Shaymus1968

I have an 04 Silverado LS Z71 extended cab. The truck has been down for 6 yrs and I'm just not trying to get it going again. Behind the fuse block left of the brake pedal, a mouse chewed some of the wires. I fixed all but one, a light blue wire, single by itself ( not zip tied or taped to any other wires. A schematic says it goes to the 4 wheel drive which I believe to be correct, because none of the lights are working on the buttons. A multi meter shows 12 volts on the wire. I have no clue a to where it goes. Can someone please point me in the right direction to where it goes so I can repair it.