I pulled my radio out to wire an actual shutoff on it to stop the parasitic drain (it remains "on" with lights and dial lit up even with the radio off).
There is a nest of wires and if I recall correctly, another in-line fuse in the power wire. Not sure how this would cause problems with your CO alarm but perhaps that has an inline fuse as well? At any rate, you could unscrew the radio and the alarm and check to see if power is coming to the units.
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