Yes, if the squiggly wires between the plugs get hot, they are energized. I suppose it is possible for the wires to get hot and the plugs not work if the insulators were not in the right places, but that's not likely.
Engine was turning a little slow with the starter in my opinion but I thought the battery might be low.

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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