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Thanks for your advice, I'll recheck again, then get into the wiring if The problem persists. I'll let you know. Chris

I have connectd the two wires, serial and ground to the 327. Set the 327 to Icarus and the D10A to format 4. The 327 still reads Pressure Altitude -----. Even took a flight and called the tower to confirm...no mode 'C'...mode 'A' works fine. I read that maybe the ground should be disconnected...