OK, here goes my question. I have a 2002 Ford F-250 Crewcab, 5.4 liter. My problem is with the High Beams and Flash to pass. I have checked there are 2 fuses under the dash. One 30 amp main fuse. And one 15 amp fuse. They are good. I looked at the bulbs and they apear to be good. The only thing I did lately is replace the alternator, and then change from a stock battery to an Optima Yellow Top. Any suguestions?