What was found
(CAN) PILOT REPORTED SMOKE IN CABIN WHEN BATTERY MASTER WAS TURNED ON. ODOR WAS CONFIRMED BY MAINTENANCE. ALL ELECTRICAL INSTRUMENTS, INDICATORS & AVIONICS WERE INSPECTED ON THE CAPTAINS SIDE. GLARESHIELD AND CAPTAINS SEAT WERE REMOVED AND WIRING INSPECTED. NO DEFECTS WERE FOUND. AIRCRAFT WAS REASSEMBLED AND GROUND CHECKS CARRIED OUT WITH NO FAULTS PRESENT. AIRCRAFT RETURNED TO SERVICE AND NO ADDITIONAL DEFECTS HAVE BEEN REPORTED TO DATE IN REGARDS TO THIS INCIDENT.