The protection of the electrical circuit is provided by fuses, circuit breakers, and fusible links Most of the fuses and relays are mounted in the engine compartment on the main fuse/relay panel while others are located inside the passenger compartment on the interior fuse/relay panel. Every fuse is designed to guard a unique circuit; nevertheless, various sizes including small, medium, and large are usually used, but the blade terminal is constant. Whereas medium and large fuses can be pulled out physically, small fuses have to be pulled out a tool like a pair of plier or a plastic fuse pulling tool. Whenever you have an electrical component that is not working, the fuse should be checked by using a test light on the terminal tips; if one side has power only the fuse is blown and this is easily determined since the element between the terminals is melted. Blown fuses should be replaced with the right types and should not be replaced with fuses of different ratings even if they are physically compatible with the slot; every circuit needs a certain measure of protection provided by the amperage value inscribed on the neck of the fuse. A new fuse that blinks should then not be replaced again until the real problem that commonly is a short circuit as a result of faulty wiring is fixed. Also used are large, high amperage fuses utilized in the place of fusible links which are located in the under-hood fuse/relay block.