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OK – I replaced the X10 Ademco transformer with the standard, and reprogramed my “triggers” for Stay mode to point to output 17 (pin 1) in Figure 13. When I “Arm” the alarn in stay mode and I have my meter on pins 1 and 4 (output 17 and GND), I see the voltage jump from approx 17-19 down to next to nothing 0-0.5. and it reverts when I disarm the alarm. Does that help?