Feedback. I removed the cowl panel and there was the speaker! Removed it, battled like !Removed! to open it, screws holding it together seriously rusted, eventually drilled them out, accessed the battery, tested 9v but amp test, poor compared to the new one I bought to install. Swopped over, closed up the speaker with silicon and cable ties (couldn't replace screws, my drilling had messed up the holes). Got a spook when the siren sounded full blast - tried the remote, no joy. Eventual[y realised the main car battery was still disconnected, re-connected that and all good. I've made 3 trips so far and all quiet. Hoping it stays that way.