Power input for EFIS-D10A

[16FW]

I see this in the manual:

Pin 15 - External Backup Power (Not wired in Dynon harness)
Will operate the EFIS-D10A only if Master Power is not present. The transition from Master Power to External Backup Power will bring up a warning, requiring you to press ACK within 30 seconds to keep the unit operating. This warning will also display when transitioning from either Master or External Backup to Internal Battery power.

I have two engines, two alternators, two batteries, and two busses. Could I connect this to one of the busses, in case the primary bus goes out? Why doesn't the Dynon harness have a wire for this, or am I missing something?

 

[dynonsupport]

Yes, you could connect this to a second bus.

We don't include a wire because less than 1% of our customers use this function, as the internal battery option is generally a sufficient backup. You are welcome to put a wire on that pin and use it if you wish.

 

[16FW]

Yes, you could connect this to a second bus.

We don't include a wire because less than 1% of our customers use this function, as the internal battery option is generally a sufficient backup. You are welcome to put a wire on that pin and use it if you wish.

Thanks!