Charging System

What is your question?

i did change my altronator and when i dicconact the battry my car still working goog and altronator works good .so why altronetaor dosent charge the battry ?in the pst holidays my car altronator stoped working and i did charg the battry evry night and i use it in the day for 1or 2 hover but affter holidays i did find good alternator and change the bad one to good but know the new altronator dosent charge the battry ?pls tell me what should i do?