· Line-X of San Antonio
as long as ive been doing these, ive never heard of a fuse, try the fusible links under the hood in the electrical center, but i dont believe there is one. you are supposed to run your own 10A fuse in your power wire to the brake controller. i install the drawtite digital brake controllers everyday at work using the supplied harness, and havent ever blown anything on a truck in 3 years. some of the harnesses are built wrong on the 2003/2004 trucks, and have to have the brake wire run directly to the white wire on pedal switch. some have to have the power wire moved in the plug... did you have power in it for sure at any point?