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Voltage concerns related to alternator

(1990 Chevrolet Camaro)
in Shreveport, LA on June 20, 2010
seems that my alternator isn't putting out enuff "voltage" (or whatever the term is)...meter is saying 12.24, with engine at idle and no lights on or air conditioner on, etc.
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Popular Answer
on June 20, 2010
make sure there is 12v to the big wire in the back. in the 2 wire connector, one should be hot with the key on and the other will have 7 or 8 volts. if you have these readings, replace the alt.

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on September 01, 2010
try to connect the neggative connector from the battery terminal to the car's body then measure the voltage again if you still have the same problem thats when you need to change the Alt. because it should read 13.6 when idle.
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