Battery Light stays on.

[jj500]

Howdy,last night as I was coming home the battery light came on briefly at low speed but then went off when I went faster.When I got home and shut it off the battery light stayed on.Checked the fuse box to see if anything was weird and found the C fuse had blown,replaced it but the light stayed on.Called the mechanic today and he said alternator,I asked about maybe voltage reg and he said the light would go off if that was it but it stays on if its the alternator.Any suggestion ,hints info on this.I have not checked how much its charging but when you start it up the light goes off.Thanks