If there's no manual primer pump in the system, it's hole would have to be plugged or there would be diesel spurting everywhere. Pictures of your IP and glow plugs would be helpful as would a video of the engine trying to start.
Pencil plugs don't have to be wired in parallel. Jumper wires from plug to plug work just fine. It's how the retrofit kits are designed.

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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