Each set of 3 gray wires are going to a small board for atomizers, and there are 4 atomizers so 4 sets of 3 wires. Going from top right to left on the wires in the photo; wire one is 12v, wire 2 is ground, and wire 3 is vr. The pair of two red and black wires are for an ir led. The next set of 2 wires are red and black and they are both for 12 volt fans. The last pair of two red and black wires go to a water pump. The wires on the side from the top down; the first pair of 2 are for a float valve and the last set of 3 wires on the side are for a humidistat. Hopefully that helps even though it is not a diagram. Thank you.