Stereo & Electronics - low voltage

So i took my alternator,battery and starter off had oreilys check each one and past the test but im still getting low voltage. Anybody have any ideas on what else i should be looking at

So i did the whole taking off the positive cable of the battery and still was running but when i turned on the ac it died should i assume the alternator passed the bench test but is still bad?

is it the original stock alt?

ive switched from factory to a reman then to the truck all in the last year i do have a 10 inch sub with a small kenwood amp nothing big maybe the system is killing the alternators?

all remans? seems some here have lots of problems with remans thats why i ask

Yah i think ill get the 145 amp brand new

the problem with remans is that most builders cheap out and use china parts.....guess you can figure out how long they last

yah the thing is if i take the positive cable off the battery car still runs its only when i turn on the ac that the car dies so im wondering if the alternator is still the cause guess ill have to get a voltmeter also

Well i think i found my problem when i put the alternator after it tested good.I didnt tourqe the cable on the back of the alternator down so it wasnt making good contact.