I will be building my first bigger system in about two months. I know what head unit and speakers that i want to use, but where i am confused is with the amps. I think i am going to use a 5 channel amp but I have seen the fuse on them range from 1 30amp to 3 35amp also seen them at 1 100amp. This is my issue I am not sure what i will need to upgrade in my truck to handle the extra power draw. I've read the alternator first then battery then capacitor. Then some where i heard that if i do the alternator that will not do anything and i should do the battery first. My truck has the 145 alternator and only the single stock battery. I have a 2011 chevy silverado z71 with tow package. So i guess my questions are at what point will i need to start upgrading stuff and what would be the best order if i need too.