A combination of fuses, circuit breakers, and fusible links protect the vehicle electrical circuits, with the main fuse/relay panel being in the right-front of the engine compartment and the interior fuse/relay panel being at the left end of the instrument panel under a cover. Several different sizes of fuses are used, such as small, medium, and large, with the same design of the blade terminal, where medium and large fuses can be removed by hand but small fuses would need pliers or a fuse-puller tool of plastic. In case an electrical component fails, it is necessary to verify the fuse first with a test light to check power at the terminal ends, a broken fuse may be visibly identified by the fact that the element between the terminals is melting. It is essential to ensure that blown fuses are replaced with the appropriate type of fuse since fuses with varying ratings though may physically fit in the right fuse, are not recommended because of the particular protection requirement of any circuit. When a replacement fuse blows instantly, the cause of this problem, usually a short circuit caused by damaged wiring, should be solved before additional replacements. At least one system has switched to non- replaceable internal fuse systems or computer controlled amperage analysis where the computer will shut down the system in case the amperage goes above safe levels until the next key cycle. The use of high amperage circuits, as are found in the underhood fuse/relay box, should be carefully replaced with the same kind of fuse, and problems reoccurring on these circuits ought to be troubleshot prior to a replacement being made.