Most common trailer wiring pattern

[Volcano cruiser]

Thanks guys. I just arrived back at my house here in Central America. Finally, I can get under my rig to see if I have the pre-wired connection that folks here have referred to. After I get a look see I'll order up the wiring that I need and then I'll post up my solution. Thanks again.
John

 

[snakedog]

How do yo install the wiries in the correct sequence using a standard 5 pin male trailer socket standard in 70's FJ40's? Rather more specifically; what are the positions of the wires-to socket in a readably in color code pattern? Daigram please?

 

[snakedog]

Trailer wires are brown, green, yellow and white. Which FJ 40 wires go to these?