Not familiar with "RF modulator thing", are you perhaps talking about amp behind glovebox?
First suggestion would be to reverse what you did, however that may not be possible.
Radio and clock have multiple power feeds. One for memory, one from dash dimmer for illumination and one for radio operation(clock has one for dimming when headlights are on).
I presume you checked fuses on the interior fuse panel above driver's left foot?
