the wires go behind the edge of the inner panel, over the drivers door and down the drivers A pillar to the switch - if you can get past the headliner with a hooked piece of stiff wire you may be able to fish the original wires out ... the white wire goes to the gr(oun)d terminal of the light switch, the orange goes to the D(ome) terminal and is hot all the time, turning the knob gives the ground to the socket, which should be insulated from the cab/light base at the light .... as to the black wire with white runner, the light socket on yours may have been changed at some time as indicated by the splice tape
Bill
