaint was that the pin that orients the inner part was hard to get in place.


Bought this after the cover on my plastic one broke in half so it would not hold the plug in. (It was -20° though). Solids well made piece, nothing here will break at -20°. Etrailer was the only place I could find one that is all metal. Placed the order and had it in hand in 3 days. Never let down by Etrailer.



After 1 year its holding up great. No signs of rust either, Minnesota loves salting the h*ll out of the roads in the winter. I did give the inside contacts a good coat of dielectric grease And they are looking god too. Great product.


good product made of steel not plastic,made in tiawan ,better than china,would like one made in USA. maybe etrailer can find more parts made in USA i would be willing to pay more.its time to take back our country,the USA.



good so far i need to find a steel plug for the trailer now.

Etrailer Expert

Rachael H.


Thanks for the feedback, happy to hear you are pleased with your vehicle connection. If you need the trailer plug, that is available as Part # PK12702. It is linked above as a related part.


Product is much better than the plastic version. The receptacle has a very strong spring on the lid and a hook to lock the trailer plug into it.
The plug is galvanized and not stainless how ever, so it will corrode and rust in the Wisconsin rust belt eventually. After 1 year how ever it is fine.
I bought the metal version for out custom work trucks that I build for our company. The protective lids on the plastic ones were getting broken. The metal plug is more durable and has solved that issue.


Very heavy duty connector, metal body, brass terminals, metal locking pin. We use them for construction work all day long. They will take the abuse the workers put them through.


I am very grateful to etrailer for always providing excellent service. Orders are received in a timely and accurate fashion. The quality of their products is superb. All items ordered function as described with no malfunctions. The trailer and vehicle wiring connectors I have ordered were a great replacement for old existing equipment that was constantly failing.
Very professional company. Very high quality products. I look forward to continued business with them.


Easy to install and works great. Can always rely on etrailer for great parts, fast shipping, and the best price around.



Everything seems to be working well.


Still very happy with this unit I sold that truck But remove the trailer plug from It & reinstalled it on my replacement truck & still use it,
this was worth the effort.


Heavy duty metal not plastic


As advertised and great customer service. Highly recommended. A++++


Good quality product. MUCH BETTER THAN THE BLACK PLASTIC VERSION of this item.
I mounted this under the back bumper of my SUV so that it is inconspicuous from view.


After being unhappy with plastic connectors I picked one of these up and it seems to fix all my problems with covers breaking off.


JENA D i've used these plug ins for my shear that attaches to my skid loader. Were in the iron and steel business, my wife irons and i steel. I've used these plug ins for about 19 years now and have had real good luck with them.YOU got the order right and they arrived on time who do i talk to about getting YOU a raise. Thanks again Donnie


Good quality, excellent product.
only thing they missed IMHO is to put a rubber gasket to the cap.


Everything arrived as expected and all fit perfectly!! This is not my first purchase from etrailer, and as before, shipping was timely and all components were as they advertised them to be. I will not hesitate to order again when I need something they offer.


In use for 6 months now. So far so good!


Used in mixed fleet applications. Reliable quality with easy installation. Metal construction seems to provide more service life.


great product super durable can't go by the colors on the back of the connector though


Works great, Very easy to install. The rubber plug in the back is the only difficult part to deal with. I Place a dab of silicone around it to make a better water proof fit.


After having to replace numerous plastic sockets over the years I have finally found a robust alternative. Sturdy and well made. Not the cheap articles found in most places. Installed and used already they are not as bulky looking as the cheaper models so they don't protrude out but hug to the bumper. The salesman was very helpful and professional. Answering questions I posed to him.
Will purchase from them again.


Great product that is still in great shape despite riding underneath my off road vehicle on some seriously tough trails throughout the 4 Corners.


This looks pretty good, again I haven't had a chance to install it yet, but I'm sure it'll work fine. Maybe I'll report back once I have it installed and working.

Paul M.


Worked perfectly! The one on our 23 year old rig was looking a bit worn so it made sense to replace it as this was our first attempt at towing. Again, good quality and so far its still working!

Show More Reviews

See what our Experts say about this Pollak Trailer Wiring

  • Troubleshooting Running Lights Not Working on Trailer
    You did not specify what vehicle you have but many will have a fuse specifically for those lights so if you take a look at your owner's manual it should specify which fuse you need to replace as well as its location. Additionally you may have an overload if your running lights are incandescent or there is a short that is causing the overdraw so you will want to check the maximum amps your harness can handle and make sure the lights aren't drawing more than that. I have also added links...
    view full answer...
  • Troubleshooting Trailer Blinkers Where When One is Activated the Other Blinks Dimly
    We had this exact same problem in our shop the other day and the problem turned out to be that the grounds of the trailer light assemblies weren't sufficient. By grounding the light assemblies better the problem went away. You can also check to make sure that the main ground strap from the trailer connector that runs to the trailer frame is connected properly. If that does not fix the problem you can run the grounds from the assemblies straight to the main ground wire of the trailer connector....
    view full answer...
  • How Do Trailers Maintain Ground Connection from Tow Vehicle
    A trailer will use the vehicle's ground on the 7-way (or 4-pole), usually carried on the white wire, for its lights, brakes, etc. As you look at the vehicle 7-way socket (please see the linked photo) the ground is usually carried on the pin at the 7-o-clock position. It should not be necessary to make any ground connection to the hitch itself. In actual use the coupler/hitch ball connection does provide a degree of grounding for the trailer, but this will not be enough for all of the lights,...
    view full answer...
    Image 1 for
  • Troubleshooting No Power to 7 Pin Connector on a 1998 Chevrolet C/K Series Pickup
    It sounds like you have a fault in the wiring between your fuse box and the 7-pin connector, a bad connection, or a bad connector. You should check the wiring at your connector first to make sure there is no corrosion or damage. If there isn't I recommend tracing the wires to the connector to see if there is any damage. If there isn't a problem with your wiring then you should replace your connector. The Pollak Metal 7-Pole, RV-Style Trailer Socket - Vehicle End item # PK12703 you were...
    view full answer...
  • Troubleshooting and Repairing Weak Ground Connection on Trailer
    So everything is operating normally until you turn on the headlights, right? This is a classic case of a poor ground connection. Things will work fine until the running lamps are activated, which pulls more amps through the system. If there's a problem, that's when it'll show up. Make sure the trailer connector on the tow vehicle is properly grounded to the vehicle frame or chassis and that the connection isn't corroded. From the trailer connector on the trailer, trace the white ground...
    view full answer...
  • Troubleshooting Trailer Wiring that Shorts Out Truck's Trailer Running Light Circuit
    Since the trailer running lights fuse is blowing on your truck when plugged into your trailer and the wiring at the junction box looks clean as well as the pins of the connector being clean I would recommend going over the wiring of that circuit from the box back to the taillight assemblies. Most likely you'll find a portion of the wiring that is cut with exposed wire that is touching the metal frame of the trailer which is causing the short. I also attached a help article on troubleshooting...
    view full answer...
  • Troubleshooting Parking Light Error Code on Vehicle Dash When Brakes are Applied
    Without knowing more info I'd first check to see if you have any corrosion on your trailer wiring connector. Sometimes a low draw on trailer wiring can cause a vehicle to think that there is a light bulb out. Corrosion can put a light draw on trailer wiring circuits too.
    view full answer...
  • On Trailer Light Circuits is Parking Lights and Running Lights the Same Thing
    Yes, trailer running lights and parking lights are the same circuit. So on a vehicle when you turn the headlights on there's the position on the selector right before you get to the headlights where all of the exterior lights of the vehicle come on without the headlights...that's what the running light circuit of trailer wiring is referring to.
    view full answer...
  • What Connections Need to be Made for a 2009 Chevy Silverado to Complete the 7-way Wiring
    There are two wires that will need to be connected under the hood of your 2009 Chevy Silverado before the 7-way will be fully functional. Check out the FAQ article I attached that shows how this is done. If you have already done this and you still are having an issue with the truck not having voltage mid-truck then you will need to trace the wiring back to find where the voltage stops and fix as necessary.
    view full answer...
  • Troubleshooting 2002 Chevy Silverado Trailer Running Lights Not working
    Since your tester works for your running lights and your trailer works, you can determine the issue is the connection between the two. The adapter doesn't seem to be the issue as you have the other functions, which leads me to believe the issue is with your trailer ground wire or a ground wire on your truck side. Sometimes a bad ground will allow function with another vehicle that may have a stronger output so it could be your trailer side, but if you tested your truck and are only...
    view full answer...
  • How to Activate Brake Controller and 12V Power Circuits in 7-Way Connector on 2005 Silverado
    On the 7-way trailer socket on your 2005 Chevy/GMC pickup certain circuits such as the 12V trailer power feed and the brake controller output will not be active on the 7-way until you make connections at the power box under the hood. You can refer to the linked article which details the process of making those connections. Photos are included to show you where to find the red and blue wires. You will also need to install fuses to activate those newly-wired circuits. This too is covered...
    view full answer...
  • Diagram to Use for Rewiring 7-Way Trailer Wiring Connector
    So there are two ways that 7-ways are normally wired with the only difference being the colors used. It looks to me like you have RV Standard style wire colors which is the middle diagram on the picture I attached. Your best option is to rewire the connector to match it and you should see it all start to work again.
    view full answer...
    Image 1 for Image 2 for
  • Troubleshooting 2015 Dodge Ram 1500 that Says Trailer Connected All the Time
    The issue you are more than likely having is that you have some corrosion on the pins of your trailer wiring connector which is tricking the computer of your truck into thinking you have a trailer connected as it's sensing a slightly draw similar to brake magnets or trailer lights. The really easy fix is to take some sandpaper to the pins of the 7-way to clean them all off and the issue will go away.
    view full answer...
  • Brake Controller On 2002 Chevy Silverado 2500 Works With Override But Not Brake Pedal
    It sounds like you are having issues with brake output pin inside the trailer connector on your 2002 Chevrolet Silverado 2500. If you are getting 12 volts on the brake output wire directly after this with the override but not the brake pedal then the issue is most likely the notorious blown CHMSL fuse which is located in the interior fuse box I believe. Please let me if the fuse is still good and this does not fix your issue.
    view full answer...
  • Troubleshooting Trailer Running Light Circuit of 2015 Chevy Equinox Not Active
    Typically when the running light circuit of a vehicle appears to be dead it's just corrosion built up on the pins of the trailer wiring connectors of the associated circuit. What you'd want to do is first try cleaning all of the pins and then making sure they are bent as well. I attached a help article with more info on troubleshooting trailer wiring for you to check out as well.
    view full answer...
  • Wiring of Pollak Metal 7-Pole, RV-Style Trailer Socket
    None of those are the ground wire on the Pollak Metal 7-Pole, RV-Style Trailer Socket # PK12703, it will be the white wire. Here are the wiring color configurations for this socket: White - Ground - 10 gauge Blue - Electric Brake - 12 gauge Green - Tail, License and Running Lights - 14 gauge Black - Battery Charge - 10 gauge Red - Stop and Left-Hand Turn Signal - 14 gauge Brown - Stop and Right-Hand Turn Signal - 14 gauge Yellow - Auxiliary Circuit - 14 gauge
    view full answer...
  • Wiring Diagram for the Pollak Metal 7-Pole RV-Style Trailer Socket Part # PK12703
    I have attached the wiring diagram of the Pollak Metal 7-Pole RV-Style Trailer Socket part # PK12703 for you. Please keep in mind that the diagram follows an RV standard configuration which will need to match what is on your trailer.
    view full answer...
    Image 1 for
  • Why Would 7-Way Trailer Wiring Have Purple or Yellow Wire for Center Pin
    There are two different ways that 7-ways get wired based on the color of the wires. (The function is the same). One of the differences is the reverse light circuit color which can be yellow or purple. Since you have yellow instead of purple it would run to the center. You have the RV standard style of connector like in the middle of the diagram I attached.
    view full answer...
    Image 1 for
  • Is Arc Normal When Running Jumper Wire to Brake Output Circuit of Trailer Wiring
    If you are seeing an arc or spark when running a 12 volt wire to your brake output circuit that would indicate that the circuit is shorted to ground and would be reason it's not working. You'd need to go over the circuit looking for any cut or exposed wire and fix as needed.
    view full answer...
  • Troubleshooting Voltage Drop When Trailer Running Light Circuit is Connected
    The running light circuit of your trailer wiring is definitely shorting to ground which is causing the problem you are having. You'd need to go over the wiring of that circuit and fix any cut or exposed wire as needed.
    view full answer...
  • Which Fuse Provides 12-Volts to 7-Way Connector on 2009 Chevy Silverado 3500 Diesel
    If the 12-volt pin on your trailer connector isn't working, you've got a missing or blown fuse or the wiring connection at the fuse box under the hood wasn't finalized. You're looking for a 40 amp fuse, located in position # 68 in the fuse box under the hood. The fuse protects one of the nearby power studs on the side of the fuse box, which is where the wire that provides power to the 7-way should be connected. If it's not, you can find the wire bundled up under the master cylinder (see...
    view full answer...
    Image 1 for
  • 12V Power Consumption On A Trailer Connector Using A RV Style Trailer Socket
    When using The Pollak Metal 7-Pole, RV-Style Trailer Socket - Vehicle End # PK12703 the socket is switch on by ignition switch. If the battery is not on then it will be getting no power. The wiring configuration is below: White - Ground - 10 gauge Blue - Electric Brake - 12 gauge Green - Tail, License and Running Lights - 14 gauge Black - Battery Charge - 10 gauge Red - Stop and Left-Hand Turn Signal - 14 gauge Brown - Stop and Right-Hand Turn Signal - 14 gauge Yellow - Auxiliary Circuit...
    view full answer...
  • Troubleshooting Trailer Marker Lights that Stopped Working After Intermittently Flickering
    Standard trailer wiring would have clearance or marker lights on the same circuit regardless of the color of the lens. The running light circuit would be controlling them. Most likely the lights have a weak ground as you said they flickered and then stopped working. I'd check to make sure they are grounded to a clean metal surface. You should also note that a lot of trailer wiring grounds through mounting hardware so you'd need to make sure the mounting hardware is clean and free of rust/dirt....
    view full answer...
  • How To Wire the Pollak Metal 7-Pole, RV-Style Trailer Socket
    In regards to installing the Pollak Metal 7-Pole, RV-Style Trailer Socket part # PK12703, the colors mentioned are just a reference and you should use the actual pin locations for proper installation. I have attached a link below with these correct locations. The yellow wire is mostly used for the left stop/turn signal circuit so in which case it would need to be installed on the pin in the 9 o'clock position (facing forward).
    view full answer...

< Previous
123. . .13

Do you have a question about this Trailer Wiring?

Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Patrick B
Expert Research:
Patrick B
Employee Michael H
Expert Research:
Michael H
Employee Jeff D
Expert Research:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee John H
Expert Research:
John H
Employee Adam R
Expert Research:
Adam R
Employee Rachael H
Expert Research:
Rachael H
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Victoria B
Expert Research:
Victoria B
Employee Tyler C
Written by:
Tyler C
Employee Cole B
Installed by:
Cole B

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.

Product Experts Available Now!
Call 1-800-940-8924