X5 alternator bad?

[Jeffatpm]

Hello all,
I think my alternator or at least voltage regulator has gone bad.
I changed my aux fan and a few days later the battery light came on, the car drove until the battery was dead.
I've checked the fuses in the glovebox, the passenger rear cargo area, the block by the spare tire and the passenger bay one, any others I've missed?

I'm thinking to try replacing just the voltage regulator first, anyone know any other tests I should try?

Any thoughts or comments, things I've missed?

Thanks Kevin