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Mighty Cord Trailer Connector Adapter - 4-Way Flat to 7-Way RV Style - 12" Long

Mighty Cord Trailer Connector Adapter - 4-Way Flat to 7-Way RV Style - 12" Long

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Trailer Wiring A10-7084VP - Single-Function Adapter - Mighty Cord
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Convert your vehicle's 4-way to a 7-way with this wiring adapter. Flat, 4-pole connector plugs into your vehicle and additional wire leads pull 12V power for accessories and send signals for the electric brakes and auxiliary or reverse. Great Prices for the best trailer wiring from Mighty Cord. Mighty Cord Trailer Connector Adapter - 4-Way Flat to 7-Way RV Style - 12" Long part number A10-7084VP can be ordered online at or call 1-800-496-5010 for expert service.
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  • Reviews (97)
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Mighty Cord Trailer Wiring

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

Convert your vehicle's 4-way to a 7-way with this wiring adapter. Flat, 4-pole connector plugs into your vehicle and additional wire leads pull 12V power for accessories and send signals for the electric brakes and auxiliary or reverse.


  • Adapter converts the 4-way flat trailer connector on your vehicle to a 7-way RV-style connector
    • 4-Way flat trailer end plugs into the 4-way flat on your vehicle
    • 7-Way RV-style connector plugs into the 7-way on your trailer
  • Additional wire leads for 12V power, electric brake function, and auxiliary or reverse function
    • Blue wire connects to your brake controller to send braking signal to your trailer's electric brakes
    • Black wire pulls 12V power from your vehicle's battery to help maintain the trailer battery or power accessories
    • Yellow wire sends the signal to your trailer to activate the reverse light or an auxiliary circuit
  • Spring-loaded dust cover protects the 6-way connector from moisture and debris


  • Harness length: 12"
  • Wiring configuration:
    • Green (4-way): passenger side brakes/turn signal
    • Yellow (4-way): driver side brakes/turn signal
    • Brown (4-way): tail lights
    • Blue: electric brakes
    • Black: battery
    • Yellow: 12V power supply or auxiliary
    • White: ground
  • 1-Year warranty

A10-7084VP Mighty Cord 4-Pole to 7-Pole Adapter Plug - 12" Harness

Item # A10-7084VP

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Customer Satisfaction Score:

Customer Reviews

Mighty Cord Trailer Connector Adapter - 4-Way Flat to 7-Way RV Style - 12" Long - A10-7084VP

Average Customer Rating:  4.7 out of 5 stars   (97 Customer Reviews)

Convert your vehicle's 4-way to a 7-way with this wiring adapter. Flat, 4-pole connector plugs into your vehicle and additional wire leads pull 12V power for accessories and send signals for the electric brakes and auxiliary or reverse.


Easy install no instructions that could really help but my ZCI install prior assisted in getting it done .


Great product - super easy to install and has worked perfectly for over a year - recommended! etrailer has great service and the best prices around on this stuff - my go-to for trailer parts.


The 4-pin to 7-pin adapter doesn't work. I'll have to fix the wiring. None of the trailer lights work. The ground in the 4-way cable was clipped. The outside ground wire was the only one connected - not what I wanted/needed. I had to replace the flat 4-wire connector to get the wiring I wanted. I expexlpected a flat 4-wire connector to round connector adapter. That isn’t what was delivered.

This adapter is designed to make it easier to hardwire a 7-way plug with all of the functions on your vehicle if you already have the 4-pole flat. If you only needed the 4-pole flat functions, you can simply ground the white wire and tuck the other wires away.
-- Etrailer Expert Heather A - 10/12/2021


It works perfectly


Plug and play! Very easy to install on our Santa Fe. Works as described, and has performed well for one year so far.


this is prefect addition for a person with multiple trailers.


Simple to use. Exactly what I needed


I ordered this product for my 97 Chevy 1500 Pickup. I use it to haul a two horse trailer made in 2007 with new plug adapter. I am female and know absolutely nothing about vehicle/trailer wiring. Hooked it up, everything worked great. Did not have to change a thing. The 97 Chevy is my farm truck and is not used very often. Did not have to touch a thing, plugged right in and went on down the road. Fast shipping.

Still works great!
Jennifer L - 07/24/2017


A very nice, high quality, well-made product, except when I had trouble with lights working, I traced the white ground wire from the 4-pin flat plug, inside the plastics wire wrap, and discovered that it stopped half way inside the wrap — it was not connected to the ground in the round 7-pin plug. It relied on the separate white grounding pigtail to the 7-pin round for the ground.
I spliced the White from the 4-pin flat plug, into the white pigtail to the 7-pin round, sealed and rewrapped it, and now I have continuous ground between the flat 4 and the round 7. Now I have plug-in ground from 4 to 7.


For this adapter to work, for me, I had to disassemble the plug and connect the "Flat Four" ground to the 7 pin plug. Logically if you have a flat four plug you are not going to be running trailer brakes and don't need the hard ground. As it was sold the lights don't work, which is all I needed. My connector runs direct to my truck harness. I don't leave this adapter connected. When I tow the trailer, in question, I plug in the hitch, this harness adapter and go. When done I unplug the harness adapter, the hitch, and throw them back in the truck.


I boat a boat that came with a trailer that had the 7 way round trailer plug, which of course doesn't work with my 4-way flat plug on my Jeep that I use with my other boat. So, I went by the big [trailer rental] store in town to buy an adapter. However they only had adapters that assumed the round plug was on your vehicle and the 4-way flat was on the trailer and I had the exact opposite problem. So, I went to [big online retailer] where I usually can find most anything and they didn't have an adapter either.

A Google search found and they had exactly what I needed. I ordered it and had it a few days later. I was a little apprehensive when I hooked it all up, but it works flawlessly! Now I can easily hookup either boat and I avoided having a second connection installed or modifying one of the trailer plugs. I'm very satisfied with a solution that cost much less than either of my alternatives!


Great product, awesome price!
This adapter
allows me to use my 18ft utility trailer with my 4Runner with light loads so I do not have to get out my big truck, which saves me alot of hassle!
The 4Runner has a 4 flat connector and my trailer has the 7 round...perfect marriage of utility and convenience!
I deducted one star only because there are no diagrams for the extra four wires. (B+, Brakes, Aux and Ground) Granted, it easy enough to ring out with a multi meter and I will not even be using them...however, they should still be identified either on the wiring or package labelling.
Still, fantastic solution and under $20!


I have installed the connector on my Cadillac XT5. I had the 4 plug connector already installed with a blue wire for un-locking the solonoid on the brakes then I installed all wires to match the colors of the 5 & 7 pole. I cut out a hole in the plastic bumper cover and installed the connector with four screws.

You could make a new product like this one for the Cadillac XT5 connectors for all boat trailers, this is an easy hook up to the XT5, SRX, and other GM cars. I now use the round type 5-7 pole connector for my boat trailer to lock out the brakes when backing up my trailer.


I think this will work nicely for what I have in mind. My plan is to relocate my car hauler from my home in Arizona to my home in California. The trailer weighs in at 2,000 pounds and my 2010 explorer has a tow rating of 3,500 pounds. The car hauler has electric trailer brakes on it that I will not need when I haul it empty. So I bought this adapter which will allow me to use all the light functions without the trailer brakes. This will save on fuel costs for the big truck to stay at home this time. Thank you for all you do!


Made converting my 2011 pathfinder from 4 flat to 7 round very easy.
The one I ordered was delayed, and they gave me a substitute that was even cheaper.
Great company.

No issues at all. Everything still good
William - 06/01/2020


I have an older truck with simpler connector and no trailer brake controls, and a newer truck for the robust brake connector. After extensive internet searching for an adapter, I again came to and ordered/received a robust part that works great.


I can always find the products I need, at the best prices, on The items I purchased were shipped the same day, I promptly received emails about order status and tracking, and the items always arrived on-time, quickly, and in great condition (even the hitch). Etrailer is now the first place I go to look for towing equipment.


The Website is very easy to use. Looking up what you need is difficult on any site because you have to enter the correct description of what you need. I appreciate the quality of the products. I really appreciate the descriptions and help videos. Everything I need in one site. The pricing is very competitive and shipping is fair. With this connector I can add the brake controller with ease. Thank You!


It fits... but please tell me what bracket I need now to actually mount the device to my Jeep JKU. Would have been nice to know in advance instead of wasting another week waiting for another part.

Mighty Cord recommends the # A10-9394VP
Mighty Cord Universal 7-Way Mounting Bracket
bracket. The bracket is typically best mounted to the underside of the bumper.
-- Etrailer Expert Mike L - 06/10/2019


I choose this particular cover because here in Iowa we have every kind of weather - sunny & hot, rainy & humid, cold & snowy, and usually windy. The Adco tyvek cover has done well so far on my Aliner hardside popup, as it breathes well enough that the camper has always stayed dry inside. I project 3 years use before replacement, and will replace with same model.


In this day and age of scams, baseless promises, and much less than quality products and misleading web sites boasting of claims never realized, it has been an extreme pleasure doing business with etrailer. The Mighty Cord Trailer Connector Adapter was exactly what was displayed on the web site and the quality of the connector was "top of the line". Shipping was just as stated and efficiently shipped at a very reasonable cost. To say the least I am very pleased with etrailer service and their products. I highly recommend doing business with this firm. Ted Johnson


Lighting harness has worked perfectly and the installation video specific to my vehicle was top notch. etrailer is great at what they do and provide!


Works like a charm. As usual etrailer only offers great products at fair prices with excellent service


Just what i needed in a timely manner.


Received notice of shipment of wiring harness about 4 hours after placing the order. Wiring was easy to install on Tacoma for lights on trailer. Parts appear to be of good quality and only took about 30 minutes to hook up.

Show More Reviews

See what our Experts say about this Mighty Cord Trailer Wiring

  • Is it Totally Necessary to Connect Ground Wire of Mighty Cord Trailer Connector Adapter
    There is a ground wire that is present in just the 4-way section of the # A10-7084VP which will be for just the trailer wiring and an additional ground wire for the other three circuits if ever active. If at all possible I would recommend attaching the white ground wire as well but you should have no problem activating just the lighting without connecting it.
    view full answer...
  • Can 7-Way to 4-Way Adapter A10-7084VP be Used for Just Trailer Light Function
    For what you are looking to do the part # A10-7084VP will work just fine. You would plug your vehicle's 4-way into the adaptor's 4-way and then plug straight into the 7-way of your trailer and all of the trailer lights will function. You could tape up the extra wires as they aren't needed or you could cut them off.
    view full answer...
  • Installation of Brake Controller on 2016 Ford Explorer
    To install a brake controller on your 2016 Ford Explorer, if you have the factory 4-flat you will need to hardwire the rest in. I am not certain which brake controller you have specifically but the black wire is generally the power wire and run to the positive post of your battery through a 20- or 30-amp circuit breaker, and you also want to connect the blue wire coming out of the brake controller to the brake wire and the red wire from your controller will be what you connect to the wire...
    view full answer...
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  • Can a Vehicle with a 4-Way Tow a Trailer with a 7-Way
    Correct, a 4 to 7-way adapter will allow your friend to tow the trailer. The lights will function therefore making it legal to drive but the brakes would not be able to be engaged without a brake controller. The best and most cost effective solution would be to use part # A10-7084VP on the vehicle therefore no alterations will need to be made to the trailer or vehicle. Once you plug the male 4-way on the adapter into the female 4-way on the vehicle, there will be 4 wires remaining. The...
    view full answer...
  • Wiring Mighty Cord 4-Way to 7-Way Adapter on Tow Vehicle
    The Mighty Cord Trailer Connector Adapter # A10-7084VP referenced in your question is exactly what you need to connect the 4-Way flat on your tow vehicle to the 7-Way on your trailer. After plugging the 4-Way on the adapter to the 4-Way on your vehicle, the only wire that NEEDS to go somewhere is the white ground wire, which you will securely attach to a bare metal surface on the vehicle's frame. The additional black, blue, and yellow wires can be simply taped off if you don't need them....
    view full answer...
  • How to Add 7 Way Trailer Connector to Vehicle with 4 Way Connector
    I have a solution for you, but there is not a true adapter for a vehicle with a 4 way connector to adapt to a trailer's 7 way. You will need to install a 7 way connector to your tow vehicle using the existing 4 way connector and something like the Mighty Cord Trailer Connector Adapter - 4-Way Flat to 7-Way RV Style - 12" Long # A10-7084VP. You'll plug your vehicle's 4 way into the 4 way vehicle end on the Mighty Cord and then make connections for the remaining needed functions for your...
    view full answer...
  • 4-Way to 7-Way Adapter Recommendation for 2016 Jeep Wrangler Unlimited
    7-Way sockets are a bit bigger and heavier than 4-way sockets so they are mounted to the vehicle so that they don't sag. If the 4-way on your vehicle was longer than typical you could mount the 7-way of the adapter part # A10-7084VP to the trailer frame and have the 4-way portion reach accross. Otherwise mounting the # 37185 is your best option.
    view full answer...
  • 7-Way Running Light Circuit Powered On With Lights Off on 2015 Kia Sorento
    The diode should not have anything to do with it, and there are only a couple of possibilities I can think of. First things first, check the ground of the connector on your '15 Sorento; it is common that a bad or insufficient ground can cause the issue of one of the functions bleeding through and continuing to have power. Another potential issue is there may have been some corrosion on the 7-way of your Kia Sorento, and that corrosion bled to the inside of the 7-way on the running light...
    view full answer...
  • Which Wire of Mighty Cord Trailer Connector Adapter # A10-7084VP Is for Charging Battery
    The black wire of the 7-way adapter part # A10-7084VP that you referenced is normally the circuit associated with charging a trailer battery. That said the yellow wire could be too as long as you wired up the trailer to match. From the adapter to your vehicle battery you will need to run 10 gauge wire like part # 10-1-1 (sold by the foot) through a breaker like part # 9510.
    view full answer...
  • Recommended Parts to Add 7-Way Trailer Wiring to 2018 Toyota Highlander Hybrid
    For your 2018 Toyota Highlander, because you already have the 4-way trailer connector and don't want the brake controller wiring, you simply need to add the Mighty Cord Trailer Connector Adapter # A10-7084VP. Installing this adapter means connecting to your current 4-way and then connecting the white ground wire with the ring terminal to a bare metal connection to the frame or frame mounted panel. Then to add the 12V power, you will use wire # 10-1-1 sold by the foot and connect it...
    view full answer...
  • How to Add 7-Way to 2018 Subaru Outback
    If you are looking to add a 7-way to your 2018 Subaru Outback in order to utilize a brake controller you will first need to install a 4-way with Wiring Harness with 4-Pole Flat Trailer Connector # 118467 (although there is not a fit for the Sport model of Outback). After adding the 4-way you will need to install the Universal Installation Kit for Trailer Brake Controller # ETBC7, which will give you the hardware you need to install a brake controller, including circuit breakers, wiring...
    view full answer...
  • Recommended 4-Way Trailer Wiring Harness for 2014 Honda Odyssey Touring with 7-Way Adapter
    For just the 4 way and the adapter for your 2014 Honda Odyssey Touring, I recommend the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56378 which will install behind the driver's side trim panel in the rear cargo area. You will install the 10-amp mini fuse and two 7.5-amp mini fuses in the rear fuse panel. I've attached the installation details to assist. Then for your 7-way plug with only the 4-way functions, you only need the Mighty Cord Trailer Connector...
    view full answer...
  • How to Tow a Trailer with a 6/7-Way Trailer Connector on a 2016 Toyota Highlander
    The Mighty Cord Trailer Connector Adapter part # A10-7084VP would work for you if the trailer has a 7-way trailer connector. However, if it has a 6-way trailer connector like you mentioned then you would want to use the Mighty Cord Trailer Connector Adapter part # A10-6034VP instead. Please keep in mind that both 6 and 7-way trailer connectors are used for trailers with brakes. If your trailer has brakes then the better option for you would be the Universal Installation Kit for Trailer...
    view full answer...
  • Trailer 7-Way to Car 4-Way Adapter Plug
    Yes, I have a solution for you. You can use the Curt # C57672 7-way to 4-way adapter. Your 4-way plugs into the back of it and wiring is included for additional connections. These are usually for trailers that have a 7-way plug but only need lighting. I have included a link to this product, and a link to a video that explains the connections and install. This product would be good for trailers that do not require a 12v charging line or electric trailer brakes. If you want to pull...
    view full answer...
  • Comparing 4-Way to 7-Way Adapter and ETBC7L Kit
    The main difference is just what you said, the # A10-7084VP is only the adapter and the # ETBC7L includes the bracket, connectors, a circuit breaker, and 20 feet of wire. The other significant difference is the adapter included with # ETBC7L has a 4-way and a 7-way so you don't lose the existing 4-way on your vehicle which is important to some people. It's similar to part # C57672 which also includes the bracket but not the other parts of the # ETBC7L
    view full answer...
  • Can 4-Way be Spliced Into Trailer That Has 7-Way
    If you don't want to use a vehicle adapter like the Mighty Cord Trailer Connector Adapter - 4-Way Flat to 7-Way RV Style # A10-7084VP on your vehicle with a 4-way to adapt it to your trailer's 7-way, then yes, you can splice into your trailer's wiring to add a 4-way if your like. You can use the trailer side connector you mentioned, the Hopkins Endurance Easy-Pull Harness with 4-Pole Flat Trailer Connector # HM38136. To splice it you can connect your wires with the Deka Heat Shrink Butt...
    view full answer...
  • 7-Way Trailer Connector for a 1999 Ford Ranger and Battery Charger for a Camper Trailer
    It sounds to me like you are trying to attach a camper with a 7-way trailer connector to your 1999 Ford Ranger with a 4-way trailer connector. If this is the case then you would want to use Mighty Cord Trailer Connector Adapter part # A10-7084VP. However, if your trailer has brakes then you will need to install the Universal Installation Kit for Trailer Brake Controllers part # ETBC7 along with a trailer brake controller such as the Hopkins Agility Trailer Brake Controller part # HM47295. Both...
    view full answer...
  • Recommended 7-Way Mounting To Hide Wiring Connections
    For the Mighty Cord Trailer Connector Adapter # A10-7084VP and your Curt # C13182 trailer hitch, I recommend the 6 and 7-Way Trailer Connector Mounting Box for Round or Square Tube Hitches # 18159 along with some simple zip ties like # 853-3194-02. This will allow you to keep the connections hidden and also keep the wiring on the back side of the hitch or tight under the frame.
    view full answer...
  • Will Trailer Brakes Function By Adding 4-Pole to 7-Way Adapter A10-7084VP
    A wiring adapter such as the Mighty Cord 4-pole to 7-way # A10-7084VP will let you change the trailer connector format from one to the other but by itself it does not add the functionality of a trailer brake controller. To have trailer brake power you still need a brake controller unit. The adapter has three pigtail leads, yellow, blue and black, with butt connectors. These allow you to make the additional circuit connections for 12V auxiliary power, brake controller output and reverse...
    view full answer...
  • Converting a Trailer with 7-Way to Vehicle with 4-Way
    If the vehicle has a 7-way trailer connector and the trailer has a 4-way trailer connector then you can use the Pollak 7 Pole to 4 Way Connector Adapter part # PK12716 to attach them to one another. However, if the vehicle has a 4-way trailer connector and the trailer has a 7-way trailer connector then you can either use an adapter like the Mighty Cord Trailer Connector Adapter part # A10-7084VP or you can just cut off the 7-way on the trailer and install the Hopkins Endurance Quick-Fix...
    view full answer...
  • How to Mount 7 Way to 2019 Subaru Outback With Hidden Cross Tube Hitch
    I understand the frustration, manufacturers are making hitches more hidden and sleek. It's nice having the cross bar hidden, but it does make it challenging to mount wiring because that's the traditional spot. You can route the 4 pole wire out to the bumper through a grommet that is under the spare tire. I have done that many times to get the wires out towards the hitch, you'll just want to make sure the wire is protected and to seal the grommet up with some silicone # LT37467. You can...
    view full answer...
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  • Wiring for Curt Echo Mobile Wireless Brake Controller and Adding Electric Brakes to a Trailer
    The Curt Echo Brake Controller part # C51180 is a great choice because of its convenient and simple installation. The 7-way connector that you mention part # A10-7084VP pugs into the 4-way connector you purchased part # C56217. The white wire from the 7-way plug needs to be grounded to a clean bare metal surface on the vehicle's frame. You are correct, the black wire from the 7-way connector needs to be extended from the plug into the engine cavity and to a 40 amp circuit part # 9510...
    view full answer...

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