Continued work on wiring spreadsheet and wiring design. Discussed TCW IBBS connections and function with TCW tech support. Discussed how modern avionics and TCW, in their opinion, obviates (new word of the day!) the need for the endurance bus. Decided to change my approach to match the TCW recommended approach which is also shown in the Garmin install manual.

Looking at how many switches I have on the panel and how many I can combine...