K 3500 Truck 4WD V8-393 6.5L DSL Turbo (1993)
Glow Plug Relay: Description and Operation
Glow Plug Circuit
Glow Plug Controller
PURPOSE
The electronic glow plug controller relay assembly monitors and controls glow plug relay operation.
OPERATION
The assembly contains the circuitry which monitors and controls glow plug relay operation. Information received at pins B and C is used by the
controller to determine glow plug operating requirements. Pin B senses voltage at the starting motor solenoid. Pin C senses glow plug voltage. the
controller also senses ambient temperature.
A normally functioning system operates as follows:
Key on - Engine not running and at room temperature.
1. Glow plugs ON for 4 to 6 seconds, then OFF for about 4.5 seconds
