bing tracking image
  1. Trailer Wiring
  2. Tow Ready
  3. Wiring Adapters
  4. Single-Function Adapter
  5. 7 Round - Blade
  6. Plug and Lead
Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector
Tow Ready

Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector

Part Number: 30717
In Stock
Trailer Wiring
Add to cart
30717 - 4 Flat Tow Ready Wiring Adapters
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Customer Photos

Need help with installation?
Locate installers near me
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.
  • All Info
  • Reviews (594)
  • Q & A (0)
  • Videos (6)
  • Photos

Tow Ready Trailer Wiring - 30717

  • 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

California residents: click here

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   (594 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!


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 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.


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.



its working well, no issues.


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


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


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!



The adapter worked out perfectly. And now after almost a year no issues whatsoever.


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 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

Carl M.


It’s a year later. Still working great no problems


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!

Etrailer Expert

Laura E.


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.


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.

Mike G.


Had the same issue with the ground kurt. Almost gave up on it until I read your post. Thanks.



Thank you so much. Ours wasnt working either until we grounded it to car frame.


Works great! Remember to ground it to: 1) tow vehicle frame, or 2) directly to tow vehicle negative terminal. Do not ground it trailer frame because you need to complete the circuit to the tow vehicle battery.


Hitch was as advertised. The printed instructions made it a breeze. Took about an hour with me and an experienced mechanic. The light kit took a little longer than expected but was installed inside the car vice behind the lights like the video showed. Towing a camper this weekend, not expecting any issues.

B K.


All is well. Don’t use it that often but when I needed it they’ve been there. I’ll use etrailer from now on.


This adapter also went well , be aware it did not come with the mounting plate ,be sure and order the mounting plate at the same time , as I had to get mine after the fact , in all honesty it was my mistake .Unless this is a repair replacement you will need the plate to install this item .



Hi ! The products are working just dandy


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


The website was extremely easy to use especially with the feature to pick my vehicles connection and my trailers connection. My purchase arrived very promptly and the customer service was excellent. The adapter works perfectly and I will definitely shop from etrailer again.

Ben B.


I appreciate the follow-up. I must say that your company has provided an excellent customer service experience for me. I wish more companies cared as much. The product still works great. I use it when towing my trailer regularly.


Wiring harnesses will simplify the job I'm doing glad that I found these products and I also had a good experience dealing with etrailer they keep you informed about shipping and the products are ship fast. Thank you


Great product makes wiring a 4 flat to a 7 rv blade a snap. However the ground in the 4 flat is not connected. Must connect extenal grd.Not a big deal. One nice thing is shipping is resonable!!

Harold Z.


Outstanding, no issues with corrosion on plug


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.

Al N.


could not be happier with the purchase that I made


We only discovered this site recently and LOVE it. You don't have to know what you want, the questions lead you to exactly what you are needing. The item is of great quality, and as described. We can now swap from truck to jeep with our trailer, and simply without effort.

We have found our new 'to go' store for our trailer shopping. Customer Service by the way, terrific, great communication, and very quick shipping. Really Great Experience, Highly recommend.



Weve moved in the past year, our new home 250 miles away from our old one. We used the hitch a lot, did I say a lot? daily round trips, never had a single problem with it. Worked like a champ. Thanks


Very well made, works well for older vehicle equipped with 4 pin to have working lights on a 7 pin trailer.



Thanks for the follow up, the items I ordered are doing fine and Ive mentioned your website/company to family and friends. Keep up the good work.


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.

Etrailer Expert

Sierra K.


Item # 18138 is the mounting bracket that works with this wiring.


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

Show More Reviews

See what our Experts say about this Tow Ready Trailer Wiring

  • 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.
    view full answer...
  • What Parts Do I Need To Upgrade My 4 Flat To A 7 Way Connector And Use A Wireless Brake Controller?
    It sounds like you are definitely on the right track here. You would plug the Adapter # C57672 into the existing 4 flat plug. Then the Kit # C51500 contains the rest of the wires you will need to run to upgrade to a 7 way. From there you will be ready to plug in and use a wireless brake controller like the # C51180. Since the Curt echo works off of the vehicles brake lights, technically you would only need to connect the 12v wire to the 7 way plug in order to use it. The additional wires...
    view full answer...
  • Is There Better Way To Charge Your Trailer Batteries While On The Go
    Hey Brady, The solar panel system should've done a good job of keeping the batteries charged in storage unless a lot of things were left on pulling a large load. I'd be curious to see if the solar panel system was installed correctly and actually sending power to the batteries. To answer your question, yes, there is another way to charge your trailer batteries while towing with one of Redarc's BCDC chargers. Something like the 25 amp # 331-BCDC1225D would be more than enough to charge...
    view full answer...
  • Wiring Needed to Use the Curt Echo Brake Controller on a 2015 Jeep Cherokee
    I'm glad to hear that you will only be towing your trailer with your 2015 Jeep Cherokee when it is empty. I was a little afraid that you were planning on hauling a car. Since the trailer weighs 500 lbs under the max towing capacity of your Cherokee you should be just fine traveling at highway speeds. Since your trailer will have brakes it isn't a bad idea to go ahead and wire up your Cherokee so that you can use your Curt Echo # C51180. For this you just need the 7-Way RV Upgrade Kit #...
    view full answer...
  • Does Yellow Wire of 4-Way to 7-Way Adapter part # 30717 Need to be Connected
    The aux circuit of the # 30717 which is the yellow wire does not have to ran anywhere if the trailer does not need it. Typically this would run to the reverse light circuit if a back up light or reverse lockout solenoid was used. But for nearly all RV applications you don't have to connect that wire.
    view full answer...
    Image 1 for
  • Where Does the Black Wire Attach for Harness 30717 on a 2003 Chrysler Town and Country
    The black 12 volt lead on Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector, # 30717, attaches directly to the battery on your 2003 Chrysler Town and Country. You will have to attach the black wire to a length of additional wire, like 10 Gauge Blue Primary Wire - per foot, # 10-1-1, under your vehicle and run that wire to the battery through a 40 amp circuit breaker, # PK54540.
    view full answer...
  • Recommended Replacement 4-Pole To 7-Pole Vehicle End Connector
    Yes, since you're not really needing the full # ETBC7 kit you could just use the Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector # 30717 to swap out your current 7-way for one that can be used with brake controllers. The blue wire would be for a hardwired brake controller and the yellow wire is for connecting to the reverse light circuit. Since you won't need either of these wires at this moment I recommend just capping the together with some electrical tape and then tucking them...
    view full answer...
  • Wiring Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector
    You could wire the Tow Ready Adapter 4 Pole to 7 Pole # 30717 without the brake functions and just have the light functions on your tow vehicle without connecting the other wires. But I would be very cautious about not doing so for several reasons. The main reason is safety. The general rule for towing trailers with brakes is that if the Gross Trailer Weight is half of the Gross Vehicle Weight it is recommended to use a brake controller and have brakes on the trailer. Not being able to...
    view full answer...
    Image 1 for
  • Parts Needed to Install 7-Way Trailer Connector on 2020 Ford Transit T250
    If your trailer is equipped with a 7-Way but you only need to power its basic signal lights (and not electric brakes) then adding a 7-Way connector to your 2020 Ford Transit T250 will actually be fairly simple. To do this you will need to start with a 4-Way harness. For this I highly recommend the Curt T-Connector # C56327, which will plug into existing ports behind the driver and passenger side tail lights. Once those connections are made you will run the power wire up to the Transit's...
    view full answer...
  • Installing Battery Charge Line on Motorhome and Towed Vehicle to Maintain Dinghy Battery
    The Roadmaster Battery Charge Line Kit for Towed Vehicles # RM-156-25 is a great help for your 2012 Honda CR-V especially because your Patriot brake unit will be drawing power. To utilize this you will need power from your motorhome as well using the Roadmaster Battery Charge Line Kit for Motorhomes # RM-156-75. Since you only have a 4-way on your motorhome and vehicle, you will need a different connection. I recommend using the Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector...
    view full answer...
    Image 1 for Image 2 for
  • Adapter Recommendation for Towing a Trailer with a 7-way with a Tow Vehicle that has a 4-Way
    Sounds like your tow vehicle has a 4-way and you are looking or an adapter so that you can tow your trailer with surge brakes and a 7-way connector. For that you would want the part # 30717. The extra wires would just get taped up and out of the way. I attached a review video for you to check out as well.
    view full answer...
  • 2018 Toyota Sienna SE 7 Pole Trailer Wiring
    You have a couple options for your 2018 Toyota Sienna SE, the one that I recommend is getting the Hopkins wiring kit # HM11143495 because it will work with the SE SUB model Sienna. The kit you were looking at # TK87FR is not supported by the SE model. Yes, the Hopkins kit is just a 4 pole connector, but your can get an adapter like # 30717 you will be ready to haul! If you wanted to go the universal route, get the Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way...
    view full answer...
  • Parts Needed to Add 7-Way Trailer Connector on 2016 Kia Sorento
    In order to have a fully functional 7-Way trailer connector on your 2016 Kia Sorento, you will want to install the 7-Way and 4-Way Universal Installation Kit for Brake Controllers # ETBC7. This kit includes a 7-Way blade-style connector that will work for you to connect your trailer to your Sorento. The 7-Way connector will install by plugging into your existing 4-Way connector, and the wiring needed to make the remaining connections and to install a brake controller is included with the...
    view full answer...
  • Installation Instructions for 4 Pole to 7 Pole Adapter part # 30717
    Part # 30717 is a universal item that can be installed on virtually any vehicle, so there are no vehicle specific instructions, but I will outline how it is done. The 4 pole connector, Green/Yellow/Brown wires, will connect to the 4 pole already on your 1999 Jeep Grand Cherokee. The Blue wire is run up the truck and connected to the brake output wire on your brake controller, usually also blue. The White wire is a ground wire and should be grounded to the vehicle frame. The Black wire is...
    view full answer...
  • 4-Pole Flat Wiring Harness for 2008 Nissan Frontier
    The # HM43575 would work as a replacement, you would need to unplug your current harness and plug in the Hopkins in the 4-pole connector slot; you can see exactly where in the photo I've provided. I've also attached a link to a video review of this product for you to take a look at.
    view full answer...
    Image 1 for
  • Compatibility and Conversion of Curt True Course Electric Sway Control with 12-Pin Plug
    The Curt Sway Control System # C94VV will be adaptable to a 12 way system and then back again if you use the 7-way like # 30717 and # H20046 . Then to combine the turn and brake functions prior to the unit use the Roadmaster Brite-Lite Wiring Converter # RM-732. If you need to convert it back following the unit, use # C56196 to separate the brake signal again. If you don't want to use all the US 7-Way adapters you can use the Autowbrake Electric Brake Controller - Trailer Mount - 1 to...
    view full answer...
  • Recommendation For Adapter For 4-Pole To 7-Pole Vehicle End Trailer Connector
    I have a great option for your situation. The Tow Ready Adapter 4-Pole to 7-Pole Vehicle End Trailer Connector, Item # 30717, will give you the ability to connect your vehicle to the trailer as well as the option to use only the functions you need. For any functions you are not using, simply tape up those wires in a bundle and store them away. After that, connect the ground, mount the connector, and your are good to go. I have attached a video for you to check out.
    view full answer...
  • Recommended 7-Way Trailer Connector On A 2016 Chevrolet Traverse Without Factory Tow Package
    If you are looking to match a factory type set-up on your 2016 Chevrolet Traverse, then the round factory plug you are referring to is a 7-way trailer socket. Because you don't have the factory tow package, we need to take a couple steps to get us there. The first step is to see if the factory wiring for a tow package is present. Look behind the bumper on the passenger side for a connector. If there is a connector, we will just need # 18138. This will allow us to simply connect the...
    view full answer...
  • Wiring for Toyota 2010 Highlander with a 7-Way connector for Towing
    You will need the Curt Class III Round Tube Trailer Hitch, item # 13534, and with the tow package you will need the T-One Connector Wiring Harness with 4 Pole Trailer Connector - Toyota Highlander, item # 118449. I would go ahead and install the 7-Way connector. We have the Brake Controller 7 & 4 Way Installation Kit, item # ETBC7, which includes everything needed to install the wiring for the 7-way connector, once you have the 4-Way installed. You mentioned a 5-Way connector and if you...
    view full answer...
  • Wiring Harness, 7-Way Trailer Connector and Mounting Brackets for a 2006 Jeep Wrangler
    You are correct, the Plug-N-Tow (TM) Vehicle Wiring Harness, item # 32625, only plugs into a connection point on the driver side. This is because Jeep has already run all the necessary wires to that port for you, so you do not have to run the wires across yourself, as you would have to with other models that plug into both the driver and passenger taillights. The Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector item # 30717, will work with the 4-pole wiring harness, item # 32625,...
    view full answer...
  • 7-Way Wiring Harness and Brake Controller for a 2018 Subaru Outback Wagon
    Yes, we do have both an adapter and a complete wiring harness to add a 7-way connector to your 2018 Subaru Outback Wagon. You will need the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector item # 118467 you referenced. This will provide your Subaru with a 4-flat vehicle connector that will control your trailer's lighting functions. To control the brakes you will need the Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge...
    view full answer...
  • Brake Controller Wiring on a 2002 Ford F-250
    For the Pilot 2-6 Brake Electronic Brake Controller - Time Delayed # 80550 you can use Brake Control Wiring Adapter # 3035-P. If you have factory 7-Way the only part needed to install a brake controller is the brake controller and wiring adapter. Usually the factory will already give you a brake control adapter that connects to the brake controller and plugs into the dash. If you do have this harness you can also use it with the Pilot. The OEM plug is on the drivers side, usually on the...
    view full answer...
  • Can Extra Wires of the 4-Way to 7-Way Adapter 30717 be Taped Up If Not Needed
    If the surge brakes on your trailer do not have an electric reverse lockout then you could just tape up all of the wires that you didn't need of the # 30717 and you would be good to go. If the trailer does have an electric reverse lockout you would need to run the yellow wire to the reverse light circuit of your trailer and then also ground the white wire and you would be good to go.
    view full answer...
  • 4-Way Vehicle to 7-Way Trailer Adapter for Tow Vehicle without Brake Controller
    The part # 30717 would be a great solution. It would plug into your vehicle 4-way and give you a 7-way for your trailer to connect to.
    view full answer...

< Previous
123. . .16

Do you have a question about this Trailer Wiring?

Info for this part was:

Employee Joe V
Test Fit:
Joe V
Employee Robert C
Test Fit:
Robert C
Employee David F
Test Fit:
David F
Employee Mike L
Expert Research:
Mike L
Employee Robert G
Expert Research:
Robert G
Employee Patrick B
Expert Research:
Patrick B
Employee Michael H
Expert Research:
Michael H
Employee Jeff D
Expert Research:
Jeff D
Employee Reno H
Expert Research:
Reno H
Employee Jameson C
Expert Research:
Jameson C
Employee John H
Expert Research:
John H
Employee Adam R
Expert Research:
Adam R
Employee Lori W
Expert Research:
Lori W
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Andrew K
Video by:
Andrew K
Employee Alan C
Video by:
Alan C
Employee Joshua S
Video Edited:
Joshua S
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
Chris R
Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
Updated by:
Alexander C
Employee Ryan G
Installed by:
Ryan G

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.