2000 GMC Seira 2500 6.0 Underhood Fuse Box Diagram 2000 GMC Seira 2500 6.0 Underhood Fuse Box Diagram 2000 GMC Seira 2500 6.0 Underhood Fuse Box Map Fuse Panel Layout Diagram Parts: UBEC bracket, engine harness, underhood bussed electrical center.