The electrical circuits of the vehicle are protected by a combination of fuses, circuit breakers, and fusible links, with fuse blocks located under the instrument panel on the left side of the dashboard and in the engine compartment, including a second engine compartment fuse box for 2007 and later models. Power can be checked at the exposed terminal tips of each fuse; if power is present at one side but not the other, the fuse is blown, which can also be identified by visual inspection as the element between the terminals melts. It is essential to replace blown fuses with the correct type, as fuses of different ratings are physically interchangeable, but only the proper rating should be used to ensure each electrical circuit receives the specific amount of protection needed, with the amperage value molded into the fuse body. If a replacement fuse immediately fails, it should not be replaced again until the underlying issue, often a short circuit caused by a broken or deteriorated wire, is isolated and corrected. Some circuits, such as the ignition circuit, are protected by fusible links, which are located in the engine compartment fuse block next to the battery and are larger than standard fuses. To replace a fusible link, the negative cable from the battery must first be disconnected, followed by unplugging the burned-out link and replacing it with a new one, while also determining the cause of the overload that melted the original link before installation.