GM Service Manual Online
For 1990-2009 cars only

Reference on Schematic

Section Number - Subsection Name

Engine Controls - 7.2L (Caterpillar) Schematics Cell 21

6 --Engine Controls - 7.2L (Caterpillar)

Ground Distribution Schematics Cell 14

8 -- Wiring Systems

Power Distribution Schematics Cell 10

8 -- Wiring Systems