how do i get my park ave to keep a charge? on 1995 Buick Park Avenue

I was driveing one day and i noticed the battery voltage was low and then it died, replaced the battery checked the alternator and it still wont start or keep a charge without being jumped.

Asked by for the 1995 Buick Park Avenue
2 answers
STILL wont start with a new battery!? You need to find out if there is high resistance on those battery cables or terminals. If that is solid, then check for alternator output and battery drain.
how did u test alt or who tested alt? you may also have a large draw or load causing battery to discharge,you may want to seek diag and est