When i was driving earlier i noticed that my front lights when on normal beam were slightly flickering. They went slightly duller then brightned up abit.
I noticed that the radios illumination and the dash lights (heater ones and speedo ones etc...) all did aswell.
Why does it do this? seems to be where the engine ticks over. Do i have a problem with my wiring or is it nothing to worry about?
Im also worried that when i get around to replacing the 6x9s in my boot and the 3.5" in the dash along with wiring my new head unit in (still havent done it

) and putting an amp/sub in the boot that im going to get worse effects and damage something

Cheers guys