Hello I trying to swap a 3.0l in my 1992 p body 4 doors. The wirring come from an other 1992 P body v6. The problem is a wire is completely burn. All the rubber on it is melted out. This is the wire on the pin out 12 !! What is the purpose of this wire ? And I would like to know what is the purpose of the big 20a yellow fuse on the wirring harness near the fire wall inside the car ?