Thank you all for sharing your expertise. I made changes to the diagram based on your input. I think I captured all of your thoughts and made some clarifications as well.The only thing that I didn't change was the added stereo fuse block/ground buss that will be installed under the helm (Note: this is not the existing boat buss).
As a point of clarification, only boat operation items run off the start battery and only stereo devices run off the stereo battery. All stereo grounds now terminate at the stereo battery ground (-) post instead of a ground bus. All stereo power originates at the switched lug on the stereo battery side of the master switch. One exception, the HU memory power will originate at the (+) side of the stereo battery.
I left the added stereo fuse/gnd block under the helm because I wanted a source of pwr and gnd for future expansion (BT, WiFi, EQ, etc). I was hoping to not have to route new wiring each time I added a device. I understand the reasoning to run pwr/gnd all the way back to the batt for each device (It's like star grounding a tube amplifier - all grounds route back to a single lug). However, IF I can get away with maintaining the block, I want to give it a try. I can always remove it later if it is a source of noise. Thank you David and Eric for your input on this.
I changed the way the system, "fires up". A switch will supply power to the HU and the HU remote turn on will power the relay which will turn on the amps. Thank you TigeMike and Shawndoggy for your input on this.
I wanted to install wire in sizes as recommended, but I am trying to save a little $ by using up some 8 & 4 AWG wire that I have had sitting around for too long. The runs are pretty short since both batteries, amps, main switch, ACR and added storage compartment fuse block are all right next to each other. For example, the 4 AWG run from the main switch to the amp fuse/distro block is 4 ft and the 8 AWG amp extensions are 18". The longest run is the 5 ft x 8 AWG trunk line feeding the new fuse/gnd block under the helm.
Thanks again for your input. I appreciate bouncing this off of y'all.
Here's a new diagram.
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