I suspect the alternator in my 4.8is is not charging at all. The car died on me today and went into limp mode before it cut out. When trying to start the car again, the battery was totally drained with all warning lights on the dash showing.

The voltage tested at 11v, and after jump start the voltage does not increase when increasing the engine speed. I suspect the alternator is not working, but there is no warning light on the dash to identify this. Will worn bushes in the alternator do this or is it the voltage regulator?