What was found
WHILE PERFORMING THE ANNUAL ELT INSPECTION, THE ELT WOULD NOT SIGNAL DURING THE "SHAKE" TEST. THE COVER WAS REMOVED FOR A VISUAL INSPECTION. THE G-SWITCH WAS INSTALLED BACKWARD. ALL INDICATIONS WITH A MAGNIFYING GLASS APPEAR THIS TO BE A FACTORY INSTALL, NOT A REPAIR OR REPLACED SWITCH. (APPEARS ORIGINAL GLUE AND SOLDER ON G-SWITCH APPEAR INTACT.) IT IS VERY CLEAR THE ARROW ON THE COVER POINTS FWD, AND THE ARROW FOR "ACCELLERATE" POINTS AFT. I DO NOT BELIEVE THE BACKWARDS SWITCH CAUSED THE FAILURE, AS THE UNIT WAS SHAKEN IN BOTH DIRECTIONS TO ATTEMPT TO TRIGGER. I ALSO BELIEVE PAST "SHAKE TESTS" MAY NOT HAVE DISCLOSED THE REVERSED SWITCH, AS WHEN YOU SHAKE THE UNIT IN THE IMPACT DIRECTION, THE "BACK-STROKE" IS ENOUGH TO TRIGGER AN ELT. I WILL RETAIN THE UNIT IF FURTHER INSPECTION IS REQUIRED BY THE FAA OR MFG.