#1 Not sure about this one. The Rallye harness that I have out does not have it.
#2 looks like the emergency flasher or turn signal blinker connector. One clips to the side of the pedal assembly, the other one clips next to the ashtray.
#3 This yellow wire supplies the power to your light group lights. One goes to the ignition switch light, my other one is not plugged in like yours.
#4 Yes the cig lighter only used one wire. The ground came from the dash frame.