OWNER WAS DRIVING CAR WAS INFORMED THAT TAIL LIGHTS WERE NOT WORKING BY ANOTHER MOTORIST. STOPPED AT SHOP. REPAIR SHOP UNPLUGGED LIGHT HARNESS AND CUSTOMER LEFT THEN APPROXIMATELY 20 MINS. LATER SMOKE AND FIRE WAS NOTICED COMING OUT OF THE LEFT REAR TRUNK AREA AT LOCATION OF WIRING HARNESS AREA. THIS IS THE SECOND WIRING HARNESS TRUNK FIRE THIS INVESTIGATOR HAS INVESTIGATED ON A CHEVY MALIBU IN THE LAST 6 MONTHS. A SECOND FIRE WAS INVESTIGATED WITH THE SAME SCENARIO ON A 2006 CHEVY MALIBU THAT OCCURRED ON 8-11-2014. *TR