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Wiring diagram for 1996 7.3L diesel glow plug control system wit…

Glow Plug Lamp Control
The glow plug lamp (WAIT TO START) is located on the instrument panel and is controlled by the PCM. This lamp is used to indicate when to start the engine. The PCM energizes the glow plug lamp longer if the engine is very cold or if the barometric pressure is low.

The glow plug lamp is controlled by the following sequence:
PCM lights the WAIT TO START lamp after a key on reset occurs.
PCM determines the glow plug lamp activation time based on engine oil temperature, barometric pressure and battery voltage.
PCM turns off the WAIT TO START lamp when the timer counts to the number of seconds specified by the PCM. The glow plugs will normally remain on longer than the WAIT TO START lamp.

See also:
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