Today I pulled down my overhead console, It hasn't worked since I got the truck & I wanted to know why. I found 3 wiring harnesses up there, one large to the computer, the other to the lights &the 3rd one dangling loose. I can't see where this thing plugs in anywhere, is the plug for clearance lamps (an option I don't have yet) or is the reason my computer display won't light up?

 

Well if it won't plug into the OH console, it's not the reason the OH lights don't work. What is color and gauge of the three wires? Is this a 99.75 or a 01.25? Suggest a FSM.