On shore power, the converter is supplying the 12 volts to the appliances. When the engine is running, the alternator supplies the 12 volts, once the power is removed, the Battery Control Center (BCC) is supposed to route the 12 volt power from the batteries to the appliances.
Look for a DC circuit breaker in the Battery Control Center that needs to be reset. It is where you heard the click or clunk sound.
Mine has a DC circuit breaker mounted on a circuit board with a small black push button on the side labeled CB5. Once reset, all my 12 volts from the battery came back on.
06 Hurricane 34FT WH W20 Chassis 8.1L 129K, Steersafe, Koni Shocks, DIY Trac Bar, Tri-Metric 2025RV Battery Monitor, 4-6V Batteries, Scan Gauge 2, Crossfires, 735W Solar Morningstar MPPT-60, KVH R5 In-Motion Sat, XM Radio, 07 Chevy Malibu Maxx Toad, Falcon 2, Brake Buddy, Escapee