Hey guys, I've had this issue since I bought the truck, but the IOD fuse keeps blowing and I don't know why. I do know that this fuse runs the OBDII port and several lights. I have checked all of the light connections and nothing seems to be shorting out. Can anyone throw out some more advice on why this fuse would be blowing?

The IOD covers a lot of stuff in the cab. I would get the FSM from the downloads section and start chasing wires.  

Fuse #12... Take notice all the IOD wiring is Pink.

 

So one of these is shorted or grounded out? Thanks for the diagram. I will try and trace these wires to see if I can find my issue.

more than likely.   

Does anyone know where everything plugs into the junction block? For example, if an interior light was shorting, could I unplug it directly from the junction block to resolve my issue? If so, does anyone know what the pins are for everything?