11.5 to 12.5 = no charge from the alt if the engine is running. Before you replace anything, remove the alt and have it bench tested. If I recall, the voltage regulator is an integral component in the PCM. The alt could be good with a bad PCM or opposite. Once you know if the alt is doing its job, you'll know what needs replaced.
One other thing, there are fuseable links between the alt and the battery. Make sure none of them are bad by checking for continunity.
Let me know what you find.
Tuesday, October 19th, 2010 AT 8:50 PM