What do I wire an amp and sub to?

Hi all!

I am installing an amp and sub into my 2021 Kaiyen. Do I wire it to the battery switch somehow or the battery itself?!


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Under the port side dash is an amp rack. Should be 2 buss bars 1 for power and ground.

You want to insure that the new amp's B+ is drawing from the same source as the rest of the audio. I prefer to have my audio pull through the main battery switch v's battery direct.