Oldsmobile/Buick Repair: 1995 Buick Century trouble, altenator, buick century

Question
Hi, I have a 95 Buick Century, 3.1L, OD trans.
I seem to have a problem with keeping a charge.
A new altenator was put on 3months ago now it has "fried" again. So I got a new one, put that on and it still won't stay running for long. Checked the battery with a multimeter and it is fine, checked the new altenator with the multimeter to see if it was receiving and producing charge, it is receiving but it doesn't seem like it is producing charge to the battery. Mind you this is a brand new altenator, I am going to have it tested to be sure it isn't a dud or something. So if it isn't, I am kinda lost, have any suggestions on what my next steps should be?
Thanks for you time and I appreciate your help!

Answer
HI ANGELA,ALTERNATEING CURRENT.WORKS ON A DEMAND BASIS.IF YOUR BATT DOES NOT DEMAND VOLTAGE ALT WILL MAINTAIN 12.8 VOLTS.WHAT WOULD STOP THE BATT FROM DEMANDING VOLTAGE.THERE IS A FUSIBLE LINK THAT CONNECTS AT THE STARTER AND GOES TO THE ALT IF THIS LINK FAILS THE CHARGE PROCESS ALSO FAILS.THIS IS WHERE YOU HAVE TO START TO REPAIR THIS PROB.IF I CAN HELP ANY FURTHER PLEASE FEEL FREE.PLEASE TAKE A MIN OF YOUR TIME TO RATE MY HELP TY BILLYMAC