Yes i have verified all the wiring under the dash. This truck did have a lot of corrosion on the plugs ( Ign Switch, Trans Power-soft Switch and light switch) I have checked all the plugs the rest seem to be fine brand new wiring harness because we were told that was a known issue from several cat dealers truck has a build date of 1-21-08. Before we changed the wiring harness couldn't get an OBD2 to even turn on Cat dealer tried to hook up the lap top with the same outcome no com. That tells me we are getting there just cant figure out why I cant get communication