The piper master connects the low side of the master solenoid winding to
ground. If you wired the clock to the 'high' side of the master switch, you
are powering the clock thorugh the master solenoid winding when the master
switch is off, and turning off the power to the clock (grounding the V+ clock
input) when the master is 'pn'. The clock must have a capacitor that keeps
it alive for about 15 sec after power is gone. Try hooking it up to a 12
battery, then removing power. I bet it stays on for 15 sec.

Jon Woellhaf wrote:

Jay wrote, "Apparently the Piper master switch -- on the hot side only --
"powers down" after 15 seconds! Some solenoid somewhere gets thrown,
grounding the circuit and killing power to the hot side of the master
switch."

What?! I'd love to see a diagram of that circuit.

Jon

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