The best way is the solinoid setup they have posted.
The two just fused together has smoe significant drawbacks. One battery that is not quite up to snuff will present a load to the other battery, and in time you will have two dead batteries.
Use the solinoid setup.
What problem are you trying to solve with the use of two batteries?
a. Don't get an isolator. Wish I didn't have it, no reason for it but my installer insisted so I was like, whatever
b. Upgrade your wiring system. Think of it as a water pipe. The bigger the pipe, the more water flow: Same thing for electricity
C. A second battery is going to be a temporary fix. If you are sucking more power than you are producing, eventually you are going to drain the batteries and you are going to get flickering. If you are running heat/A/C, lights, windows, anything WITH your stereo, it is a drain. You need to recharge it back up
D. As for the alternator? I had my installer get with one of his boyz and hook me up. That sumbitch was EXPENSIVE!!!! But it gets the job done. I get zero light dimmage, zero loss in play and all my s**t stays playing strong
Oh and as a side note, if your system is not getting full power, your stereo is not playing to full capacity. Just a side note
Again second battery will help but may only be a temporary fix. You can never have too much power. I would try the 2nd battery (make sure the batteries are identical or one will drain the other) and if that doesn't work, then go to the alternator
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