Hi, fuse 11 (30amp) is for L/Hand side, fuse 13 (30amp) is for R/hand side, fuse 15 (3amp) is for the idication on the switch, all in the fusebox by battery, if the 30amp fuses are OK, you will have to do a resistance check from fuse's 11 & 13 to earth to see if the screen has failed.
If a copy of the wiring diagram would help contact me on, nige110162(at symbol)hotmail.co.uk
nigel
December 2009