Hello I am new to the forum and I am seeking help with my 2019 Ford E450 cutaway RV chassis. I have a blank below my vent register for an accessory and I’m looking to add a USB 12 V power supply I want to use the space as well as the wire and connector I found behind it. Does anyone know what this is? would it be OK to tap off if there’s 12 V coming out of it? See below photos.

Upside down sorry.

Back of the blank area plug is in a blank holder

This is the connector. Thanks