lights dim 2nd battery

my lights flicker when my subs hit ... and i was wondering if i put a 2nd batt in my 99 silverodo and just hooked up my amp to it would it solve the problem .... or can a stock alt. hand charging 2 batts. ??

thanks qmw54

...... i dont kno what a good alt would be .... i am running a sony xplod 1200 with two 350 watt 10's but i plan to ugrade to some 450 or 800 watt 12's .... dont really kno what the right size alt or price would be ... thats where yall come in any names ... sites .... prices .... would be very helpful

thanks qmw54

I'd stay away from a cap and a battery. 

An additional battery will just help if you are playing your music with the car off for long periods of time, which doesn't appear to be what the problem is.  Your lights are flickering because they are pulling more current then you have available, thus your lights are not getting enough current (as are other parts of your car) to make up for it.

I would get a meter out and test all the connections and make sure everything is grounded correctly.  If all that checks out, you will need a higher-output alternator.  For the size of the alternator, I would just go with the biggest you can fit in your vehicle without any modifications so if you upgrade your system later, you won't be lacking in the charging department.

Agreed, adding a second battery is not going to solve your problem.. A cap would be just a bandaid to the situation look at getting a high output alternator.