Vehicle electrical circuits are safeguarded by fuses, circuit breakers, and fusible links. The main fuse/relay panel, the Totally Integrated Power Module (TIPM), is in the engine compartment. Different fuse sizes are used, with small ones needing pliers or a fuse-puller. To check for a blown fuse, use a test light on the terminal tips. If power is only on one side, the fuse is blown. Replace with the correct type and rating. If a new fuse fails, don't replace it or use a larger one as it can cause damage. Fusible links are used in high current circuits, melting if the circuit exceeds its limit. Replace a blown link with the same specification.