Glow plug light in cab do not light up and engin do not start

find books down under,
none here USA>
contact HOLDEN maker directly.

step 1 is always check all fuses(cab and engine bay)
ahhhhhhh 6.0L diesel engine not GAS.(petrol)
bad fuel> , lost pump prime diesel , bad pumps>
scan the PCM is next see glow plug errors?
"Is DTC P0670, P0671, P0672, P0673, P0674, P0675, P0676, P0677, P0678, or P0683 present?" FSM quote.

backfired to Air cleaner, end or backfired to exhaust pipe end.???
what is the blower thing/ (HVAC, CAB HEATING AND COOLING BLOWER DEAD?)
IF DASH BLOWER IS DEAD MOST TIMES THAT IS BLOWN F12 FUSE
AND IS NOT RELATED TO , the engine problems, most times
F12 battery junction box blown fuse. or worse(means scan PCM)
auto climate is F12 manual climate is f224.
know = NOW:?
engine crank okay.
but will not start, but does start with spray stating fluid but not told does it stay running or just runs for 3 second and stalls.
3 seconds is the starting fluid consumed, and normal if injectors are dead.
using too much spray invites backfiring, so don't do that.
3 seconds max spray ,crank , repeat 3 time, if runs 3 second
fuel pressure is lost or worse , means scan the PCM.
spraying real diesel oil can surely fail, if GLOW plugs are dead;
again fuses are checked first, for sure Glow plugs and BLOWER HVAC fuse.

read the glow plugs test here ,6.0L

https://eautorepair.net/Marketing/Default.asp

I voltage check fuses or ohm them in hand
some fuses can fail with super hair line cracks, not just classic blown to H3LL element. (smoke seen and metal dust there)
I test them if they look ok'ish, (looks bad is bad)

A diesel uses glow plugs to fire the fuel when it is first started. If one glow plug quits working the glow plug controler shortens the time that the rest are on. If two its even shorter. If the wait to start light goes off sooner than it used to check the glow plugs.
Glow plugs can be checked easy with a test light.
Unplug a glow plug. (located on the head by the injector).
Just hook up a test light to battery positive (+) and touch the other end to the glow plug connector. If the light lights that one is o.k. Check all 8. Replace any that dont work.
If the glow plug system is working then check for fuel leaks. If fuel can leak out than air can get sucked in the fuel system and cause a hard start.
There is also a transfer pump on the frame rail under the drivers seat. This can be a issue if it fails.
When the key is first turned on this pump will come on and prime the system. You can hear it if you get close to it.
I hope this helps you. Re-post if you need more info.

The wait to start light always comes on for at least 1 sec, if it goes off early it must think the engine is warm.

My guess is you have a faulty engine oil temp sensor that is telling the pcm that it is already warm. The only way to know for sure is to read the info with a scan tool.

Glow Plug System: Description and Operation
GLOW PLUG SYSTEM
The 6.0L diesel engine uses a glow plug system that preheats air in the combustion chamber to improve cold engine starting.
The system consists of:
- glow plugs.
- glow plug control module.
- powertrain control module (PCM).
- engine oil temperature (EOT) sensor.
- barometric pressure sensor (BARO sensor).
The glow plug monitor system is part of the On-Board Diagnostics II (OBD II) System.
The glow plug system is electronically controlled by the powertrain control module. If the oil temperature is below 55°C (131°F) the powertrain
control module will energize the glow plugs immediately after the key is placed in the ON position. Then, depending on the readings from the engine
oil temperature (EOT) sensor and the barometric pressure (BARO) sensor, the powertrain control module determines how long the glow plugs will be
on.
The glow plugs are located in the cylinder heads, under the glow plug buss bar.
The glow plugs are self-regulating. If the engine oil temperature is above 55°C (131°F), the powertrain control module will bulb-check the WAIT TO
START lamp but not energize the glow plug relay.
The glow plug ON time varies from 0-120 seconds depending on battery voltage, engine oil temperature and barometric pressure.
The glow plug control monitor (GPCM) system is designed to find failed glow plugs or failed wiring in the glow plug system.

The problem is the glow plugs are bad or not coming on. Even though the "wait to start" light comes on, the glow plugs may not come on. I have found when this happens, the light comes on for only 1-2 seconds and goes off. With the engine cold, the light should stay on for about 5 to 7 seconds. The colder the engine, the longer the plugs should stay on. There is one glow plug for each cyl. The plugs are in the "V" of the engine and screwed into head. Only one wire goes to the glow plug and the wire runs from one plug to the next on each bank. You test them by removing them and grounding the body and putting 12v positive to the terminal. The tip should glow red hot like a cigarette lighter. There is a glow plug relay behind the air intake horn which also could be the problem and there is a engine temp sensor in the circuit also.

You'll find the glow plugs where spark plugs would be in a gasoline engine (in the cylinder heads).
The glow plugs will be smaller than spark plugs and, like a light bulb, will burn out and loose electrical continuity. You can check them in place with an ohm meter:
Remove the wire attached to the positive end and mesaure resistance to gound (engine block) through the plug. Unscrew failed glow plugs and install replacements. Carefully clean around the plugs prior to removal (to prevent dirt entering the engine) and apply the correct anti-seize compound to the threads of the new plugs where they screw into the heads. Be sure the wires are well connected without any corrosion or oxidation (no resistance).
Take your time and work carefully so as to avoid breaking or cross threading plugs. Do not wash the engine with water or detergent as the injector pump is delicate.

have it scan. the pcm controls the glow plugs on and off time.by the oil temperature sensor and barometric pressure increase.

if you need connectors and terminals for the glow plug connections under the valve cover, Ford sells then so you don't need a whole $600 harness.

info for your use

Section 03-07B: Glow Plug System 1996 F-250, F-350, F-Super Duty Equipped with 7.3L Diesel Engines Workshop Manual
DESCRIPTION AND OPERATION Glow Plug System The 7.3L diesel engine uses a glow plug system which preheats air in the combustion chamber to improve cold engine starting. The system consists of eight glow plugs, the glow plug control module (12B533), powertrain control module (PCM) (12A650), engine oil temperature (EOT) sensor and barometric pressure sensor (BARO sensor) (12A644). The glow plug system is electronically controlled by the powertrain control module. The powertrain control module energizes the glow plugs immediately after the key is placed in the ON position and then determines how long the glow plugs will be on according to the engine oil temperature and the barometric pressure. The required time for the glow plugs to be energized decreases as the engine oil temperature and barometric pressure increase. The glow plugs are self-regulating, and the powertrain control module controls relay ON time. The powertrain control module protects the glow plugs by energizing them for short durations if the battery voltage is abnormally high.

Possible Causes: Insufficient glow plug ON time will not allow enough heat to accumulate in the combustion chamber to easily facilitate starting. If the glow plug system ON time does not meet any of the specifications in the accompanying chart the problem is most likely a faulty wire harness connection, ground connections or glow plug relay.

If the glow plug resistance to ground is high, the most likely causes are an open UVC (under valve cover) harness or open glow plug.
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Relay Operation
Install a DVOM on the glow plug feed side of the glow plug relay (large stud with two wires connected). Turn the ignition key to the ON position but do not attempt to start. Note the time in seconds from when the key is turned on and the glow plug relay energizes until the glow plug relay de-energizes. The glow plug relay makes a loud click noise which is easily heard when it energizes and de-energizes. The dome light will dim and the dash voltmeter will dip when the glow plugs are drawing current from the battery. Compare the times measured to the table (time will be affected by engine temperature, battery condition and vehicle altitude). The voltage at the glow plug feed terminal may vary from 9 to 12 volts depending upon battery condition.
--------------------------------------

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If battery voltage not present check for B+ at power supply terminal (terminal with single large wire). Power for glow plug power supply is supplied from starter relay through two fusible links at solenoid.
Glow Plug Operation
Disconnect all of the glow plug/injector harness connectors from the valve cover gaskets. With the pigtail installed, measure glow plug resistance to ground (preferably B-). A resistance measurement of .1 to 6 ohms indicates a good glow plug.



Glow Plug Harness Continuity
Measure for continuity from the connector harness to the glow plug feed terminal on the glow plug relay. Resistance should be less than 5 ohms.
Incorrect measurements will result if all glow plug/injector connectors to valve cover are not disconnected.

---------------------------------------------------
Glow Plug Relay The glow plug relay (12A343) has a plastic base and two mounting bolts. It is operated by the powertrain control module (PCM) (12A650) which senses engine oil temperature, PCM voltage and barometric pressure. When the engine oil temperature or the barometric pressure is low, the PCM activates the glow plug relay and the glow plugs. If the PCM voltage is too high, the powertrain control module deactivates the glow plug relay and the glow plugs immediately energize for a shorter duration, decreasing the modulation of the duty cycle.
-----------------------------------------------
Glow Plug Removal

1. WARNING: THE RED-STRIPED WIRING HARNESS CARRIES 115V DC. SEVERE ELECTRICAL SHOCK MAY BE RECEIVED. DO NOT PIERCE.
   Remove valve cover (6582). Refer to Section 03-01D .
   

1. Disconnect glow plug electrical connector using a pair of pliers.
   

1. Remove glow plug using 10mm socket.
   

1. Clean and inspect glow plug tip for damage. Replace if damaged.
   

Installation

1. Install glow plug and tighten to 19 Nm (14 lb-ft).
   

1. Connect glow plug electrical connector. Make sure glow plug wiring is routed to avoid moving parts.
   

--------------------------------------------------------------
Glow Plug Control Glow plugs are used to warm the cylinders to improve cold-engine starting. The PCM uses the engine oil temperature (EOT) sensor and barometric pressure (BARO) sensor to determine how long the glow plugs will be on. The PCM energizes the glow plugs longer if the engine is very cold or if the barometric pressure is low at high altitudes.
The PCM controls the relay that supplies power to the glow plugs with the glow plug control (GPC) signal. When the GPC signal is grounded by the PCM the relay closes, turning the glow plugs on.
The glow plugs are controlled by the following sequence:

1. PCM energizes the glow plugs.

1. The PCM energizes the glow plugs immediately after the ignition is placed in the ON position.

1. The PCM then determines how long glow plugs will be on based on EOT sensor and the BARO sensor. The required time to warm up the cylinder decreases the engine oil temperature and barometric pressure increases at low altitudes.

Glow Plug Lamp Control The glow plug lamp (GPL) signal controls the WAIT TO START light located on the instrument panel. This light is used to indicate when to start the engine. The cylinders are being warmed by the glow plugs during and after this light is lit. The PCM energizes the glow plug lamp longer if the engine is very cold or if the barometric pressure is low.
When the GPL signal is brought low, the "Wait to Start" lamp is turned on.
The glow plug lamp is controlled by the following sequence:

1. PCM lights the WAIT TO START light after a key on reset occurs.

The PCM determines the glow plug lamp activation time based on engine oil temperature, barometric pressure and battery voltage.

1. PCM turns off the WAIT TO START light.

The glow plug lamp is turned off 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.
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Check the glow plug thermo sensor...found in the cylinder head.
Unlightly anything wrong with injector pump.
Good luck
John

to check the glow plugs you can use a scanner (snap-on) or you have to take the valve covers off,take a test light n hook it up to your positive post on battery,pull wire off glow plug,take test light to glow plug if it lights its good if it doesnt the plugs bad,as for the fuel leak it may be the lift pump in the valley or it can also be the vacum switch on the fuel filter housing