Large robot wiring issue

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i have large robot 1 lead acid battery 12 volts 36 amp hour.
in robot far have notebook pc computer (i play on keeping pc's battery charging off of robots lead acid have not done yet not problem, yet)
i have 12 volt vga monitor plugged lead acid power , laptop vga cable
i have 12 volt speakers attached computer through audio out on computer. problem is. had plugged computer's 2.1mm audio output. go attach power speakers. plug 12 volts (not ground wire. 1 wire on 12 volts ) , speakers powered on.
so appears speakers ground went through computers sound card through video card through vga monitor , ground vga monitor connected to. monitor shut off still work though.

1) called when happens (a short?)
2) can cause damage? planning on having arduino control power speakers turn them on , off.
3) can prevent issue?

thank , time. interested in learning has happened.

i did more research. need , optical isolator? there way 1 battery?


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