97 ford taurus still won't work?

2nd alternator and it's in working condition (voltage regulator and all), brand new fully charged battery, battery bolts clean, all fuses and mega fuse clean and working, ground cables good, still dies and drains battery completely within hour even minutes when lights on… Multimeter clocks battery at 12.6 when off and down to 12 when on, why is this happening?! The alternator is even definitely hitting the battery because autozone was able to test it through the battery i don't know what to do anymore

If we have such a power drain down we have a major parasitic drain from battery to earth. Assuming diodes in alternator battery are in fact ok. And I think it's likely they are from your information.
You need to isolate the circuit draining down battery. This is a high flow rate. Have auto electrician trace. We can see battery discharging by using a multimeter in circuit. Test circuits by pulling fuses on each until drain stops.
The battery ought to show higher than 12v at all times. Charging expect up to 13.5v.
Once we have found our power drain we can locate the faulty component. With such a high power drain will be either large energy user component or a direct short to earth. Eg trapped/ non insulted wire etc.

Your problem is autozone. Check all interior, under-hood lite, trunk lite, only have reputable auto tech evaluate and work on vehicle.

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