Look at the backside of the fuse block(thing fuses go in). The different wires/circuits are screwed to the back... you will see. Sounds like maybe the screw is loose.

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08 R320 CDI current

Past
95 E420
87 300D Turbo 5spd
90 300TE
83 300SD
85 300TD
92 400E
85 190D