Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think) | etrailer.com
Wiring a 7 Blade Trailer Harness or Plug
Where is trailer plug? | Page 2 | IH8MUD Forum
7 Way Plug Information | R and P Carriages | Cargo, Utility, Dump, Equipment, Car Haulers, and Enclosed Trailers in Chicago, Ottawa, Dekalb, and Joliet, IL