What was found
DURING AN ANNUAL INSPECTION OF THE ELT UNIT, THE ELT WAS FUNCTIONAL CHECKED BY THE REMOTE SWITCH ON THE PANEL. THERE WAS NO LED LIGHT INDICATION WHEN SWITCHED TO THE ON POSITION. THE ELT UNIT WAS REMOVED FROM THE AIRCRAFT AND TESTED AGAIN, THE UNIT WAS INOPERATIVE. THE BATTERY PACK WAS DISCONNECTED AND CHECKED WITH A VOLTMETER. VOLTAGE WAS NOT PRESENT AT THE CONNECTION PLUG POWER TERMINAL END. THE BATTERY PACK POWER AND GROUND ARE ROUTED THROUGH A CIRCUIT BOARD GLUED INSIDE OF THE HOUSING, ONE OF TWO FUSES SOLDERED ON THE BOARD TESTED (OPEN). CAUSE UNKNOWN (AL03200320188)