Complete 73-87 Wiring Diagrams

[Captkaos]

Here are the complete wiring harness schematics for the 73-87 series pickups.  These are HUGE jpgs so you may want to save them to your hard drive and print the pages you need.

73-76 diagrams
73-76 cab Interior
73-76 chassis rear Lighting (chassis/cab and Stepside
73-76 chassis rear Lighting (Fleetside and Suburban
73-76 engine and Front Lighting
73-76 Firewall Junction
73-76 Instrument Cluster

77-80
77-80 250 I6 Engine wiring and front lighting
77-80 292 I6 and BBC Engine wiring
77-80 SBC Engine wiring
77-80 Cab Interior
77-80 Chassis and Rear Lighting
77-80 Intrument Panel Page 1
77-80 Intrument Panel Page 2

81-87
81-87 Cab Interior Page 1
81-87 Cab Interior Page 2
81-87 Chassis and rear Lighting
81-87 Front Lighting
81-87 I6 Engine Compartment
81-87 V8 Engine Compartment
81-87 Instrument Panel Page 1
81-87 Instrument Panel Page 2
81-87 computer control wiring

power windows wiring

Link to 1973-87(91) Factory GM Service and Wiring Manuals