Fusible Links
WARNING: This page does not describe the selected car, but rather 18 other vehicles, including the 2004 GMC Savana Special, 2004 GMC Savana Camper Special, 2004 GMC Savana, 2004 Chevrolet RV Cutaway, and 2004 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
Fusible links are usually located between battery and starter or electrical center. For description and repair procedures, see Fig 1.