Australian Trailer Plug and Socket Wiring Diagrams

7 Pin Flat
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Image 7 Pin Trailer Plug Wiring Diagram

All diagrams are as viewed from the Cable Side

12 Pin Flat
This is an extension of the 7 pin flat. The 7 pin flat plug will fit into a 12 pin flat socket and work perfectly.

Image 12 Pin Trailer Plug and Socket Wiring Diagram

All diagrams are as viewed from the Cable Side

 

Small 7 Pin Round (QLD)
Identifying: Plug size is similar to an Australian 10c coin. There is a noticeably larger gap between 1 and 6 on this plug, though some trailer places rotate this connector that the yellow is at the top. Socket and plug are keyed.

Small 7 Pin Round Trailer Plug Wiring Diagram

All diagrams are as viewed from the Cable Side

Large 7 Pin Round (VIC)
Identifying: Plug size is similar to an Australian 20c coin. Pins evenly spaced. Socket and plug are keyed.

Large 7 Pin Round Trailer Plug Wiring Diagram

All diagrams are as viewed from the Cable Side

 

Heavy Duty 7 Pin Round
Identifying: Plug size is similar to an Australian 50c coin. Earth is bigger pin. No key (other than oversized earth pin) on the socket or plug.

Heavy Duty 7 Pin Round Trailer Plug Wiring Diagram

All diagrams are as viewed from the Cable Side