Soem trucks already have the fuses and relays installed ,soem don't . Yours does . All you have is the harness ... Remove the knee panel and look UP, & to the right . You will see a whole in the metal frame with the matching end of the harness sittign there looking at you . It is hard to get plugged in to on the angle it is on . It is atached to the metal . Stick a screw driver under it and pry it up a little . Then you can plug it in easier with one hand !
Like Buck said , the digital brake controls are easier to set up , but I replace LOTS of them ever month as they burn up easier on bigger trialers with more draw . The Tecomshes (sp) I have only had about 2-3 bad out of about 3000--4000 ..... They hand big loads better ,but are touchy to first set up right . Most of what I instal is the #9030 which handles up to 4 axles with no problem . The prodigy (from the same company )is supposed to be the best .... I am not sure about that ,but they are pretty nice unit . I have one in my Kenworth . Most people are too cheap to try one . You can buy controllers from $19 - $150 .
Cheaper is ALWAYS better !