Hi there Bassheads. I'm new here and I'm putting my own system together for the 1st time with no help from the local shops as far ability to install mechanically im great at that but I've never been good at the technical part I usually take whatever advice the shop gives me and they do the rest eventhough im very capable of installing my own system. I'm a huge Jl audio fan so I have 2 12w7's 2, 2 jl 500/1 ( i would do 2 jl 1000/1's but that would be to much for my current vehicle and my kids). Anyhow I will also be using a jl a1200 amp for my interiors and yes I know my amps are older but I already know what they are capable of and that's sufficient for me. My question is that Im driving a 1999 oldsmobile eighty eight fully loaded electric everything thing and my concern is extra batteries or HO alternator i know I'll need atleast one of the 2 because in my history and knowledge of jl amps they draw a lot of current and with my car having so many electrical components Im sure I'll get dimming lights @some point. Now I don't do alot of bassing without my car running its a forced habit due to past battery and alternator nightmares that were real so batteries really wont come in to play (If I'm correct). However i would like to know if i should change my stock battery, do a big 3 (I actually am a mechanic), how much more amperage should have from my HO (200, 220, 250 amps are the ones I found available for my car stock is 140 amps), and eventhough I know its safe I don't like the thought of having those batteries or bass caps in my trunk for nothing. Cause I pretty much dont bass with out it running. Can anyone tell me if I'm headed in the right direction, if not point me that way, and if so can I get some suggestions or opinions on my set up. i already have the equipment so changing brands and getting different amps and subs isn't a possibility. I am not good at understanding the calculations with amperage Thats why im asking