Power circuits of a vehicle are protected by fuses, circuit breakers, snow chains or fusible links; the main fuse/relay panel of a vehicle is situated in the engine compartment; the interior fuse/relay panel can be under instrument panel, the rear seats, or inside a trunk near battery. It will be seen that both types of fuses are alike in that they have an associated small blade terminal which is of medium and large fuses are easily withdrawable by hand while the fuses of the smaller type require the use of pliers or a plastic 'fuse-puller'. If an electrical component is faulty, then to ascertain whether the problem is with the fuse, one has to use the test light to check for power at the terminal ends; if power is present at one end but not at the other end, then the fuse is fused or one can physically see whether the element is fused, particularly if it is made of metal and has melted. In particular, it is necessary to put the new fuses of the correct type of a certain rate into the circuit since the usage of other fuses can cause improper protection of the circuit. In case a replaced fuse blows off immediately, the problem that led to a fault should be rooted and may, in most circumstances, be a short circuit as an indication of worsening wiring. In the same way, some circuits have fusible links to protect them from high current and these elements are themselves conductors used where high currents are present and which melt when the current is too high. In case a fusible link is blown, it should be replaced with one of similar specification; if it blows once again there is a problem with the circuit and new link should not be used.