What happens if I don't?

Drew:(

I'm far from an expert on this but I think the main reason to is so that you don't blow fuses if you accidentally short something while wiring stuff up. I suppose there is also the possibility of damaging expensive audio components if you happen to short something with the system "hot".

I never unhook my battery when doing audio mods. No problems to date in the past 4 -5 vehicles.

I very really unhook the battery every other week I'm helping some one with they’re stereo it seems.

I never unhook mine.

Ben

use to be an installer and have installed hundreds of stereos and equipment and have never pulled the fuse