Do you have a FACTORY service manual? If not run over to
MyMopar.com and download it, two volumes, one for chassis and one for body. Some of us here is whey it got posted
The radio connector is simply used as a junction point, the red is key switched accessary power to the radio, and the white is a branch to feed whatever is on the white line
If you go to about page 8-153 in the manual, the index says "radio" at D38. That is the coordinates on the schematic. So go down a few pages to 8-163, you see the radio, and the red wire to CI-13, the radio connection. Follow that wire down, B1-18W which means circuit B1, no. 18 ga. wire, and White.
Follow it painfully page by page back to the bottom of page 8-160 and you'll see it goes to connector CE-2B (engine bay) and AGAIN branches to wire D1-18BK. Follow that up to the top of page 8-158 and it goes to the turn flasher, connector CI-12. Now if you go forward some pages you'll find the engine bay connectors, that CE-2B above you'll find on 8-164 and is the big bulkhead connector
In the manual, go to about page 8-168. That chart is the "CI" Instrument panel Connectors. At the bottom left of the page is CI-8 the time delay connector. Notice it gives you an approximate location.