Chris the photo shows the distribution board installed,
The red and black wires with the cable ident number 2 & 3 are the power feed to the speed controller.
The radios plug is the 5volt power take of , which will be connected to the 8way switch unit. This will be used to switch items like radar, light, hello and other low voltage / amp items.
The red and blue wires with out cable idents are the feed from the two battery’s.
The two pins below these connections is the remote switch connection. This must be connected to allow the dist unit to work.
Hope this helps ?