1999 Buick Park Avenue electrical system problems

When starting vehicle there was aloud bang, vehicle would not start. Consumer saw smoke coming from under the hood, then flames. Dealer could not determine cause of fire. Fire department stated computer was the cause. Vehicle has extensive damage.

When I turned on the left turn, the lamp on the instrument panel had stopped blinking and stayed on, even when the switch was in the neutral position. Right-turn worked fine. The next day I could not start my car, the battery was completely dead. I was late for an important meeting. Later I found out that when the engine is off and the key removed from the ignition, all the lights on the left side of the car continued to burn, and that was the cause battery discharge.