I recommend you test the fuses before you replace them, it could be somethings else and elimination of possible causes is the only sensible way to proceed with electrical faults. If you do not possess a multimeter that can test for continuity through the fuses make yourself a simple tester from a torchlight and battery circuit and use this to prove if the fuses have blown or not (i.e. so that when you connect to the fuse from one battery end and the other end to a bulb if the bulb lights the fuse is okay).