Seatalk Fail / SmartPilot

[tondelayo_29]

This is good information and verifies most of the steps I have taken have been correct. I will back track and do a better job with the isolation to see if I can narrow it down or find any change.
I have not yet performed the Fluxgate Compass ohm Test or the Power Checks on the main board. Can you tell me what the voltage reading should be at the terminal on the blue fluxgate connection. The red green & yellow test out at around 4.5V if I remember correctly and the blue is negligible.
Once I have verified all of this I will probably seek return for mfg service