6 Pin Round Trailer Wiring. Never seen an adapter like that. This contact occurs on medium duty trailers where you want both reverse lights and electric brakes.
I put this here because I had a hard time finding and figuring this out for my trailers. No need for multi plugs to tow various. This page has wire diagrams for many electric options including wires for trailer lights, brakes, alt power and connectors.
We also carry a number of other trailer wiring adapters.
This contact occurs on medium duty trailers where you want both reverse lights and electric brakes.
Find all of your trailer lighting needs at Menards from adapters to complete trailer wiring kits. Replaceable plug interior helps keep down maintenance costs. Here's the wiring diagrams showing the pin out for the plug and socket for the most common circle and rectangle trailer connections in use in Australia.