80 A strap fuse on the relay. If it just cracked, replace it (two screws) and don't worry. If it actually blew (melted and arced), find the short in the wires to the glow plugs before using them again!

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!