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Only need to worry about it if you do something stupid like wire the radio to a 24v source. Plenty of 12v under the hood, as suggested above, a meter will tell you pretty quick what is what.

Easiest way is to hook to a 12v source (there are plenty of them) and install civilian components from a junkyard truck where necessary. Happens to be the cheapest way, too. Or wire in an inverter and use a home stereo for real oomph.