There have been two cases on this forum within the last six weeks of loop plugs being wired up incorrectly, resulting in them not working. The squiggly wires and porcelain insulators have to be in exactly the right places the get the current to flow thru the system. Do your squiggly wires get hot and glow red when the key is in the glow position. The glow should be readily visible in the dark, not so much in daylight.

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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