And back to your original post, about how to maintain the fuse box on a 123.

The intent is to take the fuse box and push it into the interior of the car.

Then go up under the dash and pull it down. They built the wire harness long enough that the fuse panel can be laid on the floor board for maintenance or testing.

Of course it goes without saying, pull the battery negative cable first!

__________________
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