Since I installed dual SureFly ignition in my airplane, having a fully electronic ignition means being thoughtful and deliberate about how those magnetos get their power. Speficially, one needs a backup battery and a means to control how that battery is connected to the ignition and the main bus. After designing and installing my backup battery system and realizing it has a lot more capacity than necessary for the SureFly, I connected my AHRS and left EFIS to the backup battery (shown towards the bottom of that post). I did so through a locking DPDT panel switch that lets me disconnect the left EFIS from the both sources of power (primary and backup) simultaneously.
I decided to do something similar for the right EFIS. I connected it to the backup battery also but instead, used a DP3T switch so I have the following three switch functions: 1) OFF, 2) primary only and 3) backup and primary. For that switch, I used a NKK Switches M2044LL1W01-C to match the switch I have for the left EFIS. Here is that switch newly installed on my panel.
Here is the pinout and connection information for the new switch.
Here the switch for the left EFIS, which I added when I swapped over to fully electronic ignition and installed the backup battery.
These switches are really most useful for when I need to update the EFIS databases. I no longer need to switch on the entire panel.
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