Check the fuse again, likely it's cracked and will fall apart when you take it out of the fusebox.

If the brake lights work, there is something wrong with either the wiring or the cluster itself. Stop lamps are on the same circuit, as I discovered by nearly getting rear ended!

Might also be the OVP, but I'd be surprised.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!