1998 GMC Seira 2500 4×4 6.0 Fuse Box Diagram 1998 GMC Seira 2500 4×4 6.0 Fuse Box Diagram 1998 GMC Seira 2500 4×4 6.0 Fuse Box Map Fuse Panel Layout Diagram Parts: underhood bussed electrical center, UBEC bracket, engine harness.