Running A 2nd Battery?
 

I'm not too sure how to do the wiring for a 2nd battery in my trunk, I plan on redoing my audio setup, currently I have 2 - 12" subs and three amps I'll be moving around and then adding another 2 12" subs and another amp. But with the original setup I can see my lights beginning to flicker.
So hopefully another battery to run the music off or share the load will help it. Anyway just using general knowledge:

Should I: run a 0/1/4 Gauge wire from the front battery along the side to the rear battery, some have suggested a battery isolator, but I know its still possible to have it wired in parallel with each other just to give it some extra juice. How do I work the negative terminals without short circuiting everything else (step by step process or dialogue) would be good thx.

Just get a 15 farad cap lol, I heard the battery relocation wiring or something is expensive.

lol I plan on adding 2 more, but that will kill it even more lol

Its not hard I think I found out how to do it.

Getting a 2nd battery and a isolator to have them charge simultaniously when the engine is running. Using the 0/1/4 Guage wire from positive to the battery from the isolator then connecting the same guage wire from the negative to the cars Earth. The wiring all the amps with shorter guage wire is the difference. Plus it has its advantages to have a 2nd battery, lets say the front battery dies, you can simply boost it from the back battery, let the car run and recharge it lol.

The next thing to do from there is to install a High-output alternator to hand the load better, reducing the light flickering. Also it should then be easier to wire the capacitators I plan to install soon.

dude.. so much trouble... jusr get a high output alternator and a good capacitor.. your good to go.. and a good deep battery...

It's not much trouble at all really. High output alternators go for $500 each easily. I don't wanna waste money on one yet since I plan on doing an engine swap in the summer.

May I ask what system this is that you want to add another battery for lol? "2 12" and 3 amps" is not enought information.. it could be 2 P3's for all we know lol :P

Be careful with h/o alternators. They may only put out the higher current at or above a certain RPM. At idle you may actually have less juice than your stock one.