I'm just wrapping up my first annual and tried the ELT test yesterday. I have an ACK E-04 121.5/406MHz ELT that is about 3 years old (battery good to 2021). I installed the batteries in the audio module and the remote in January 2017, those batteries expire in March 2024. The ELT was initially armed about this time last year. I cannot recall if I tested it back then and don't have my log books nearby. Anyways, back to this test. I pressed the test/reset button and nothing happens at all. I tried again after checking the main unit behind my baggage wall. Still nothing. I checked all of the phone cord connections from the ELT to the audio module and then to the remote. I'm going to pick up a new battery for the remote and try that, but does anyone have any ideas on what could make the simple test fail? I can try turning the ELT on from the main unit while my baggage wall is down, but haven't done that yet.