Original 1988 Chevrolet Light Duty Truck Dealer Electrical Wiring Diagram Service Manual. This very informative and large Factory Manual covers C/K, G Van, S/T, R/V, P & M Van Models. These detailed Wiring Diagrams are what the Dealership used to diagnose and repair your Chevy. Very good condition with minor wear and soiling [see photos]. Very useful and rare since they were not offered to the public. ST 350-88