Replaced my dead alternator with a AL129X. With that I eliminated the plug and have a direct lug connection to the junction box. After hooking things up I now have a dead radio along with the front passenger and rear driver windows not working. Fuses are all fine. Any ideas?

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

Did everything work fine prior to seap?

Ya said dead alternator, possibly low battery voltage melted things?

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!