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who checked it good, and was this check on or off the truck? it's more accurate to take it off and bring it to autozone or somewhere with a bench tester.

even with that it could still be bad. i had a similar experience with an alt that tested good, but fried my PCM twice. the regulator is controlled by the PCM on the 4.7 and can be damaged by a bad alt which requires you to replace the PCM. nothing else is affected but your alt will not charge the batt. if the guages and lights are flickering and you are getting the overcharge then it's def either the alt, PCM or both. i would replace the alt first before you do blow out the PCM or damage the batt.
 
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