Buick 12004008 Fuse Assembly, Dash Wiring Harness Fuse Block

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To determine if a fuse is blown, remove it from the fuse block and examine the fuse element for a break.

If an electrical component fails, always check the fuse first.

The electrical circuits of the vehicle are protected by a combination of fuses, circuit breakers, and fusible links.

There are different sizes of fuses, including small, medium, and large, all with the same blade terminal design. The medium and large fuses can be removed by hand, but the small fuses require pliers or a fuse-puller tool.

The fuse block is located under the instrument panel on the left side of the dashboard. Each fuse is designed to protect a specific circuit, and the circuits are identified on the fuse panel itself. A blown fuse can be identified by inspecting the element inside the glass tube. If the metal element is broken, the fuse is inoperable and must be replaced. The easiest way to check fuses is with a test light, checking for power at each end. Be sure to replace blown fuses with the correct type and rating. If a replacement fuse immediately fails, the cause of the problem should be isolated and corrected. Some circuits are protected by fusible links, which are smaller than the wire they protect. Fusible links cannot be repaired, but a new link can be installed. Circuit breakers protect components like power windows and headlights, and some are located in the fuse box. Some circuit breakers reset automatically, while others must be reset manually.