PROBLEMS WITH MY 95 AURORA

I HAVE A 95 AURORA AND THE PROB THAT KEEPS HAPPING IS IT WOULDN'T START WHEN TURN THE KEY IF I LET IT SIT FOR A SEC OR 2 IT WOULD TURN NOW ITS TO THE POINT WHERE IT WOULD START AT ALL IT READ CHECK CHARGING SYSTEM AND I DON'T KNOW IF THATS THE BATTERY OR ALTERNATOR WHEN I GO TO CRANK IT I HEAR A CLICKING NOSIE NOW ITS NOT DOING IT AT ALL BUT MY LIGHTS COME ON THERE A LITTLE DIM BUT IT WORKS COULD IT BE A DEAD BATT,ALTER,OR STARTER EVEN I CHECK THE BATTERY CABLES ALL LOOK FINE :(