I have a 04 duramax, I guess all diesels have 2 batteries. I know I do and the trucks at work do. Now if I run between 900-1300 watts rms do I DEFINITELY need a bigger alternator or am I good with the 2 batteries and a 3.0 power acoustic capacitor? I think the alternator is 105 amps or 145 amps but more than likely 105 amps. Or do I have to invest in this? http://cgi.ebay.com/ebaymotors/99-04-chevy-duramax-6-6-diesel-alternator-high-am p-NEW-_W0QQcmdZViewItemQQhashZitem27b1a17d88QQitemZ170483875208QQptZMotorsQ5fCar Q5fTruckQ5fPartsQ5fAccessories
you will ok with stock, lol glasswolf wants you to read for 12 hours. no need to really spend money on an alt if your just gonna be around 1000 watts. now if your looking at like 1500+ it would be necessary to do, but honestly your not going to hear a big difference from 900 to 1300.. very marginal your best bet with that power is run good subs in a nice box design, its all about the box
1000 watts from a class D amplifier is 100A of current draw. Most stock alternators in hondas and toyotas and the like can't even supply 100A total, let alone to an amplifier, and to the rest of the car's needs in addition.
he will be close enough lol i have been trying to tell everyone that you can't run more than 1000 watts off a stock electrical for a long time, but everyone would come back and say you can and try to make it seem like i didnt know what i was talking about. everyone is so quick to recommend an aq 1200d for an amp and say it can be run off a stock electrical.. but a stock electrical can't even properly power that amp, and what about a 2 or 4 channel on top of that?
Ideally, just try it and if the voltage rails sag, then start upgrading things, but if someone wants to argue "oh you can run anything on a stock electrical system" send them to me. I'll argue with them, happily.
When they can disprove Ohm's or Kerchoff's Law, I'll gladly concede.