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When your tow vehicle and trailer use different 7-way plug styles, this adapter saves the day. The Custer Trailer Connector Adapter #ADP7R-7B has a standard 7-way blade female on one end and a 7-way round male on the other. It bridges the gap between the two connector types so you can hook up and tow without cutting or rewiring.
Instead of chasing wire diagrams or swapping plugs, this adapter just plugs in and works. The round male end connects to the 7-way socket on the vehicle, while the blade female end accepts your trailer’s 7-way blade plug. It’s a clean, solid connection that keeps your wiring intact and ready for the road.
This adapter is made strictly to change the connector style—it doesn’t convert signal types or combine separate circuits. If your setup already uses matching combined stop/turn circuits and a standard 12-volt charge line, it’s ready to go. You get a reliable physical connection between round and blade systems without adding unnecessary electronics.
Whether you’re pulling different trailers or switching between vehicles that use different 7-way formats, this universal fit adapter lets you move from one hookup to another with minimal effort. Keep it in your toolbox or glove box—it’s one of those small parts that makes a big difference when you need it most.
Customer Satisfaction Score:
97% were satisfied with this product
3% of customers were not satisfied
Ratings & Reviews
Dennis
2/9/2025
We hook a tractor to our flatbed gooseneck trailer to haul bales, nice to have lights and turn signals.
Robin H.
2/9/2025
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Wes
3/8/2024
This item has stood up well to heavy use and weather exposure over the last year since purchase !