In that case the power is coming from onboard battery or if you're plugged in to shore power, it'll come from the converter. Unhook shore power and turn off the 12 volt house power. That should kill it.
If that doesn't kill it, you'll have to find the fuse that feeds it. That fuse will be in the converter where the breakers are. The breakers are for 115 volts AC only. It's one of the fuses that will feed the radio and it should be marked as such. There should be a fuse puller in the converter.
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Don
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