APU Tri-pac not charging batteries

The 2022 Freightliner Cascadia has a receptacle below the bunk bed. This receptacle is connected to the APU. The APU has built-in 6000 watt generator. It is used for Cooking Appliances or higher watts appliances. For extra outlets from the two blow the bed just plug in a power bar.The other receptacles or 12 voltage power plugs are designed for lower wattage use.

 

Do you have a picture of it?

 

Since the battery, ground and fuses are good I’m wondering it’s the sensor or board.. I checked the board and it had green flashing lights and around 12.4v only on ONE of 6 pins from the white connector
I’m wondering if replacing this sensor will do it