Hard start
When it does start, does she miss on one cylinder for a few seconds?
Does it start more easily when you leave the glow plugs on for another 10 or more seconds before cranking.
Are you using the correct grade engine oil ?
I use diesel rated 15W40 for my older diesel. Other members may recommend a particular local brand.
The second place to check is the resistance of each of the glow plug, none should be open circuit, all should be less than 1ohm when cold.
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