The factory tow package harness has the wires marked for their purpose but there is no brake wire. There is a seperate black wire in a loom by itself and is unmarked but has no power when applying the brake with the brake box installed and working. I followed it up the frame to the fuse box under the hood and there are some fuses missing but the fuse box has no fuse designation and refers me to the owners manuel. Any help will be great. Thanks.