Feed two power rated wires through the lower hole unconnected to any previously referred to wires.

Feed the female end of the battery amphenol connector through the upper hole.

Add male crimp connectors to the ends of the power rated wires and the battery amphenol connector wires that are inside the battery box.

Plug in the purple battery wires to the switch

Plug in the amphenol battery wires to the switch.

Take two more short power rated wires and add male crimps to both ends of the wires. One wire will connect to the ground of a battery and the other the power of the battery. Place a fuse in the center of the power wire.

Plug one side of the doubly male crimped wires into the switch.