Emblemdhc

Dear team During aircraft power up I noticed ELT buzzer sound in the tail cone so I checked ELT  for activation but it is not activated (No LED indication ) on external remote switch and ELT  So we turned off the battery and buzzer Sound stop   Now again power up aircraft so now I access the ELT and disconnect molex connector on ELT and buzzer sound stop 
Now remove the ELT and refer Aircraft wiring manual  buzzer power is provide by ELT Now we check voltage on ELT on PIN NO. 2&4 showing 12 VDC
First thing is clear ELT is Faulty 
Now second thing is why buzzer is activate during aircraft power on
Aircraft only provide 28 VDC for remote switch LED (on indication)