12/71 dash wiring ?'s

The wires in pic are coming down from dash towards fuse box. The blue wire with inline fuse ( the wire is a little bigger than the rest), does it go to the heater fan or rear defrost? Also in other pic, I see that a blue-white, a blue-red and a blue wire go to the antenna. I also see that a blue-white wire goes to cig. lighter. I don't see another blue-white wire, there is only one. Any help? Thank you very much.