High Beams Blowing Fuses

When I switch to high beam, on the head lights, I blow a 20 amp fuse. It appears, on My amp gage, that I have a problem with the charging system (alternator / VR), the amp gage stays at Xero ( no charge), or below. I do not blow fuses on low beam. -- My current alternator is , only, putting out 30 amps, And I have a electric fan. Is it possible that if I replace the alternator, and / or the regulator, that My problem will go away ? -- I have checked, all, grounds.