As the primary mode of transportation, automobiles may develop electrical system failures during prolonged use that impair the proper functioning of electronic components. These malfunctions manifest in diverse forms with varied root causes, making the selection of appropriate diagnostic techniques and repair methodologies crucial. This article examines common electrical system failures, outlines diagnostic strategies, and proposes practical maintenance solutions to enhance repair efficiency and quality. The study provides actionable frameworks for implementing effective fault diagnosis and repair practices in automotive engineering.