Right now I have the system under vaccuum. I had the vacuum pump on it for 30 minutes and then closed the valves. The system has held at 30 inHg without change, so I am looking into electrical now. I am going to try to charge the system with the pressure switch jumped to see what happens. Where is the amplifier?I've been trying to make sense of the wiring diagram Zip posted 2 years ago. If the A/C switch lamp is lighting up the circuit's getting power, and the A/C Amplifier (the controller) should be getting power. If the A/C Amplifier is faulty that might explain everything.