I need to replace the factory wiring harness that goes through the firewall. All the wires under the hood are cut. Can anyone tell me what is the best way? I think maybe I might have to remove the complete dashboard. Any help or suggestions are needed. Pictures would be a great help also. Will the complete dash come out at once? Thanks

 

you will need to unplug the ecm , first diss connect the snaller plug by the ecm then either cut the large rubber grommit and slide it off you will need to unplug all the sensors fuel injection unit ect , o2 sensor at the y pipe , also the main power feed at the junction block right next to the esc unit dont forget to disconnect the knock sensor and ground on the back of the drivers side cylinder head and then the main bulk head right to the right of the power brake boosterbehind the washer fluid container .installation is reverse of removal, I know I just burned the whole harness in my 91' blazer engine cought fire , so just take your time and make shure everything is unpluged and dont force the harness so you dont snap anything internally
hope this helps