I only have the one battery in the front. I feel like I'd rather do what I can to the front first, rather than add more and not have it complete. Just how my brain works I guess. Plus then I have make something to hold the battery and run more wire through the whole car.do you have an extra battery at the back? to tell you the truth i didnt do the big three, i added wire from battery to ground and ran a 4ga wire from front to back and have an extra 35ah battery and my elecrical is holding up
I was planning on getting a new substage around 1200-1500rms.why do you think you need a big 3? your sub amp is only 500 watts? I agree in changing your battery up front first to a gel battery if your having electrical dimming issue. do you have a volt meter?