Recheck fuses, swap fuses from circuits that work to suspect circuits (Fuse B = red 16 amp, Fuse 4 = white 8 amp),
https://knigaproavto.ru/shemy/en/mercedes/1142-1976-1985-mercedes-benz-w123-fuse-box-diagram.html

Radio also has its own onboard fuse.
https://www.peachparts.com/shopforum/3351838-post2.html

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78 W116 300SD 'Desert Rose' new as of 01/26/2014
79 W116 300SD 'Stormcloud' RIP 04/11/2022