Well after the stereo upgrade and boot install neons etc, i can hear a noise when my headlights are on

and have put it down to altenator struggling to cope with the stress the more stuff i turn on the louder it gets ( in the engine bay its not whineing interferance noise)

What can i do

New altenator ?
Upgrade wiring to altenator ?
service altenator ?

anyone have any ideas thanks guys