The technology in the automobile field has steadily developed and the number of registered automobiles has also increased explosively, and automobiles have become an essential part of our daily life. An increase in the penetration rate or frequency of use of automobiles can increase the likelihood of accidents, and automobile fires are also occurring frequently. In the case of automobile fires, 458 cases have occurred in the past three years, accounting for 12.3% of the total 3,716 fires in Daegu, and about 50% of them occur inside the engine room of a car while driving or parked. In this study, we conduct various experiments on the starter motor, which is a device that uses a large current, among various causes that occur in the engine room of a car, and prove the electrical singularity and fire potential to identify the exact cause of the fire and suggest countermeasures against the car fire.