The wiring diagrams for the AU ute are here
http://fordforums.com.au/wsm/wire/aubx/Part%2024-5.html section 24-5-54
Looks like it may be fused through both the courtesy light and Instrument cluster/Ignition fuses so check fuse 1 and fuse 11.
Also check relay 3, the EEC/
PCM relay, in the engine compartment fuse box.