I just went through this, where I removed the steering column from my 27 many years ago and over time forgot how the wires went. I sat down with the column and an ohm meter and did process of elimination. What you have to do is have a piece of paper and pen handy, and start checking wires when the switch is in various positions. After a while you will see that one wire will be your 12 volt power in (from a flasher) and one will be the signal from the brake light switch) From there it is a simple matter to determine what ones light up when you move the lever to the left side, and what ones light up when you move it to the right.
Takes a little bit of trial and error, but after a while and a lot of talking to myself, I figured mine out. As a start, I would think on yours the green, brown, blue and black would be for the front and rear, left and right lights. It could then be that the yellow, red, and orange ones are for the power in, brake light switch, and maybe a four way flasher mode.(if yours has that) I think mine only had 6 wires, no four way flashers on it)
Just pick one of the orange, red, and yellow ones and start there and see what is hot and what is not when the lever is in various positions. After a while it will become obvious what is what.
Don
BTW, I just remembered I have an old turnsignal setup still in the box at the shop and will look to see if it is the same brand as yours and if there is a wiring diagram in there. If so, I'll post back.