I haven't run the cables yet, just saw from previous posts in here that 2 runs we're needed, or I misread. Lol. Alternator is installed and subs are in a jl audio 12w7 ported box. Current amp is a kicker 500.1 and stock alternator I could pump at lvl 28 without any problems at idle. I put alternator in and can't get past lvl 25 on same song without voltage fluctuation big time. I emailed power max and this is what guy says. "How you calculate and bought 220A alternator ?if you have 5000watt sound system 5000= 416A that is mean you need minimum 500A alternator to take care your sound system you need to install second alternator to get that much power ,This alternator will not work for you and you can send it back,you can install two 250A alternator the alternator you can install two 8292 x 250A each and total you can get 500A but not in idle normaly all altenator will give you maximum power when you are driving and in idle you can get 45% power that is why you need second battery and high capacitor ,If you have more question you can call me" I was planning on bridging 2 saz2500's but decided not too. So I will only be runnin at 2 ohms for now till I get the money to get some fi's. Then run them at 1 ohm. I was mainly concerned about th voltage fluctuation, is this normal with high output alts? I'm going to put an amp clamp on the output wire tomm and load the system down and see what it actually puts out.