I have a 1993 Toyota Camry I just replace the alternator and got a brand new battery and my battery light still keeps coming on what can I do to fix this problem

clean all connections,make sure ALL are clean,free of corrosion,shines like new,and tight,including grounds.then check the voltage on the battery terminals with a volt meter with the car off.then start the engine and check the battery voltage again.this will be the alternator output voltage.post the two readings here.