Blowing a 20A fuse means you have a shorted wire or component (clutch coil) somewhere. Time to find a new mechanic. If you've been repeatedly trying to run it with a short like that, you may have some melted wiring to tidy up now.

Fuses blow for a reason. A poor ground is not one of them. Overload of the circuit or short circuits blow fuses.

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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]