Link to manual

1971 Chrysler Imperial Auto-Temp 2 Service Reference Guide - Session 281

Pin 6 is the constant B+ to allow the servo to park itself after shutdown. It says there is an inline 1 A fuse for this on Chryslers. However I don't know if MB did it the same way.

I would suspect that Fuse 2 has something to do with it, that is the constant hot accessory fuse on a 123.

Pin 8 is the main power, that is probably sourced from Fuse 8 which is the CC fuse on a 123.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech