F 250 2WD Pickup V8-7.3L DSL (1990)
Glow Plug Control Module: Description and Operation
Glow Plug Control System
The solid-state glow plug system consists of glow plugs, the glow plug harness assembly and the glow plug controller.
The system determines the glow plug temperature by electronically measuring the resistance of the glow plugs. It then maintains this temperature
regardless of ambient temperatures.
The system is actuated when the ignition switch is turned to the RUN position. The "WAIT TO START" lamp lights until the glow plugs reach the
proper temperature. The lamp goes out and engine can be started.
The after-glow operation of the glow plugs continues after "WAIT TO START" lamp turns off. The glow plugs cycle on and off for a period of time.
This helps to reduce white smoke after engine start-up.
The glow plug system can be recycled by turning the ignition off and on. This immediately restarts the glow plug cycle. The engine can be started as
soon as the "WAIT TO START" lamp goes off.
