I have a 90 amp alt and will be driving a 12 btl with a dtr1 2200d soundstream amp that as a 200 amp fuse and a audiobahn a6601t that as 80 amp fuse i have a 3 farad cap and im going to buy a back up battery but i dont know wich one yet i will also buy an isolator but im wainting to see if i have to change my alternator...everything is going to be wired with 0 gauge and i changed my car battery ground and my motor ground for 0 gauge and added a extra wire from my alt to my batt. wainting for ya reply to get this thing loaded