Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector

Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector

Item # 30717

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Tow Ready Plug and Lead Wiring - 30717
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Product Images

In Use/Installed

Customer Photos


  • Wiring Adapters
  • Single-Function Adapter
  • 4 Flat
  • 7 Blade
  • Plug and Lead
  • Tow Ready
  • 1 Foot Long
Lowest Prices for the best wiring from Tow Ready. Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector part number 30717 can be ordered online at etrailer.com or call 800-298-8924 for expert service.


  • All Info
  • Reviews (447)
  • Q & A (304)
  • Videos (5)
  • Photos
  • Why etrailer?

Tow Ready Wiring - 30717


  • 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


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 Reviews

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

Average Customer Rating:  4.8 out of 5 stars   (447 Customer Reviews)


- 30717
by:

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



- 30717
by:

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


Comments

Its a very good product

Dave R - 07/27/2016

19729

- 30717
by:

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


Comments

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

44781

- 30717
by:

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


Comments

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

-- comment by: mike g - 06/17/2014

4951
Comments

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

-- comment by: Sarah - 10/08/2015

15483

- 30717
by:

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



- 30717
by:

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


Comments

could not be happier with the purchase that I made

Al N - 05/26/2016

18023

- 30717
by:

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



- 30717
by:

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


Comments

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

8683
Comments

Did you also use a brake controller when,yiu went from 4 to,7

-- comment by: Denise - 03/14/2016

17110
Comments

@Denise, Yes I do have a brake controller installed.

-- comment by: Tim K - 03/15/2016

17120

- 30717
by:

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



- 30717
by:

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


Comments

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

Rics49 - 04/06/2015

10630

- 30717
by:

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



- 30717
by:

Just what I needed. 96904


Comments

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

6464

- 30717
by:

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



- 30717
by:

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



- 30717
by:

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



- 30717
by:

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


Comments

Works great. Still using it.

niccole - 08/02/2016

19865

- 30717
by:

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



- 30717
by:

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



- 30717
by:

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



- 30717
by:

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



- 30717
by:

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


Comments

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

22429

- 30717
by:

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



- 30717
by:

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



- 30717
by:

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



- 30717
by:

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



- 30717
by:

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



- 30717
by:

Great product just what I needed 633657



- 30717
by:

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



- 30717
by:

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



- 30717
by:

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



- 30717
by:

Nice product, fair price. Thanks 615755



- 30717
by:

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



- 30717
by:

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



- 30717
by:

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



- 30717
by:

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



- 30717
by:

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



- 30717
by:

Great product and service! 603162



- 30717
by:

Works good 600949



- 30717
by:

Great product, great price, great servi ce! 599623



- 30717
by:

Well constructed and good value. 591670



- 30717
by:

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


Comments

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

46810

- 30717
by:

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



- 30717
by:

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


Comments

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

46420

- 30717
by:

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



- 30717
by:

Works as expected. 584821



- 30717
by:

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



- 30717
by:

A fine product and easy installation 581183



- 30717
by:

Good value for the dollar. 571810



- 30717
by:

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



- 30717
by:

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


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Show More Reviews

Ask the Experts about this Tow Ready Wiring
Do you have a question about this Wiring?


  • What is Required to Use Curt Echo Trailer Brake Controller
  • To use the Curt Echo Wireless Trailer Brake Controller # C51180 your vehicle only needs 12 volt, ground, and turn signals connected to its 7-way socket. What this means is you do not need the brake signal from the 7-way. For example, if you used a 4-to-7 way adapter such as # 30717, there will not be an output wire from the Echo to connect to, so you could simply tie that wire off, as you can see by the accompanying diagram. Apart from that the only other thing required is that your...
    view full answer...

  • How to Connect Trailer 7-Way to 2017 Toyota Highlander with Factory 4-Way
  • We have just what you need to tow your camper with your new 2017 Toyota Highlander. First, if your Coleman Popup Camper does not have electric brakes and you are only needing to power its rear signal lights, I recommend installing the Tow Ready Adapter Vehicle End # 30717. This will plug right into the 4-Way connector on your Highlander to provide a 7 pole round plug to hook up with your trailer. You will simply tie off the remaining wires from the adapter as they will not be needed...
    view full answer...

  • Tekonsha Brake Controller Adapter for a 2018 Jeep Cherokee
  • In order to install the Tekonsha Primus IQ Trailer Brake Controller part # TK90160 on your 2018 Jeep Cherokee you will also want to use the Tekonsha Custom Wiring Adapter for Trailer Brake Controllers part # 3014-P. This adapter is a direct plug and play option that will allow you to install the Primus IQ on your Jeep without having to cut or splice any wires. The adapter will plug into the the back of your brake controller and into a pigtail harness under your drivers side kick panel. If...
    view full answer...

  • Which Harness do I Need For My 2004 Ford Ranger
  • Thank you very much for your question, and I'm sorry about the confusion, but we shall clear things up right now. Since your 2004 Ford Ranger is already complete with a tow package and a 4 pin connector, depending if you want to use a brake controller or not to control the brakes on the trailer will determine the solution for this question. First, I will give you instructions for If you were not planning on using a brake controller. The product you need is a 4 pole to 7 pole adapter...
    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...
    view full answer...

  • How to Select Weight Distribution System for Horse Trailer
  • For your 2018 Toyota Highlander, the Curt hitch that fits is # C13200 and this hitch is compatible with weight distribution systems. It has an 8,000 lb towing capacity and 900 lb tongue weight capacity when used with a weight distribution system, which gives us a good idea of the system you need. In order to choose the best weight distribution system you will first need to know your total tongue weight (TTW), which is the tongue weight of your fully loaded and ready to go trailer plus...
    view full answer...

  • Recommended 7-Way Trailer Connection for 2006 Acura MDX
  • Since you already have the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118336 you will need to add a 7-way adapter like # 30717 to get your 7-way connection. Because your RV most likely has trailer brakes, I recommend you use the Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat # ETBC7. This kit will give you that 7-way adapter but will also give you the wiring, connectors, and circuit breakers needed to install a brake controller...
    view full answer...

  • Compatibility and Conversion of Hayes SwayMaster Electric Sway Control with 12-Pin Plug
  • The Hayes Sway Master Electronic Sway Control System - 1 to 4 Axles # HA81775 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...
    view full answer...

  • Installing a Trailer Battery Charge Line from Vehicle Trailer Connector
  • To charge your trailer battery when you look at the 7-way trailer-side connector the 11 o'clock pin will mate up to your 12V signal from your vehicle. With most trailer connectors like # H20043 this will be the black wire. That black wire simply connects using 10 gauge butt connector like # DW05745-5 to 10 gauge wire sold by the foot # 10-1-1 which will connect to your trailer battery positive terminal. As you stated the negative terminal of the trailer battery will be connected to the...
    view full answer...

  • Converter for 2018 Freightliner With Separate Lights
  • The item that would work for you is the ModuLite Circuit Protected Vehicle Wiring Harness with Install Kit # 119190KIT. This kit has a converter that will adapt the 3-wire system on your 2018 Freightliner to work with the 2-wire system on your trailer. To make the installation easier I recommend using ModuLite Installation Wiring Kit # 118151. You would then be able to use adapter # 30717, plug the 4-way in and wire the remainder of the 7-way. I've added links to video reviews of these...
    view full answer...

  • Parts Needed to Install 7-Way Connector and Trailer Brake Controller on 2015 GMC Terrain
  • For your 2015 GMC Terrain that does not have the factory tow package, you will need to start by installing a 4-Way connector. For this I recommend the Tekonsha T-One Vehicle Wiring Harness # 118494. This harness is custom-fit for your vehicle and will install by connecting directly to the built-in ports located behind the driver and passenger side interior trim panels in the rear cargo area. You will then run the hot lead up to the vehicle's battery. I have attached the written installation...
    view full answer...

  • Installing a Brake Controller on a 1996 Dodge Ram 2500 with Factory 4-Way Connector
  • The plug-in adapter that you need depends on what brake controller you have. If you don't already have one then I highly recommend the Tekonsha Prodigy P2 # 90885 as it is one of our most popular choices and has received great customer reviews. The plug-in adapter needed to install this brake controller on your 1996 Dodge Ram 2500 is part # 3020-P. Then for a 7-Way you need the Tow Ready # 30717 and some wiring. If you only need the brake controller function then you simply need to route...
    view full answer...

  • Recommended Trailer Wiring and Brake Controller for 2010 Toyota Sienna
  • A 4-Way to 7-Way adapter like the Tow Ready # 30717 is perfect for plugging right into an existing 4-Way like you have on your Sienna and providing a 7-Way on the other end to match up with the 7-Way on a trailer. After this simple connection, this adapter will be able to power the trailer's basic signal lights. In order to activate the 12V pin on the connector and power the trailer's electric brakes, the additional wires coming out from the adapter will need to be connected. If you...
    view full answer...

  • Parts Needed to Install a Brake Controller on a 2005 Dodge Ram 1500
  • If your 2005 Dodge Ram 1500 did not come with a factory trailer connector then you will need to hardwire the Tekonsha Prodigy P3 Trailer Brake Controller part # 90195 with the included harness. You will also need both a 4-way like part # C55504 and a 4 to 7-way like part # ETBC7 to complete your wiring. If your Ram came with a 4-way trailer connector then you can use part # 3020-P to install the controller. You will also need a 4 to 7-way like part # 30717 to complete your wiring. If...
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  • What is Needed to Install Tekonsha Primus IQ Brake Controller on 2010 Jeep Wrangler Unlimited
  • To install the Tekonsha Primus IQ Brake Controller, # TK90160 on your 2010 Jeep Wrangler Unlimited with factory 4 way tow package, you will need the wiring installation kit # ETBC7. This will include everything you need to install both the brake controller and a fully functional 7-way connector to hookup to your trailer. The 7-way connector will provide a wire for your camper's battery as well. The 4 Pole Adapter # 30717 that you referenced in your question will work for simply converting...
    view full answer...

  • Adapter Recommendation for a FJ Cruiser with a 4-Way Towing a Trailer with a 7-Way
  • Yes, the Adapter 4 Pole to 7 Pole # 30717 that you referenced will do exactly what you want and will allow your FJ Cruiser to connect to your trailer that has a 7-way. A better choice might be the # 37185. This comes with a mounting bracket and a 4-way on the side of the 7-way as well. Either adapter will allow to tow your trailer and all of the taillight functions will work properly.
    view full answer...

  • How To Wire Brakes From Trailer To 2004 Honda Odyssey
  • To activate and control the brakes on your trailer you will need to install a brake controller and 7-way connector on your 2004 Honda Odyssey. For a brake controller, I would recommend the Tekonsha Prodigy P2 Brake Controller, part # 90885, which is a proportional brake controller. A proportional brake controller sends power to the trailer brakes in proportion to the brake force applied to your vehicle. To install the Prodigy P2 Brake Controller, you will first need to install the...
    view full answer...


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Info for this part was:

Test Fit:
Joe V
Photos by:
Theodore B
Expert Research:
Michael L
Video by:
Andrew K
Expert Research:
Robert G
Expert Research:
Patrick B
Expert Research:
Michael H
Expert Research:
Jeff D
Expert Research:
Reno H
Expert Research:
Jameson C
Video Edited:
Joshua S
Expert Research:
John H
Expert Research:
Adam R
Updated by:
Laura H
Video Edited:
Dustin K
Expert Research:
Lori W
Expert Research:
Jeffrey L
Video by:
Alan C
Photos by:
Sam P
Video Edited:
Chris R
Updated by:
Sarah W
Updated by:
Alexander C
Test Fit:
Robert C

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