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Probably failure of the glow plugs. Connect a meter between the glow plug feed and earth, switch the ignition to the glow plug position with the meter set to read 12 volts and see what happens. You should have a reading of 10-11 volts for about 15 seconds, no voltage fault in the supply circuit, 12 volts or there about you have one or more glow plugs that have failed.
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