There is a chance that your battery is still good but it is not being charged completely.
This is what I would do. Remove the battery from the vehicle and charge it using a battery charger. If you don't have a charger, most auto parts store will do this for free, takes about 2 hours. Once the battery is fully charged, re-install in the vehicle, and drive the vehicle to the parts store so they can test the entire electrical system to find out exactly which part has failed.
Keep in mind that in your case the voltage regulator is inside the PCM, if the parts store says that the alternator is bad, ask them to test the alternator output. (Right at B+ connector of the alternator and ground). If it is more than 13.5 volts, then the alternator is working but the voltage regulator is not (replace PCM). I f it has less than 13.5 volts, replace the alternator. The tester will be able to tell if the battery is still good.
Thursday, June 4th, 2009 AT 2:24 AM