Wiring diagram help
That rather poor drawing is supposed to represent the factory 2 terminal connector for the radio to dash harness.
The two orange wires are the dash dimmer controlled dash lights, and that terminal hooks to the radio dash light
Bottom terminal is power. The bottom is also used as a junction point
The Red/ tr (tracer) goes off the page to the other diagram to the fuse
the white runs off to power the reverse light circuit.
http://www.mymopar.com/downloads/1971/71ValiantA.JPG
http://www.mymopar.com/downloads/1971/71ValiantB.JPG