The fuse itself can't go bad per se, but the contacts can get corroded depending on locale which would increase the resistance and limit the flow of current. Sandpaper, emerycloth and D5 Cramolin from Caig are my suggestions. HTH-

Dave

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'72 220D - Needs good home!
'80 300TD - On to 'greener' pastures...
'74 280C (RIP)
Gone Korean, but dreaming German...


"...Heard the diesel drummin', all down the line."