To find it, you'll need to:
1. Locate the positive (+) battery cable: This is the thick red cable connected to your battery's positive terminal.
2. Trace the cable: Follow the positive cable from the battery. Look closely along its path for a section of thinner wire, possibly different in color or slightly darker than the rest of the cable. This may be wrapped or bundled with other wires.
3. Check near the starter: The fusible link is often found near the starter motor, or within a few inches of the battery.
Important Note: It may not look like a traditional fuse. It might be hard to visually distinguish it from the rest of the wiring unless it's already failed (melted or broken). If you're unsure, it's best to consult a Buick LeSabre repair manual specific to your year and model. A wiring diagram will greatly help.
Be extremely careful when working around your car's battery and electrical system. Disconnect the negative (-) battery terminal before starting any work to avoid electrical shocks or short circuits.