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Thank you - I can confirm +12v between A & D. In an alarm condition the voltage between B & D is +12V Connections on J6 from my manual (G3+) are: strobe + and - (12v present) T & A (SCB) D & B (bell) It looks as if I do have a faulty sounder - do you agree :?:

Following a false alarm (siren only) on my G3+ system, now neither the siren or the strobe work. I have checked out the system using the alarm and walk tests in the installation manual and all tests are OK except those for the strobe and siren. The siren/strobe fuse (F5) is OK and the strobe...