Hmm, well assuming the wiring colors are still original...I'll take a stab at a few.
Light blue is the color of the factory solenoid wire from the ignition switch, but I'm not sure why there's two.
The yellow wire is the power supply to the washer fluid pump from the switch.
The purple wire is the wire to the factory oil pressure sensor.
The purple wire with a tracer is to the factory water temp sensor.
The red wire is probably for the factory horn, but there are several reds in that harness.
1973 VW Karmann-Ghia first car
2009 Challenger R/T 6MT, Flowmaster, inTune daily driver
1977 CJ5 304, 3MT - under construction
And many in between!