What was found
AT 3000FT AND CRUISE, PILOT AND CTR CONSOLE LIGHTS WENT OUT. WEATHER WAS CAVU WITH A HALF MOON. USED MAP LIGHT FOR ILLUMINATION AND RETURNED TO HOME BASE. ON SHORT FINAL WE SMELLED ELECTRICAL FUMES BUT NO INDICATION OF SMOKE. AMM AND VOLT METERS WERE NORMAL. TECH WAS PAGED AND REPAIRS MADE. A FAULTY INTENSITY CONTROL BOX WAS DETECTED. TROUBLESHOOT PILOT INSTRUMENT LIGHT SYS AND SUSPECT INTENSITY CONTROL TO BE FAULTY. CONFIRMED BY SWAPPING WITH CO-PILOT INTENSITY CONTROL (SAME PN) AND CONFIRMED. MEL'D CO-PILOT INSTRUMENT LIGHT SYS, CONTROL NR 5674C (CO-PILOT INSTRUMENT LIGHTS MAY BE INOPERATIVE FOR SINGLE PILOT OPERATIONS). MADE APPROPRIATE LOGBOOK ENTRIES AND ACFT RETURNED TO SERVICE.