I have just got a new Modern Security Systems bell box, made by Elmdene, dated 1992, however when power is applied, both sirens will sound very quietly, not at full power t all. Is this a problem with the bell box, or the wiring? I just put 12V into the Hold Off and it started sounding very quietly. Does anyone know if this has SAB/SCB functionality, or is it just SAB? If it is SCB, i know that it is the batteries that are the problem, I just need to change it back to SAB somehow, if this is the case.
Thanks In Advance