....hmmm...my memory might be off...(its been two years since I had my '69 rewired and I dont have any of my pics/books in front of me), but I thought the orange wire might be related to the courtesy light (maybe the plunger or bulb socket area)?...and the purple wire might have been power to the vert top?.. You can verify the vert power wire by pulling the back seat and looking at the motor to the top, it should run along the drivers side under the rocker guard/sill area to the dash.
In looking at your pic, my bigger question would be, how many other wires are spliced like that? The more spices, odd connections and places where the wires change color, the greater the concern for shorts.
