Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector

by: Philip06/20/2018

Now I've had it for a year and it still works as expected. I'm very happy with etrailer with everything from researching what to buy to product quality and getting followup questions. I couldn't ask for better service. 524325

Was exactly what they said it was & it works great. I highly recommend them. 208488

Its a very good product

Dave R - 07/27/2016

etrailers is my go-to site for anything trailer related. Once again the part is perfect, pricing and delivery excellent. This part went on a 1991 Range Rover to connect to a rather battered PJ flatbed for a one time tow. Worked great! Thanks! 443606

I haven’t had an opportunity to use it, but it is good to have it available. Thanks for the follow-up!

Cate R - 10/18/2018

Has been working great since purchased and installed 3 months ago. Used for several different trailers and long distance trips. Easy to install. Had to be slightly creative with the attachment of the ground. Did not see a reason to have a ground on this portion since everything else is already grounded, however would not work without grounding to the frame. Only used the four way connection and taped remaining three back. Hope for good things to come with this produce. Highly recommend this product. 93648

After hours of trying to get this to work ( since I had gone threw the whole trailer and new truck wiring). I called a guy we know that works for the DOT field crew as an electrician. He took a meter to the system to find out in making the harness the ground was broken in the sheathing. He was able to cut repair and connect the wires so it worked great. This should of been checked before shipping. Cost me money for him to repair. I know this is a one in a thousand weird happening but shouldn't of left the warehouse to me. 473875

I was surprised how fast the shipping was and the price for the product was very reasonable. I did not mind that there was no mounting plate for the adapter because I wanted something that would hook up to the camper when I need to use it and then take it off afterwards. I know I will be coming to etrailer for any other trailer or camper needs that may come up. 193891

could not be happier with the purchase that I made

Al N - 05/26/2016

You would think anyone dealing with trailer hitches and trailer wiring parts would stock this 4 pin to a 7 pin connector. I got tired of looking locally and ordered this connector on line through etrailer. My little trailer does not have trailer brakes and I can now use my 7 pin connector installed on my truck or use the 4 pin set-up with my car. What a great universal connector without having to rewire your vehicle or trailer. I would recommend this connector to anyone pulling a trailer, thanks etrailer. 347065

Connected existing 4 pole from van to seven pole on my pop up camper. 90538

Still happy with the connector. Traveled from Buffalo to Mt Rushmore then St.Louis and back this past summer. No problems.

Tim - 01/17/2015

There was no splicing wires, it was plug-and-play, highly recommended, very easy installation 137304

Click to Enlarge

Click to Enlarge

This is a great product . The price was $18.00 dollars cheaper than some I found online. I have a 2002 dodge ram 1500 pickup, this adapter will change the 4 pole( which is made on my truck) to a 7 pole( which is on the trailer I will be using). The product connected, and bolted up to my truck bumper very easy. E trailer is the best. 121019

Im still enjoying this product, Ive used it several times, still workingwell

Rics49 - 04/06/2015

The product did not come fully fabricated. When I connected to the trailer I could not get any signal to transfer through. So I took the item apart and the 4 pin ground was not connected to the 7 way ground. This meant I didn't get a closed circuit when connected. After stripping the ground wires and connecting them the product worked great. I would suggest buying if you know how to modify in order to connect the ground wires 46844

Just what I needed. 96904

A year later and everything is working as it should. I dont give the product much thought and thats a good thing because that means its doing its job and doing it well.

Mike M - 08/26/2014

by: Shawn Pollard02/09/2017

The only reason I did not give this a 5 star review is because of the solderless crimp connectors. Because of the connection being up under the back of the car with road grime spraying around up under there, I would think that you would want to use the heat shrink crimp connectors. That way you could seal the connection. Other that that everything else was good quality and worked perfectly. I personally cut off the connectors and used my own weather tight solution. [link] I am unable to find the pictures at the moment but will look and see if I can find them and add them later. 340173

I was wanting to pull an enclosed trailer that has 7 pole plug in, with my vehicle that only has 4 pole plug in, without messing with the wires at this time, so I ordered the 4 pole to 7 pole adapter for this purpose. When item arrived I plugged adapter in, checked lights and on my way I went. all the extra wiring is there when I decide to add a brake controller. Now I can unplug the adapter and still use my 4 pole plug in. The item was well put together with tight wiring, price was reasonable, the shipping was smooth and the website is outstanding with plenty of instructions, wiring diagrams and the how to videos are a real plus on wiring up trailers. Thanks for an informative website and great product. 222496

this connector along with the short L bracket and the mount bracket- gave me a nice connector to my hitch. Though I used the short connector and did have to slightly bend it to allow the 4 to 7 pole connector to fit. If Id bought the long L bracket-- It could have worked-- but bending a little worked well. 68963

Click to Enlarge

Click to Enlarge

Works great. We were finally able to go camping this weekend and it was nice to leave and return with the lights working. Thanks 216313

Works great. Still using it.

niccole - 08/02/2016

This product works as expected. There is not too much to the installation, just plug it in properly and mount the ground wire. I did not find an easy way to mount this to my wife's Odyssey, or to the trailer hitch (item# 75270). Luckily, I do prototype design and manufacturing. So I came up with my own solution. I designed and made my own bracket to mount the 7 pole to the trailer hitch. It works like a charm, and looks great! 387667

Click to Enlarge

Click to Enlarge

Click to Enlarge

Click to Enlarge

Click to Enlarge

I received this purchase and was installing it the next day. Luckily I read the other reviews and saw that I HAD to attach the white ground cord that was sticking out of the harness. Upon looking, I found the white wire that comes out out of the flat 4 plug isn't attached to anything thus requiring the ground to be attached to the vehicle. All in all, I was very satisfied with this purchase. 178592

I wanted to show the custom installation. I did not want it under the bumper 553041

Click to Enlarge

I ordered a wiring adapter on behalf of my daughter who has a habit of putting things off until the last minute. I found the item she needed and placed the order with only a two day window until the part was needed. It arrived on time and was PERFECT for her needs. I applaud etrailer for providing quality products with very good response to customers needs (even when they are not always reasonable). Great job. 441249

by: Zach O02/03/2017

Works great. Easy install. It's more sensitive to dirt than I expected, but that might be common to all trailer connections, I don't know. I noticed on a trip that my brake controller said NC (no connection), and I didn't have trailer brakes, which meant my blinkers probably hadn't been working, either. I got pretty worried, and looked at it and only saw just a little black gunk on one blade. But cleaning that small amount of black gunk off solved the problem. So far, so good! 338393

Thanks for your business and your review, Zach! Using dielectric grease like 11755 on your connections increases reliability and the life of the connection by preventing corrosion and sealing the connection.

-- Laura E - 02/10/2017

Helpful Link

High quality at a great price. This site is awesome also. 651313

Item shipped quickly and was in perfect working condition. Exactly what I needed! 650670

by: Jason P05/28/2019

Easy to install, a year later and they still work great. 648018

Used this adaptor to replace the factory tow package flat 4-pin connector on my 2019 Toyota Highlander. It's sad that Toyota is still using a cheap flat 4-pin connector on their factory tow package for a vehicle rated to tow 5,000 LBS. Would it really have cost that much extra for them to just use a round 6- or 7-pin connector to begin with? The installation was pretty straightforward using a new mounting bracket for the round 7-pin connector in place of the existing 4-pin bracket. I hooked up the white ground wire to the mounting screw for the new bracket after sanding paint off the bracket and nut and using dielectric grease for the ground wire and 4-pin connections. Spent some time re-routing and zip-tying wires and taped up the 3 wires on the adaptor that I won't be using. Nice clean installation. Trailer running lights, turn signals and brake lights work great. A quality product delivered in a timely manner by etrailer.com. 646987

I wish all on-line business were as good as etrailer, I have made several purchase for my trailer needs with these good folks and you cant beat the service or selection. Every hitches fits with no issues and are built extremely well 643167

Great product just what I needed 633657

by: Mike S04/12/2019

Product was just as described. Easy to use and works great. 627836

by: Rick F04/12/2019

Bought a hitch & electrical components for my 2015 Cadillac SRX. Everything connected up as explained & is working great. 625275

Delivered in only a few days packaged well. Everything was there and in good shape installation video helped very much. Love the hitch I see no problems with it at all. 615986

by: Jim03/31/2019

Nice product, fair price. Thanks 615755

I was really skeptical about this adapter but for no reason! Installed in about 10 minutes using etrailer mounting bracket, dielectric grease, a couple zip ties, and some electric tape. Worked perfectly the first time I tested it on my trailer. 613442

Click to Enlarge

Happy to get this hard-to-find 7 pin to 4 pin adapter for a crew trailer. Fast shipping and great price! 613122

It is exactly the adapter I needed for my Toyota Highlander. I bought it to replace one that was damaged when I was driving off road. I buy from etrailer because I can get the exact part I need. Local supply houses did not carry this adapter. 605972

Great product. Easy to set up. Perfect for my older Chevy k20. 605400

Good deal and the perfect item for what I needed. 603809

Great product and service! 603162

by: Clayton01/28/2019

Works good 600949

by: John01/23/2019

Great product, great price, great servi ce! 599623

by: Roger12/18/2018

Well constructed and good value. 591670

Product is good. No instructions were available, which shouldn't be a big deal but would have made me a bit more comfortable. 591122

On the product description page on our website, we have a very nice photo that explains the purpose for each wire.

-- Mike L - 12/17/2018

Excellent piece to finish up a Trailer harness for my Crosstrek 590315

the connector did not come with a mount for the bumper. How do they expect you to use it, let it dangle and drag the ground? 588536

As mentioned in the product description, the # PK12711U
Mounting Bracket and Installation Hardware - Pollak 7-Pole, RV-Style Trailer Connector - Vehicle End
$6.84 mounting bracket is available separately.

-- Mike L - 12/05/2018

Helpful Link

by: David11/24/2018

I needed a way to pull diferent trailers behind my goosnek trailer. Worked perfect for that. 584842

by: Douglas11/24/2018

Works as expected. 584821

I initially ordered the incorrect part-a light pigtail for towing a trailer, etrailer was happy to help me find the correct one which works perfectly, and help me return the incorrect part. 582491

by: Graham11/08/2018

A fine product and easy installation 581183

by: John10/05/2018

Good value for the dollar. 571810

This product works perfect if you have a vehicle with a four prong trailer connection but what you need to move is a trailer with a seven prong connector. If you use it as is, the lights all work fine but the trailer brakes won’t work. Also there is no power wire to charge a trailer battery; however, the adapter does include the extra wires so that you could hook up a brake controller and power to the plug. 570771

Couldn’t be more happier with my new project . Special thank you to Jamie for all of her professional and excellent work. Congratulations on your new customer !! That is me. 568826