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Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector

Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector

Item # 30717
Our Price: $31.58
Trailer Wiring
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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 etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (593)
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Tow Ready Trailer Wiring - 30717

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


  • 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   (593 Customer Reviews)


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!



by:

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.

Bruce

3/23/2023

its working well, no issues.



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.



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.



by:

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



by:

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!

James

1/23/2023

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



by:

Every time etrailer has provided me with the needed wiring!



by:

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



by:

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



by:

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.



by:

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.



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!

Etrailer Expert

Laura E.

2/10/2017

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.



by:

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.

1/13/2019

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



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.

Mike G.

6/17/2014

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

Sarah

10/8/2015

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



by:

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



by:

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.

8/10/2018

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.



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.

Rics49

4/6/2015

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



by:

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.

10/19/2017

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.



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.

Al N.

5/26/2016

could not be happier with the purchase that I made



by:

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.

Mtkruger

3/24/2015

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



by:

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

Paul

10/5/2022

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.



by:

Works great to get the 7 pole connection that I needed for my trailer.



by:

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.

12/1/2021

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



by:

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



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.


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Show More Reviews

See what our Experts say about this Tow Ready Trailer Wiring

  • Recommended Plug-In Adapter To Install Tekonsha Prodigy P3 90195 In 2005 Ford F-150 W/ Factory 4-Way
    Since your 2005 Ford F-150 has the factory trailer brake controller port underneath the dash, the Tekonsha Plug-In Wiring Adapter # 3035-P you mentioned is correct for installing your Tekonsha Prodigy P3 # 90195. In addition the Curt Trailer Hitch Receiver - Custom Fit - Class IV - 2" # C14357 you were looking at is confirmed to fit your truck as long as it does not have a factory trailer hitch receiver. It sounds like your truck has a 4-way connector but not a 7-way connector based on...
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  • Converting 4-Way Trailer Connector to 7-Way Trailer Connector
    Yes. A 4-way trailer connector can be converted to a 7-way using an adapter like # 30717 but you will only have the same 4 functions active unless you complete the wiring. If you want to wire the remaining 4 functions of an active 7-way (the 12V power, brake controller output, and reverse lights), you will need to either tap into existing wiring or run new wires. If you want the kit to give you a complete system, I recommend the # ETBC7 which comes with the adapter, wiring, circuit breakers...
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  • What Size Fuse/Breaker is Needed On Power Wire of 4 to 7-Way Adapter for Curt Echo
    The Curt Echo Wireless Trailer Brake Controller part # C51180 will work with pretty much any 4 to 7-way adapter like the Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector part # 30717. The black wire on said adapter would need to be attached to the vehicle's battery but I do recommend a higher rated 40 amp fuse/circuit breaker, part # 9510. The 4-pole converter harness would not have an affect on the brake controller.
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  • Recommended 7-Way Connector for 2019 Toyota Highlander for Trailer Lights
    We have everything you need to install a 7-Way connector on your 2019 Toyota Highlander and the process won't be difficult at all! To start you will need to add a 4-Way trailer harness. For this I highly recommend the Tekonsha T-One # 118449, which is custom-designed to plug right into an existing port beneath the spare tire compartment in the Highlander's rear cargo area. This is a completely plug-and-play install and it will provide you with a 4-Way connector that can power a trailer's...
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  • What Type of Trailer Wiring Would 2017 Jayco Sport 10SD Have On it
    It was somewhat hard to see in the pictures I found of the camper online but I was able to see a 4-way so you should be good since your Highlander has one. You might contact the dealer and verify before you drive as the owner could have installed a 7-way in place of that. In that case a simple 4-way to 7-way adapter part # 30717 would be an easy adapter to bring with you just in case.
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  • Can Power Wire For 4-way Connector 118754 Be Used As Power Wire For 7-way Connector As Well?
    I would be happy to help! While it seems redundant, you will need to run an additional power line from your new 7-way connector to the positive terminal of your vehicle's battery. The reason for this is the power wire you ran for the Tekonsha T-One Connector # 118754 is to power the lights and keeps from pulling power from your vehicle's light circuits. The power wire for the 7-way connector is for the 12v auxiliary power pin, and needs its own dedicated circuit like it would have in...
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  • Connecting Ignition Switched Power From 2015 Toyota Prius v to Enclosed Trailer
    You will need to use a circuit tester like # PTW2979 to find a wire in your 2015 Toyota Prius v that is hot only when you use your key (ignition switched power). When you do that you can simply wire in the Battery Isolation Solenoid # PK5231201, which should be wired like in the accompanying diagram with 10 gauge wire # 10-1-1. I have added a link to a video review of the solenoid for you to check out.
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  • Where is the Electric Trailer Brake Wire Terminate on a 2000 Dodge Ram
    On your 2000 Dodge Ram brake (blue) wire does not run all the way back to the 4-pole at the rear; it stops at the connector that is located under the driver's side wheel well. In order to finalize the installation of a 4-Way to 7-Way adapter such as # 30717 you must splice into this wire and continue it back to the adapter. For additional wire you can use # 10-1-1 sold by the foot. This is only on trucks that came with a factory 4-Way connector.
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  • Does The Yellow Wire Coming For The Adapter 4 Pole to 7 Pole Have To Be Attached
    The yellow wire coming from the back of the 7-way connector on the Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector part # 30717 is an auxiliary wire used for reverse lights or a reverse lockout. Therefore, no the yellow wire will not need to be attached in order for the trailer's tail lights to work.
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  • What to do With the Extra Wires on 4 to 7 Pole Adapter for a Camper Trailer
    On the Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector, # 30717, the extra wires can be taped off, tied up with a cable tie, and tucked out of the way if not in use. I would attach the white ground wire to an existing grounding point or the vehicle frame even if you do not intend on adding a brake controller (which is what the other wires are for). You would then attach the vehicles 4-Way into the 4-Way end of the adapter and plug your trailer connector into the 7-Way for lights...
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  • 4 Pole to 7 Pole Vehicle End Trailer Connector 30717 Yellow Wire
    The yellow wire on the Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector, part # 30717 can be used as an auxiliary wire. Some people will use it to light the reverse lights on their trailer, as a reverse lockout circuit or maybe to power a break-away kit. If you do not have a need for the additional source, the wire can be grounded with your ground wire.
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  • Brake Controller Wiring for 7-Way Trailer Connector # 30717 on 2010 Ford Expedition
    For your 2010 Ford Expedition, the Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector # 30717 will use 10 gauge wire # 10-1-1 sold by the foot to connect to the blue brake controller output wire. The factory wire is along the rear frame rail. You can then use a brake controller like the Prodigy P3 # 90195 and custom wiring harness # 3035-P to complete your trailer braking system. I've attached some videos to assist.
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  • Installing a 4-Way to a 7-Way pole adapter on a 2007 Nissan Murano Without a Brake Controller
    If you do not plan on using a brake controller, it is not necessary to wire to one when converting your 4-Way adapter to a 7-Way adapter on your 2007 Nissan Murano. You can just cap off the brake controller wire on the adapter and safely stow it away. You can use the 4 Pole to 7 Pole Vehicle End Trailer Connector # 30717 as well. To wire the hot lead to the car battery, you will need to run the power wire on the 7-way to the positive terminal on the vehicle battery. I recommend using...
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  • 7-Way Trailer Wiring Recommendation for a 2012 Nissan Pathfinder with 4-Way
    If you wanted to install a 7-way on your 2012 Nissan Pathfinder you would want the Tekonsha 7-Way Kit part # 118266. Some of the components of the kit wouldn't be needed since you already have the 4-way but this will come with everything needed to complete the install. I attached an install video for you to check out as well.
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  • Wiring Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector for Curt Echo Brake Controller
    In regards to the Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector part # 30717; the white wire goes to ground, the yellow wire gets tapped up, the black wire goes to the battery, and the blue wire goes into the cab to a trailer brake controller. If you're using a wireless trailer brake controller like the Curt Echo Wireless Brake Controller part # C51180 then the blue wire won't get used. Instead of the Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector, I recommend the 4 to...
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  • 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.
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  • 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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  • 4-Way to 7-Way Adapter Recommendation for Towing 2002 Coleman
    What you need is a 4-way to 7-way adapter. The part # 30717 would work, or you could use the part # 37185 which is similar but comes with a mounting bracket for the 7-way. I would recommend cleaning that 7-way though! Otherwise you may not get all taillight functions to work. If you do have trailer brakes you would need the # ETBC7 instead of the # 37185 and a brake controller. This kit comes with everything needed to wire up the 7-way and install a brake controller. For a brake controller...
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  • 5th Wheel Wiring Harness for 2000 Ford F-150 Extended Cab
    Yes, you can add a second 7-way in your truck bed for 5th wheel towing while keeping your existing bumper-mount 7-way active. Curt harness # C56000 plugs in inline with the existing wiring leading to your 7-way. It allows that socket to remain active while adding the second 7-way in the truck bed for towing your 5th wheel trailer.
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  • 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.
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  • Using Adapter To Convert 7-Way Connector To 4-Way Connector
    If you have a 7-way connector on your vehicle and want to use a 7-way to 4-way adapter, the converter is built-in on the adapter like Pollak 7 Pole to 4 Way Connector Adapter, part # PK12716. If you are converting a 4-way on the vehicle to a 7-way for the trailer I recommend part # 30717. You will plug the adapter into the 4-way on the vehicle and then attach the remaining wires as shown in the attached photo.
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    Image 1 for
  • Grounding Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector on a 2007 Jeep Wrangler Unlimited
    You do not have to drill into the vehicle frame to attach the ground wire. Making it a little longer to reach a hole or attaching it to an existing bolt in the frame will work just fine. Just make sure that it is attached to a clean and corrosion free bare metal surface and that if you lengthen the wire make sure to seal of the splice with electrical tape or liquid electrical tape # SWC50122.
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  • Troubleshooting Trailer Running Lamps Not Working After Replacing 7-Way Trailer Connector
    To determine if the problem lies in the vehicle or the trailer wiring, use a circuit tester like # PTW2993 on the pin in the 11:00 position on your 7-way while the vehicle headlights are on. If the pin shows voltage on it, the problem exists somewhere in the trailer wiring. If you don't get any power on that pin, the issue is with the wiring on the vehicle. If the running lamps on the vehicle aren't working, check fuse # 17 in the fuse box under the driver's side dashboard. If they are...
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