why my alternator keeps going bad on 1996 Ford Contour

well i put a alternator n the ford drove it for two days an the thing went bad so i put another one n an like n two days that one wasnt any good but be for i put them n i had them checked at auto zone n they said they both was good n they both went bad

Asked by for the 1996 Ford Contour
where are you buying your parts that might be the issue or poss bad battery
2 more answers
Have all wiring and fuses been checked? Do you FULLY charge the battery BEFORE running it with the 'new' alternator? Bad battery can cause alt. failure.
are u buying new alternators or remans