What was found
PILOT REPORTED LOSS OF HALF OF AVIONICS BUSS, INCLUDING ONE NAV/COM AND GPS AND SMOKE AND A BAD ODOR IN THE COCKPIT. WIRE NR 2H1002 (22 GAUGE) BURNED FROM THE NAV. LIGHT C/B SWITCH TO PIN 11 OF THE JC001 CONNECTOR AND FROM PC001, PIN 11 TO JV001, PIN 1. THE RED LEAD FROM THE TAIL NAV LIGHT ASSEMBLY SHORTED OUT TO A NUT-PLATE ON THE RUDDER THAT HOLDS THE RUDDER TIP ON, BUT DOES NOT DISPLAY EVIDENCE OF OVERHEATING, OTHER THAT THE PINHEAD SIZED BURN MARK.