1987 Chevrolet/GMC Light Duty Truck Wiring Manual

Year
1987, 1988
Make
Chevrolet, GMC
Vehicle
C/K Trucks, G Vans, Light Duty Trucks, M Vans (Astro/Safari), P Forward Control, R/V Trucks, S/T Trucks, Trucks
Type
Wiring Diagrams
Models
1988 C/K; 1987 G, P, S/T, M, R/V
Publication
ST-350-87
Pages
214

A GM light duty truck wiring diagram manual covering the 1988 C/K truck and the 1987 G van, P truck, S/T truck, M van and R/V truck. It opens with a guide to the diagram format, in which each harness is drawn as a single line on an alpha-numeric grid and every wire carries its circuit number, size, color and the address of its other end, plus basic electrical circuits and wire repair. Each truck line then has its own numbered set of harness sections, listed on a contents page at its start: fuse block details, forward lamps, engine and instrument panel harnesses for each engine, and option circuits such as air conditioning, cruise control, radios, power windows and locks, and trailer wiring.

Pages 1–8 (8 pages)

Introduction: Reading the Diagrams

How to read the diagrams: wire coding by circuit number, size and color, grid addresses and splices, and worked examples tracing the cruise control power and ground circuits and troubleshooting a high beam headlamp. It also explains basic electrical circuits (series, parallel, circuit components, fusible links and fuses), the fuse block, twisted and shielded wire repair, and the special tools J-28742-A, J-22727 and J-23520-B.

What this section covers

  • Wire coding and color abbreviations
  • Grid addresses and splices
  • Tracing circuits: cruise control and headlamp examples
  • Basic electrical circuits, fusible links and fuses
  • Twisted and shielded wire repair
  • Special tools
Read from page 1
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