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Pollak Trailer Connector Adapter - Vehicle End - 7-Pole Round to 7-Way Blade

Pollak Trailer Connector Adapter - Vehicle End - 7-Pole Round to 7-Way Blade

Item # PK12-724
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This adapter plugs into your vehicle's 7-way, round-pin receptacle to adapt it for use with a trailer-end, 7-way, RV-style plug. The 7-way flat receptacle includes a hinged cover to keep dirt and moisture out of the connection. Lowest Prices for the best trailer wiring from Pollak. Pollak Trailer Connector Adapter - Vehicle End - 7-Pole Round to 7-Way Blade part number PK12-724 can be ordered online at or call 800-298-1624 for expert service.
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  • Reviews (134)
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Pollak Trailer Wiring - PK12-724

  • Wiring Adapters
  • Single-Function Adapter
  • 7 Round - Blade
  • Plug and Lead
  • 7 Round - Round
  • Pollak

This adapter plugs into your vehicle's 7-way, round-pin receptacle to adapt it for use with a trailer-end, 7-way, RV-style plug. The 7-way flat receptacle includes a hinged cover to keep dirt and moisture out of the connection.


  • Adapter converts your 7-way, round-pin vehicle-end connector for use with a 7-way, RV-style trailer-end connector
    • Lets you tow a trailer with a 7-way blade plug
    • Works with any RV-style, 7-way plug
    • Connects ground, left turn, right turn and stop circuits
  • Round, floating, solid brass pins in plug
    • Ensure minimum voltage drop
    • Align easily for maximum contact
  • Spring-loaded, hinged door on socket to protect the interior from dirt and moisture
  • Collar with 4 mounting holes lets you mount the socket to your bumper
  • Plug is constructed of glass-filled nylon
  • Socket is constructed of high-impact, ABS thermoplastic


  • Overall length: 14-1/2"
  • Length between plug and socket: 7-1/2"
  • Wire configuration:
    • White: ground return
    • Black: clearance, side marker and identification lights
    • Yellow: left turn signal and hazard signal
    • Red: stop lights and anti-lock devices
    • Green: right turn signal and hazard lights
    • Brown: tail light, rear clearance marker and license plate light
    • Blue: auxiliary circuit/ABS power
  • Wire gauge:
    • White: 8
    • Red, blue: 10
    • Black, yellow, green, brown: 12
  • 1-Year limited warranty

Note: If your 7-round plug is wired separately (brake light and turn signals on different wires), this adapter won't work.

12-724EP Pollak Trailer Connector Adapter - Vehicle End - 7-Pole Round to 7-Way Blade

Customer Reviews

Pollak Trailer Connector Adapter - Vehicle End - 7-Pole Round to 7-Way Blade - PK12-724

Average Customer Rating:  4.8 out of 5 stars   (134 Customer Reviews)

This adapter plugs into your vehicle's 7-way, round-pin receptacle to adapt it for use with a trailer-end, 7-way, RV-style plug. The 7-way flat receptacle includes a hinged cover to keep dirt and moisture out of the connection.

- PK12-724

I received this item in a plastic bag, for a few moments i wondered if it was a knock-off. I had done my home work and was sure that this item would be compatible with the socket on my John Deere 2013 5085M at the time I ordered it, not so. The 'holding ridge' at the plug-in end was not in the right position when fully inserted into the plug on the tractor. I sent multiple pictures to Pollack Technical Support but they were unable to assist me. I finally modified the item myself (something I really hate to do) so that it would fit the plug-in and be 'grasped' by the cover/holder on the tractor side. As I anticipated, the thickness of the plastic was inadequate to make the adaptation 'sweet', so I had to cover the resulting hole with silicone caulk.

- PK12-724

Well I was hoping that the product was gonna take my 7 pin round 3 wire system on my truck and turn it into a 7 blade round 2 wire system for my trailer. But it doesn't Convert my system from a 3 wire to a 2 wire. But it does go from a 7 pin round to a 7 blade round.. So Ive ordered the converter to fix my problem.

- PK12-724

My trailer connector works great. Because I live a ways from town it was great to order it online and have it shipped. It arrived quickly. One note: When I was in town I did see the same connector at NAPA for the same price. All things considered, I'm happy with my purchase and would order from etrailer again.

- PK12-724

This is a great solution for adapting RV blade connector to 6 pole connector. I give it 5 stars. I use this for work purposes, and have found one issue that I DON'T believe to be manufacturer defect. In my industry we use different trucks and trailers daily, if not hourly. Some trailer electric brakes will lock up when adapter is connected. I have found the red wire in the adapter to be the problem. My solution was to splice in a switch so that when the intermittent problem arises I can flip the switch and be on my way.

Thanks for the information Charles, I did want to let you know that there are two differnet wiring configurations for these 6-way connectors. Sometimes the red wire that you noted as the brake connector point can also be pinned as the 12V power wire. This would then activate the brakes, as you noticed. Your solution while it worked for your application is not something that we generally recommend for our customer in case they forget to flip the switch and are then towing without brakes on their trailer. For that instance we recommend repinning the connector and changing the 12V and Brake pins to correspond to the correct functions.
-- Etrailer Expert Rachael H - 06/23/2018

- PK12-724

Works as described, serves it's purpose.

- PK12-724

It’s a great product but not for my intended reason. It just adapts round pin to flat pin. I was looking for an adapter from commercial truck to RV trailer. Additional wiring is required to convert commercial to RV, gooseneck, etc.

- PK12-724

Have a '79 Dodge with the older style 7 round pin Pollack connector and bought a new camp trailer with the 7 pin spade connector...needed an adaptor. Their PK12-724 was the perfect fit! Well built, and works perfectly! has fast order processing too. Very satisfied with the product, price & service!

- PK12-724

Got it just when it said it would be here. The 7 into 7 plug that was ordered is already on the truck an trailer. Thanks Guys.

- PK12-724

Adapter is, as described. Fits and works perfectly. This adapter allows our dump trucks to hook up to our smaller trailer harnesses. We recommend this product, for this application.

- PK12-724

This item is high quality but the real "value" here is the outstanding customer service that etrailer provided. The 7 pin round plug provided didn't fit my 7 pin round socket and they went out of the way to research the difference in my socket and their plug. Great company.

I still like it fine but I dont use it much.
-- comment by: Eddie - 02/27/2014

- PK12-724

Exactly what I needed to hook a conventional trailer to our new bucket truck without cutting the wiring up to get rid of the rare 7 pin socket.

- PK12-724

seemed to be a good product , the only problem was going from 7 pin round semi connector to 7 pin rv style the trailer brake circuit did not line up , some rewiring was required so it would work with the brake controller ( if i would have i checked your website i would have known it sooner , no problem figured it out ) used truck and trailer alot since , no problems so far

- PK12-724

Fit like it should but I have to run wires down to see how previous owner wired it as they hooked into factory plug and ran another horse trailer like plug on bumper.

- PK12-724

Rather a difficult set up to find. Tried calling several other vendors, and most weren't able to fully comprehend what it was I needed. Called etrailer and not only were they able to know what I was talking about, they had it in stock and I had it in my hands within two days. Personnel are always superior in every aspect of customer service and basic human interactions. Which has become far less of a normal occurrence in this world. I will continue to use etrailer and spread the word on their great performance and excellent product lines.

- PK12-724

I bought this to connect my John Deere 5085 Tractor (7 pin) to a PJ dump trailer (7 blade) and it works perfectly. I highly recommend this as it works and the Hopkins version did not for this application.

- PK12-724

Great Harness worked great on my old factory 1992 Ford F-350 trailer harness.

- PK12-724

We are so glad we found! We have never ordered an incorrect part because their info - and large bank of Q&As - has always told us everything we needed to know. I wanted to share our experience with the Pollack 7-way blade to 7-way round connector, part PK12-724. When researching for the correct part, we found a question from a buyer who had the same/similar vehicle, a 1993 Ford F-150 with a factory tow package. He was told to buy the PK12-724 but to cut the red and blue wires and cross-connect them. (This was info we we so glad to have!) We did so, and most everything worked except the trailer back-up lights came on whenever the lights were turned on. We mentioned it at the RV place when we were there, and they checked it for us. Turns out that not only did we have that issue, but our trailer battery was not charging when hooked up and truck running. So on the blade end of the connector, they moved some of the wires around (see included illustration), and voila, everything now works correctly! I hope this is helpful to others. I believe the truck information is the most important info for this fix, but FYI our Trailer is a 1994 Komfort 27.

- PK12-724

Seems like it should work OK.

- PK12-724

Works I need this to go from my John Deere tractor to my dump trailer

- PK12-724

very satisfied, not only with the items i bought but also etrailer, very easy to order, cant beleve how fast i goy it plus they even sent a followup email. GREAT COMPANY TO BUY FROM

- PK12-724

This adapter saved me a ton of headaches and time! I have a 1986 GMC K3500 that I tow with. I had an out of town event and a borrowed trailer I would be using. This adapter allowed me to just plug and go using my existing wiring set up. It performed flawlessly! I especially liked the built in tabs that lock in using the existing spring loaded cover to secure the plug in place. No worrying about the plug loosening up during the trip. The story would not be complete if I did not also mention the great customer service that helped me get this adapter when I needed it!

- PK12-724

The adapter harness eliminated time & grief to replace/re-wire the commercial style plug on a farm tractor, allowing use of tail, turn, and brake lights on trailers with blade type connector. Works great.

- PK12-724

Product was exactly as described, and fit the unique need to convert the 7 pole to 7 blade trailer light system. This saved rewiring the vehicle and/or trailer.

- PK12-724

All of our trucks come wired with round pole trailer plug and some of our trailers take 7 spade style this adapter solves our problem and is cheaper than buying the parts and making them our selves.

- PK12-724

The 14 inch extension 7 prong pigtail arrived very quickly as described. This is going to work perfect as I need the power cord from the trailer to the truck to be less than a foot longer to make the connection. Thanks for the really quick delivery on the perfect fix!! It appears to be very well built. Marco

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