I haven’t had a chance to take pictures but this is very easy
Once you remove the signal unplug the wiper harness, it is the Largest of the 3 plugs and if you look inside the housing it’s the only one of the 3 that has a different set up on the inside.
1. Inside of the turn signal look to each connection terminal and you'll see a very small number next to each one...these are the wire location spots that you'll move the wires on the harness to.
2. On the old harness look at the back where the wires go in to the plug...each wire has a small release tab that you can push down with a small screw driver and easily pull out...(don’t pull it out with force and break the wire, it should come out VERY easy by just pushing on the little tab on the back of the harness.)
3. Now that you have them all out its time to relocate them to the 90-93 setup.
Here is a diagram of there location....just match the number on the inside of the signal to the color code of each wire and plug it to the correct position....its very simple and should take about 10 minutes to do the whole job. (OK, I couldnt get the attachement to work, so if you want it...I'll e-mail it to you. Just send the e-mail address to me)
Wire color and plug location for a 90-93 Mustang:
Dark Green: 65
Blue/Org: ?? I plugged it in the last open spot?