There are a number of fuses for the lights & indicators, I think they are;
Indicators/hazard 15A
LH side 7A5
RH side 7A5
LH & RH dip
LH & RH main
Which fuses blow?
If you can find the blowing fuse have you tried removing the associated lamp(s), this would tell you if the wiring from fuse to lamp was faulty or if the lamp was faulty.
You can also take off the lower steering wheel cowl and meter the light and indicator switches.
If you don't have a multimeter it is a good investment.
But if it is mice or water then a visual check might just be the quick way.
