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Ok... Two switches and a relay... Switch one: ON, OFF, ACCESSORY. Switch two: TIMER with RESET. Also a set of status lights... Then if you need to get really fancy, install a voltage sensor to kill the relay if the battery voltage drops too low. This is one of those projects that can get as...

I agree with tennmogger, the relay is the way to go. Besides that, if you really have that dangerous urge to run your radio with the ignition off, you can put a switch on it for auto ( with the ignition ) or manual. If you do so, add an indicator light so you don't do the battery discharge...