Pages 1–8 (8 pages)

Introduction: Reading the Diagrams

From the 1987 Chevrolet/GMC Light Duty Truck Wiring Manual

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.

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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
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

What’s inside

Wiring diagrams

  1. Introduction: Reading the Diagramspp. 1–8
  2. 1988 C/K Truck Wiring Diagramspp. 9–34
  3. 1987 G Van Wiring Diagramspp. 35–70
  4. 1987 P Truck Wiring Diagramspp. 71–96
  5. 1987 S/T Truck Wiring Diagramspp. 97–134
  6. 1987 M Van Wiring Diagramspp. 135–162
  7. 1987 R/V Truck Wiring Diagramspp. 163–214

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