I have 3 set of white and black wires encased in a red protective cover. 1 from the firewall and 2 go under the cab. All of the black wires have been sliced with 20 amp blade links and they connect to the terminal on the distribution block. The positive cable attaches to the same terminal.

One of the white wires from under the cab is spliced into a ground. The other 2 white wires are spliced to each other. All three of the blade links have power, when key is on, per my test light. I did not find any other fusible links.