Altenator or fuse?

[n44379]

Hi there i have myself a clk230 kompressor. The dash is warning of an alternator problem and the alternator is not charging the battery. However i do not think the actual problem is the alternator. The problem started immedietley after i installed a sound system so im thinking a surge of power or positive wires touching the chassis of the car could have blown a fuse somewhere, anyone had similar experiences? or kno the location for this paticular fuse? ANY help would b much appreciated

 

[television]

There are no fuses for the alternator as far as I know