First check fuses. Alternator and PCM fuses. Pull them out and look at them. This takes care of corrosion problems. If it's still no go,then you need a volt/ohm meter and wiring schematics. The PCM grounds the field in the alternator. You'll have to check that wire and see if it is broken(usually at the alternator plug) or if the PCM is dead at that pin. The PCM can be bypassed for the alternator. Let me know.
Have you checked alternator input and output with a meter to see if it is getting to the battery ?
http://repairhelpcenter.blogspot.com/2011/11/how-to-inspect-vehicles-alternator.html
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How to Test Vehicles
Alternator?
http://repairhelpcenter.blogspot.com/2011/11/how-to-test-vehicles-alternator.html
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How to Service Vehicles
Alternator?
http://repairhelpcenter.blogspot.com/2011/11/how-to-service-vehicles-alternator.html
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How to Replace Alternator?
http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-alternator.html
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How to monitor Vehicles
charging system?
http://repairhelpcenter.blogspot.com/2011/11/how-to-monitor-vehicles-charging-system.html
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Car Alternator making
noise?
http://repairhelpcenter.blogspot.com/2011/11/car-alternator-making-noise.html
---------Car Alternator Working Intermittently?
http://repairhelpcenter.blogspot.com/2011/12/car-alternator-working-intermittently.html
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Car Alternator Bearing Makes Grinding noise?
http://repairhelpcenter.blogspot.com/2011/12/car-alternator-bearing-makes-grinding.html
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How to Inspect Alternator
Drive Belt?
http://schematicsdiagram.blogspot.com/2011/12/how-to-inspect-alternator-drive-belt.html
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How to replace Alternator Drive Belt?
http://repairhelpcenter.blogspot.com/2011/12/how-to-replace-alternator-drive-belt.html-----------
Power windows not working after
car wash?
http://howtobyme.blogspot.com/2011/11/power-windows-not-working-after-car.html
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Car battery loosing its
charge overnight?
http://schematicsdiagram.blogspot.com/2011/11/car-battery-loosing-its-charge.html
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How to maximize fuel
economy on your vehicle?
http://schematicsdiagram.blogspot.com/2011/11/how-to-maximize-fuel-economy-on-your.html
-------------Charging system problem troubleshooting?
http://technoanswers.blogspot.in/2012/02/charging-system-problem-on-chrysler-lhs.html
------------For All types of Power window problem
http://repairhelpcenter.blogspot.com/2012/01/pontiac-grand-am-power-window-not.html----------This will help.Thanks.
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