02 monte carlo ls 3.4
105 amp alt
Skar 1500.1@1ohm(if that matters)
Newer interstate under hood(will replace if needed)

No big 3,going to do that in 0\1 when installing.

Amp isn't currently installed so the car is naked,just trying to have everything lined up so i can just do install in 1\2 days.

What do i need to upgrade my electrical? I was looking at grabbing a 2nd battery,any advice\what should i do?

Been out of audio for a few years so i forgot what i knew.