Honestly, I think I should be able to figure this out from the schematic, but I'm not sure. My Grand Prix has an unattached wire that I'm sure goes to one of the "D" drop target switches. If you make me guess, I'd say it should be soldered to the same switch tab as the thicker blue with red wire shown in the picture, based on the way the other drop targets are wired.
Can anybody confirm the correct switch tab for this wire? The unattached wire is on the left with the same blue with red color as the thicker wire that is attached to a switch tab.
For bonus points, can anybody explain how I should have been able to determine this from the schematic?