Bro big 3 can be done with 4awg wire...infact i have also done big 3 in my car with 4awg wire...
For big3 u'll need 3pieces of wires...
1: from battery negative to chassis
2: from chassis to engine block (it will be best if u bolt it where alternator is couppled with engine)
3: from alternator positive to battery positive(+). {This one is most important}
I'am running 1200 watts rms setup in my charade without any capacitor..no problems at all..
Battery is of 65amp
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