Folks thanks for the help It's nice to get some answers with no b.s. unlike some other forums. I did use the B.F.H. solution and a ton of dust came out of my alternator with the engine running and the light stopped flashing. I do agree the alternator does need a bench test the B.F.H.is not a fix. This just gives me an excuse to drive around my j10 jeep on superswamper LTB's for no good reason
untill the F250 is sorted out!
Thanks again for the response everyone!