What was found
DURING APPROACH, THE CAPTAINS OVERHEAD LIGHT SWITCH WAS ACTUATED AND THE LIGHT DID NOT ILLUMINATED. THE CREW SUBSEQUENTLY ACTUATED THE COPILOT'S OVERHEAD LIGHT SWITCH WHICH ILLUMINATED AND WAS ACCOMPANIED BY AN ODOR OF SMOKE. THE CAPTAIN SHUTDOWN ALL ELECTRICAL SYSTEMS AND WAS ABLE TO SEE A SMALL FLAME IN THE OVERHEAD CONSOLE. AN EMERGENCY WAS DECLARED AND THE FLIGHT DIVERTED. THE FLAME SELF EXTINGUISHED PRIOR TO ARRIVAL. SUBSEQUENT INSPECTION REVEALED A RESISTOR WITHIN THE OVERHEAD DIMMER ASSEMBLY HAD FAILED AND CAUSED THE FLAME.