dual alternators and batteries

You ditched your a/c for ur stereo?! 

Wow.  That's dedication.

first off.. i wouldn't recommend what u are tryin to do.... but i can say this..... i admire the dedication.... u need to consult a shop that specializes in charging systems before u proceed.... like an alternator shop or high performance shop or something... next up... do u have a bracket already fabbed out to hold that other alternator in there the rite way????

second... a 120 amp alternator is nuthing in the world of car audio...... it's only gonna give u 60 amps at idle speed of the engine.. what u need to do is get yourself an ohio generator or a mean green high performance alternator... if money is tight see if there is a rebuild kit available for that alternator and see if u can bump it up a few amps...  most decent class d amps will pull 60 amps like it's nuthing...

third... get rid of the cap... if u are pullin enough current your charging system is gonna see that cap like it's just another amp and still not help u much... u need to get some optimas or kinetik power cells.. those will do the job if u got a high amperage system....

one thing u do have workin for u is the fact that u got a chevy.. there are many charging system upgrade alternators available.. u might wanna consider just replacing your stock alternator with a 200 amp alternator or better.....

There are really only 2 problems and they are: I think the ground will have to be its own wire so it doesnt compete with the stock. Also making sure the alternator doesnt over charge the battery.

Yes I am dedicated, I live in IL and it doesnt get that hot up here and if it does thats why I have windows.

I have already mounted the second alt. has been on the truck for about a month now with no probs.

okay... are u plannin to connect that alternator to the cars primary battery... if so... this wouldn't be necessary... what u are planning to do is run two virtually independent chargin systems... one for the truck.. one for the system....... overcharging shouldn't be an issue because that second alternator should have a voltage regulator inside of it that will shut the alternator off when your cells reach their limit... plus your amps will be distributing the current when u are bumping your system... but u probably wanna get yourself a separate voltage meter for the audio systems alternator... completely separate from the other alternator...

so just so we are clear..... stock alternator and battery underhood should be connected as if u had no system whatsoever.... completely separate from the 2nd alternator... then get yourself an optima or a kinetik to go in the back somewhere.. or even under the hood too if u got the room... and now this is strictly for the audio system....... make sense... lemme know if not... and yes the ground and charge wire from the second alternator will be separate too..... lemme know if this helps......

Yah I just want it as its own sytem seperate from stock.