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Transform your vehicle's 4-way flat system to a 7-way RV-style connector with ease using this adapter. Whether you're hauling your pop-up RV or your utility trailers, this adapter grants you the flexibility to connect different trailers without altering your vehicle's wiring setup. With an uncomplicated plug and play design, connecting your trailer lights and signals becomes a breeze, ensuring a stress-free towing experience.
Need to power your trailer accessories during your journey? This adapter seamlessly integrates with your existing setup to draw 12V power straight from your vehicle, ensuring your trailer’s battery stays charged, or providing power to auxiliary circuits. Enjoy the convenience of signaling reverse lights or additional auxiliary functions with the straightforward connection of a yellow wire to your reverse light system.
Designed to withstand the rigors of outdoor use, this adapter features a spring-loaded dust cover that shields the terminal from moisture and debris. It's an essential feature for those who need reliability in varying weather conditions, preserving the integrity of your connection and ensuring consistent performance.
For those towing trailers with electric brake systems, this adapter is a game changer. It includes a blue wire that connects directly to your brake controller, transmitting the critical braking signals needed for safe, controlled stops. Experience peace of mind knowing your trailer’s brakes are as responsive as your vehicle’s.
With a 12-inch harness length, this adapter is designed for easy installation and versatility, fitting snugly into most configurations without excess cable clutter. It's engineered to provide the perfect balance between flexibility and reach, making it simple to connect in tight spaces or awkward angles.
Ensure consistent and reliable signal transmission with the integrated white ground wire, which needs a firm connection to a metal surface on your vehicle. This crucial feature supports all essential light functions, like running lights, brake lights, and turn signals, making certain your trailer's signals are visible and compliant at all times.
California residents: click here
I added it to my trailer, so when in camp I could have the running lights on without the truck.
You guys are great, professional, keep it up
Fits great easy install
Knowledgeable salesman, the best of the best.
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 my second order with etrailer. Both experiences with your company have been very positive. The knowledge and friendliness -along with following up on orders and satisfaction have been much appreciated. Brittany, the customer representative, is a huge asset to etrailer.
Very impressed. Great packaging. Will order again.
Works well fit perfectly in the factory bracket
Just 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.
Jennifer L. 
7/24/2017
Still works great!
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.
Heather A.
10/12/2021
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.
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.
Exactly as described and what I needed. Delivered quickly.
Raymond
4/17/2024
Perfect. The 4 way to 7 way plug works just like they said it would.
I think it’s
What I needed
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.
William
6/1/2020
No issues at all. Everything still good
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 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 etrailer.com 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!
Quick and simple. Able to retain original plug and added a seven way
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!
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
I can always find the products I need, at the best prices, on etrailer.com. 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!
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!
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Brooke M.
4/15/2025
Thank you, Duane. We will strive to!