As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NITE IMC HAD SUDDEN ELECTRIAL SMELL AND SMOKE IN COCKPIT. PILOT SHUT DOWN TOTAL ELECTRICAL SYSTEM SMELL AND SMOKE CLEARED. WHILE TROUBLESHOOTING FOUND INGNITION UNIT ON HEATER HAD OVERHEATED AND STARTED TO MELT DOWN CHANGED UNIT SYSTEM OPS CHECKED GOOD.