a/t, brake. battery lights on

[ercp98]

i have a 1998 full size montero. the A/T, Brake,battery lights on the dash turned on all at the same time.
after some research it boiled down to the alternator. so i took off the alternator and had it tested at auto zone.the alternator passed.
i reinstalled it but the volt meter says that the alternator is putting out 14 volts at idle. however with load... lights on. a/c on, radio on and trans in drive... the voltage drops to 11 volts. does this mean that the alternator is actually bad and yet passed the test?
i used both a volt meter and an alternator / battery tester to test the alternator and battery.

thanks in advance

[les]

I would get rechecked, having turned everything on as you said, that meter should show it pulling more amps