Have you looked at the preamp's manual? It appears the 12v trigger has an adjustable delay. Did you wait long enough for it to activate?
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I see the delay option but it is only 5 seconds. I did have a chance to call PS Audio. They claim the preamp puts out 40 mA through the 12v trigger. The Niles AC-3 switch apparently requires 100mA to be activated. If that is true, it would explain why it doesn't work. Furman has a electronic relay that they say will work. I will check into that.