2 batteries?

so i built a mount to set a smaller battery up near the fire wall above the coolant tank, so i could hook it up to the regular battery. basically just  so theres more power for my lights and stereo, because my amp drains it even with a capacitor. if i just hook it up will there be any problems, like charging for the alternator, or anything like that? i dont see why there would be, but i thot id just make sure.
thanks alot




2000 GMC Sierra SLT 5.3L  

depending on the size of the second battery.. usually a constant duty solenoid is used to isolate the second battery from cranking battery...

something 12 Volt  from the second page of this PDF file...

http://www.colehersee.com/pdf/H.pdf

run 6 or 8 gauge wire to the solenoid power terminals... and then onto the second battery...  

most RV and truck electronic shops can wire this up in an hour.. and do it right.. so the smoke does not escape the wires leaving you stranded...   this allows you to shut the truck off and run the stereo system from only the second battery..  and when you start the engine... the batteries are connected again... so your driving will charge them....  this may roast the smaller battery eventually...  talk to a truck electrical specialist.. or an RV specialist..

you can also do it with a battery isolator.. which is usually a big blue heat sink.. that takes the alternator output and runs it through a pair of diodes... one to the main battery and another to the second battery..


going to a larger amperage alternator is another thing...  there are custom units that put out amazing amounts of amperage...   be sure to increase the output wire size...   i just nabbed a 130 amp alternator from a front wheel drive cad... it has a 8mm output stud.. and a 4 gauge output cable attached...

the capacitors mounted next to the amp are an instant supply of power for the instant needs of the amp...

batteries are electro chemical... it takes a tiny amount of time to get the electrons flowing..  with a sound system and a few others... when huge draws are needed instantly.. the capacitors store electrons ready to work..

keeps the amps powered with enough energy to push and pull the voice coils to the max range...


my older brother (rip) worked in recording studios for most of his life... one studio he worked at and designed..  had 4,600 watts of power to the 4 18" woofers and various midranges and tweeters..   talk about a good sounding sound system..  loud enough to make you deaf...  that happened to my brother..... somebody tripped on a patch cord.. while the master volume was turned all the way up for testing..  took 2 days before my brother could hear again..


so.. what you end up doing depends if you are loosing battery voltage with the engine running.. or the engine off..


you can also find the factory parts to hook it up from a diesel version of the chevy truck...  as they had a second battery option...