* Under the hood in the fuse box: This is the most common location. The fuse box under the hood will have a diagram showing which fuse is for the horn. Look for labels like "Horn," "HORN," or a horn symbol (a stylized horn).
* Inside the vehicle, usually under the dashboard: Some models have a smaller fuse box inside the cabin. Again, consult the owner's manual or the diagram on the fuse box cover itself.
To find the correct location, you absolutely MUST consult your owner's manual. This manual will have a detailed fuse box diagram specific to your Blazer's trim level and options. The diagram will clearly show the fuse location and amperage rating. Trying to guess can be frustrating and might even damage other parts of your vehicle's electrical system.
If you don't have your owner's manual, you can often find a downloadable PDF version online by searching for "[Your Blazer's Trim Level] 1999 Owner's Manual" (e.g., "Chevy Blazer 4x4 1999 Owner's Manual"). You'll need to know the specific trim and options to find the exact match.
