that is the SAS link the one you need to find is on the outside of the battery and it is a small harness with a covered loose connector. the actual wire length to this harness is about 10" and it just lays loose between the battery and the frame where the other harness is. it is slightly rectangular, 6 pin, about 5/8" X 3/4" cap removed. look around you will find it. when you do, use the guide i gave you and count the flashes of the engine shaped light. in the mean time disconect the battery and see if the light clears. you should know that the light you are dealing with has no real bearing on how the truck runs, it is emission control only. \its ok to use it while its on.