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Pollak

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

Part Number: PK12-724

195 Reviews | 13 Questions

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$31.21

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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. 1-800-940-8924 to order Pollak custom fit vehicle wiring part number PK12-724 or order online at etrailer.com. Free expert support on all Pollak products. Great prices and Fastest Shipping for Pollak Trailer Connector Adapter - Vehicle End - 7-Pole Round to 7-Way Blade. Custom Fit Vehicle Wiring reviews from real customers.

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Reviews (195)
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Pollak Custom Fit Vehicle Wiring - PK12-724

Features:

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

Specs:

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.

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

Replaces Pollak 12-724EP

Similar to Hopkins HM47425

Customer Satisfaction Score:

99% were satisfied with this product

1% of customers were not satisfied

etrailer mistake
Wrong item was ordered

1% of customers were not satisfied

etrailer mistake
Wrong item was ordered

4.7

195 reviews

5 Stars		(159)
4 Stars		(21)
3 Stars		(9)
2 Stars		(2)
1 Star		(4)

by: Elmer Platz 08/19/2019 One Year Later

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.

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by: Thomas 01/13/2026

Customer service was great and the adapter works as advertised, happy customer!

by: Jim 10/08/2025

Looks to be what I need to connect my 7 pole round on a KW W900 to a trailer I use with various vehicles that has a RV plug installed on it. Now should have another option depending on the load and that is good.

by: Eric 08/14/2026

Doing the job.

by: NorCalBruce 06/02/2017

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.

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by: Edward 05/17/2026

Worked as advertised

by: Charles 06/01/2018 One Year Later

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.

Rachael H.

6/23/2018

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.

Helpful Links

faq-wiring.aspx

by: Eddie 02/21/2013

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.

Eddie

2/27/2014

I still like it fine but I dont use it much.

by: Mike 01/06/2026

I was going to make my own, but this is exactly what I needed. And it got to me fast. Great company.

by: Tim R. 07/12/2020 One Year Later

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

by: Mary T 10/10/2017

We are so glad we found etrailer.com! 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.

by: Brad 04/27/2021 One Year Later

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.

by: WM 01/10/2017 One Year Later

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.

by: Michael 04/22/2020

This is a well made item and it worked perfectly on my 1933 ford truck !

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by: Carl 10/05/2015

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!

by: Alex 04/10/2019 One Year Later

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.

by: Austin R. 12/22/2014

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.

by: Billy 06/07/2021

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.

by: Duane 07/28/2018

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! Etrailer.com has fast order processing too. Very satisfied with the product, price & service!

by: Tracy 09/20/2022

It worked as expected but he male round plug bottomed out in my tractor and would not engage the latch on the lid to hold it in. Had to sip tie it in place. I have other 7 pin round plugs which work fine but this one seems longer than the others.

by: Marco 04/23/2017

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

by: Harrison S. 08/08/2014

This is awesome!! You can't buy the raw parts for what you can buy this adapter for. With my semi truck I can easily supply trailer lights to RV travel trailers and utility trailers. I wish I had know this product existed. I'll be buying several more!

by: Drew W. 10/01/2016

This is a waste of money. The way the 7 pin plug is wired is not compatible with the 7 blade plug. There was also a wire loose in the plug so I had to take it apart and fix it.

by: D J 05/05/2015

Excellent quality adapter- now can use my 1992 F 350 to pull trailer with 7 blade without rewiring Ford factory receiver 7 pole Extremely pleased. Now both my Ford F 350 can pull cattle trailer.- nice to have back up available.

by: David 07/21/2020

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.

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See what our Experts say about this Pollak Custom Fit Vehicle Wiring

Do you have a question about this Custom Fit Vehicle Wiring?

How To Prevent Backfeed On Tail Light Wiring When Using Hopkins 7 Way Round Pin To 7 Way Flat Pin
Hey Ron, what made you decide to install that converter? The reason I ask is that a converter like the Hopkins 48845 is normally only needed when the tow vehicle has separate brake and turn signal wires, and the trailer uses combined brake/turn circuits. The converter takes those separate brake and turn signals and combines them so the trailer lights work correctly. In this case, both the 7-way round pin and 7-way flat blade connectors should already be using combined stop/turn circuits...
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Looking for 7-Way Round to 7-Way Blade Adapter
Hey Richard, we do have the adapter you are looking for with the part # PK12-724. This will convert your 7-way round to be the blade style. What are you towing?
view full answer...
How to Use the Custer Lite-It Wireless LED Agricultural Tow Lights on a 7-Way Round Tractor Plug
Hey Edward. To use the Custer Lite-It Wireless LED Agricultural Tow Lights item # LIW-AGKIT-SG on your tractor you'll also need the Pollak Trailer Connector Adapter item # PK12-724. This will adapter the 7-way round plug on your track to work with the 7-way RV connector that comes with the item # LIW-AGKIT-SG. What kind of tractor do you have?
view full answer...
Troubleshooting Pollak Trailer Connector Adapter Not Working With Kioti DK5010 Tractor
Hi Forrest; because of the way an agricultural 7-way is wired the # PK12-724 is not a good solution. The best thing you can do is run a 7-way blade and connect straight to the trailer. Right now you don't have a brake output pin and it sounds like 12V power is carrying over so the brakes are constantly activated. Also, your tractor will have separate brake light and turn signals which won't work with the Big Tex trailer. To accomplish this you can use the # 337TC1474P along with the #...
view full answer...
Do You Have a 7-Pole Round to 7-Way Blade Adapter
Hey, Brian! We do have just the adapter for you! We have the Pollak trailer connector adapter part # PK12-724. This adapter adapts 7-round pin to 7-way blade trailer connector seamlessly. I'll also include the other Pollak adapter part # PK12728. It's pinned the opposite of the first adapter. I wanted to mention it just in case I misunderstood how your pins were on your semi. Figured better safe than sorry.
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Is There an Adapter For 7-Round on Vehicle to 7-Blade on Trailer
Hi Jim, While we do have an adapter for the 7-round on your Ford that will connect to the standard 7-way on your trailer, though not one that is coil type or 3 feet long. The longest one we have is 14-1/2", the Pollak Trailer Connector Adapter - Vehicle End - 7-Pole Round to 7-Way Blade # PK12-724.
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How Can I Get Gooseneck Trailer With 7-Blade To Work With Motorhome With 7-Way Round Connector?
Hey Bryce, thanks for reaching out. It sounds like the 7-round on your gooseneck trailer may not be wired correctly. Have you tried taking a wire tester or multimeter and checking all the wires? If the trailer plug is not pinned correctly to match the RV it would definitely explain the issue you are describing. Or, if you are sure the 7-blade connector on your gooseneck trailer is wired correctly, you could use the adapter # PK12-724 to bring them together. The adapter really should not...
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Can Prodigy RF Trailer Brake Controller Fit with 7-Pin Round Connectors
Hey Matthew! We have an adapter like the Pollak # PK12-724 that's designed to change a 7-Pole Round to a 7-Way Blade style to match what the Prodigy RF # TK94FR has, and then you'd need to use the opposite adapter, part # PK12727, to get it back to matching your trailer. You might consider cutting off your current connectors and replacing them with parts # PK12-707E and # PK12706 to match the RF and industry 7-Way standard plugs, but I do understand the hesitancy in doing this since it...
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Best Way To Connect
Hello Bill. I do have a solution for you, but the 4-pin round plug is not common, and we do not have an adapter for a 4-pin male to a 7-way female. What I would do it wire the flatbed tow truck with the more standard 4-flat plug like part # HM48205. This will allow you to use the adapter # 30717 which will allow you to plug in your 7-way trailer plug. Keep in mind that this will only operate the brake lights and turn signals and there will be no braking capability.
view full answer...
Is The 7-Way to 7-Way Trailer Connector Extension From Truck to Trailer
Hey Aaron, We do have an extension for you to go from your truck's 7-way to your trailer's, but the # PK12-724 isn't one of them. This is actually an adapter to go from a 7-way round pin to a 7-way blade, so it isn't an extension. But thankfully, we have exactly what you need, which is the following: - TorkLift Wiring Harness Extension # TLW6024 This will give you a 24 inch extension and yes, it will work just like the factory set up so you're good to go.
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7-Way Adapter to Use with Pollak Trailer Connector Adapter part # PK12-724
Yes we can confirm that the Pollak Trailer Connector Adapter part # PK12-724 is the correct 7-way adapter you need for your John Deere 5205 based on the pictures you submitted.
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Availability of 7-Pole Round to 7-Way Blade Adapter for Semi Towing Big Tex Trailer
Hi Jason; none of the adapters like the Pollak Trailer Connector Adapter - Vehicle End - 7-Pole Round to 7-Way Blade # PK12-724 have a built in converter. You will have to wire in your own converter like the # RM-732 to complete your setup with the Big Tex trailer. If you wanted to build your own and wire that into the actual adapter you could use # PK11893 with # PK11700 along with # DW04914-1 for your wiring. What are you hauling on your trailer?
view full answer...
Need Adapter For Vehicle With A 7-Pin Round Plug And A Trailer With A Standard 7-Way
Hey Tim, thanks for the pictures. We have exactly what you need. I recommend the Pollak Trailer Connector Adapter # PK12-724. This will plug in to the 7 round pin male plug on your vehicle and allow you to plug the 7-flat female trailer plug into the other end. You may want to use a bracket like part # PK12711U to mount the plug.
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