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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
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Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector 4 Flat 30717
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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.
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Tow Ready Wiring - 30717

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


  • 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   (493 Customer Reviews)


- 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:

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:

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:

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:

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



- 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:

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



- 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:

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 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:

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 have posted reviews before but I really cant find any other words to more adequately express how pleased I am with etrailer. Of course, the products are top notch. But the service before, during and after the sale is the best part of my experience. Truthfully, you may find a better price elsewhere on the internet (not often though), but I can assure you that better service and dedication to customer satisfaction cannot be found anywhere else! 668826



- 30717
by: 10/07/2020

898586



- 30717
by: 10/05/2020

Does what you'd expect it to do. Got the product fast. 897216



- 30717
by:

Worked Great just what I needed and you had it. 896270



- 30717
by:

Every time etrailer has provided me with the needed wiring! 893843



- 30717
by:

Looks like a quality product. Will know more in a few weeks when I try it out. Ordering was easy and delivery was sooner than promised. A great experience as it should be. Thank you. 883878



- 30717
by:

We selected this when a standard wiring kit would not work with our vehicle. My husband installed it himself although he had do some modifications for our vehicle. Seems like it would work great for a temporary trailer system but we were looking for something more conceled. Works great and we have had not difficulties with operation, just placemnt and looks. 881524



- 30717
by: 09/11/2020

good 877053



- 30717
by:

872828



- 30717
by:

Did exactly what it was supposed to do, it worked. 869729



- 30717
by:

Brad was extremely helpful and courteous! Shipping was expedited and I received the product I ordered in a few days. Would definitely recommend etrailer to all my family and friends! 860940



- 30717
by:

Exactly what I ordered just not in time for trip had to make other arrangements. Max of three day delivery took 7 days. 859814



- 30717
by:

Worked as expected. Plastic is a little cheap. 859773



- 30717
by:

856391


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Show More Reviews

Ask the Experts about this Tow Ready Wiring

  • 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...
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  • Plug and Play 7-Way Trailer Connector for 2018 Ford F-150
    To install a 7-way on a 2018 Ford F-150, you'd use the Curt # C56413 which installs as shown in the linked video.
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  • Easy to Install Brake Controller Recommendation for 2017 Toyota Highlander with 4-Way
    I have a perfect brake controller solution for what you are wanting that is super easy to install and also performs really well. For that I highly recommend the Curt Echo Mobile part # C51180 as this basically just plugs into an active 7-way which I have an easy solution for your 2017 Toyota Highlander and once synced to your smart phone is ready to be used. It offers proportional braking which means it senses how hard you are applying the brakes of your Highlander and applies the trailer...
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  • Where to Find Brake Output Circuit of 2006 Ford F-150 with 4-Way
    You have to look at the driver side frame rail for the wiring needed to connect to the blue wire of the # 30717 that you have. I attached a couple pictures that show what you are looking for.
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  • prodigy Brake Controller Shows Dot, Locks Trailer Brakes After Breakaway Activates Trailer Brakes
    It sounds like there may be a short on the blue wire. With the trailer connected to the tow vehicle use a circuit tester such as # 40376 to test the blue wire behind the controller. If it shows power then disconnect the trailer. If it still shows power, sever the blue wire from the back of the controller and test the end coming out of the controller. If it still shows power at idle and not just when using the manual override then there is an internal problem and the controller will need...
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  • 4 pole to 7 adapter 2008 Toyota Sienna
    The ground (white wire) definitely needs to be hooked up for your vehicle to power the lights on the trailer. You need to make sure the ground is mounted to a clean metal surface for a good connection. The black wire does not need to be hooked up if you do not have brakes or a battery to be charged while towing. Usually the extra black wire is for charging the trailer battery, the blue wire is for brakes and the heavy yellow wire is for auxilary power. You do not need to hook these...
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  • Can Redarc BCDC Charger Be Used with 7-Way Connector to Charge Trailer Battery
    The Redarc In-Vehicle BCDC Battery Charger # 331-BCDC1225D that you referenced could physically be installed so that it uses 12V power from the 7-Way connector on your truck, but it's not going to allow for ideal operation. The problem is that typical trailer connectors use smaller 10 gauge wiring that just isn't capable of allowing enough power to pass through to really charge a battery up. Since this is exactly what you would want to use the BCDC charger for, using it with the 7-Way...
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  • How To Install a 7-Way Trailer Connector On a 2016 Honda Odyssey
    I have exactly what you need to add a 7-way trailer connector to a 2016 Honda Odyssey. For this, you'll need to start with a 4-way trailer connector and I recommend the T-One Vehicle Wiring Harness part # 118521 which is plug-n-play. Then you can convert this to a 7-way using the 7-Way RV Upgrade Kit for Trailer Brake Controller Installation part # ETBC7L. The 7-way is easy to install; just plug the two 4-ways in, ground the white wire, then run the black wire up to the battery but that's...
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  • Recommended Wiring Connection Adapter for Jeep 4-Pin to Trailer 7-Pin
    If all you want to do is go from the 4-way trailer connector to the 7-way without adding functions, all you need to do is use an adapter like # 30717. You will simply plug in the 4-way and then connect the white ground wire with ring terminal to your vehicle frame. The ground needs a bare metal to metal connection free of debris and corrosion. The other three wires on the adapter can be left disconnected. The only thing to double check since you have a boat trailer is that you don't...
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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.
    view full answer...
  • Brake Controller and 7-Way Installation in 1994 Ford F-150
    To install a trailer brake controller like the Prodigy P2 # 90885 or P3 # 90195 along with a 7-way socket in your 1994 Ford F-150 the parts you'll need depend on how the truck was equipped from the factory. If it did not come with a factory 7-way then you will need our install kit # ETBC7 as well as a 4-pole wiring harness like # 118316. If you already have a 4-pole and 4-to-7 adapter part # 30717 then all you need is the controller and a wiring kit to connect everything, part # 5506....
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  • Installing a 7-Way Connector in a 2000 Chevy Express Van
    To hard wire your 2000 Chevy Express Van with a 7-Pole connection, first, you will need Tow Ready Custom Fit Vehicle Wiring, # 118377. I have included a link to the instructions below. Basically, you plug in this wiring harness into a taillight connection and run the wires where needed (to the other taillight and then to the rear of the vehicle). With that installed, you will then add Brake Controller 7 and 4 Way Installation Kit, # ETBC7, which will provide you with the 7 pole connection...
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  • Where Do the Extra Wires of the 4-Way to 7-Way Adapter 30717 Run To
    The additional wires of the 4-way to 7-way adapter # 30717 are white for ground, yellow for reverse light or auxiliary, blue for brake output, and black for 12 volt accessory. To activate each of these circuits only requires you to run the wire to the proper location. The blue wire runs to the blue wire of your brake controller. The black wire runs to the positive post through a circuit breaker like part # 9510. The yellow wire would need to tap into the power wire for the reverse lights,...
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  • 4-Way to 7-Way Adapter Recommendation for Jeep Wrangler for Charging Trailer Battery
    The part # 30717 would be exactly what you would need to start with to install a 7-way on your Jeep Wrangler that has a 4-way. You would need to ground the white wire and then run the black wire up to the positive post of the battery using 10 gauge wire like part # 10-1-1 (sold by the foot) through a breaker like part # 9510. If parked for a short period of time your vehicle battery would not get drained but if you planned to park it over night and your trailer battery was pretty weak...
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  • 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...
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  • How To Add Tekonsha Brake Controller To 1999 Lexus LX470 With Factory Tow Package 4-Way Connector
    My research shows that the tow package for the 1999 Lexus LX470 includes the receiver hitch with the wiring harness for a trailer hook-up which is the 4 pin connector that you see. Since your LX470 did not come with a factory installed 7-way trailer connector, neither the wiring harness nor the plug will be there so there is nothing to find. You will be installing all the wires needed for a brake controller and power yourself. Because your LX470 already has the 4 pin connector all...
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  • Can I Use 7-Way Female Plug On My Trailer With 7-Way To 7-Way Male Adapter
    It is possible to use a a female 7-way plug on the trailer if you wanted to using part # 30717 and then using an adapter Bargman 7-Way Molded Trailer Wire Connector - Double-Ended part # 50-67-210 to connect the two plugs. As long as you wire the female plug to match the wiring functions of your vehicle side you won't have any issues. However the adapter would need to stay with the trailer if you ever wanted to tow it with another vehicle because most trailers have a male end connector...
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  • How to Wire a 4 Pole to 7 Pole Adapter
    We need to figure out why the trailer lights are not working. Use a circuit tester on your 4-way flat that you plugged into the back of the 4 to 7 pole adapter and test each function to make sure they are working correctly. If your 4-way is working properly, then you can plug it back in and test the corresponding poles inside the 7-way connector to be sure the adapter is working properly. If you need a circuit tester, we have part number 40376. Next, you would have to plug in the trailer...
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  • 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...
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  • How to Determine the Amperage on the 12 Volt Power Circuit in a Trailer Connector
    The amperage on the 12 volt power circuit will depend on the amperage draw of the item receiving the power on the trailer. When aftermarket 7-way trailer connectors are installed on vehicles, it is recommended to have a 40-amp circuit breaker inline on the power wire going from the trailer connector to the battery. If your truck has factory trailer wiring, there will be a fuse in the fuse box designated for that circuit. You can check your owners manual to see the names and locations...
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  • 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...
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  • How to Wire a 7-Way Trailer Connector on a Toyota Highlander Hybrid
    In order to provide a maintenance charge through the 4 Pole to 7 Pole Adapter, # 30717, you will need to connect the black wire on the adapter to the vehicle positive battery terminal via a 40 amp circuit breaker, # PK54540. You will also need to make sure the white ground wire on the adapter is connected to the vehicle frame. The wiring from a 7-Way will provide a maintenance charge to a trailer battery but will not fully charge it. You will also need about 20 feet of wire # 10-1-1....
    view full answer...
  • Options for Installing 7-Way Trailer Connector on 2004 Ford F150 Equipped with 4-Pole
    Although the # 30717 will work, I have a better suggestion for you. If your F150 is the New Body style, use part # 118247. If you have the Old Body style, use # 118242. Either connector will plug inline with your existing trailer connector, allowing you to retain the function of your existing 4-pole. Either kit includes the necessary fuses and relays to activate the remainder of the tow package circuits. Granted, this is a more expensive option, but it will be a very quick and easy plug-and-play...
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  • Can a 4-Way to 7-Way Adapter be Installed on a 2017 Chevy Camaro
    Trailers for watercraft items generally use either a 4-Way flat or 5-Way flat trailer connector. But if yours has a 7-Way blade style connector on it AND your 2017 Chevy Camaro already has a 4-Way flat connector on it then # 30717 could be used. The white wire would need to ground to the vehicle frame. The black wire is for 12 volt power if the trailer requires it, blue is for electric brakes if the trailer has them, and yellow is for reverse lights if needed. To make all of those things...
    view full answer...
  • How To Wire A 1998 Allegro Motorhome And Tow Dolly For A Brake Controller
    The brake controller I would recommend for your 1998 Allegro motor home is the Tekonsha Prodigy P2 Proportional Brake Controller, part # 90885. The Prodigy 2 brake controller is our best selling model. It can be mounted in a 360 degree vertical range and will level itself automatically. It is a proportional brake controller which means that the brakes are applied to the tow dolly at the same time and same strength as the brakes on your vehicle. I am including a link to the installation...
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  • Recommended Trailer Connector and Wiring to Add 7-Way Trailer Connector to 4-Way for Reverse Lights
    For your reverse lights on your boat trailer, I recommend you start with converting the 4-way you have into a 7-way trailer connector. I recommend the Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector # 30717 for this. You will simply plug in your current 4-way and then connect the white wire with the ring terminal to your frame bare metal to metal using # FA1131822. Then you will connect the yellow wire of this adapter to the reverse light power at your tail light on one side of...
    view full answer...
  • Connection of Reverse Lockout Circuit to 7-Pole Vehicle End Trailer Connector
    The Center pole on the 7-Pole connector, item # 30717, will be connected to the yellow wire. If your trailer uses the center pole for the reverse lockout on your hydraulic surge brakes then you will connect the heavier yellow wire to the reverse circuit behind the vehicle taillights. You will need to use a circuit tester, item # 40376 if you need one, to find the correct wire to splice into. The blue wire on the 7-Pole connector is for electric brakes and is normally ran to a brake controller,...
    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...
    view full answer...
  • Replacement OEM 7-Way Trailer Connector for 2008 Honda Ridgeline
    I believe the 7-way on your Ridgeline plugs into a US car connector. You can check this by unplugging the damaged 7-way connector from the wiring harness that plugs into the back of it, and comparing what the connector looks like, compared to the left-hand panel in the photo I've provided for you. If they match, you can use the # HM40975 as a replacement for your 7-way. We don't have the OEM Honda part, but this connector will provide you with a functional 4-pole, as well as the 7-way....
    view full answer...

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