If it worked briefly when you replaced the fuse, I expect it's the connection in the fuse box. The car is quite old, and fuse connections do corrode, the exact thing happened to my wiper fuse recently. Remove the fuse, (check it didnt blow) and clean the connections with some fine emery paper / sandpaper. Putting a voltmeter across the two terminals with the fuse removed should show 6v or 12v depending on wiper switch position. If there's nothing there, it's not the problem! If you've got voltage, at least it's not the power supply or the switch, but could be the motor. They're quite bulletproof though.
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black