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When your truck and trailer don’t share the same 7-way connector style, this adapter bridges the gap. The Brophy Custer Trailer Connector Adapter w/ Dust Cover (part # F77R) plugs into a vehicle’s RV-style 7-way blade socket and provides a 7-pole round pin connection for the trailer. It’s a simple plug-and-play fix that gets you towing without rewiring or replacing connectors.
This adapter is built with a sturdy plug and lead design that holds up under constant use. It fits snugly and stays connected, even on rough roads or when pulling heavier trailers. The firm connection keeps your lighting and brake signals working reliably from truck to trailer.
Keeping your terminals clean matters for long-term performance. The built-in dust cover shields the round socket when not in use, keeping out moisture and debris. That protection helps maintain strong electrical contact every time you hook up your trailer.
Whether you’re towing a utility trailer, camper, or equipment hauler, this universal-fit adapter handles the job. It lets you connect gear with different wiring styles without modifying either end, making it a handy piece to keep in the toolbox for any towing setup.
Customer Satisfaction Score:
97% were satisfied with this product
3% of customers were not satisfied
Ratings & Reviews
Nice item.
Product showed up in a couple of days and works exactly as advertised , I couldn't of been happier with the whole experience.
GREAT SERVICE GREAT PEOPLE TO DEAL WITH WAITED A LITTLE LONG FOR THE PART BUT OTHERWISE GREAT PRODUCTS THANKS AGAIN STEVE
Was exactly what I wanted. The pictures online made it easy to identify the correct product so it was great to get the right part the first time and on time.
Works great, Had to switch a few wires other than that works perfrect.
Works exactly as intended. I don't use it a lot, but I am happy with it.
Useful adapter
Just what was needed
worked fine. was very well made. i used it to pull my Deere baler with the ton truck to the dealer for repair. it'll be on hand for many years for that use.
Good product
Works perfect for 7-round to 7-flat.
Looks Heavy-Duty. We'll see how wiring matches-up!
We have ordered 2 of these for our shop and love them. great quality not cheaply made. great customer service and fast delivery.
Best adapter for the money. I am using it on farm equipment, so i can have lights when I tow with my truck.
Been looking for this application locally for a while. Happy to find it here. Haven't used it yet but it looks well made.
I placed two orders recently. The website is organized and I was able to find what I needed. I spoke with Customer Service and they were nothing but helpful. I will definitely use them again.
Worked as listed. E-trailer has provided yet another good product delivered on time. Thanks
Worked perfectly. Nice for towing farm equipment with a normal common plug from truck. Works great on my Ford trucks.
Product didnt work for my application even after talking to a tech and explaining what i needed after i returned the original i ordered so yeah good luck
Worked well as adaptor from Great Plains no till drill wiring harness to use on truck.
Received quickly, worked with brake lights & turn signals, but not headlights or parking lights
Exactly what we were looking for. Customer service was great and found the right product for our application in a few minutes, shipping was quick. We are on the road with lights and no rewiring.
This product did not work. The diameter of the 7 pin receptacle plug was 1/8” narrower than my trailer plug. It fit perfectly into the 7 way blade receiver plug on my truck. I called customer service. She called manufacturer and manufacturer said there must be something wrong with my trailer plug. My trailer plug came standard on the trailer. Unfortunately no inside diameters are provided so one cannot measure before ordering. I am returning the product but was told I have to pay for shipping. etrailer has such a good reputation. I am really disappointed in this experience.
I have ordered several of these in the past from etrailer. Great product, quick shipping, an overall Great company to do business with.
Jeff K.
9/21/2017
Ive heard no complaints from our employees who use these.
etrailer is a great vendor and has always had in stock what we needed. Thank you!
Info for this part was:
At etrailer we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time.
Jenny N.
10/25/2021
I will have our customer service team reach out to you. This adapter is intended to work with most 7-way blade, RV-style trailer side plugs.