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usually when this happens the glow plug/s are shorted and need to be replaced.
When shorted the length of on time is a lot shorter since there is a higher amp draw, the glow plug control thinks they are hot enough
and cycle off.
Replace glow plugs, its straight forward job, remove wires and unscrew plug,,use never seize on new plug threads before installing new ones so they never seize in head and break when trying to remove.