the battery
Had the same problem. Bought a re-conditioned alternator, turned out it was bad. Usually if battery draining, it's alternator or battery or both.
did you unhook the battery before replacing the alternator
my battery is still on after changing battery and altnator
Defective alternator, loose alternator drive belt, dead cell in battery, or something is on pulling power from the battery.
Something is on draining your battery overnight. Any light or any relay. It can also be your battery has a dead cell draining it overnight.
You might have a bad battery, a poor connection between the battery and alternator, or a bad ground from the battery.
many things can do it suck as junk battery, junk alternator , or leaving anything on in the car
Alternator is defective and needs replacing.
Your alternator is shot.
your alternator ain't charging your battery or a bad connection draining the battery
The alternator is probably bad. That is what recharges your battery