Cars' electrical circuits are safeguarded by fuses, circuit breakers, and fusible links, located under the dashboard. Each fuse protects a specific circuit, identified on the panel. If an electrical component fails, first check its fuse, identifiable by a broken metal element if blown. Use plastic fuse pullers for removal and installation, and ensure the correct amperage rating for each circuit. Bypassing a fuse can damage the system. If a new fuse fails immediately, locate and fix the cause, typically a short circuit, before replacement.