On the 123 loop style systems, you can use the original relay and just swap in pencil plugs. Remove the ground wire. Use the hot wire from the glow strip fuse box on the firewall to the last glowplug and then run jumper wires to each successive plug. Operate the system the same way the loop system operated.
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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
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