Oh. It sound as if your system is wired in series with the temperature sensor. I would guess that is the ground and it needs to be removed. There needs to be one hot wire going to the first plug, a jumper wire going to each one and no more wires attached to them.

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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