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

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

Item # PK12703
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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. Lowest 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.
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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 Reviews

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

Average Customer Rating:  4.8 out of 5 stars   (66 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.


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.


Does what it is supposed to do.


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.
bruce - 07/23/2014

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
Pollak Metal 7-Pole, RV-Style Trailer Connector - Trailer End
. It is linked above as a related part.

-- Etrailer Expert Rachael H - 7/24/2014


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.
Steven - 02/07/2020


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.


Just what I needed . Super fast shipping and excellent product .


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


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.


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.
Patrick - 04/01/2019


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.


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.


Far better than the plastic stuff!


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


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.


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.


Good Strong Product at a good price


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


Great RV receptacle. I prefer metal housings like this as opposed to plastics that can break at low temps. They shipped promptly as promised. Thanks eTrailer!


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


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


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.

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!
Paul M - 05/31/2020


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


Extremely easy ordering process. Great product, we have re-ordered many times. Received follow up email making sure we received product. Have not had any issues but I feel if we needed anything they would help right away.

Show More Reviews

Ask the Experts about this Pollak Trailer Wiring

  • Wire Functions/Locations for a Trailer Side 6-Way Connector
    GD is ground LT is left turn/brake lights RT is right turn/brake lights TM is tail lights AS is likely auxiliary 12 volt power which was probably used to run the pump I have also included a picture that shows the basic layout of a 6-Way connector, trailer side. Please note that in some situations the brake and 12 volt power circuits are switched.
    view full answer...
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  • Troubleshooting Trailer Brakes that Lock Up When Vehicle Brakes Are Touched
    Sounds like one of the stop/turn signal circuits is shorting out to the brake output circuit which is causing 12 volts to apply to your trailer brakes when the brake lights illuminate. To narrow down which blinker circuit is at fault apply each of the blinkers and the brakes will start pulsating with the blinker that carries the circuit with the short. You would need to go over the wiring on your truck and trailer to find the cut or exposed wire and fix as needed. Corrosion can also cause...
    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...
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  • Why Would Stoplight Circuit Wire on 2010 Chevy Silverado for Brake Controller Not have Voltage
    Under the dash of your 2010 Chevy Silverado the wire that would have the brake signal for the red wire of a brake controller would be either light blue or orange in color. If the wire you have found is dark blue it would be for the blue wire of the controller and would not ever see voltage unless wired to a brake controller. If the wire you have found is the correct stoplight circuit wire you would need to check the CHMSL fuse as that would be the most likely blown one. I attached a help...
    view full answer...
  • Troubleshooting 6-Way Trailer Wiring Where Trailer Brakes Lock Up when Trailer is Plugged in
    For your trailer with a 6-way there are actually two common ways the 6-ways can get wired up. The only difference is that the brake output circuit and the 12 volt circuit are swapped. Since your brakes are locked up currently all you need to do is swap those two circuits and the wiring should be correct. What that means is swap the circuit in the 2:00 and center position. That will fix your problem. We see this issue pretty regularly and the solution is always just swapping the two circuits....
    view full answer...
  • Troubleshooting Brake Controller that Stopped working with Brake Pedal on Chevy Silverado
    The problem is the red wire of your brake controller. It isn't connected to a circuit that sees 12 volts of power when the brakes are applied. Since your truck is a 2009 Chevy Silverado this would mean that the problem is most likely a blown third brake light (CHMSL) fuse. An easy way to test this theory is to check to see if your third brake light is working. If it's not the fuse is the problem.
    view full answer...
  • Troubleshooting GMC Truck Where Trailer Brake Lights Aren't Working
    What you described sounds like a blown third brake light fuse or CHMSL fuse. Check the third brake light of your GMC Sierra and it most likely won't be lighting up with the brakes. This is a very common problem with the GM trucks of around your year.
    view full answer...
  • No Power to Trailer Brakes when Connected to 2003 Ford F-350
    The blue wire on a brake controller is output to the trailer brakes. If that wire is not connected the trailer brakes will not be getting any power. If there is a break in that wire somewhere between the controller and the trailer connector then that could be why it isn't working when the wire is connected. You could bypass it by running your own wire if you wanted to. The ABS system should be separate from the wiring for the brake controller. Usually the only time the ABS comes into play...
    view full answer...
  • Can a Red Wire be a Ground Wire in a 7-Way Trailer Connector
    By process of elimination the red wire must be the ground. But while there are common wire colors used there isn't a standard so the red wire could technically serve any function (except that you noted that everything works). On a 7-Way the only circuit that won't have power at some point would be the ground. So if all the other wires show power when a function is on and that red wire doesn't then it has to be the ground. But it must already be grounded somewhere because if it wasn't...
    view full answer...
  • Which Pin of 7-Way Carries 12 Volt Accessory Circuit
    If you are looking at the 7-way from the front the 12 volt accessory circuit is the circuit in the 1:00 position. I attached a diagram that shows this.
    view full answer...
    Image 1 for
  • Help Finding Brake Controller Wire Under Hood of 2009 GMC Sierra
    The wire you are looking for has most likely fall down far enough between the box and the fender that you can't see it. It is down there and may be under the box almost. No GM truck was made without it so you would just need to keep looking till you see it. If you pull up the loom that is in the black conduit you should see the harness attached to it. I attached a help article that covers this for more info as well.
    view full answer...
  • What Is The Purpose Of 12V Power On Trailer Connector For Fifth Wheel Trailer
    The 12V power pin on the 7-way connector for your fifth wheel is used for maintaining a charge on the trailer battery or auxilliary power. I have attached a helpful article that explains what each of the wires on a trailer connector functions are you can check out.
    view full answer...
  • Wiring Diagram Recommendation for Installing Pollak Metal 7-Pole
    If you check out the picture I attached you will see a diagram to use for wiring up the 7-Way part # PK12703. The pin in the 1:00 position will be the charge circuit that you mentioned.
    view full answer...
    Image 1 for
  • Troubleshooting Brake Controller in 2016 Chevy Silverado that Stopped Working
    You have definitely narrowed the problem down to either the brake controller or the wiring on your 2016 Chevy Silverado. Have you tried using the manual override lever of the controller to see if that puts voltage on the output circuit? Typically when we see this issue it's third brake light fuse of the truck that is blown...especially on GM trucks. Try checking to see if the third brake light illuminates above the truck bed as that's the easiest way to tell if that's the problem. I attached...
    view full answer...
  • Troubleshooting Trailer Lights that Dont Work When Headlights are On
    The problem you are having is a classic ground issue. If the ground wire to the trailer frame or the tail light grounds are not connected securely to clean, rust and paint free surfaces then when the headlights are turned on the extra amperage draw for the running lights will cause all sorts of lighting issues. I would start by removing the ground wire at the trailer coupler and cleaning up the connection point and re-securing it to the trailer frame. Next I would check the ground connection...
    view full answer...
  • Brake Controller Install Recommendation for a 2013 Chevy Silverado
    For your 2013 Chevy Silverado there is brake controller wiring available under the dash. Below the steering column, there is a bundle of wires tied together with white tape, located left of the brake pedal. This bundle of wires is the tow package for the brake controller. Carefully cut the white tape binding the wires, and pull the wires down from underneath the steering column. You will use these wires to wire up the controller. There is a few connections that need to be made under the...
    view full answer...
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  • No Power on Any of the 7-Way Connector Pins on a 2006 GMC Envoy
    There is a fuse in the under hood fuse box on your 2006 GMC Envoy that is probably the one you are looking for. It is in location 32 labeled Trailer. If you find that replacing that fuse does not help then it could be a body control module or one of fuses for it.
    view full answer...
  • 12 Volt Power on the Brake Output Pin All the Time On 7-Way Trailer Connector on 1998 Ford Explorer
    There can be a very small amount of power on the brake output circuit of a 7-Way (5:00 position) which would be the brake controller checking for a trailer, but there should not be 12 volts of power. That indicates a short of some kind or a problem with the brake controller. Since you said you recently added the 7-Way it is possible that inside the connector where the wires attach the 12 volt circuit wire is touching the brake output circuit causing the constant draw. If you address that...
    view full answer...
  • How Does a Trailer Side and Vehicle Side 7-Way Get Wired
    You cannot go by wire color in most cases because there is no real standard. We have blue for trailer brakes, yellow for left turn/brake lights, brown for running lights, green for right turn/brakes, black for 12 volt power, white for ground, and purple for reverse or AUX power at the center. Since your lights are not working something must not be in the right spot. What you can do is touch each wire to the positive terminal of a separate 12 volt battery and see what lights up. Or you...
    view full answer...
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  • Troubleshooting Trailer Running Light Circuits Not Functioning on a 2004 Chevy Silverado 7-Way
    I would start troubleshooting at the connector itself. Take the connection apart and make sure there are no bent pins or corroded terminals that could cause the tail light function not to work. Next, I would check the fuse block under the hood of the truck again. There should be a slot for a tow package fuse in there. Check the legend under the fuse block cover and you may find that this fuse is missing or that it has blown, and needs to be replaced. I know you said you checked there once,...
    view full answer...
  • Replacing the Car End of a 7-Way Metal Trailer Connector
    You can replace just the car end, if the trailer end connector is not broken you do not need to replace it. You will just need to remove the broken connector and attach the wires to their respective pins on the 7-Way Metal Trailer Connector, Car End, item # PK12703. You can use the wiring diagram on our Trailer Wiring Diagrams page see link to wire the connector to your vehicles wiring. When looking at the wiring diagram keep in mind that we are showing the connection points inside the...
    view full answer...
  • Where to Attach Auxillary Power Wire on Vehicle Side 7-Way connector on 2001 Ford F-350
    Yes, you will use the number 4 pin on your 7-way connector, item # PK12703, which may also be labeled Red. The normal attachment is a Black 10 gauge wire to this connection for charging the trailers battery and powering 12 volt accessories.
    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...
  • 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...
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