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Weak Alternator?

My '84 4k runs at about 14 volts indicated on the center console
voltmeter until electrical items are switched on. Each item switched on
(lights, ventilation fan, wipers) draws the voltage down a little until
it is slightly below 12 volts. This is rpm independant. I changed the
brush housing and the symptoms stayed the same. Isn't the regulator in
the brush housing? Is the alternator bad/weak? Maybe there is something
else that would cause this? 
'91 200 tq
'87.5 coupe GT
'86 4kq
'84 4k "LTD"