Peugeot 307 2001 2.0ltr petrol?

if the fuse keeps blowing then I suspect a short circuit in your lighting system which can be tricky to find,the fault could be front or back and would make sure the correct bulbs are fitted,check wiring round about the light units for chaffing/rubbing through paying attention to where it runs next to sharp corners in the body panels and engine compartment.If still struggling then an auto electrician may help you out.

cdc
October 2013