Jim and I spent a lot of time going through various systems, checking them out and/or getting them working: 1. We corrected a wiring error in the wing-root roll servo connector that was causing the roll servo to be invisible to the G3X. It's now working and online. 2. We checked the Rear cockpit LED maplight, which worked. 3. We tested the APRS power at the wing connector. 4. We fabricated a four-wire extension lead for the OAT probe from the left wing connector to the fuselage, so the AHRS would initialize. 5. We checked the wiring for the G3X config module and found I'd reversed two wires. We tried to remove the 26 AWG pins from the connector, but I didn't have a suitable tool to pull these undersized high-density pins (and neither did another friend of mine.) After numerous tries, and not wanting to damage the wires or pins, I eventually decided to cut, reverse, and splice the two tiny wires inside the connector. Now the config module works great. There was one minor glitch, however. When I powered up, the PFD went away, and now the unit seems to think it's an MFD only. This will require some more configuration research. I think the config module (which was a used one) had someone else's configuration on it. I may have to wipe it clean and start over. 6. I spent over three hours working my way through numerous setup screens on the GDU 465 and GTN 650, trying to get them to talk to each other appropriately. There are a maze of RS-232, A429, Garmin Data bus, Ethernet, MAPMX, and Connex interconnects, and they all have different requirements and settings. So far, I have had limited success with this effort. Lots more work ahead. (As an example of the issues, the GTN seems to be unable to locate its internal VOR / ILS (Nav) radio. It is grayed-out on every menu and screen.) I did get the engine instrument column to appear on the screen, however.