I pulled the connection on the driver's side inner fender for the glow plugs, and tested the power to that point (a-ok, about 11.8 Volts) and then did a continuity check to each plug from the female receptacle. The receptacle has six connections arranged like the six spots on dice. 5 were between 1.1 and 0.9 Ohms. One was infinite. Is there a key so I can decode which one is the bad one? By "key" I mean, is there a means to identify which socket on the female receptacle is which glow plug. This used to be marked right on the plug/receptacle on older cars, but I could not see anything like that. Thanks, Jim

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Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)