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  1. Trailer Wiring
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  4. Single-Function Adapter
  5. 7 Round - Blade
  6. Plug and Lead
Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector

Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector

Our Price: $35.25
Trailer Wiring
Orders above $99 qualify for Free Shipping
Shipping Weight: 0.49 lbs
30717 - 4 Flat Tow Ready Wiring Adapters
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Great Prices for the best trailer wiring from Tow Ready. Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector part number 30717 can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (578)
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Tow Ready Trailer Wiring

  • Wiring Adapters
  • Single-Function Adapter
  • 7 Round - Blade
  • Plug and Lead
  • 0 - 5 Feet Long
  • 4 Flat
  • Tow Ready

  • Adapter converts from 4 pole wiring on vehicle to 7 pole round plug
  • Additional wire leads for brake, power and accessory are 12" long
  • Mounting bracket (18138) is sold separately

Wiring diagram

Product detail

20321 Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector

Item # 30717

California residents: click here

Video of Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Tow Ready Wiring - Wiring Adapters - 30717 Review

Customer Satisfaction Score:

Customer Reviews

Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector - 30717

Average Customer Rating:  4.8 out of 5 stars   (578 Customer Reviews)


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!


Super Service at ETrailer - I have never had an issue with the help provided or with any product

Was easy to install. Fit perfect. Has stayed looking great. It is great having a mounting bracket for the electrical hookups. It keeps the 7pin more out of the way and more solid.
Paul - 10/05/2022


Every phone encounter I’ve had with etrailer has been excellent. Their staff on the phones know their stuff and they have most every rv/trailer accessory known to man. The seven pole side is much more robust than the four pole side, which I leave connected all of the time. Problem solved


The biggest problem ihad; was unclipping the factory connections


The staff is very friendly. I would have awarded 5 stars but there was a shipping issue. They did get me all the parts I ordered, with simple communication, a couple pictures and minimal frustrations I got everything over two shipments. It took a little longer to get everything then anticipated. They deserve 4.5 stars not just a 4. I will do business with them again and I do recommend them. Will be ordering a receiver hitch through them this spring.


i had to replace these two items as my dear daughter went down our goat path driveway too fast. they replaced the originals from etrailer from the prior year. shipping is timely and customer service actually helps! i wired from battery to controller to hitch myself, and everything fit.


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.


Average quality part, would be nice to include a mount but ended up going the extra mile and used a hole saw to install it in my van’s bumper out of harms way. Would be easily damaged if mounted near the hitch.

Item # 18138
Mounting Bracket for 7-Way
is the mounting bracket that works with this wiring.
-- Etrailer Expert Sierra K - 12/01/2021


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.


This was perfect for my needs. Good quality too.

The product is working out great. I have not had any issues with it.
Teo - 10/10/2022


Works great. Easy install.

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!

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.
-- Etrailer Expert Laura E - 02/10/2017


I really appreciate you following up on my order. The information and videos will help when I drop the harness and circuit breaker off at my local shop. When I went to them originally with my problem I couldn't answer all their questions. With the parts in hand they should be able to convert my four prong to the seven prong plug used on my new trailer. Thanks also to Craig at CampInn for directing me to your site and the parts they are using in the construction of my trailer.


Perfect fit, great quality product and it was easy to install!


Installed the wiring harness for 2021 Toyota Tacoma. Everything went together just as noted in the instruction.


This 7 point harness wired right in with my T1 connector and is great for hooking up to my camper, very easy to install!


Joe at etrailer was able to provide this solution and saved me literally hundreds of dollars to have a reputable place put in a new harness onto my AWD MKX. Thank you!


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


Every time etrailer has provided me with the needed wiring!


I bought this because I hated the flat four pole that just hung over the bumper. Drilled a 1 7/8 inch hole in my bumper with bimetal hole saw. Mounted nice and clean. Be sure to hook up the White ground wire to your frame. The ground wire from the flat four does not pass thru this connector. Also if need be you can still pull a trailer with a flat four pole just by unpluging it

It’s a year later. Still working great no problems
Carl m - 01/13/2019


Had a great experience ordering from etrailer.
arrived fast and customer service was excellent.


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


Yes, very nicely designed wiring harness. Works Great....


Kyle was extremely helpful in not only finding the right hitch but the accessories I needed to go with it. Would definitely recommend to all my friends. Prices were excellent too!


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.

Im still enjoying this product, Ive used it several times, still workingwell
Rics49 - 04/06/2015


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.

could not be happier with the purchase that I made
Al N - 05/26/2016

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