Seems to be cranking slow. Charge the battery and then jump it also and see if it kicks off.
Have you checked voltage to the glowplugs? Have you checked the resistance of the glow plugs? I would do both.

What's the orange tubular thing in the engine compartment?

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13