A12 voltage - sounder voltage

[psubill78]

On my last few runs, I've gotten messages on the A12 when I go to look at downvision about low voltage.

I confirmed voltage at the connection to my fuse block between 13.4 and 14.7 variant on if on chargers or running. This is where the stock wiring of my A12 plugs in.

When I look at the maintenance/device detail, I see at low as 11 or 10 - when at the connection - it's the 13-14v.

I have an A7 also in this configuration, and see similar.

Why would the voltage at the wire connection show OK - but the displays are complaining about low voltage?

Thank you