Hydraulic For 1979 GMC Light Duty Truck (Series 10-35) Wiring Diagram

Here is the hydraulic circuit diagram of the 1979 GMC Light Duty Truck (Series 10-35). This is a quite complex schematic, you might need some time to study and understand them before you can manage to pull any wiring work in your truck. Some of the components you will come across here are including: vacuum modulator and valve, manual low control valve, governor, pressure regulator, pump, detent pressure regulator, etc. (Click image to enlarge)

 Hydraulic Circuit Diagram For 1979 GMC Light Duty Truck (Series 10 35)