Ford Repair: 06 Freestar losing power, best guess, accell

Question
I have an 06 Freestar that is losing power on acceleration and battery light comes on, and the red security system light comes on. I have already replaced PCM. I have checked charging system and found no problems. Have you ran into this problem before and or have any other ideas. Thanks so much

Answer
First, you need to check the power at idle. battery voltage should read 13.7-14.1 volts. on heavy accell. should read the same. you'll need to modify a meter to read this voltage. my best guess is your alternator is cutting out. not an uncommon concern. keep me posted -b-