aux socket for solar, wiring diag

[vandal_sk]

Hello,

I need help with an installation.

I have an Alu-Cab tent on the roof that's powered by a connector on the roof. I've added a solar panel to the tent, and I need to route it to the battery area.
I want to split the EXT3 socket.
I want to use the existing connectors on the roof, but they are all connected together. I need to find the junction where they are connected and separate them.

Does anyone know where this junction is located in the roof?

 

[Mohs 9]

Why not using Ext2 instead? Something like this:

 

[vandal_sk]

Why not using Ext2 instead? Something like this:
View attachment 7869053

The Ext 2 socket is for the LED panel, so I'm looking for a solution to split Ext 3 into separate circuits.