Alternator whistle sound

Ok guys another update. Did some tests and at alt I'm getting 13.8-14.3 volts. With dual fans on. At battery getting 12.5-13.2. (Batt in trunk)

Now about the strobing headlights. When car is idling with fans off they strobe but when fans come on they don't.......

Sorry for being all over the map. I'm not sure why earlier voltage was getting down to low 12s.