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PHINNROS

I am trying to figure out why I am getting a NO PILOT and SEATALK FAILURE message in testing a system. The PO had the system working when he took it off the boat. I have checked and double checked the seatalk cable, it is good. I can hear the relay click when power is switched on and the ST7001 gives me the error messages. Voltage is good, 12.6 or more. I even took both units apart hoping to find a broken connection or a bit of corrosion, nope, nothing obvious and I even put an ohm meter on a few of the circuit board ribbons that I though looked different. . So, is there a way to check to see if seatalk is being sent out from the computer? I would like to be able to find at least if it is the computer or the control head. I am trying to find another boat I can test the control head on to see if it is good.