U need to take a ohm meter or a regular multimeter would work and stick one prong in each side of the light socket. If u register a resistance measurement then u have what is called continuity. That means u don't have a blown fuse. If u don't have any continuity than it is likey a fuse and all u need to do is pull it out and go to the store and buy a new one. It will just POP out and they are rated in amps. If it keeps blowing u wither have a short in your wiring or ur getting a power surge from ur outlet