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ok... Stalwart was faster, :-)

the second is the one that grounded to the frame. it doesn't matter if your connecting your + cable for 12V pickup to the - terminal of the first battery or to the + terminal of the second one. they're connected with heavy gauge cable together, the result is the same. you got 12V with - on the...

if you run 12V lights in series, remind: if one fail, both are dark. never do this with driving lights, this can be very dangerous. cab markers, interieur lights - who cares about? (but for what?24V bulbs aren't expensive.)

i wouldn't do that....electronic is not a bulb, you need ohmic resistance to get the right voltage. a small 24V-12V DC converter is cheap, don't fry your stereo.

why make things so complicated? use a second alternator, a 3rd battery and you're fine! with a cheap 66A alternator you have enough power to use working lights, cb, cooler and so on.