* Near the starter: This is a common location. Look at the heavy gauge wires leading to the starter motor itself; the fusible link might be incorporated into one of those wires or be a separate link nearby.
* In the engine compartment fuse box: Some models integrated the fusible link into the fuse box.
* On the chassis near the battery: A less common location, but possible.
To find it: You'll need to trace the heavy gauge wire from the battery positive (+) terminal to the starter motor. The fusible link will be somewhere along that circuit. It's usually a short length of thinner gauge wire that's designed to melt in case of a short circuit. It may be easily identifiable as a slightly different color wire than the rest.
Without a wiring diagram specific to your truck: Finding the fusible link will require some careful investigation. Be cautious while working around the battery and electrical components to avoid shorts or injury. A wiring diagram is highly recommended to avoid damaging other parts of your vehicle's electrical system. You can find these diagrams online through sites specializing in classic car parts and manuals or at a local auto parts store. They may require you to provide the VIN number for accuracy.