Spent about 2 hours studying wiring harnesses supplied by GRT to connect the EFIS, EIS, SafeFly GPS, and uAvionix ADS-B device.
Found some discrepancies between the supplied harnesses and manuals, and conflicting information between different manuals for the different systems, even wthin GRT....
Wrote email to GRT for clarification, but in general feel better comprehension of the overall system has been reached.